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<!DOCTYPE html> <html lang="en" class="no-js"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="applicable-device" content="pc,mobile"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta name="robots" content="max-image-preview:large"> <meta name="access" content="No"> <meta name="360-site-verification" content="1268d79b5e96aecf3ff2a7dac04ad990" /> <title>ImageNet Large Scale Visual Recognition Challenge | International Journal of Computer Vision</title> <meta name="twitter:site" content="@SpringerLink"/> <meta name="twitter:card" content="summary_large_image"/> <meta name="twitter:image:alt" content="Content cover image"/> <meta name="twitter:title" content="ImageNet Large Scale Visual Recognition Challenge"/> <meta name="twitter:description" content="International Journal of Computer Vision - The ImageNet Large Scale Visual Recognition Challenge is a benchmark in object category classification and detection on hundreds of object categories and..."/> <meta name="twitter:image" content="https://static-content.springer.com/image/art%3A10.1007%2Fs11263-015-0816-y/MediaObjects/11263_2015_816_Fig1_HTML.gif"/> <meta name="journal_id" content="11263"/> <meta name="dc.title" content="ImageNet Large Scale Visual Recognition Challenge"/> <meta name="dc.source" content="International Journal of Computer Vision 2015 115:3"/> <meta name="dc.format" content="text/html"/> <meta name="dc.publisher" content="Springer"/> <meta name="dc.date" content="2015-04-11"/> <meta name="dc.type" content="OriginalPaper"/> <meta name="dc.language" content="En"/> <meta name="dc.copyright" content="2015 Springer Science+Business Media New York"/> <meta name="dc.rights" content="2015 Springer Science+Business Media New York"/> <meta name="dc.rightsAgent" content="journalpermissions@springernature.com"/> <meta name="dc.description" content="The ImageNet Large Scale Visual Recognition Challenge is a benchmark in object category classification and detection on hundreds of object categories and millions of images. The challenge has been run annually from 2010 to present, attracting participation from more than fifty institutions. This paper describes the creation of this benchmark dataset and the advances in object recognition that have been possible as a result. We discuss the challenges of collecting large-scale ground truth annotation, highlight key breakthroughs in categorical object recognition, provide a detailed analysis of the current state of the field of large-scale image classification and object detection, and compare the state-of-the-art computer vision accuracy with human accuracy. We conclude with lessons learned in the 5&nbsp;years of the challenge, and propose future directions and improvements."/> <meta name="prism.issn" content="1573-1405"/> <meta name="prism.publicationName" content="International Journal of Computer Vision"/> <meta name="prism.publicationDate" content="2015-04-11"/> <meta name="prism.volume" content="115"/> <meta name="prism.number" content="3"/> <meta name="prism.section" content="OriginalPaper"/> <meta name="prism.startingPage" content="211"/> <meta name="prism.endingPage" content="252"/> <meta name="prism.copyright" content="2015 Springer Science+Business Media New York"/> <meta name="prism.rightsAgent" content="journalpermissions@springernature.com"/> <meta name="prism.url" content="https://link.springer.com/article/10.1007/s11263-015-0816-y"/> <meta name="prism.doi" content="doi:10.1007/s11263-015-0816-y"/> <meta name="citation_pdf_url" content="https://link.springer.com/content/pdf/10.1007/s11263-015-0816-y.pdf"/> <meta name="citation_fulltext_html_url" content="https://link.springer.com/article/10.1007/s11263-015-0816-y"/> <meta name="citation_journal_title" content="International Journal of Computer Vision"/> <meta name="citation_journal_abbrev" content="Int J Comput Vis"/> <meta name="citation_publisher" content="Springer US"/> <meta name="citation_issn" content="1573-1405"/> <meta name="citation_title" content="ImageNet Large Scale Visual Recognition Challenge"/> <meta name="citation_volume" content="115"/> <meta name="citation_issue" content="3"/> <meta name="citation_publication_date" content="2015/12"/> <meta name="citation_online_date" content="2015/04/11"/> <meta name="citation_firstpage" content="211"/> <meta name="citation_lastpage" content="252"/> <meta name="citation_article_type" content="Article"/> <meta name="citation_language" content="en"/> <meta name="dc.identifier" content="doi:10.1007/s11263-015-0816-y"/> <meta name="DOI" content="10.1007/s11263-015-0816-y"/> <meta name="size" content="837900"/> <meta name="citation_doi" content="10.1007/s11263-015-0816-y"/> <meta name="citation_springer_api_url" content="http://api.springer.com/xmldata/jats?q=doi:10.1007/s11263-015-0816-y&api_key="/> <meta name="description" content="The ImageNet Large Scale Visual Recognition Challenge is a benchmark in object category classification and detection on hundreds of object categories and m"/> <meta name="dc.creator" content="Russakovsky, Olga"/> <meta name="dc.creator" content="Deng, Jia"/> <meta name="dc.creator" content="Su, Hao"/> <meta name="dc.creator" content="Krause, Jonathan"/> <meta name="dc.creator" content="Satheesh, Sanjeev"/> <meta name="dc.creator" content="Ma, Sean"/> <meta name="dc.creator" content="Huang, Zhiheng"/> <meta name="dc.creator" content="Karpathy, Andrej"/> <meta name="dc.creator" content="Khosla, Aditya"/> <meta name="dc.creator" content="Bernstein, Michael"/> <meta name="dc.creator" content="Berg, Alexander C."/> <meta name="dc.creator" content="Fei-Fei, Li"/> <meta name="dc.subject" content="Computer Imaging, Vision, Pattern Recognition and Graphics"/> <meta name="dc.subject" content="Artificial Intelligence"/> <meta name="dc.subject" content="Image Processing and Computer Vision"/> <meta name="dc.subject" content="Pattern Recognition"/> <meta name="citation_reference" content="citation_journal_title=Pattern Analysis and Machine Intelligence; citation_title=Face description with local binary patterns: Application to face recognition; citation_author=T Ahonen, A Hadid, M Pietikinen; citation_volume=28; citation_issue=14; citation_publication_date=2006; citation_pages=2037-2041; citation_doi=10.1109/TPAMI.2006.244; citation_id=CR1"/> <meta name="citation_reference" content="citation_journal_title=IEEE Transactions on Pattern Analysis and Machine Intelligence; citation_title=Measuring the objectness of image windows; citation_author=B Alexe, T Deselares, V Ferrari; citation_volume=34; citation_issue=11; citation_publication_date=2012; citation_pages=2189-2202; citation_doi=10.1109/TPAMI.2012.28; citation_id=CR2"/> <meta name="citation_reference" content="Arandjelovic, R., & Zisserman, A. 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In ECCV."/> <meta name="citation_author" content="Russakovsky, Olga"/> <meta name="citation_author_email" content="olga@cs.stanford.edu"/> <meta name="citation_author_institution" content="Stanford University, Stanford, USA"/> <meta name="citation_author" content="Deng, Jia"/> <meta name="citation_author_institution" content="University of Michigan, Ann Arbor, USA"/> <meta name="citation_author" content="Su, Hao"/> <meta name="citation_author_institution" content="Stanford University, Stanford, USA"/> <meta name="citation_author" content="Krause, Jonathan"/> <meta name="citation_author_institution" content="Stanford University, Stanford, USA"/> <meta name="citation_author" content="Satheesh, Sanjeev"/> <meta name="citation_author_institution" content="Stanford University, Stanford, USA"/> <meta name="citation_author" content="Ma, Sean"/> <meta name="citation_author_institution" content="Stanford University, Stanford, USA"/> <meta name="citation_author" content="Huang, Zhiheng"/> <meta name="citation_author_institution" content="Stanford University, Stanford, USA"/> <meta name="citation_author" content="Karpathy, Andrej"/> <meta name="citation_author_institution" content="Stanford University, Stanford, USA"/> <meta name="citation_author" content="Khosla, Aditya"/> <meta name="citation_author_institution" content="Massachusetts Institute of Technology, Cambridge, USA"/> <meta name="citation_author" content="Bernstein, Michael"/> <meta name="citation_author_institution" content="Stanford University, Stanford, USA"/> <meta name="citation_author" content="Berg, Alexander C."/> <meta name="citation_author_institution" content="UNC Chapel Hill, Chapel Hill, USA"/> <meta name="citation_author" content="Fei-Fei, Li"/> <meta name="citation_author_institution" content="Stanford University, Stanford, USA"/> <meta name="format-detection" content="telephone=no"/> <meta name="citation_cover_date" content="2015/12/01"/> <meta property="og:url" content="https://link.springer.com/article/10.1007/s11263-015-0816-y"/> <meta property="og:type" content="article"/> <meta property="og:site_name" content="SpringerLink"/> <meta property="og:title" content="ImageNet Large Scale Visual Recognition Challenge - International Journal of Computer Vision"/> <meta property="og:description" content="The ImageNet Large Scale Visual Recognition Challenge is a benchmark in object category classification and detection on hundreds of object categories and millions of images. 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The challenge has been run annually from 2010 to present, attracting participation from more than fifty institutions. This paper describes the creation of this benchmark dataset and the advances in object recognition that have been possible as a result. We discuss the challenges of collecting large-scale ground truth annotation, highlight key breakthroughs in categorical object recognition, provide a detailed analysis of the current state of the field of large-scale image classification and object detection, and compare the state-of-the-art computer vision accuracy with human accuracy. 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class="c-article-section__figure-content"><div class="c-article-section__figure-item"><picture><source type="image/webp" srcset="//media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11263-015-0816-y/MediaObjects/11263_2015_816_Fig4_HTML.gif?as=webp"><img src="//media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11263-015-0816-y/MediaObjects/11263_2015_816_Fig4_HTML.gif" alt="" loading="lazy"></picture></div></div></figure></div><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-5"><figure><figcaption><b id="Fig5" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 5</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><picture><source type="image/webp" 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class="c-article-section__figure-content"><div class="c-article-section__figure-item"><picture><source type="image/webp" srcset="//media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11263-015-0816-y/MediaObjects/11263_2015_816_Fig9_HTML.gif?as=webp"><img src="//media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11263-015-0816-y/MediaObjects/11263_2015_816_Fig9_HTML.gif" alt="" loading="lazy"></picture></div></div></figure></div><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-10"><figure><figcaption><b id="Fig10" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 10</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><picture><source type="image/webp" srcset="//media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11263-015-0816-y/MediaObjects/11263_2015_816_Fig10_HTML.gif?as=webp"><img src="//media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11263-015-0816-y/MediaObjects/11263_2015_816_Fig10_HTML.gif" alt="" loading="lazy"></picture></div></div></figure></div><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-11"><figure><figcaption><b id="Fig11" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 11</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><picture><source type="image/webp" srcset="//media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11263-015-0816-y/MediaObjects/11263_2015_816_Fig11_HTML.gif?as=webp"><img 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js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-13"><figure><figcaption><b id="Fig13" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 13</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><picture><source type="image/webp" srcset="//media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11263-015-0816-y/MediaObjects/11263_2015_816_Fig13_HTML.gif?as=webp"><img src="//media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11263-015-0816-y/MediaObjects/11263_2015_816_Fig13_HTML.gif" alt="" loading="lazy"></picture></div></div></figure></div><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-14"><figure><figcaption><b id="Fig14" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 14</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><picture><source type="image/webp" srcset="//media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11263-015-0816-y/MediaObjects/11263_2015_816_Fig14_HTML.gif?as=webp"><img src="//media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11263-015-0816-y/MediaObjects/11263_2015_816_Fig14_HTML.gif" alt="" loading="lazy"></picture></div></div></figure></div><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-15"><figure><figcaption><b id="Fig15" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 15</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><picture><source type="image/webp" 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Intelligence">Artificial Intelligence</a> </li> </ul> </section> <section data-title="Notes"><div class="c-article-section" id="notes-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="notes">Notes</h2><div class="c-article-section__content" id="notes-content"><ol class="c-article-footnote c-article-footnote--listed"><li class="c-article-footnote--listed__item" id="Fn1" data-counter="1."><div class="c-article-footnote--listed__content"><p>In this paper, we will be using the term <i>object recognition</i> broadly to encompass both <i>image classification</i> (a task requiring an algorithm to determine what object classes are present in the image) as well as <i>object detection</i> (a task requiring an algorithm to localize all objects present in the image).</p></div></li><li class="c-article-footnote--listed__item" id="Fn2" data-counter="2."><div class="c-article-footnote--listed__content"><p>In 2010, the test annotations were later released publicly; since then the test annotation have been kept hidden.</p></div></li><li class="c-article-footnote--listed__item" id="Fn3" data-counter="3."><div class="c-article-footnote--listed__content"><p>In addition, ILSVRC in 2012 also included a taster fine-grained classification task, where algorithms would classify dog photographs into one of 120 dog breeds (Khosla et al. <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 2011" title="Khosla, A., Jayadevaprakash, N., Yao, B., & Fei-Fei, L. (2011). Novel dataset for fine-grained image categorization. In First workshop on fine-grained visual categorization, CVPR." href="/article/10.1007/s11263-015-0816-y#ref-CR42" id="ref-link-section-d138070400e858">2011</a>). Fine-grained classification has evolved into its own Fine-Grained classification challenge in 2013 (Berg et al. <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 2013" title="Berg, A., Farrell, R., Khosla, A., Krause, J., Fei-Fei, L., Li, J., & Maji, S. (2013). Fine-grained competition. 
 https://sites.google.com/site/fgcomp2013/
 
 ." href="/article/10.1007/s11263-015-0816-y#ref-CR8" id="ref-link-section-d138070400e861">2013</a>), which is outside the scope of this paper.</p></div></li><li class="c-article-footnote--listed__item" id="Fn4" data-counter="4."><div class="c-article-footnote--listed__content"><p> <a href="http://www.flickr.com">www.flickr.com</a>.</p></div></li><li class="c-article-footnote--listed__item" id="Fn5" data-counter="5."><div class="c-article-footnote--listed__content"><p>Some datasets such as PASCAL VOC (Everingham et al. <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 2010" title="Everingham, M., Van Gool, L., Williams, C. K. I., Winn, J., & Zisserman, A. (2010). The Pascal Visual Object Classes (VOC) challenge. International Journal of Computer Vision, 88(2), 303–338." href="/article/10.1007/s11263-015-0816-y#ref-CR19" id="ref-link-section-d138070400e1620">2010</a>) and LabelMe (Russell et al. <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 2007" title="Russell, B., Torralba, A., Murphy, K., & Freeman, W. T. (2007). LabelMe: A database and web-based tool for image annotation. In IJCV." href="/article/10.1007/s11263-015-0816-y#ref-CR66" id="ref-link-section-d138070400e1623">2007</a>) are able to provide more detailed annotations: for example, marking individual object instances as being <i>truncated</i>. We chose not to provide this level of detail in favor of annotating more images and more object instances.</p></div></li><li class="c-article-footnote--listed__item" id="Fn6" data-counter="6."><div class="c-article-footnote--listed__content"><p>Some of the training objects are actually annotated with more detailed classes: for example, one of the 200 object classes is the category “dog,” and some training instances are annotated with the specific dog breed.</p></div></li><li class="c-article-footnote--listed__item" id="Fn7" data-counter="7."><div class="c-article-footnote--listed__content"><p>The validation/test split is consistent with ILSVRC2012: validation images of ILSVRC2012 remained in the validation set of ILSVRC2013, and ILSVRC2012 test images remained in ILSVRC2013 test set.</p></div></li><li class="c-article-footnote--listed__item" id="Fn8" data-counter="8."><div class="c-article-footnote--listed__content"><p>In this paper we focus on the mean average precision across all categories as the measure of a team’s performance. This is done for simplicity and is justified since the ordering of teams by mean average precision was always the same as the ordering by object categories won.</p></div></li><li class="c-article-footnote--listed__item" id="Fn9" data-counter="9."><div class="c-article-footnote--listed__content"><p>Table <a data-track="click" data-track-label="link" data-track-action="table anchor" href="/article/10.1007/s11263-015-0816-y#Tab8">8</a> omits 4 teams which submitted results but chose not to officially participate in the challenge.</p></div></li><li class="c-article-footnote--listed__item" id="Fn10" data-counter="10."><div class="c-article-footnote--listed__content"><p>Personal communication with members of the UvA team.</p></div></li><li class="c-article-footnote--listed__item" id="Fn11" data-counter="11."><div class="c-article-footnote--listed__content"><p>For rigid versus deformable objects, the average scale in each bin is 34.1–34.2 % for classification and localization, and 13.5–13.7 % for detection. For texture, the average scale in each of the four bins is 31.1–31.3 % for classification and localization, and 12.7–12.8 % for detection.</p></div></li><li class="c-article-footnote--listed__item" id="Fn12" data-counter="12."><div class="c-article-footnote--listed__content"><p>Natural object detection classes are removed from this analysis because there are only 3 and 13 natural untextured and low-textured classes respectively, and none remain after scale normalization. All other bins contain at least 9 object classes after scale normalization.</p></div></li><li class="c-article-footnote--listed__item" id="Fn13" data-counter="13."><div class="c-article-footnote--listed__content"><p> <a href="http://webscope.sandbox.yahoo.com/catalog.php?datatype=i&did=67">http://webscope.sandbox.yahoo.com/catalog.php?datatype=i&did=67</a>.</p></div></li></ol></div></div></section><div id="MagazineFulltextArticleBodySuffix"><section aria-labelledby="Bib1" data-title="References"><div class="c-article-section" id="Bib1-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="Bib1">References</h2><div class="c-article-section__content" id="Bib1-content"><div data-container-section="references"><ul class="c-article-references" data-track-component="outbound reference" data-track-context="references section"><li class="c-article-references__item js-c-reading-companion-references-item"><p class="c-article-references__text" id="ref-CR1">Ahonen, T., Hadid, A., & Pietikinen, M. 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In <i>ECCV</i>.</p></li></ul><p class="c-article-references__download u-hide-print"><a data-track="click" data-track-action="download citation references" data-track-label="link" rel="nofollow" href="https://citation-needed.springer.com/v2/references/10.1007/s11263-015-0816-y?format=refman&flavour=references">Download references<svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-download-medium"></use></svg></a></p></div></div></div></section></div><section data-title="Acknowledgments"><div class="c-article-section" id="Ack1-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="Ack1">Acknowledgments</h2><div class="c-article-section__content" id="Ack1-content"><p>We thank Stanford University, UNC Chapel Hill, Google and Facebook for sponsoring the challenges, and NVIDIA for providing computational resources to participants of ILSVRC2014. We thank our advisors over the years: Lubomir Bourdev, Alexei Efros, Derek Hoiem, Jitendra Malik, Chuck Rosenberg and Andrew Zisserman. We thank the PASCAL VOC organizers for partnering with us in running ILSVRC2010-2012. We thank all members of the Stanford vision lab for supporting the challenges and putting up with us along the way. Finally, and most importantly, we thank all researchers that have made the ILSVRC effort a success by competing in the challenges and by using the datasets to advance computer vision.</p></div></div></section><section aria-labelledby="author-information" data-title="Author information"><div class="c-article-section" id="author-information-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="author-information">Author information</h2><div class="c-article-section__content" id="author-information-content"><span class="c-article-author-information__subtitle u-visually-hidden" id="author-notes">Author notes</span><ol class="c-article-author-information__list"></ol><h3 class="c-article__sub-heading" id="affiliations">Authors and Affiliations</h3><ol class="c-article-author-affiliation__list"><li id="Aff1"><p class="c-article-author-affiliation__address">Stanford University, Stanford, CA, USA</p><p class="c-article-author-affiliation__authors-list">Olga Russakovsky, Hao Su, Jonathan Krause, Sanjeev Satheesh, Sean Ma, Zhiheng Huang, Andrej Karpathy, Michael Bernstein & Li Fei-Fei</p></li><li id="Aff2"><p class="c-article-author-affiliation__address">University of Michigan, Ann Arbor, MI, USA</p><p class="c-article-author-affiliation__authors-list">Jia Deng</p></li><li id="Aff3"><p class="c-article-author-affiliation__address">Massachusetts Institute of Technology, Cambridge, MA, USA</p><p class="c-article-author-affiliation__authors-list">Aditya Khosla</p></li><li id="Aff4"><p class="c-article-author-affiliation__address">UNC Chapel Hill, Chapel Hill, NC, USA</p><p class="c-article-author-affiliation__authors-list">Alexander C. 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Hebert.</p><p>Olga Russakovsky and Jia Deng authors contributed equally.</p></div></div></section><section aria-labelledby="appendices"><div class="c-article-section" id="appendices-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="appendices">Appendices</h2><div class="c-article-section__content" id="appendices-content"><h3 class="c-article__sub-heading" id="App1">Appendix 1: ILSVRC2012-2014 Image Classification and Single-Object Localization Object Categories</h3> <div class="c-article-section__figure c-article-section__figure--no-border" data-test="figure" data-container-section="figure" id="figure-c"><figure><div class="c-article-section__figure-content" id="Figc"><div class="c-article-section__figure-item"><div class="c-article-section__figure-content"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/art%3A10.1007%2Fs11263-015-0816-y/MediaObjects/11263_2015_816_Figc_HTML.gif?as=webp"><img aria-describedby="Figc" src="//media.springernature.com/lw685/springer-static/image/art%3A10.1007%2Fs11263-015-0816-y/MediaObjects/11263_2015_816_Figc_HTML.gif" alt="figure c" loading="lazy"></picture></div></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-c-desc"></div></div></figure></div> <h3 class="c-article__sub-heading" id="App2">Appendix 2: Additional Single-Object Localization Dataset Statistics</h3><p>We consider two additional metrics of object localization difficulty: chance performance of localization and the level of clutter. We use these metrics to compare ILSVRC2012-2014 single-object localization dataset to the PASCAL VOC 2012 object detection benchmark. The measures of localization difficulty are computed on the validation set of both datasets. According to both of these measures of difficulty there is a subset of ILSVRC which is as challenging as PASCAL but more than an order of magnitude greater in size. Figure <a data-track="click" data-track-label="link" data-track-action="figure anchor" href="/article/10.1007/s11263-015-0816-y#Fig16">16</a> shows the distributions of different properties (object scale, chance performance of localization and level of clutter) across the different classes in the two datasets.</p><div class="c-article-section__figure js-c-reading-companion-figures-item" data-test="figure" data-container-section="figure" id="figure-16" data-title="Fig. 16"><figure><figcaption><b id="Fig16" class="c-article-section__figure-caption" data-test="figure-caption-text">Fig. 16</b></figcaption><div class="c-article-section__figure-content"><div class="c-article-section__figure-item"><a class="c-article-section__figure-link" data-test="img-link" data-track="click" data-track-label="image" data-track-action="view figure" href="/article/10.1007/s11263-015-0816-y/figures/16" rel="nofollow"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/art%3A10.1007%2Fs11263-015-0816-y/MediaObjects/11263_2015_816_Fig16_HTML.gif?as=webp"><img aria-describedby="Fig16" src="//media.springernature.com/lw685/springer-static/image/art%3A10.1007%2Fs11263-015-0816-y/MediaObjects/11263_2015_816_Fig16_HTML.gif" alt="figure 16" loading="lazy"></picture></a></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-16-desc"><p>Distribution of various measures of localization difficulty on the ILSVRC2012-2014 single-object localization (<i>dark green</i>) and PASCAL VOC 2012 (<i>light blue</i>) validation sets. Object scale is fraction of image area occupied by an average object instance. Chance performance of localization and level of clutter are defined in Appendix <a data-track="click" data-track-label="link" data-track-action="section anchor" href="/article/10.1007/s11263-015-0816-y#Sec48">1</a>. The plots on <i>top</i> contain the full ILSVRC validation set with 1000 classes; the plots on the <i>bottom</i> contain 200 ILSVRC classes with the lowest chance performance of localization. All plots contain all 20 classes of PASCAL VOC</p></div></div><div class="u-text-right u-hide-print"><a class="c-article__pill-button" data-test="article-link" data-track="click" data-track-label="button" data-track-action="view figure" href="/article/10.1007/s11263-015-0816-y/figures/16" data-track-dest="link:Figure16 Full size image" aria-label="Full size image figure 16" rel="nofollow"><span>Full size image</span><svg width="16" height="16" focusable="false" role="img" aria-hidden="true" class="u-icon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-eds-i-chevron-right-small"></use></svg></a></div></figure></div> <p> <i>Chance Performance of Localization (CPL)</i> Chance performance on a dataset is a common metric to consider. We define the CPL measure as the expected accuracy of a detector which first randomly samples an object instance of that class and then uses its bounding box directly as the proposed localization window on all other images (after rescaling the images to the same size). Concretely, let <span class="mathjax-tex">$B_1,B_2,\dots ,B_N$</span> be all the bounding boxes of the object instances within a class, then</p><div id="Equ6" class="c-article-equation"><div class="c-article-equation__content"><span class="mathjax-tex">$$\begin{aligned} \text{ CPL } = \frac{\sum _i \sum _{j \ne i} IOU(B_i,B_j)\ge 0.5}{N(N-1)} \end{aligned}$$</span></div><div class="c-article-equation__number"> (6) </div></div><p>Some of the most difficult ILSVRC categories to localize according to this metric are basketball, swimming trunks, ping pong ball and rubber eraser, all with less than <span class="mathjax-tex">$0.2\,\%$</span> CPL. This measure correlates strongly (<span class="mathjax-tex">$\rho = 0.9$</span>) with the average scale of the object (fraction of image occupied by object). The average CPL across the <span class="mathjax-tex">$1000$</span> ILSVRC categories is <span class="mathjax-tex">$20.8\,\%$</span>. The 20 PASCAL categories have an average CPL of <span class="mathjax-tex">$8.7\,\%$</span>, which is the same as the CPL of the <span class="mathjax-tex">$562$</span> most difficult categories of ILSVRC.</p><p> <i>Clutter</i> Intuitively, even small objects are easy to localize on a plain background. To quantify clutter we employ the objectness measure of (Alexe et al. <a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 2012" title="Alexe, B., Deselares, T., & Ferrari, V. (2012). Measuring the objectness of image windows. IEEE Transactions on Pattern Analysis and Machine Intelligence, 34(11), 2189–2202." href="/article/10.1007/s11263-015-0816-y#ref-CR2" id="ref-link-section-d138070400e21220">2012</a>), which is a class-generic object detector evaluating how likely a window in the image contains a coherent object (of any class) as opposed to background (sky, water, grass). For every image <span class="mathjax-tex">$m$</span> containing target object instances at positions <span class="mathjax-tex">$B_1^m,B_2^m,\dots $</span>, we use the publicly available objectness software to sample 1000 windows <span class="mathjax-tex">$W_1^m,W_2^m,\dots W_{1000}^m$</span>, in order of decreasing probability of the window containing any generic object. Let <span class="u-small-caps">obj</span>(m) be the number of generic object-looking windows sampled before localizing an instance of the target category, i.e., <span class="mathjax-tex">$\text{ obj }(m) = \min \{k: \max _i \text{ iou }(W_k^m,B_i^m) \ge 0.5\}$</span>. For a category containing M images, we compute the average number of such windows per image and define</p><div id="Equ7" class="c-article-equation"><div class="c-article-equation__content"><span class="mathjax-tex">$$\begin{aligned} \textsc {Clutter} = \log _{2} \large \left( \frac{1}{M}\sum _m \textsc {Obj}(m) \large \right) \end{aligned}$$</span></div><div class="c-article-equation__number"> (7) </div></div><p>The higher the clutter of a category, the harder the objects are to localize according to generic cues. If an object can’t be localized with the first 1000 windows (as is the case for <span class="mathjax-tex">$1\,\%$</span> of images on average per category in ILSVRC and <span class="mathjax-tex">$5\,\%$</span> in PASCAL), we set <span class="u-small-caps">obj</span> <span class="mathjax-tex">$(m)=1001$</span>. The fact that more than <span class="mathjax-tex">$95\,\%$</span> of objects can be localized with these windows imply that the objectness cue is already quite strong, so objects that require many windows on average will be extremely difficult to detect: e.g., ping pong ball (clutter of 9.57, or 758 windows on average), basketball (clutter of 9.21), puck (clutter of 9.17) in ILSVRC. The most difficult object in PASCAL is bottle with clutter score of <span class="mathjax-tex">$8.47$</span>. On average, ILSVRC has clutter score of <span class="mathjax-tex">$3.59$</span>. The most difficult subset of ILSVRC with 250 object categories has an order of magnitude more categories and the same average amount of clutter (of <span class="mathjax-tex">$5.90$</span>) as the PASCAL dataset.</p><h3 class="c-article__sub-heading" id="App3">Appendix 3: Manually Curated Queries for Obtaining Object Detection Scene Images</h3><p>In Sect. <a data-track="click" data-track-label="link" data-track-action="section anchor" href="/article/10.1007/s11263-015-0816-y#Sec19">3.3.2</a> we discussed three types of queries we used for collecting the object detection images: (1) single object category name or a synonym; (2) a pair of object category names; (3) a manual query, typically targetting one or more object categories with insufficient data. Here we provide a list of the 129 manually curated queries:</p><div class="c-article-section__figure c-article-section__figure--no-border" data-test="figure" data-container-section="figure" id="figure-d"><figure><div class="c-article-section__figure-content" id="Figd"><div class="c-article-section__figure-item"><div class="c-article-section__figure-content"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/art%3A10.1007%2Fs11263-015-0816-y/MediaObjects/11263_2015_816_Figd_HTML.gif?as=webp"><img aria-describedby="Figd" src="//media.springernature.com/lw685/springer-static/image/art%3A10.1007%2Fs11263-015-0816-y/MediaObjects/11263_2015_816_Figd_HTML.gif" alt="figure d" loading="lazy"></picture></div></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-d-desc"></div></div></figure></div> <h3 class="c-article__sub-heading" id="App4">Appendix 4: Hierarchy of Questions for Full Image Annotation</h3><p>The following is a hierarchy of questions manually constructed for crowdsourcing full annotation of images with the presence or absence of 200 object detection categories in ILSVRC2013 and ILSVRC2014. All questions are of the form “is there a ... in the image?” Questions marked with <span class="mathjax-tex">$\bullet $</span> are asked on every image. If the answer to a question is determined to be “no” then the answer to all descendant questions is assumed to be “no”. The 200 numbered leaf nodes correspond to the 200 object detection categories.</p><p>The goal in the hierarchy construction is to save cost (by asking as few questions as possible on every image) while avoiding any ambiguity in questions which would lead to false negatives during annotation. This hierarchy is not tree-structured; some questions have multiple parents.</p><div class="c-article-section__figure c-article-section__figure--no-border" data-test="figure" data-container-section="figure" id="figure-e"><figure><div class="c-article-section__figure-content" id="Fige"><div class="c-article-section__figure-item"><div class="c-article-section__figure-content"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/art%3A10.1007%2Fs11263-015-0816-y/MediaObjects/11263_2015_816_Fige_HTML.gif?as=webp"><img aria-describedby="Fige" src="//media.springernature.com/lw685/springer-static/image/art%3A10.1007%2Fs11263-015-0816-y/MediaObjects/11263_2015_816_Fige_HTML.gif" alt="figure e" loading="lazy"></picture></div></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-e-desc"></div></div></figure></div> <div class="c-article-section__figure c-article-section__figure--no-border" data-test="figure" data-container-section="figure" id="figure-f"><figure><div class="c-article-section__figure-content" id="Figf"><div class="c-article-section__figure-item"><div class="c-article-section__figure-content"><picture><source type="image/webp" srcset="//media.springernature.com/lw685/springer-static/image/art%3A10.1007%2Fs11263-015-0816-y/MediaObjects/11263_2015_816_Figf_HTML.gif?as=webp"><img aria-describedby="Figf" src="//media.springernature.com/lw685/springer-static/image/art%3A10.1007%2Fs11263-015-0816-y/MediaObjects/11263_2015_816_Figf_HTML.gif" alt="figure f" loading="lazy"></picture></div></div><div class="c-article-section__figure-description" data-test="bottom-caption" id="figure-f-desc"></div></div></figure></div> <h3 class="c-article__sub-heading" id="App5">Appendix 5: Modification to Bounding Box System for Object Detection</h3><p>The bounding box annotation system described in Sect. <a data-track="click" data-track-label="link" data-track-action="section anchor" href="/article/10.1007/s11263-015-0816-y#Sec15">3.2.1</a> is used for annotating images for both the single-object localization dataset and the object detection dataset. However, two additional manual post-processing are needed to ensure accuracy in the object detection scenario:</p><p> <i>Ambiguous Objects</i> The first common source of error was that workers were not able to accurately differentiate some object classes during annotation. Some commonly confused labels were seal and sea otter, backpack and purse, banjo and guitar, violin and cello, brass instruments (trumpet, trombone, french horn and brass), flute and oboe, ladle and spatula. Despite our best efforts (providing positive and negative example images in the annotation task, adding text explanations to alert the user to the distinction between these categories) these errors persisted.</p><p>In the single-object localization setting, this problem was not as prominent for two reasons. First, the way the data was collected imposed a strong prior on the object class which was present. Second, since only one object category needed to be annotated per image, ambiguous images could be discarded: for example, if workers couldn’t agree on whether or not a trumpet was in fact present, this image could simply be removed. In contrast, for the object detection setting consensus had to be reached for all target categories on all images.</p><p>To fix this problem, once bounding box annotations were collected we manually looked through all cases where the bounding boxes for two different object classes had significant overlap with each other (about <span class="mathjax-tex">$3\,\%$</span> of the collected boxes). About a quarter of these boxes were found to correspond to incorrect objects and were removed. Crowdsourcing this post-processing step (with very stringent accuracy constraints) would be possible but it occurred in few enough cases that it was faster (and more accurate) to do this in-house.</p><p> <i>Duplicate Annotations</i> The second common source of error were duplicate bounding boxes drawn on the same object instance. Despite instructions not to draw more than one bounding box around the same object instance and constraints in the annotation UI enforcing at least a 5 pixel difference between different bounding boxes, these errors persisted. One reason was that sometimes the initial bounding box was not perfect and subsequent labelers drew a slightly improved alternative.</p><p>This type of error was also present in the single-object localization scenario but was not a major cause for concern. A duplicate bounding box is a slightly perturbed but still correct positive example, and single-object localization is only concerned with correctly localizing one object instance. For the detection task algorithms are evaluated on the ability to localize <i>every</i> object instance, and penalized for duplicate detections, so it is imperative that these labeling errors are corrected (even if they only appear in about <span class="mathjax-tex">$0.6\,\%$</span> of cases).</p><p>Approximately <span class="mathjax-tex">$1\,\%$</span> of bounding boxes were found to have significant overlap of more than <span class="mathjax-tex">$50\,\%$</span> with another bounding box of the same object class.We again manually verified all of these cases in-house. In approximately <span class="mathjax-tex">$40\,\%$</span> of the cases the two bounding boxes correctly corresponded to different people in a crowd, to stacked plates, or to musical instruments nearby in an orchestra. In the other <span class="mathjax-tex">$60\,\%$</span> of cases one of the boxes was randomly removed.</p><p>These verification steps complete the annotation procedure of bounding boxes around every instance of every object class in validation, test and a subset of training images for the detection task.</p><p> <i>Training Set Annotation</i> With the optimized algorithm of Sect. <a data-track="click" data-track-label="link" data-track-action="section anchor" href="/article/10.1007/s11263-015-0816-y#Sec20">3.3.3</a> we fully annotated the validation and test sets. However, annotating <i>all</i> training images with all target object classes was still a budget challenge. Positive training images taken from the single-object localization dataset already had bounding box annotations of all instances of one object class on each image. We extended the existing annotations to the detection dataset by making two modification. First, we corrected any bounding box omissions resulting from merging fine-grained categories: i.e., if an image belonged to the “dalmatian” category and all instances of “dalmatian” were annotated with bounding boxes for single-object localization, we ensured that all remaining “dog” instances are also annotated for the object detection task. Second, we collected significantly more training data for the person class because the existing annotation set was not diverse enough to be representative (the only people categories in the single-object localization task are scuba diver, groom, and ballplayer). To compensate, we additionally annotated people in a large fraction of the existing training set images.</p><h3 class="c-article__sub-heading" id="App6">Appendix 6: Competition Protocol</h3><p> <i>Competition Format</i> At the beginning of the competition period each year we release the new training/validation/test images, training/validation annotations, and competition specification for the year. We then specify a deadline for submission, usually approximately 4 months after the release of data. Teams are asked to upload a text file of their predicted annotations on test images by this deadline to a provided server. We then evaluate all submissions and release the results.</p><p>For every task we released code that takes a text file of automatically generated image annotations and compares it with the ground truth annotations to return a quantitative measure of algorithm accuracy. Teams can use this code to evaluate their performance on the validation data.</p><p>As described in Everingham et al. (<a data-track="click" data-track-action="reference anchor" data-track-label="link" data-test="citation-ref" aria-label="Reference 2014" title="Everingham, M., Eslami, S. M. A., Van Gool, L., Williams, C. K. I., Winn, J., & Zisserman, A. (2014). The Pascal Visual Object Classes (VOC) challenge—A retrospective. International Journal of Computer Vision, 111, 98–136." href="/article/10.1007/s11263-015-0816-y#ref-CR20" id="ref-link-section-d138070400e22041">2014</a>), there are three options for measuring performance on test data: (i) Release test images and annotations, and allow participants to assess performance themselves; (ii) Release test images but not test annotations—participants submit results and organizers assess performance; (iii) Neither test images nor annotations are released—participants submit software and organizers run it on new data and assess performance. In line with the PASCAL VOC choice, we opted for option (ii). Option (i) allows too much leeway in overfitting to the test data; option (iii) is infeasible, especially given the scale of our test set (40K–100K images).</p><p>We released ILSVRC2010 test annotations for the image classification task, but all other test annotations have remained hidden to discourage fine-tuning results on the test data.</p><p> <i>Evaluation Protocol After the Challenge</i> After the challenge period we set up an automatic evaluation server that researchers can use throughout the year to continue evaluating their algorithms against the ground truth test annotations. We limit teams to 2 submissions per week to discourage parameter tuning on the test data, and in practice we have never had a problem with researchers abusing the system.</p></div></div></section><section data-title="Rights and permissions"><div class="c-article-section" id="rightslink-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="rightslink">Rights and permissions</h2><div class="c-article-section__content" id="rightslink-content"><p class="c-article-rights"><a data-track="click" data-track-action="view rights and permissions" data-track-label="link" href="https://s100.copyright.com/AppDispatchServlet?title=ImageNet%20Large%20Scale%20Visual%20Recognition%20Challenge&author=Olga%20Russakovsky%20et%20al&contentID=10.1007%2Fs11263-015-0816-y&copyright=Springer%20Science%2BBusiness%20Media%20New%20York&publication=0920-5691&publicationDate=2015-04-11&publisherName=SpringerNature&orderBeanReset=true">Reprints and permissions</a></p></div></div></section><section aria-labelledby="article-info" data-title="About this article"><div class="c-article-section" id="article-info-section"><h2 class="c-article-section__title js-section-title js-c-reading-companion-sections-item" id="article-info">About this article</h2><div class="c-article-section__content" id="article-info-content"><div class="c-bibliographic-information"><div class="u-hide-print c-bibliographic-information__column c-bibliographic-information__column--border"><a data-crossmark="10.1007/s11263-015-0816-y" target="_blank" rel="noopener" href="https://crossmark.crossref.org/dialog/?doi=10.1007/s11263-015-0816-y" data-track="click" data-track-action="Click Crossmark" data-track-label="link" data-test="crossmark"><img loading="lazy" width="57" height="81" alt="Check for updates. 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