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data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Mostra/Nascondi l'indice" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Mostra/Nascondi l'indice</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Frequenza dei fotogrammi</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Vai a una voce in un'altra lingua. Disponibile in 40 lingue" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-40" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">40 lingue</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%85%D8%B9%D8%AF%D9%84_%D8%A3%D8%B7%D8%B1" title="معدل أطر - arabo" lang="ar" hreflang="ar" data-title="معدل أطر" data-language-autonym="العربية" data-language-local-name="arabo" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Brzina_smjenjivanja_kadrova" title="Brzina smjenjivanja kadrova - bosniaco" lang="bs" hreflang="bs" data-title="Brzina smjenjivanja kadrova" data-language-autonym="Bosanski" data-language-local-name="bosniaco" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Fotograma_per_segon" title="Fotograma per segon - catalano" lang="ca" hreflang="ca" data-title="Fotograma per segon" data-language-autonym="Català" data-language-local-name="catalano" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%D8%A6%DB%8E%D9%81_%D9%BE%DB%8C_%D8%A6%DB%8E%D8%B3" title="ئێف پی ئێس - curdo centrale" lang="ckb" hreflang="ckb" data-title="ئێف پی ئێس" data-language-autonym="کوردی" data-language-local-name="curdo centrale" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Sn%C3%ADmkov%C3%A1_frekvence" title="Snímková frekvence - ceco" lang="cs" hreflang="cs" data-title="Snímková frekvence" data-language-autonym="Čeština" data-language-local-name="ceco" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/FPS" title="FPS - danese" lang="da" hreflang="da" data-title="FPS" data-language-autonym="Dansk" data-language-local-name="danese" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Bildfrequenz" title="Bildfrequenz - tedesco" lang="de" hreflang="de" data-title="Bildfrequenz" data-language-autonym="Deutsch" data-language-local-name="tedesco" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%9A%CE%B1%CF%81%CE%AD_%CE%B1%CE%BD%CE%AC_%CE%B4%CE%B5%CF%85%CF%84%CE%B5%CF%81%CF%8C%CE%BB%CE%B5%CF%80%CF%84%CE%BF" title="Καρέ ανά δευτερόλεπτο - greco" lang="el" hreflang="el" data-title="Καρέ ανά δευτερόλεπτο" data-language-autonym="Ελληνικά" data-language-local-name="greco" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Frame_rate" title="Frame rate - inglese" lang="en" hreflang="en" data-title="Frame rate" data-language-autonym="English" data-language-local-name="inglese" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Fotogramas_por_segundo" title="Fotogramas por segundo - spagnolo" lang="es" hreflang="es" data-title="Fotogramas por segundo" data-language-autonym="Español" data-language-local-name="spagnolo" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Kaadrisagedus" title="Kaadrisagedus - estone" lang="et" hreflang="et" data-title="Kaadrisagedus" data-language-autonym="Eesti" data-language-local-name="estone" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%86%D8%B1%D8%AE_%D9%81%D8%B1%DB%8C%D9%85" title="نرخ فریم - persiano" lang="fa" hreflang="fa" data-title="نرخ فریم" data-language-autonym="فارسی" data-language-local-name="persiano" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Kuvataajuus" title="Kuvataajuus - finlandese" lang="fi" hreflang="fi" data-title="Kuvataajuus" data-language-autonym="Suomi" data-language-local-name="finlandese" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Images_par_seconde" title="Images par seconde - francese" lang="fr" hreflang="fr" data-title="Images par seconde" data-language-autonym="Français" data-language-local-name="francese" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%A7%D7%A6%D7%91_%D7%A4%D7%A8%D7%99%D7%99%D7%9E%D7%99%D7%9D" title="קצב פריימים - ebraico" lang="he" hreflang="he" data-title="קצב פריימים" data-language-autonym="עברית" data-language-local-name="ebraico" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Sli%C4%8Dice_po_sekundi" title="Sličice po sekundi - croato" lang="hr" hreflang="hr" data-title="Sličice po sekundi" data-language-autonym="Hrvatski" data-language-local-name="croato" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%BF%D5%A1%D5%A4%D6%80%D5%AB_%D5%B0%D5%A1%D5%B3%D5%A1%D5%AD%D5%B8%D6%82%D5%A9%D5%B5%D5%B8%D6%82%D5%B6" title="Կադրի հաճախություն - armeno" lang="hy" hreflang="hy" data-title="Կադրի հաճախություն" data-language-autonym="Հայերեն" data-language-local-name="armeno" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Tingkat_bingkai" title="Tingkat bingkai - indonesiano" lang="id" hreflang="id" data-title="Tingkat bingkai" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesiano" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%83%95%E3%83%AC%E3%83%BC%E3%83%A0%E3%83%AC%E3%83%BC%E3%83%88" title="フレームレート - giapponese" lang="ja" hreflang="ja" data-title="フレームレート" data-language-autonym="日本語" data-language-local-name="giapponese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%99%E1%83%90%E1%83%93%E1%83%A0%E1%83%98%E1%83%A1_%E1%83%A1%E1%83%98%E1%83%AE%E1%83%A8%E1%83%98%E1%83%A0%E1%83%94" title="კადრის სიხშირე - georgiano" lang="ka" hreflang="ka" data-title="კადრის სიხშირე" data-language-autonym="ქართული" data-language-local-name="georgiano" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%ED%94%84%EB%A0%88%EC%9E%84_%EB%A0%88%EC%9D%B4%ED%8A%B8" title="프레임 레이트 - coreano" lang="ko" hreflang="ko" data-title="프레임 레이트" data-language-autonym="한국어" data-language-local-name="coreano" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Kadri_sekund%C4%93" title="Kadri sekundē - lettone" lang="lv" hreflang="lv" data-title="Kadri sekundē" data-language-autonym="Latviešu" data-language-local-name="lettone" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Kadar_bidang" title="Kadar bidang - malese" lang="ms" hreflang="ms" data-title="Kadar bidang" data-language-autonym="Bahasa Melayu" data-language-local-name="malese" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Beelden_per_seconde" title="Beelden per seconde - olandese" lang="nl" hreflang="nl" data-title="Beelden per seconde" data-language-autonym="Nederlands" data-language-local-name="olandese" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Bildefrekvens" title="Bildefrekvens - norvegese bokmål" lang="nb" hreflang="nb" data-title="Bildefrekvens" data-language-autonym="Norsk bokmål" data-language-local-name="norvegese bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pcd mw-list-item"><a href="https://pcd.wikipedia.org/wiki/Images_p%C3%A8r_seconde" title="Images pèr seconde - piccardo" lang="pcd" hreflang="pcd" data-title="Images pèr seconde" data-language-autonym="Picard" data-language-local-name="piccardo" class="interlanguage-link-target"><span>Picard</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Klatki_na_sekund%C4%99" title="Klatki na sekundę - polacco" lang="pl" hreflang="pl" data-title="Klatki na sekundę" data-language-autonym="Polski" data-language-local-name="polacco" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Quadros_por_segundo" title="Quadros por segundo - portoghese" lang="pt" hreflang="pt" data-title="Quadros por segundo" data-language-autonym="Português" data-language-local-name="portoghese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9A%D0%B0%D0%B4%D1%80%D0%BE%D0%B2%D0%B0%D1%8F_%D1%87%D0%B0%D1%81%D1%82%D0%BE%D1%82%D0%B0" title="Кадровая частота - russo" lang="ru" hreflang="ru" data-title="Кадровая частота" data-language-autonym="Русский" data-language-local-name="russo" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Frame_rate" title="Frame rate - Simple English" lang="en-simple" hreflang="en-simple" data-title="Frame rate" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Obrazov%C3%A1_frekvencia" title="Obrazová frekvencia - slovacco" lang="sk" hreflang="sk" data-title="Obrazová frekvencia" data-language-autonym="Slovenčina" data-language-local-name="slovacco" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Frekuenca_vizuale" title="Frekuenca vizuale - albanese" lang="sq" hreflang="sq" data-title="Frekuenca vizuale" data-language-autonym="Shqip" data-language-local-name="albanese" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%91%D1%80%D0%B7%D0%B8%D0%BD%D0%B0_%D1%81%D0%BC%D0%B5%D1%9A%D0%B8%D0%B2%D0%B0%D1%9A%D0%B0_%D1%81%D0%BB%D0%B8%D0%BA%D0%B0" title="Брзина смењивања слика - serbo" lang="sr" hreflang="sr" data-title="Брзина смењивања слика" data-language-autonym="Српски / srpski" data-language-local-name="serbo" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Bildhastighet" title="Bildhastighet - svedese" lang="sv" hreflang="sv" data-title="Bildhastighet" data-language-autonym="Svenska" data-language-local-name="svedese" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%AD%E0%B8%B1%E0%B8%95%E0%B8%A3%E0%B8%B2%E0%B9%80%E0%B8%9F%E0%B8%A3%E0%B8%A1" title="อัตราเฟรม - thailandese" lang="th" hreflang="th" data-title="อัตราเฟรม" data-language-autonym="ไทย" data-language-local-name="thailandese" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Saniyedeki_kare_say%C4%B1s%C4%B1" title="Saniyedeki kare sayısı - turco" lang="tr" hreflang="tr" data-title="Saniyedeki kare sayısı" data-language-autonym="Türkçe" data-language-local-name="turco" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%A7%D0%B0%D1%81%D1%82%D0%BE%D1%82%D0%B0_%D0%BA%D0%B0%D0%B4%D1%80%D1%96%D0%B2" title="Частота кадрів - ucraino" lang="uk" hreflang="uk" data-title="Частота кадрів" data-language-autonym="Українська" data-language-local-name="ucraino" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/T%E1%BB%91c_%C4%91%E1%BB%99_khung_h%C3%ACnh" title="Tốc độ khung hình - vietnamita" lang="vi" hreflang="vi" data-title="Tốc độ khung hình" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamita" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%B8%A7%E7%8E%87" title="帧率 - cinese" lang="zh" hreflang="zh" data-title="帧率" data-language-autonym="中文" data-language-local-name="cinese" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E5%B9%80%E7%8E%87" title="幀率 - cantonese" lang="yue" hreflang="yue" data-title="幀率" data-language-autonym="粵語" data-language-local-name="cantonese" class="interlanguage-link-target"><span>粵語</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q119565#sitelinks-wikipedia" title="Modifica collegamenti interlinguistici" class="wbc-editpage">Modifica collegamenti</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespace"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Frequenza_dei_fotogrammi" title="Vedi la voce [c]" accesskey="c"><span>Voce</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a 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data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Aspetto</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">sposta nella barra laterale</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">nascondi</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">Da Wikipedia, l'enciclopedia libera.</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="it" dir="ltr"><p>La <b>frequenza dei fotogrammi</b> (in <a href="/wiki/Lingua_inglese" title="Lingua inglese">lingua inglese</a> <i><b>frame rate</b></i>, oppure abbreviato nel <a href="/wiki/Gergo" title="Gergo">gergo</a> tecnico del gaming <i><b>FPS</b></i>, cioè <i><b>frames per second</b></i>) è la <a href="/wiki/Frequenza" title="Frequenza">frequenza</a> di cattura o riproduzione dei <a href="/wiki/Fotogramma" title="Fotogramma">fotogrammi</a> che compongono un <a href="/wiki/Filmato" class="mw-redirect" title="Filmato">filmato</a>. Un filmato, o un'animazione al computer, è infatti una sequenza di <a href="/wiki/Immagine" title="Immagine">immagini</a> riprodotte ad una velocità sufficientemente alta da fornire, all'occhio umano, l'illusione del movimento. La frequenza dei fotogrammi viene misurata in <a href="/wiki/Hertz" title="Hertz">hertz</a> (Hz), nei monitor a <a href="/wiki/Scansione_progressiva" title="Scansione progressiva">scansione progressiva</a>, oppure espresso in termini di fotogrammi per secondo (<b>fps</b>). </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Standard">Standard</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Frequenza_dei_fotogrammi&veaction=edit&section=1" title="Modifica la sezione Standard" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Frequenza_dei_fotogrammi&action=edit&section=1" title="Edit section's source code: Standard"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Le modalità di scansione video standard - e le relative frequenze - utilizzate in ambito <a href="/wiki/Televisione" title="Televisione">televisivo</a> e <a href="/wiki/Cinematografia" class="mw-redirect" title="Cinematografia">cinematografico</a> sono: </p> <ul><li><b><a href="/wiki/24p" title="24p">24p</a></b> è sistema di scansione non interlacciato a <span class="nowrap"><span data-sort-value="7001240000000000000♠"></span>24 fps</span>, originariamente concepito per il <a href="/wiki/Non-linear_video_editing" class="mw-redirect" title="Non-linear video editing">montaggio non lineare</a>, ma largamente utilizzato anche per motivi estetici a motivo della resa simile, in termini di movimento, a quella della <a href="/wiki/Pellicola_cinematografica" title="Pellicola cinematografica">pellicola cinematografica</a>. Nella conversione al sistema NTSC, il frame rate viene rallentato a <span class="nowrap"><span data-sort-value="7001239760000000000♠"></span>23,976 fps</span>, mentre in quella a PAL o SECAM viene velocizzato a <span class="nowrap"><span data-sort-value="7001250000000000000♠"></span>25 fps</span>. La modalità 24p fu lo standard <i><a href="/wiki/De_facto" title="De facto">de facto</a></i> del cinema dalla metà degli <a href="/wiki/Anni_1920" title="Anni 1920">anni 1920</a>.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></li> <li><b>30p</b> è uno standard non interlacciato a <span class="nowrap"><span data-sort-value="7001300000000000000♠"></span>30 fps</span>. La <a href="/wiki/Scansione_progressiva" title="Scansione progressiva">scansione progressiva</a>, rispetto a quella interlacciata, migliora la qualità dell'immagine e viene utilizzata per contenuti ad <a href="/wiki/Alta_definizione" class="mw-redirect" title="Alta definizione">alta definizione</a>; lo standard 30p permette, infatti, una riproduzione video priva di <a href="/wiki/Artefatto_(segnali)" class="mw-redirect" title="Artefatto (segnali)">artefatti</a>. Questo frame rate fu utilizzato, tra il <a href="/wiki/1954" title="1954">1954</a>-<a href="/wiki/1956" title="1956">1956</a>, anche dal formato cinematografico ad alta definizione <a href="/wiki/Todd-AO" title="Todd-AO">Todd-AO</a>.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup></li> <li><b>50i</b> (50 semiquadri al secondo = <span class="nowrap"><span data-sort-value="7001250000000000000♠"></span>25 fps</span>) è il sistema di <a href="/wiki/Scansione_interlacciata" title="Scansione interlacciata">scansione interlacciata</a> standard dei sistemi di codifica <a href="/wiki/PAL_(televisione)" title="PAL (televisione)">PAL</a> e <a href="/wiki/S%C3%89CAM" title="SÉCAM">SÉCAM</a>, comunemente utilizzati dalle <a href="/wiki/Televisione_analogica" title="Televisione analogica">televisioni analogiche</a> <a href="/wiki/Europa" title="Europa">europee</a>.</li> <li><b>60i</b> (60 o 59,94 semiquadri al secondo = <span class="nowrap"><span data-sort-value="7001299700000000000♠"></span>29,97 fps</span>) è il sistema di scansione interlacciata standard per il sistema di codifica analogico <a href="/wiki/NTSC" title="NTSC">NTSC</a> (comunemente utilizzato dalle TV <a href="/wiki/Stati_Uniti_d%27America" title="Stati Uniti d'America">statunitensi</a>). Lo standard fu sviluppato da <a href="/wiki/Philo_Farnsworth" title="Philo Farnsworth">Philo Farnsworth</a> e <a href="/wiki/Vladimir_Koz%27mi%C4%8D_Zvorykin" title="Vladimir Koz'mič Zvorykin">Vladimir Zvorykin</a> nel <a href="/wiki/1934" title="1934">1934</a><sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> e adottato dal sistema NTSC nel <a href="/wiki/1941" title="1941">1941</a>. Con l'introduzione del colore nel <a href="/wiki/1953" title="1953">1953</a>, l'originale frame rate fu ridotto di un fattore 1 000/1 001 al fine di evitare le interferenze tra la sottoportante croma e la portante audio del segnale.</li></ul> <div class="mw-heading mw-heading2"><h2 id="High_Frame_Rate">High Frame Rate</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Frequenza_dei_fotogrammi&veaction=edit&section=2" title="Modifica la sezione High Frame Rate" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Frequenza_dei_fotogrammi&action=edit&section=2" title="Edit section's source code: High Frame Rate"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>High Frame Rate, abbreviato in HFR, è un'elevata frequenza di fotogrammi, nome di una nuova tecnica di ripresa e di proiezione, in ambito cinematografico, introdotta dal regista <a href="/wiki/Peter_Jackson" title="Peter Jackson">Peter Jackson</a> nel <a href="/wiki/2012" title="2012">2012</a> con la trilogia de <a href="/wiki/Lo_Hobbit_(trilogia)" class="mw-redirect" title="Lo Hobbit (trilogia)"><i>Lo Hobbit</i></a>. Essa abbandona lo standard dei classici 24 fotogrammi al secondo, e introduce una nuova velocità dai "48 ai 60 fotogrammi al secondo", ottenendo così immagini più fluide e quasi prive di artefatti visivi. </p><p>Fanno parte di questa nuova tecnologia anche: </p> <ul><li><b>50p</b> e <b>60p</b> nelle modalità non interlacciate utilizzate dai sistemi <a href="/wiki/HDTV" title="HDTV">HDTV</a>. Questi formati, tuttavia, non fanno parte degli standard <a href="/wiki/ATSC" title="ATSC">ATSC</a> e <a href="/wiki/Digital_Video_Broadcasting" title="Digital Video Broadcasting">DVB</a>.</li> <li><b>120p</b> è uno standard non interlacciato a <span class="nowrap"><span data-sort-value="7002120000000000000♠"></span>120 fps</span> che verrà utilizzato dai sistemi <a href="/wiki/UHD" class="mw-redirect" title="UHD">UHD</a>.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading2"><h2 id="Interlacciamento">Interlacciamento</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Frequenza_dei_fotogrammi&veaction=edit&section=3" title="Modifica la sezione Interlacciamento" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Frequenza_dei_fotogrammi&action=edit&section=3" title="Edit section's source code: Interlacciamento"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r130657691">body:not(.skin-minerva) .mw-parser-output .vedi-anche{font-size:95%}</style><style data-mw-deduplicate="TemplateStyles:r139142988">.mw-parser-output .hatnote-content{align-items:center;display:flex}.mw-parser-output .hatnote-icon{flex-shrink:0}.mw-parser-output .hatnote-icon img{display:flex}.mw-parser-output .hatnote-text{font-style:italic}body:not(.skin-minerva) .mw-parser-output .hatnote{border:1px solid #CCC;display:flex;margin:.5em 0;padding:.2em .5em}body:not(.skin-minerva) .mw-parser-output .hatnote-text{padding-left:.5em}body.skin-minerva .mw-parser-output .hatnote-icon{padding-right:8px}body.skin-minerva .mw-parser-output .hatnote-icon img{height:auto;width:16px}body.skin--responsive .mw-parser-output .hatnote a.new{color:#d73333}body.skin--responsive .mw-parser-output .hatnote a.new:visited{color:#a55858}</style> <div class="hatnote noprint vedi-anche"> <div class="hatnote-content"><span class="noviewer hatnote-icon" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/87/Magnifying_glass_icon_mgx2.svg/18px-Magnifying_glass_icon_mgx2.svg.png" decoding="async" width="18" height="18" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/87/Magnifying_glass_icon_mgx2.svg/27px-Magnifying_glass_icon_mgx2.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/87/Magnifying_glass_icon_mgx2.svg/36px-Magnifying_glass_icon_mgx2.svg.png 2x" data-file-width="286" data-file-height="280" /></span></span> <span class="hatnote-text">Lo stesso argomento in dettaglio: <b><a href="/wiki/Interlacciamento" class="mw-redirect" title="Interlacciamento">Interlacciamento</a></b>.</span></div> </div> <p>Un fenomeno correlato al numero di fotogrammi al secondo - in particolare su uno <a href="/wiki/Schermo_a_tubo_catodico" title="Schermo a tubo catodico">schermo a tubo catodico</a> - è lo "<i>sfarfallio</i>" (<a href="/wiki/Flicker" title="Flicker">flicker</a>) dell'immagine ovvero un cambiamento continuo di luminosità che compromette la qualità dell'esperienza visiva. Poiché questo effetto è dovuto alla bassa frequenza con cui sono "ravvivati" i <a href="/wiki/Fosfori" class="mw-redirect" title="Fosfori">fosfori</a> sullo schermo, si è cercato di eliminarlo aumentando il frame rate; per fare questo, senza aumentare anche la <a href="/wiki/Larghezza_di_banda" title="Larghezza di banda">larghezza di banda</a> del segnale, si è optato per il cosiddetto <a href="/wiki/Interlacciamento" class="mw-redirect" title="Interlacciamento">interlacciamento</a>: ogni fotogramma al secondo viene suddiviso in due semiquadri, ovvero vengono prima visualizzate solo le righe dispari dell'immagine, poi solo quelle pari. In questo modo, anche se ogni riga è aggiornata 25 (o 29,97) volte al secondo, come per esempio negli standard televisivi analogici <a href="/wiki/PAL_(televisione)" title="PAL (televisione)">PAL</a> e <a href="/wiki/NTSC" title="NTSC">NTSC</a>, ogni zona dell'immagine è tracciata due volte, quasi come se fossero scansionati 50 (PAL) o 59,94 (NTSC) fotogrammi al secondo. </p> <div class="mw-heading mw-heading2"><h2 id="Frame_rate_e_visione_umana">Frame rate e visione umana</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Frequenza_dei_fotogrammi&veaction=edit&section=4" title="Modifica la sezione Frame rate e visione umana" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Frequenza_dei_fotogrammi&action=edit&section=4" title="Edit section's source code: Frame rate e visione umana"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r130657691"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r139142988"> <div class="hatnote noprint vedi-anche"> <div class="hatnote-content"><span class="noviewer hatnote-icon" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/87/Magnifying_glass_icon_mgx2.svg/18px-Magnifying_glass_icon_mgx2.svg.png" decoding="async" width="18" height="18" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/87/Magnifying_glass_icon_mgx2.svg/27px-Magnifying_glass_icon_mgx2.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/87/Magnifying_glass_icon_mgx2.svg/36px-Magnifying_glass_icon_mgx2.svg.png 2x" data-file-width="286" data-file-height="280" /></span></span> <span class="hatnote-text">Lo stesso argomento in dettaglio: <b><a href="/wiki/Persistenza_della_visione" title="Persistenza della visione">Persistenza della visione</a></b>.</span></div> </div> <p>Sebbene un filmato sembri mostrare delle immagini in movimento in realtà ciò che viene visualizzato è una sequenza di immagini fisse. Una prima spiegazione del fenomeno dal punto di vista biologico, fu ipotizzata dal fisico belga <a href="/wiki/Joseph_Plateau" title="Joseph Plateau">Joseph Plateau</a>, nel <a href="/wiki/XIX_secolo" title="XIX secolo">XIX secolo</a>, secondo il quale la percezione del movimento continuo era dovuta alla persistenza delle immagini sulla <a href="/wiki/Retina" title="Retina">retina</a>, ma questa teoria fu successivamente smentita da <a href="/wiki/Max_Wertheimer" title="Max Wertheimer">Max Wertheimer</a>: è il <a href="/wiki/Cervello" title="Cervello">cervello</a> che, secondo meccanismi non ancora del tutto chiariti, esegue un'operazione di "assemblaggio" dei singoli fotogrammi, interpretandolo come un movimento. </p> <div class="mw-heading mw-heading2"><h2 id="Note">Note</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Frequenza_dei_fotogrammi&veaction=edit&section=5" title="Modifica la sezione Note" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Frequenza_dei_fotogrammi&action=edit&section=5" title="Edit section's source code: Note"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><a href="#cite_ref-1"><b>^</b></a> <span class="reference-text">Kevin Brownlow, <i><a rel="nofollow" class="external text" href="http://www.cinemaweb.com/silentfilm/bookshelf/18_kb_2.htm">Silent Films: What Was the Right Speed?</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20110708155615/http://www.cinemaweb.com/silentfilm/bookshelf/18_kb_2.htm">Archiviato</a> l'8 luglio 2011 in <a href="/wiki/Internet_Archive" title="Internet Archive">Internet Archive</a>.</i> (1980).</span> </li> <li id="cite_note-2"><a href="#cite_ref-2"><b>^</b></a> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.widescreenmuseum.com/widescreen/todd-aospecifications.htm">Todd-AO Specifications at a Glance</a>, Widescreen Museum.</span> </li> <li id="cite_note-3"><a href="#cite_ref-3"><b>^</b></a> <span class="reference-text">Gary Edgerton, <i><a rel="nofollow" class="external text" href="http://books.google.com/books?id=28cMReggGGEC&pg=PA51">The Columbia History of American Television</a></i>, Columbia University Press, 2009, p. 51–52. <a href="/wiki/Speciale:RicercaISBN/9780231121651" class="internal mw-magiclink-isbn">ISBN 978-0-231-12165-1</a>.</span> </li> <li id="cite_note-4"><a href="#cite_ref-4"><b>^</b></a> <span class="reference-text"><cite class="citation news" style="font-style:normal"> Dario D'Elia, <a rel="nofollow" class="external text" href="https://web.archive.org/web/20130117080348/http://tomshw.it/cont/news/tv-ultra-hd-europea-nel-2015-grazie-ai-satelliti-eutelsat/42183/1.html"><span style="font-style:italic;">TV Ultra HD europea nel 2015 grazie ai satelliti Eutelsat</span></a>, in <span style="font-style:italic;"><a href="/wiki/Tom%27s_Hardware" title="Tom's Hardware">Tom's Hardware</a></span>, <a href="/wiki/L%27Espresso" title="L'Espresso">L'Espresso</a>, 8 gennaio 2013, p. 1. <small>URL consultato il 10 febbraio 2013</small> <small>(archiviato dall'<abbr title="http://www.tomshw.it/cont/news/tv-ultra-hd-europea-nel-2015-grazie-ai-satelliti-eutelsat/42183/1.html">url originale</abbr> il 17 gennaio 2013)</small>.</cite></span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="Voci_correlate">Voci correlate</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Frequenza_dei_fotogrammi&veaction=edit&section=6" title="Modifica la sezione Voci correlate" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Frequenza_dei_fotogrammi&action=edit&section=6" title="Edit section's source code: Voci correlate"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Standard_televisivo_terrestre" title="Standard televisivo terrestre">Standard televisivo terrestre</a></li> <li><a href="/wiki/Monitor_(computer)" title="Monitor (computer)">Monitor (computer)</a></li> <li><a href="/wiki/Timecode" title="Timecode">Timecode</a></li> <li><a href="/wiki/Frequenza_d%27aggiornamento" title="Frequenza d'aggiornamento">Frequenza d'aggiornamento</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Collegamenti_esterni">Collegamenti esterni</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Frequenza_dei_fotogrammi&veaction=edit&section=7" title="Modifica la sezione Collegamenti esterni" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Frequenza_dei_fotogrammi&action=edit&section=7" title="Edit section's source code: Collegamenti esterni"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><cite id="CITEREFFOLDOC" class="citation testo" style="font-style:normal">(<span style="font-weight:bolder; font-size:80%"><abbr title="inglese">EN</abbr></span>) Denis Howe, <span style="font-style:italic;"><a href="https://foldoc.org/frame_rate" class="extiw" title="foldoc:frame rate">frame rate</a></span>, in <span style="font-style:italic;"><a href="/wiki/Free_On-line_Dictionary_of_Computing" title="Free On-line Dictionary of Computing">Free On-line Dictionary of Computing</a></span>.</cite> Disponibile con licenza <a href="/wiki/GNU_Free_Documentation_License" title="GNU Free Documentation License">GFDL</a></li></ul> <style data-mw-deduplicate="TemplateStyles:r140554510">.mw-parser-output .CdA{border:1px solid 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