CINXE.COM

<!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="390"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "learnopencv.com",cType: 'managed',cRay: '923562f78d6e5fc2',cH: 'wruehAN0fe_cLfMfuyX4853ntwSVV1YZuIpQ5n5qoqo-1742475564-1.2.1.1-T2v.fF5vntOgawP9SBZ1p7dhVHNOS2FOuseb3VsZechsgwxSyJIwjOW.d0eczYop',cUPMDTk: "\/lightrag\/?__cf_chl_tk=3V5OVaWGCX8Dpbq9oMNvT84NW.vabLCdMCCEAmXTc50-1742475564-1.0.1.1-WGVN61_ftzIajX.jXl2Z2Lmz521yC02TP0daCdJZsII",cFPWv: 'b',cITimeS: '1742475564',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/lightrag\/?__cf_chl_f_tk=3V5OVaWGCX8Dpbq9oMNvT84NW.vabLCdMCCEAmXTc50-1742475564-1.0.1.1-WGVN61_ftzIajX.jXl2Z2Lmz521yC02TP0daCdJZsII",md: "kQmUIfof.0MEk6wpBnicAEHMhemBjMSjXbw6SU4hUNY-1742475564-1.2.1.1-9BHo6tYOaKcBl5enQfdkHV_AI.gtYGhMr5VhVoSwenAPQTG.veNM9LcaXb8vJa_CT3jKomcEeUsiY_ftsxdmQb3FAPtyWyxHq5pxA3VOENPBkK.pW2R33_0VR9wgObKAFDNWnimL8I2JMRy52vPQnjNjbnZH158Ns_DxugVelXZ59yH5elhuEohrlgrfZ.kRcaOoF4sNEtr8SjP3n5F7l.7slUTK99RrGJB3KVTOZY2MHcPZqFXCopRlKlwoaopHR.4xvpqNgvwSKZE_kcmJEgeK8DToKX8NHifI17tmX3GTp7xRqwyB68kLIDg.a5KgRJscfk9xO8OQnWMSCOr5vFxUm4UOepJbZCBJ0hRGm1kopKGeVF7QqzfG4JS4X5UlkQD5XEFnNCDe12CdoznPZrWHnU7hK1J8j2YwKf_ppAbN_HZPcUMM014rJm_p0LF0RG7xRV7ur3viHqoTObHkAQ1c5gNla6TFY0AwPn7HJVXSh_eCh4XwB6qhr8ToXhLFBRdpDW_dVkX1pGHkZMaft92t52X0kyLl__tm71uarNDmd00MprRZ7vC8l7W1rAt08o20JZR_fKfJsf4NRXEC.90ya1yd3DS_DNP1DSoO8LPvsb_n.8t3lZ9NDhmwvRhzhAY1f1O7qH5qMlReiqNFRCd.GW2bO66Huz__fdwJdxNF8Ayk7Qa_ngkrRvsCUAnF8ZGjFdSKkgSvFxOiGtITWMGrjHVQ_wjVPRwLG.fM1.jC.D.prngdYDTqjV58tWjEL58Xq9UDMRwBspOo_C0Y_5cyNZdvIcURb3AEQhg5YHpb1CLMqg8rN8JRKngMfuopxQ7oqewd4TV83jgGsv_KFojAS_98vT4pMOTXmSV3KFVo2TuQW5UDs5NmJYMtSwX1x8MtTdlaF9EPpu58XtCb1n497JKpssuLezIvaeb9o3X7je8NktQBcKeTpEFb9Zx7g.ieVNgJRU0eDFMPi7ndQSLsNJhPKYfmYWhU6OrAYjhdyGLyTGoSzmSJUN3OiRu48rUB1vNA_OmhRjEO8QnMIK6w2r2SR8SIUCr36D3AfLM7Pi8zRcr8xH_D.Lei5YWdPnJG4n6T_FR98Wgz_oWhUUKfr6PuZ1OCszrnnL5.u6jXxBU1T4lhCv.EIVy5itwEeBsxRbiBItTVAT7POzfye4RjfXEyiwOdbA61oIBgbnWJRY9o0l9XqZkE0FM0y6EF6Pe0eMmoK386V1qP1HLkkOKu6eENXxSooG6FinRsPWE",mdrd: "dAQPOjcmv_rE8wIa0ud.tmIpWoMwPqmuDRcIllWxtaE-1742475564-1.2.1.1-w2pWyXRDBufOU6jJz1xqa8gNvacpmJWdoUCltm43eO_xkZjyHhjFJInetu1fLO3hTpwHGb06jcbqEnwhhVbnju2O0dad.k0V.W9Wdj4VPAbwZZWzZ_irIbhpDgZoWG2OfTvIRwC6hQ0kcf6vhI_2mI2cT3XrlnMd_pYGR89ed8Lp7crTrtCaI4Pu9mKVAlPUeqjpRlaq1vGkPQf4Em_2QkZcf52Ex8w_soxQ1MYM6jBhTUk1QLJgzjP2EsEMIif2KhReZAR_4_s8srKbi0QfEH8wQWJJiEPjpE8bUVVWDK4LVd4Y4NXgodAP2v4JPGoSBUaKk4mRlG_4VzR2G_P7xrbC.UqVirU2ubRpheQd_0P7E7V0q0ZCHkilktMOPEU2xVRZNGj6qMPYDOoimIb3TEEXbyARj7ROIX2ibuoshrAjCLbv4NqCrypalE8HHF68TEa2VIm28QxhCuME7TXJsSu91SleUpAykWSgrZrvWyoTngts_Vq4RAxz6il.BdvIT_yAnSihYQJ09dTw7zIOYEaL1nGIv5Q3KeQuJYdMwkPqOZ1DgQKXo73xvod0EP.d8X22hqJJloaPGNxG7x8JeR5jdNkZypWKiieYwuRmsGLI7O1akp9BEz2prrWocudf1zScq7nTbs9OBNhE_UfqKlUCyOQ2DVjK.zSFoKcryJ2GUZ1hDQfcJA9py9.87YwNC03N1zHclYLYpsw65_vafaojj2sggZGF_Q9X5KnU_JhM56uJCb970incPWTlGiyGewMBPMPnqexhlET76ulBBv1wYBfIhrrRzegGUTIhzjvNKUBhPNczKu3jaFmYNxUstBU8ApiwEUMNe0XHRA0uR..Zjfjh7x6Ht_nrKzMxABOMxjlSXglTICMFCbLcLk_gm.2lAt7FMyywlTj1NN93UwCCe_I.s4TdRge7r_ykTWgnNj3kq4t4I4sOSONufC1KVE4d0Sz6ANktuX6C_uMgnF1djDg9f1z_.k5yuSxIeS19wbIr7kCncTsjmionCOTrFaZGYrcbH7vu0C4zjovrt0EcIuDsca0Qu.u5oHAEESf60gC8IiTci5DZXmI9uK0F2Yef7RBDqgc2x0.CmH14jdhQdVEIffYRhb4lg7j7cil67HxweEfHQkIooEllunRUioNYLUh0g06U_fvVIq8GXdY2SlPoDbmMnEHdnH_PZPVWDQwfmhBJyQ3LpRCLp.M55Q.w6Mec5nqTfVG8Yxg5Hm12yFXtgcljfXKNFrnUZFCtlnsbKGyBqIwBHe9X6hpn2cVYyvUy1oZ3BJVEaeALOBw7DsY5bL7z0nIAP9egOxTt9ejNbMehoumaHL9XmDIPG2zEVYO40A1IAcMeXVbQZ9kfi65gjdq_rQLbJyiZkYEv8.aN3.PxBiQBGFk8o3DLDZokxMe7jqGNNXcQQ7xNTpLRXXY5n0TZscwPxHdIiGXelSRmuqJDA0k9v8oeDX9HeNN4CWQHC9rCrZjirNq4IXMqFN66_jIk2L1gRfi1zH8ZExvz9jxLXLUZpMHxKsJ1jmNUQBeO4lwfq_3efK3xcO8N4gTIqO6w_XYIK93L4zPOeR6G_Od.KJW1hxkyyGRgdP7asrfDPbiyFHvMWH4AWp1X8HD7EBXc2qvvb8OZhd1SU2S0u89itVpNNvFHB0k3vHHY3HTu6KfGcgPKPAuChkHhk7FFba.8crkrCVHM5Isksb0_eC.m4F1xjmCpo4EnyEY6wnyJXInSxX25PQbeNrUI39tLEVVmnOTvqXmxVhWzbOM8d2eM0TJo9jhx9SVzdaWwIIT0DQbSxGUgBIzgDi5XljChidnt6vU2x80OE9fh4jLVWx_9m7TOH.KAY9kuttD91yh0pSsvAM4PpgRgW4h3OvVcJZAN6F6xEKXnqEHoltyD7t.6n_YRXDJUS43SuLMVPC.k8sZf0h2V455xVboDp1QAV9dSQxqV0KND5IxmPyLVVeJi1BR1tdk5ik_FzWQ7wiqWhu4ZRlonBBGrdW9CqcWhI3oWGU3QUfbb7HsRHYAIkRsNl7DBxQMt6Wy7CX4CoqzQfFMLOL82xdmxXg"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=923562f78d6e5fc2';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/lightrag\/?__cf_chl_rt_tk=3V5OVaWGCX8Dpbq9oMNvT84NW.vabLCdMCCEAmXTc50-1742475564-1.0.1.1-WGVN61_ftzIajX.jXl2Z2Lmz521yC02TP0daCdJZsII" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>