{"id":12121,"date":"2019-02-27T14:25:38","date_gmt":"2019-02-27T14:25:38","guid":{"rendered":"https:\/\/www.ducanhplus.com\/?p=12121"},"modified":"2022-07-31T14:37:04","modified_gmt":"2022-07-31T07:37:04","slug":"nen-mat-du-lieu-jpg-webp","status":"publish","type":"post","link":"https:\/\/kiencang.net\/nen-mat-du-lieu-jpg-webp\/","title":{"rendered":"Nghi\u00ean c\u1ee9u so s\u00e1nh kh\u1ea3 n\u0103ng n\u00e9n \u1ea3nh m\u1ea5t d\u1eef li\u1ec7u c\u1ee7a \u0111\u1ecbnh d\u1ea1ng JPEG v\u00e0 WebP"},"content":{"rendered":"\n<p>V\u00e0i l\u1eddi c\u1ee7a ng\u01b0\u1eddi d\u1ecbch: \u0111\u00e2y l\u00e0 b\u00e0i vi\u1ebft ch\u1ee9ng minh t\u00ednh hi\u1ec7u qu\u1ea3 v\u1ec1 m\u1eb7t dung l\u01b0\u1ee3ng c\u1ee7a \u1ea3nh WebP so v\u1edbi JPEG. C\u1ee5 th\u1ec3 v\u1edbi m\u1ed9t nh\u00f3m \u1ea3nh ti\u00eau chu\u1ea9n c\u0169ng nh\u01b0 thu th\u1eadp \u0111\u01b0\u1ee3c tr\u00ean m\u1ea1ng, nh\u00f3m t\u00e1c gi\u1ea3 \u0111\u00e3 ch\u1ee9ng minh r\u1eb1ng v\u1edbi hai \u1ea3nh WebP v\u00e0 JPEG c\u00f3 c\u00f9ng ch\u1ea5t l\u01b0\u1ee3ng, \u1ea3nh WebP trung b\u00ecnh c\u00f3 dung l\u01b0\u1ee3ng nh\u1ecf h\u01a1n 25% &#8211; 34%.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_60 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >M\u1ee5c l\u1ee5c<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\" role=\"button\"><label for=\"item-6577d6621a9e7\" ><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input aria-label=\"Toggle\" aria-label=\"item-6577d6621a9e7\"  type=\"checkbox\" id=\"item-6577d6621a9e7\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/kiencang.net\/nen-mat-du-lieu-jpg-webp\/#Gioi_thieu\" title=\"Gi\u1edbi thi\u1ec7u\">Gi\u1edbi thi\u1ec7u<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/kiencang.net\/nen-mat-du-lieu-jpg-webp\/#Phuong_phap_nghien_cuu\" title=\"Ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u\">Ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/kiencang.net\/nen-mat-du-lieu-jpg-webp\/#Bo_du_lieu_anh\" title=\"B\u1ed9 d\u1eef li\u1ec7u \u1ea3nh\">B\u1ed9 d\u1eef li\u1ec7u \u1ea3nh<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/kiencang.net\/nen-mat-du-lieu-jpg-webp\/#Thu_nghiem_1_WebP_va_JPEG_voi_cung_chi_so_SSIM\" title=\"Th\u1eed nghi\u1ec7m 1: WebP v\u00e0 JPEG v\u1edbi c\u00f9ng ch\u1ec9 s\u1ed1 SSIM\">Th\u1eed nghi\u1ec7m 1: WebP v\u00e0 JPEG v\u1edbi c\u00f9ng ch\u1ec9 s\u1ed1 SSIM<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/kiencang.net\/nen-mat-du-lieu-jpg-webp\/#Thu_nghiem_2_Bieu_do_SSIM_va_BPP_cho_anh_WebP_va_JPEG\" title=\"Th\u1eed nghi\u1ec7m 2: Bi\u1ec3u \u0111\u1ed3 SSIM v\u00e0 BPP cho \u1ea3nh WebP v\u00e0 JPEG\">Th\u1eed nghi\u1ec7m 2: Bi\u1ec3u \u0111\u1ed3 SSIM v\u00e0 BPP cho \u1ea3nh WebP v\u00e0 JPEG<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/kiencang.net\/nen-mat-du-lieu-jpg-webp\/#Ket_luan\" title=\"K\u1ebft lu\u1eadn\">K\u1ebft lu\u1eadn<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Gioi_thieu\"><\/span>Gi\u1edbi thi\u1ec7u<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Ch\u00fang t\u00f4i th\u1ef1c hi\u1ec7n so s\u00e1nh \u0111\u00e1nh gi\u00e1 <a href=\"https:\/\/kiencang.net\/dinh-dang-anh-webp\/\" target=\"_blank\" rel=\"noreferrer noopener\">\u1ea3nh WebP<\/a> v\u00e0 JPEG d\u1ef1a tr\u00ean b\u1ed9 m\u00e3 h\u00f3a m\u1edbi m\u00e0 ch\u00fang t\u00f4i ph\u00e1t h\u00e0nh trong <em>libwebp<\/em>. M\u1ee5c ti\u00eau l\u00e0 th\u1ef1c hi\u1ec7n c\u00e1c th\u1eed nghi\u1ec7m l\u1eb7p l\u1ea1i, s\u1eed d\u1ee5ng c\u00f4ng c\u1ee5 s\u1eb5n c\u00f3 v\u00e0 so s\u00e1nh \u1ea3nh n\u00e9n \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u1eeb WebP v\u00e0 JPEG.<\/p>\n\n\n\n<p>Nghi\u00ean c\u1ee9u so s\u00e1nh tr\u01b0\u1edbc \u0111\u00e2y c\u1ee7a ch\u00fang t\u00f4i v\u1ec1 WebP t\u1eadp trung \u0111\u00e1nh gi\u00e1 m\u1ed9t s\u1ed1 l\u01b0\u1ee3ng l\u1edbn \u1ea3nh v\u00e0 \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh tr\u00ean ngu\u1ed3n JPEG thu \u0111\u01b0\u1ee3c qua qu\u00e9t d\u1eef li\u1ec7u t\u1eeb th\u1ebf gi\u1edbi web. JPEG l\u00e0 \u0111\u1ecbnh d\u1ea1ng n\u00e9n m\u1ea5t d\u1eef li\u1ec7u v\u00e0 ki\u1ec3u n\u00e9n c\u00f3 l\u1ecbch s\u1eed l\u00e2u \u0111\u1eddi. Th\u00eam v\u00e0o \u0111\u00f3, ban \u0111\u1ea7u ch\u00fang t\u00f4i s\u1eed d\u1ee5ng Peak Singnal-to-Noise Ration (<a href=\"http:\/\/en.wikipedia.org\/wiki\/Peak_signal-to-noise_ratio\" target=\"_blank\" rel=\"noreferrer noopener\">PSNR<\/a>\/\u0110\u1ec9nh t\u1ef7 l\u1ec7 t\u00edn hi\u1ec7u tr\u00ean t\u1ea1p \u00e2m) l\u00e0m ch\u1ec9 s\u1ed1 \u0111o \u0111\u1ea1c ch\u1ea5t l\u01b0\u1ee3ng. PSNR c\u00f3 m\u1ed9t s\u1ed1 \u0111i\u1ec3m y\u1ebfu k\u00e9m khi s\u1eed d\u1ee5ng l\u00e0m ch\u1ec9 s\u1ed1 \u0111o ch\u1ea5t l\u01b0\u1ee3ng \u1ea3nh. D\u1ef1a tr\u00ean ph\u1ea3n h\u1ed3i t\u1eeb c\u1ed9ng \u0111\u1ed3ng, ch\u00fang t\u00f4i th\u1ef1c hi\u1ec7n th\u1eed nghi\u1ec7m tr\u00ean \u1ea3nh PNG bao g\u1ed3m h\u00ecnh \u1ea3nh c\u00f3 s\u1eb5n trong m\u1ed9t s\u1ed1 b\u1ed9 ki\u1ec3m tra ti\u00eau chu\u1ea9n (standard test suites). Ch\u00fang t\u00f4i s\u1eed d\u1ee5ng Structural Similarity hay c\u00f2n g\u1ecdi l\u00e0 SSIM l\u00e0m ti\u00eau chu\u1ea9n ch\u1ea5t l\u01b0\u1ee3ng trong nghi\u00ean c\u1ee9u n\u00e0y. SSIM \u0111\u01b0\u1ee3c xem l\u00e0 ch\u1ec9 s\u1ed1 t\u1ed1t h\u01a1n \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 ch\u1ea5t l\u01b0\u1ee3ng h\u00ecnh \u1ea3nh.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Phuong_phap_nghien_cuu\"><\/span>Ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Ch\u00fang t\u00f4i m\u00f4 t\u1ea3 hai c\u00e1ch \u0111\u00e1nh gi\u00e1. Trong tr\u01b0\u1eddng h\u1ee3p \u0111\u1ea7u ti\u00ean, ch\u00fang t\u00f4i nghi\u00ean c\u1ee9u kh\u1ea3 n\u0103ng n\u00e9n b\u1ed5 sung m\u00e0 WebP ti\u1ebft ki\u1ec7m \u0111\u01b0\u1ee3c v\u1edbi c\u00f9ng ch\u1ea5t l\u01b0\u1ee3ng nh\u01b0 JPEG. C\u1ee5 th\u1ec3 th\u00ec ch\u00fang t\u00f4i t\u1ea1o ra \u1ea3nh WebP c\u00f3 c\u00f9ng ch\u1ea5t l\u01b0\u1ee3ng (c\u00f9ng ch\u1ec9 s\u1ed1 SSIM) nh\u01b0 \u1ea3nh JPEG v\u00e0 sau \u0111\u00f3 so s\u00e1nh k\u00edch c\u1ee1 file c\u1ee7a WebP v\u00e0 \u1ea3nh JPEG. <\/p>\n\n\n\n<p>Trong tr\u01b0\u1eddng h\u1ee3p th\u1ee9 hai, ch\u00fang t\u00f4i ph\u00e2n t\u00edch SSIM v\u00e0 s\u1ed1 l\u01b0\u1ee3ng b\u00edt tr\u00ean m\u1ed7i pixel (bpp\/bits per pixel) c\u1ee7a WebP v\u00e0 JPEG. C\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y cho th\u1ea5y s\u1ef1 \u0111\u00e1nh \u0111\u1ed5i bi\u1ebfn d\u1ea1ng t\u1ef7 l\u1ec7 (rate-distortion trade off) cho WebP v\u00e0 JPEG.<\/p>\n\n\n\n<p>B\u1ed9 d\u1eef li\u1ec7u cho th\u1eed nghi\u1ec7m n\u00e0y bao g\u1ed3m c\u00e1c \u1ea3nh PNG. C\u00e1c \u1ea3nh n\u00e0y \u0111\u01b0\u1ee3c l\u1ea5y t\u1eeb c\u00e1c b\u1ed9 ki\u1ec3m tra \u1ea3nh ti\u00eau chu\u1ea9n c\u00f4ng khai c\u0169ng nh\u01b0 bao g\u1ed3m m\u1ed9t s\u1ed1 l\u01b0\u1ee3ng l\u1edbn \u1ea3nh PNG qu\u00e9t \u0111\u01b0\u1ee3c t\u1eeb internet.<\/p>\n\n\n\n<p>M\u1ed7i th\u1eed nghi\u1ec7m bao g\u1ed3m vi\u1ec7c ch\u1ea1y m\u1ed9t t\u1eadp h\u1ee3p l\u1ec7nh. Ch\u1ec9 nh\u1eefng c\u00f4ng c\u1ee5 d\u00f2ng l\u1ec7nh (command line) \u0111\u01b0\u1ee3c cung c\u1ea5p c\u00f4ng khai \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng, \u0111i\u1ec1u n\u00e0y l\u00e0 c\u1ea7n thi\u1ebft \u0111\u1ec3 th\u1eed nghi\u1ec7m c\u00f3 kh\u1ea3 n\u0103ng \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n l\u1eb7p l\u1ea1i cho nh\u1eefng ai kh\u00e1c mu\u1ed1n ti\u1ebfn h\u00e0nh. C\u00e1c c\u00f4ng c\u1ee5 d\u00f2ng l\u1ec7nh \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho th\u1eed nghi\u1ec7m n\u00e0y bao g\u1ed3m:<\/p>\n\n\n\n<ul><li><em>identify<\/em> v\u00e0 <em>convert<\/em> l\u00e0 c\u00e1c c\u00f4ng c\u1ee5 d\u00f2ng-l\u1ec7nh n\u1eb1m trong <a href=\"http:\/\/www.imagemagick.org\/\" target=\"_blank\" rel=\"noreferrer noopener\">ImageMagick<\/a>. Ch\u00fang t\u00f4i \u0111\u00e3 s\u1eed d\u1ee5ng phi\u00ean b\u1ea3n 6.5.7 cho ph\u00e2n t\u00edch n\u00e0y. Ch\u00fang t\u00f4i s\u1eed d\u1ee5ng <em>convert<\/em> \u0111\u1ec3 chuy\u1ec3n qua l\u1ea1i gi\u1eefa \u0111\u1ecbnh d\u1ea1ng PNG v\u00e0 PPM. Ch\u00fang t\u00f4i s\u1eed d\u1ee5ng <em>identify<\/em> \u0111\u1ec3 tr\u00edch xu\u1ea5t th\u00f4ng tin chi\u1ec1u r\u1ed9ng v\u00e0 chi\u1ec1u cao c\u1ee7a \u1ea3nh.<\/li><li><a href=\"https:\/\/developers.google.com\/speed\/webp\/docs\/cwebp\" target=\"_blank\" rel=\"noreferrer noopener\">cwebp<\/a> v\u00e0 <a href=\"https:\/\/developers.google.com\/speed\/webp\/docs\/dwebp\" target=\"_blank\" rel=\"noreferrer noopener\">dwebp<\/a> l\u00e0 c\u00f4ng c\u1ee5 d\u00f2ng l\u1ec7nh n\u1eb1m trong th\u01b0 vi\u1ec7n <em>libwebp<\/em> \u0111\u01b0\u1ee3c ch\u00fang t\u00f4i ph\u00e1t h\u00e0nh trong Q1 n\u0103m 2011. Ch\u00fang t\u00f4i s\u1eed d\u1ee5ng th\u01b0 vi\u1ec7n phi\u00ean b\u1ea3n 0.1.2. Ch\u00fang t\u00f4i s\u1eed d\u1ee5ng <em>cwebp<\/em> v\u00e0 <em>dwebp<\/em> \u0111\u1ec3 m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3 c\u00e1c \u1ea3nh WebP. Ch\u00fang t\u00f4i s\u1eed d\u1ee5ng c\u00e1c th\u00f4ng s\u1ed1 m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3 m\u1eb7c \u0111\u1ecbnh c\u1ee7a nh\u1eefng c\u00f4ng c\u1ee5 n\u00e0y.<\/li><li><em>cjpeg<\/em> v\u00e0 <em>djpeg<\/em> l\u00e0 c\u00e1c c\u00f4ng c\u1ee5 d\u00f2ng l\u1ec7nh n\u1eb1m trong th\u01b0 vi\u1ec7n <em>libjpeg<\/em>. Ch\u00fang t\u00f4i s\u1eed d\u1ee5ng phi\u00ean b\u1ea3n 6b c\u1ee7a th\u01b0 vi\u1ec7n. Ch\u00fang t\u00f4i s\u1eed d\u1ee5ng <em>cjpeg<\/em> v\u00e0 <em>djpeg<\/em> \u0111\u1ec3 m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3 \u1ea3nh JPEG. Ch\u00fang t\u00f4i s\u1eed d\u1ee5ng <em>cjpeg<\/em> v\u1edbi c\u1edd <em>-optimize<\/em> \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a cho k\u00edch c\u1ee1 dung l\u01b0\u1ee3ng. Ch\u00fang t\u00f4i thi\u1ebft l\u1eadp t\u1ea5t c\u1ea3 c\u00e1c th\u00f4ng s\u1ed1 kh\u00e1c v\u1edbi c\u00e1c gi\u00e1 tr\u1ecb m\u1eb7c \u0111\u1ecbnh c\u1ee7a ch\u00fang.<\/li><\/ul>\n\n\n\n<p>Ch\u1ea5t l\u01b0\u1ee3ng c\u1ee7a \u1ea3nh \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng SSIM. Nh\u01b0 \u0111\u01b0\u1ee3c l\u01b0u \u00fd t\u1eeb tr\u01b0\u1edbc, SSIM nh\u00ecn chung \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn l\u00e0 ch\u1ec9 s\u1ed1 ch\u1ea5t l\u01b0\u1ee3ng t\u1ed1t h\u01a1n so v\u1edbi PSNR. V\u1edbi c\u00e1ch t\u00ednh ch\u1ec9 s\u1ed1 SSIM, ch\u00fang t\u00f4i \u0111\u00e3 s\u1eed d\u1ee5ng <a href=\"http:\/\/mehdi.rabah.free.fr\/SSIM\/\" target=\"_blank\" rel=\"noreferrer noopener\">tri\u1ec3n khai c\u00f3 s\u1eb5n c\u00f4ng khai trong C++<\/a>. B\u1ea1n \u0111\u1ecdc c\u00f3 th\u1ec3 t\u1ea3i <a href=\"https:\/\/storage.googleapis.com\/downloads.webmproject.org\/webp\/webp_study.tar.gz\" target=\"_blank\" rel=\"noreferrer noopener\">m\u00e3 Python<\/a> ch\u00fang t\u00f4i s\u1eed d\u1ee5ng trong th\u1eed nghi\u1ec7m t\u1eeb kho l\u01b0u tr\u1eef m\u00e3 \u1edf ph\u1ea7n ch\u00fa th\u00edch.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Bo_du_lieu_anh\"><\/span>B\u1ed9 d\u1eef li\u1ec7u \u1ea3nh<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Ch\u00fang t\u00f4i ch\u1ecdn b\u1ed9 d\u1eef li\u1ec7u \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 l\u00e0 c\u00e1c b\u1ed9 ki\u1ec3m tra h\u00ecnh \u1ea3nh ti\u00eau chu\u1ea9n c\u0169ng nh\u01b0 m\u1ed9t t\u1eadp h\u1ee3p l\u1edbn nh\u1eefng \u1ea3nh kh\u00e1c. Danh s\u00e1ch d\u01b0\u1edbi \u0111\u00e2y l\u00e0 b\u1ed9 d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong th\u1eed nghi\u1ec7m.<\/p>\n\n\n\n<ol><li><strong>Lena<\/strong>: v\u1edbi \u1ea3nh <a href=\"http:\/\/en.wikipedia.org\/wiki\/Lenna\" target=\"_blank\" rel=\"noreferrer noopener\">Lenna<\/a> \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i (k\u00edch c\u1ee1 512 x 512 pixle);<\/li><li><strong>Kodak<\/strong>: 24 \u1ea3nh t\u1eeb <a href=\"http:\/\/r0k.us\/graphics\/kodak\/\" target=\"_blank\" rel=\"noreferrer noopener\">b\u1ed9 \u1ea3nh m\u00e0u th\u1eadt c\u1ee7a Kodak<\/a>;<\/li><li><strong>Tecnick<\/strong>: 100 \u1ea3nh t\u1eeb b\u1ed9 s\u01b0u t\u1eadp \u0111\u01b0\u1ee3c cung c\u1ea5p t\u1ea1i trang <a href=\"http:\/\/www.tecnick.com\/public\/code\/cp_dpage.php?aiocp_dp=testimages\">Tecnick.com<\/a>. Ch\u00fang t\u00f4i \u0111\u00e3 s\u1eed d\u1ee5ng 100 \u1ea3nh m\u00e0u RGB c\u00f3 k\u00edch c\u1ee1 nguy\u00ean b\u1ea3n;<\/li><li><strong>\u1ea2nh qu\u00e9t tr\u00ean internet<\/strong>: \u0110\u1ec3 ki\u1ec3m tra s\u1ed1 l\u01b0\u1ee3ng l\u1edbn \u1ea3nh, ch\u00fang t\u00f4i thu th\u1eadp m\u1ed9t m\u1eabu ng\u1eabu nhi\u00ean \u1ea3nh PNG t\u1eeb c\u00f4ng c\u1ee5 t\u00ecm ki\u1ebfm \u1ea3nh c\u1ee7a Google. H\u1ea7u h\u1ebft c\u00e1c \u1ea3nh PNG qu\u00e9t \u0111\u01b0\u1ee3c l\u00e0 icons, \u0111\u1ed3 h\u1ecda, b\u1ea3ng bi\u1ec3u, t\u00e0i li\u1ec7u qu\u00e9t, v\u00e2n v\u00e2n. Tuy nhi\u00ean h\u1ea7u h\u1ebft c\u00e1c \u1ea3nh trong b\u1ed9 ki\u1ec3m tra ti\u00eau chu\u1ea9n l\u00e0 \u1ea3nh ch\u1ee5p, ch\u1ee9 kh\u00f4ng ph\u1ea3i \u0111\u01b0\u1ee3c m\u00e1y t\u00ednh t\u1ea1o ra (nh\u01b0 icon,..). \u0110\u1ec3 l\u00e0m cho b\u1ed9 d\u1eef li\u1ec7u n\u00e0y c\u00f3 m\u1ee9c \u0111\u1ed9 t\u1ef1 nhi\u00ean t\u01b0\u01a1ng t\u1ef1 v\u1edbi b\u1ed9 ki\u1ec3m tra ti\u00eau chu\u1ea9n, ch\u00fang t\u00f4i \u0111\u00e3 ch\u1ea1y m\u1ed9t thu\u1eadt to\u00e1n ph\u00e1t hi\u1ec7n khu\u00f4n m\u1eb7t cho c\u00e1c \u1ea3nh PNG n\u00e0y v\u00e0 ch\u1ec9 \u0111\u00e1nh gi\u00e1 nh\u1eefng \u1ea3nh \u0111\u00f3 (kho\u1ea3ng 11 ng\u00e0n b\u1ee9c) cho th\u1eed nghi\u1ec7m (t\u1ee9c l\u00e0 nh\u1eefng \u1ea3nh v\u01b0\u1ee3t qua \u0111\u01b0\u1ee3c ki\u1ec3m tra ph\u00e1t hi\u1ec7n khu\u00f4n m\u1eb7t).<\/li><\/ol>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Thu_nghiem_1_WebP_va_JPEG_voi_cung_chi_so_SSIM\"><\/span>Th\u1eed nghi\u1ec7m 1: WebP v\u00e0 JPEG v\u1edbi c\u00f9ng ch\u1ec9 s\u1ed1 SSIM<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Trong th\u1eed nghi\u1ec7m n\u00e0y, ch\u00fang t\u00f4i t\u1ea1o ra \u1ea3nh JPEG v\u00e0 WebP v\u1edbi c\u00e1c gi\u00e1 tr\u1ecb SSIM t\u01b0\u01a1ng \u0111\u1ed3ng v\u00e0 \u0111o t\u1ef7 l\u1ec7 k\u00edch th\u01b0\u1edbc file \u1ea3nh c\u1ee7a ch\u00fang. C\u00e1c b\u01b0\u1edbc c\u1ee7a th\u1eed nghi\u1ec7m \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh nh\u01b0 sau:<\/p>\n\n\n\n<ol><li>N\u00e9n \u1ea3nh ngu\u1ed3n PNG sang JPG v\u1edbi tham s\u1ed1 ch\u1ea5t l\u01b0\u1ee3ng c\u1ed1 \u0111\u1ecbnh Q v\u00e0 ghi l\u1ea1i SSIM v\u00e0o gi\u1eefa \u1ea3nh ngu\u1ed3n PNG v\u00e0 \u1ea3nh n\u00e9n JPEG.<\/li><li>N\u00e9n c\u00f9ng ngu\u1ed3n \u1ea3nh sang WebP v\u1edbi tham s\u1ed1 ch\u1ea5t l\u01b0\u1ee3ng \u0111\u1ea1t \u0111\u01b0\u1ee3c SSIM \u0111\u01b0\u1ee3c ghi \u1edf tr\u00ean, c\u00e0ng t\u01b0\u01a1ng \u0111\u1ed3ng v\u1edbi JPEG c\u00e0ng t\u1ed1t.<\/li><\/ol>\n\n\n\n<p>Ch\u00fang t\u00f4i ch\u1ea1y hai b\u01b0\u1edbc tr\u00ean cho t\u1ea5t c\u1ea3 \u1ea3nh trong t\u1ec7p d\u1eef li\u1ec7u v\u00e0 sau \u0111\u00f3 so s\u00e1nh k\u00edch c\u1ee1 file trung b\u00ecnh v\u00e0 SSIM cho \u1ea3nh JPEG v\u00e0 WebP.<\/p>\n\n\n\n<p>B\u1ea3ng b\u00ean d\u01b0\u1edbi cho th\u1ea5y k\u1ebft qu\u1ea3 c\u1ee7a th\u1eed nghi\u1ec7m n\u00e0y v\u1edbi ba gi\u00e1 tr\u1ecb kh\u00e1c nhau (50, 75 v\u00e0 95) c\u1ee7a th\u00f4ng s\u1ed1 ch\u1ea5t l\u01b0\u1ee3ng Q c\u1ee7a JPEG. Ch\u1ec9 s\u1ed1 ch\u1ea5t l\u01b0\u1ee3ng 50 v\u00e0 95 bi\u1ec3u th\u1ecb t\u01b0\u01a1ng \u1ee9ng \u1ea3nh n\u00e9n \u1edf t\u1ef7 l\u1ec7 b\u00edt th\u1ea5p v\u00e0 cao. Ch\u00fang t\u00f4i c\u0169ng bao g\u1ed3m \u1ea3nh c\u00f3 ch\u1ec9 s\u1ed1 ch\u1ea5t l\u01b0\u1ee3ng JPEG 75 v\u00ec \u0111\u00e2y l\u00e0 m\u1ee9c ch\u1ea5t l\u01b0\u1ee3ng th\u01b0\u1eddng \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb cho \u1ea3nh c\u1ee7a JPEG.<\/p>\n\n\n\n<p><strong>B\u1ea3ng 1: K\u00edch c\u1ee1 file trung b\u00ecnh c\u1ee7a WebP v\u00e0 JPEG v\u1edbi c\u00f9ng ch\u1ec9 s\u1ed1 SSIM t\u01b0\u01a1ng \u1ee9ng v\u1edbi JPEG Q=50<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>&nbsp;<\/th><th>Lenna<\/th><th>Kodak<\/th><th>Tecnik<\/th><th>Image_crawl<\/th><\/tr><\/thead><tbody><tr><td>WebP: K\u00edch c\u1ee1 file trung b\u00ecnh<br>(SSIM trung b\u00ecnh)<\/td><td>17.4 KB<br>(0.841)<\/td><td>31.0 KB<br>(0.898)<\/td><td>92.4 KB<br>(0.917)<\/td><td>6.5 KB<br>(0.901)<\/td><\/tr><tr><td>JPEG: K\u00edch c\u1ee1 file trung b\u00ecnh<br>(SSIM trung b\u00ecnh)<\/td><td>23.5 KB<br>(0.840)<\/td><td>42.7 KB<br>(0.897)<\/td><td>124.6 KB<br>(0.916)<\/td><td>9.9 KB<br>(0.899)<\/td><\/tr><tr><td>T\u1ef7 l\u1ec7 k\u00edch c\u1ee1 gi\u1eefa WebP so v\u1edbi JPEG<\/td><td><strong>0.74<\/strong><\/td><td><strong>0.72<\/strong><\/td><td><strong>0.74<\/strong><\/td><td><strong>0.66<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>B\u1ea3ng 2: K\u00edch c\u1ee1 file trung b\u00ecnh c\u1ee7a WebP v\u00e0 JPEG v\u1edbi c\u00f9ng ch\u1ec9 s\u1ed1 SSIM t\u01b0\u01a1ng \u1ee9ng v\u1edbi JPEG Q=75<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>&nbsp;<\/th><th>Lenna<\/th><th>Kodak<\/th><th>Tecnik<\/th><th>Image_crawl<\/th><\/tr><\/thead><tbody><tr><td>WebP: K\u00edch c\u1ee1 file trung b\u00ecnh<br>(SSIM trung b\u00ecnh)<\/td><td>26.7 KB<br>(0.864)<\/td><td>46.5 KB<br>(0.932)<\/td><td>139.0 KB<br>(0.939)<\/td><td>9.9 KB<br>(0.930)<\/td><\/tr><tr><td>JPEG: K\u00edch c\u1ee1 file trung b\u00ecnh<br>(SSIM trung b\u00ecnh)<\/td><td>37.0 KB<br>(0.863)<\/td><td>66.0 KB<br>(0.931)<\/td><td>191.0 KB<br>(0.938)<\/td><td>14.4 KB<br>(0.929)<\/td><\/tr><tr><td>T\u1ef7 l\u1ec7 k\u00edch c\u1ee1 gi\u1eefa WebP so v\u1edbi JPEG<\/td><td><strong>0.72<\/strong><\/td><td><strong>0.70<\/strong><\/td><td><strong>0.73<\/strong><\/td><td><strong>0.69<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>B\u1ea3ng 3: K\u00edch c\u1ee1 file trung b\u00ecnh c\u1ee7a WebP v\u00e0 JPEG v\u1edbi c\u00f9ng ch\u1ec9 s\u1ed1 SSIM t\u01b0\u01a1ng \u1ee9ng v\u1edbi JPEG Q=95<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>&nbsp;<\/th><th>Lenna<\/th><th>Kodak<\/th><th>Tecnik<\/th><th>Image_crawl<\/th><\/tr><\/thead><tbody><tr><td>WebP: K\u00edch c\u1ee1 file trung b\u00ecnh<br>(SSIM trung b\u00ecnh)<\/td><td>74.3 KB<br>(0.910)<\/td><td>118.0 KB<br>(0.978)<\/td><td>356.0 KB<br>(0.970)<\/td><td>23.4 KB<br>(0.969)<\/td><\/tr><tr><td>JPEG: K\u00edch c\u1ee1 file trung b\u00ecnh<br>(SSIM trung b\u00ecnh)<\/td><td>104 KB<br>(0.907)<\/td><td>162 KB<br>(0.976)<\/td><td>492 KB<br>(0.970)<\/td><td>31.3 KB<br>(0.968)<\/td><\/tr><tr><td>T\u1ef7 l\u1ec7 k\u00edch c\u1ee1 gi\u1eefa WebP so v\u1edbi JPEG<\/td><td><strong>0.71<\/strong><\/td><td><strong>0.73<\/strong><\/td><td><strong>0.72<\/strong><\/td><td><strong>0.75<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>T\u1eeb b\u1ea3ng tr\u00ean ch\u00fang ta c\u00f3 th\u1ec3 quan s\u00e1t th\u1ea5y r\u1eb1ng WebP \u0111\u01b0a ra h\u1ec7 s\u1ed1 n\u00e9n t\u1ed1t h\u01a1n t\u1eeb 25-34% so v\u1edbi JPEG v\u1edbi ch\u1ec9 s\u1ed1 SSIM t\u01b0\u01a1ng \u0111\u01b0\u01a1ng ho\u1eb7c t\u1ed1t h\u01a1n m\u1ed9t ch\u00fat.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Thu_nghiem_2_Bieu_do_SSIM_va_BPP_cho_anh_WebP_va_JPEG\"><\/span>Th\u1eed nghi\u1ec7m 2: Bi\u1ec3u \u0111\u1ed3 SSIM v\u00e0 BPP cho \u1ea3nh WebP v\u00e0 JPEG<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Ch\u00fang t\u00f4i nghi\u00ean c\u1ee9u ch\u1ec9 s\u1ed1 m\u00e9o \u0111\u00e1nh \u0111\u1ed5i c\u1ee7a JPEG v\u00e0 WebP. C\u1ee5 th\u1ec3, ch\u00fang t\u00f4i nghi\u00ean c\u1ee9u bi\u1ec3u \u0111\u1ed3 SSIM v\u00e0 s\u1ed1 l\u01b0\u1ee3ng b\u00edt tr\u00ean m\u1ed7i pixel cho \u1ea3nh JPEG v\u00e0 WebP. Ch\u00fang t\u00f4i l\u1ea5y \u1ea3nh ngu\u1ed3n PNG, n\u00e9n n\u00f3 sang JPEG v\u00e0 WebP s\u1eed d\u1ee5ng t\u1ea5t c\u1ea3 gi\u00e1 tr\u1ecb ch\u1ea5t l\u01b0\u1ee3ng c\u00f3 th\u1ec3 (t\u1eeb 0 &#8211; 100). Sau \u0111\u00f3 v\u1edbi m\u1ed7i gi\u00e1 tr\u1ecb ch\u1ea5t l\u01b0\u1ee3ng, ch\u00fang t\u00f4i ph\u00e1c h\u1ecda SSIM v\u00e0 bpp \u0111\u1ea1t \u0111\u01b0\u1ee3c cho JPEG v\u00e0 WebP. C\u00e1c bi\u1ec3u \u0111\u1ed3 b\u00ean d\u01b0\u1edbi cho th\u1ea5y SSIM v\u00e0 bpp cho 3 \u1ea3nh \u0111\u01b0\u1ee3c ch\u1ecdn t\u1eeb 3 b\u1ed9 d\u1eef li\u1ec7u c\u00f4ng khai ch\u00fang t\u00f4i s\u1eed d\u1ee5ng.<\/p>\n\n\n\n<p><strong>H\u00ecnh 1: SSIM v\u00e0 BPP c\u1ee7a Lenna<\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/02\/lenna.png\" alt=\"\u1ea3nh Lenna - s\u1ed1 l\u01b0\u1ee3ng b\u00edt tr\u00ean m\u1ed7i pixel\" class=\"wp-image-12126\"\/><\/figure><\/div>\n\n\n<p><strong>H\u00ecnh 2 2: SSIM v\u00e0 BPP c\u1ee7a \u1ea3nh kodim19.png t\u1eeb d\u1eef li\u1ec7u c\u1ee7a Kodak<\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/02\/kodim19.png\" alt=\"Kodak d\u1eef li\u1ec7u m\u1eabu\" class=\"wp-image-12127\"\/><\/figure><\/div>\n\n\n<p><strong>H\u00ecnh 3: SSIM v\u00e0 BPP c\u1ee7a RGB_OR_1200x1200_061.png t\u1eeb d\u1eef li\u1ec7u Tecnick&nbsp;<\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/02\/tecnick61.png\" alt=\"tecnick\" class=\"wp-image-12128\"\/><\/figure><\/div>\n\n\n<p>Ngo\u00e0i ra, ch\u00fang t\u00f4i c\u0169ng nghi\u00ean c\u1ee9u h\u00e0nh vi trung b\u00ecnh c\u1ee7a SSIM v\u00e0 bpp cho d\u1eef li\u1ec7u Kodak v\u00e0 Tecnick. \u0110\u1ec3 ph\u00e1c h\u1ecda bi\u1ec3u \u0111\u1ed3 cho h\u00e0nh vi trung b\u00ecnh, ch\u00fang t\u00f4i n\u00e9n t\u1ea5t c\u1ea3 \u1ea3nh trong b\u1ed9 d\u1eef li\u1ec7u s\u1eed d\u1ee5ng WebP v\u00e0 JPEG \u1edf 100 gi\u00e1 tr\u1ecb ch\u1ea5t l\u01b0\u1ee3ng kh\u00e1c nhau. Sau \u0111\u00f3 ch\u00fang t\u00f4i ph\u00e1c h\u1ecda gi\u00e1 tr\u1ecb trung b\u00ecnh c\u1ee7a SSIM v\u00e0 bpp cho t\u1eebng gi\u00e1 tr\u1ecb ch\u1ea5t l\u01b0\u1ee3ng. T\u1ec7p qu\u00e9t d\u1eef li\u1ec7u \u1ea3nh bao g\u1ed3m c\u00e1c b\u1ee9c h\u00ecnh kh\u00f4ng \u0111\u1ed3ng nh\u1ea5t kh\u00f4ng \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o d\u1eef li\u1ec7u t\u1ed5ng h\u1ee3p n\u00e0y. Bi\u1ec3u \u0111\u1ed3 b\u00ean d\u01b0\u1edbi cho th\u1ea5y h\u00e0nh vi trung b\u00ecnh c\u1ee7a SSIM v\u00e0 bpp t\u01b0\u01a1ng \u1ee9ng cho Kodak v\u00e0 Tecnick.<\/p>\n\n\n\n<p><strong>H\u00ecnh 4: SSIM v\u00e0 BPP c\u1ee7a b\u1ed9 d\u1eef li\u1ec7u Kodak<\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/02\/kodak.png\" alt=\"kodak\" class=\"wp-image-12129\"\/><\/figure><\/div>\n\n\n<p><strong>H\u00ecnh 5: SSIM v\u00e0 BPP cho t\u1ec7p d\u1eef li\u1ec7u Tecnick<\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/kiencang.net\/wp-content\/uploads\/2022\/07\/tecnick.png\"><img loading=\"lazy\" decoding=\"async\" width=\"576\" height=\"360\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2022\/07\/tecnick.png\" alt=\"SSIM v\u00e0 BPP cho t\u1ec7p d\u1eef li\u1ec7u Tecnick\" class=\"wp-image-22351\" srcset=\"https:\/\/kiencang.net\/wp-content\/uploads\/2022\/07\/tecnick.png 576w, https:\/\/kiencang.net\/wp-content\/uploads\/2022\/07\/tecnick-300x188.png 300w\" sizes=\"(max-width: 576px) 100vw, 576px\" \/><\/a><\/figure><\/div>\n\n\n<p>N\u00f3i t\u00f3m l\u1ea1i, t\u1eeb c\u00e1c bi\u1ec3u \u0111\u1ed3 tr\u00ean ch\u00fang ta c\u00f3 th\u1ec3 nh\u1eadn th\u1ea5y l\u00e0 WebP l\u00fac n\u00e0o c\u0169ng ch\u1ec9 <strong>c\u1ea7n \u00edt b\u00edt (d\u1eef li\u1ec7u) tr\u00ean m\u1ed7i pixel so v\u1edbi JPEG \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c c\u00f9ng ch\u1ec9 s\u1ed1 SSIM (ch\u1ea5t l\u01b0\u1ee3ng \u1ea3nh)<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ket_luan\"><\/span>K\u1ebft lu\u1eadn<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Nghi\u00ean c\u1ee9u \u0111\u00e1nh gi\u00e1 kh\u1ea3 n\u0103ng n\u00e9n c\u1ee7a WebP trong so s\u00e1nh v\u1edbi JPEG. Ch\u00fang t\u00f4i quan s\u00e1t th\u1ea5y trung b\u00ecnh WebP c\u00f3 k\u00edch c\u1ee1 nh\u1ecf h\u01a1n t\u1eeb 25-34% so v\u1edbi \u1ea3nh JPEG v\u1edbi c\u00f9ng ch\u1ec9 s\u1ed1 SSIM (ch\u1ea5t l\u01b0\u1ee3ng \u1ea3nh). Ph\u00e1c \u0111\u1ed3 SSIM v\u00e0 bpp cho th\u1ea5y nh\u1ea5t qu\u00e1n r\u1eb1ng WebP y\u00eau c\u1ea7u \u00edt b\u00edt tr\u00ean m\u1ed7i pixel h\u01a1n so v\u1edbi JPEG v\u1edbi c\u00f9ng ch\u1ec9 s\u1ed1 SSIM. Nh\u1eefng k\u1ebft qu\u1ea3 n\u00e0y ch\u1ec9 ra r\u1eb1ng, WebP c\u00f3 th\u1ec3 cung c\u1ea5p kh\u1ea3 n\u0103ng n\u00e9n t\u1ed1t h\u01a1n \u0111\u00e1ng k\u1ec3 so v\u1edbi JPEG.<\/p>\n\n\n\n<p><em>(D\u1ecbch t\u1eeb b\u00e0i vi\u1ebft WebP Compression Study &#8211; website: Developers Google)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>V\u00e0i l\u1eddi c\u1ee7a ng\u01b0\u1eddi d\u1ecbch: \u0111\u00e2y l\u00e0 b\u00e0i vi\u1ebft ch\u1ee9ng minh t\u00ednh hi\u1ec7u qu\u1ea3 v\u1ec1 m\u1eb7t dung l\u01b0\u1ee3ng c\u1ee7a \u1ea3nh WebP so v\u1edbi JPEG. C\u1ee5 th\u1ec3 v\u1edbi m\u1ed9t nh\u00f3m \u1ea3nh ti\u00eau chu\u1ea9n c\u0169ng nh\u01b0 thu th\u1eadp \u0111\u01b0\u1ee3c tr\u00ean m\u1ea1ng, nh\u00f3m t\u00e1c gi\u1ea3 \u0111\u00e3 ch\u1ee9ng minh r\u1eb1ng v\u1edbi hai \u1ea3nh WebP v\u00e0 JPEG c\u00f3 c\u00f9ng ch\u1ea5t &hellip;<\/p>\n","protected":false},"author":1,"featured_media":20436,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[273,296],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Nghi\u00ean c\u1ee9u so s\u00e1nh kh\u1ea3 n\u0103ng n\u00e9n \u1ea3nh m\u1ea5t d\u1eef li\u1ec7u c\u1ee7a \u0111\u1ecbnh d\u1ea1ng JPEG v\u00e0 WebP &#8226; Ki\u1ebfn c\u00e0ng<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kiencang.net\/nen-mat-du-lieu-jpg-webp\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Nghi\u00ean c\u1ee9u so s\u00e1nh kh\u1ea3 n\u0103ng n\u00e9n \u1ea3nh m\u1ea5t d\u1eef li\u1ec7u c\u1ee7a \u0111\u1ecbnh d\u1ea1ng JPEG v\u00e0 WebP &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"V\u00e0i l\u1eddi c\u1ee7a ng\u01b0\u1eddi d\u1ecbch: \u0111\u00e2y l\u00e0 b\u00e0i vi\u1ebft ch\u1ee9ng minh t\u00ednh hi\u1ec7u qu\u1ea3 v\u1ec1 m\u1eb7t dung l\u01b0\u1ee3ng c\u1ee7a \u1ea3nh WebP so v\u1edbi JPEG. 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