{"id":10662,"date":"2023-12-08T00:44:14","date_gmt":"2023-12-07T16:44:14","guid":{"rendered":"http:\/\/yptk.cn\/?p=10662"},"modified":"2023-12-08T00:44:58","modified_gmt":"2023-12-07T16:44:58","slug":"jpeg%e5%9b%be%e5%83%8f%e5%8e%8b%e7%bc%a9%e5%8e%9f%e7%90%86","status":"publish","type":"post","link":"http:\/\/yptk.cn\/index.php\/2023\/12\/08\/jpeg%e5%9b%be%e5%83%8f%e5%8e%8b%e7%bc%a9%e5%8e%9f%e7%90%86\/","title":{"rendered":"JPEG\u56fe\u50cf\u538b\u7f29\u539f\u7406"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">JPEG \u662f Joint Photographic Experts Group \u7684\u7f29\u5199\uff0c\u5373 ISO \u548c IEC \u8054\u5408\u56fe\u50cf\u4e13\u5bb6\u7ec4\uff0c\u8d1f\u8d23\u9759\u6001\u56fe\u50cf\u538b\u7f29\u6807\u51c6\u7684\u5236\u5b9a\uff0c\u8fd9\u4e2a\u4e13\u5bb6\u7ec4\u5f00\u53d1\u7684\u7b97\u6cd5\u5c31\u88ab\u79f0\u4e3a JPEG \u7b97\u6cd5\u3002\u4f7f\u7528\u8fd9\u4e2a\u7b97\u6cd5\u538b\u7f29\u7684\u56fe\u7247\u5c31\u53eb\u505a.JPEG\/.JPG\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001JPEG\u6838\u5fc3\u539f\u7406<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">JPEG\u6838\u5fc3\u539f\u7406\u662f\u5229\u7528\u4e86\u4eba\u773c\u5bf9\u8272\u5f69\u4e0d\u654f\u611f\uff0c\u4e14\u5bf9\u9ad8\u9891\u4fe1\u606f\u4e0d\u654f\u611f\u7684\u7279\u6027\u3002\u820d\u5f03\u4e86\u4eba\u773c\u4e0d\u6613\u5bdf\u89c9\u5230\u7684\u90e8\u5206\u3002\u56e0\u6b64JPEG\u662f\u6709\u635f\u538b\u7f29\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4eba\u773c\u4e2d\u6709\u4e24\u79cd\u611f\u5149\u7ec6\u80de\uff0c\u89c6\u6746\u7ec6\u80deRods\u548c\u89c6\u9525\u7ec6\u80deCones\u3002\u89c6\u6746\u7ec6\u80de\u5bf9\u660e\u6697\u53d8\u5316\u654f\u611f\uff0c\u5bf9\u989c\u8272\u4e0d\u654f\u611f\uff1b\u89c6\u9525\u7ec6\u80de\u5bf9\u989c\u8272\u654f\u611f\u3002\u6bcf\u53ea\u773c\u775b\u67091\u4ebf\u4e2a\u89c6\u6746\u7ec6\u80de\uff0c\u800c\u89c6\u9525\u7ec6\u80de\u53ea\u6709600\u4e07\u4e2a\u3002\u56e0\u6b64\uff0c\u4eba\u773c\u5bf9\u56fe\u50cf\u7684\u660e\u6697\u7a0b\u5ea6\u7684\u611f\u77e5\u80fd\u529b\u8981\u5f3a\u7684\u591a\u3002<font>\u89c6\u9525\u7ec6\u80de\u8fd8\u53e6\u5916\u5206\u4e3a\u7eff\u7ea2\u84dd\u4e09\u79cd\uff0c\u6bd4\u4f8b\u4e3a40\uff1a20\uff1a1\u3002<\/font>\u56e0\u6b64\u4eba\u773c\u5bf9\u84dd\u5149\u6781\u4e0d\u654f\u611f\u3002\u8fd9\u4e5f\u5bfc\u81f4\u6211\u4eec\u4e0d\u6613\u5bdf\u89c9\u84dd\u5149\u5bf9\u4eba\u773c\u7684\u4f24\u5bb3\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001JPEG\u539f\u7406\u8be6\u7ec6\u5206\u6790<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"520\" height=\"301\" src=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/8f9096133b9e1ff087b51c5c44bb65c9.jpg\" alt=\"\" class=\"wp-image-10749\" srcset=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/8f9096133b9e1ff087b51c5c44bb65c9.jpg 520w, http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/8f9096133b9e1ff087b51c5c44bb65c9-300x174.jpg 300w\" sizes=\"auto, (max-width: 520px) 100vw, 520px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">\u5177\u4f53\u6b65\u9aa4\uff1a<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>DCT (Discrete Cosine Transform \u79bb\u6563\u4f59\u5f26\u53d8\u6362)<\/li>\n\n\n\n<li>Quantization(\u91cf\u5316)<\/li>\n\n\n\n<li>Run Length and Huffman coding\uff08\u6e38\u7a0b\u7f16\u7801\u548c\u970d\u592b\u66fc\u7f16\u7801\uff09<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">1\u3001\u989c\u8272\u7a7a\u95f4\u8f6c\u6362\u3002RGB-&gt;YCbCr<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\u6839\u636e\u4e09\u57fa\u8272\u539f\u7406\uff0c\u4eba\u4eec\u53d1\u73b0\u7ea2\u7eff\u84dd\u4e09\u79cd\u989c\u8272\u6240\u8d21\u732e\u7684\u4eae\u5ea6\u662f\u4e0d\u540c\u7684\uff0c\u7eff\u8272\u7684\u201c\u4eae\u5ea6\u201d\u6700\u5927\uff0c\u84dd\u8272\u6700\u6697\uff0c\u8bbe\u7ea2\u8272\u6240\u8d21\u732e\u7684\u4eae\u5ea6\u7684\u4efd\u989d\u4e3aKR\uff0c\u84dd\u8272\u8d21\u732e\u7684\u4efd\u989d\u4e3aKB\uff0c\u90a3\u4e48\u4eae\u5ea6\u4e3a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"235\" height=\"16\" src=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/11\/jpeg_09.gif\" alt=\"\" class=\"wp-image-10678\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\u6839\u636e\u7ecf\u9a8c\uff0c\u672a\u7ecf\u4f3d\u739b\u6821\u6b63\uff08\u8ba1\u7b97\u673a\u8272\u5f69\u7a7a\u95f4\uff09\u7684\u77e9\u9635\uff0cKR=0.299\uff0cKB=0.114\uff0c\u90a3\u4e48<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"218\" height=\"12\" src=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/11\/jpeg_10.gif\" alt=\"\" class=\"wp-image-10679\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\u84dd\u8272\u548c\u7ea2\u8272\u7684\u8272\u5dee\u7684\u5b9a\u4e49\u5982\u4e0b<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"94\" height=\"36\" src=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/11\/jpeg_11.gif\" alt=\"\" class=\"wp-image-10680\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"96\" height=\"39\" src=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/11\/jpeg_12.gif\" alt=\"\" class=\"wp-image-10681\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\u6700\u7ec8\u53ef\u4ee5\u5f97\u5230RGB\u8f6c\u6362\u4e3aYCbCr\u7684\u6570\u5b66\u516c\u5f0f\u4e3a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"282\" height=\"64\" src=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/11\/jpeg_13.gif\" alt=\"\" class=\"wp-image-10682\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"224\" src=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/11\/jpeg_15-1.jpg\" alt=\"\" class=\"wp-image-10683\" srcset=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/11\/jpeg_15-1.jpg 300w, http:\/\/yptk.cn\/wp-content\/uploads\/2023\/11\/jpeg_15-1-240x180.jpg 240w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"214\" height=\"160\" data-id=\"10684\" src=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/11\/jpeg_16.jpg\" alt=\"\" class=\"wp-image-10684\"\/><figcaption class=\"wp-element-caption\">Y<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"214\" height=\"160\" data-id=\"10685\" src=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/11\/jpeg_17.jpg\" alt=\"\" class=\"wp-image-10685\"\/><figcaption class=\"wp-element-caption\">Cb<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"214\" height=\"160\" data-id=\"10686\" src=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/11\/jpeg_18.jpg\" alt=\"\" class=\"wp-image-10686\"\/><figcaption class=\"wp-element-caption\">Cr<\/figcaption><\/figure>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\u53ef\u4ee5\u660e\u663e\u770b\u5230\uff0c\u4eae\u5ea6\u56fe\u7684\u7ec6\u8282\u66f4\u52a0\u4e30\u5bcc\u3002JPEG\u628a\u56fe\u50cf\u8f6c\u6362\u4e3aYCbCr\u4e4b\u540e\uff0c\u5c31\u53ef\u4ee5\u9488\u5bf9\u6570\u636e\u5f97\u91cd\u8981\u7a0b\u5ea6\u7684\u4e0d\u540c\u505a\u4e0d\u540c\u7684\u5904\u7406\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48JPEG\u4f7f\u7528\u8fd9\u79cd\u989c\u8272\u7a7a\u95f4\u7684\u539f\u56e0\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2\u3001\u8272\u5f69\u4e0b\u91c7\u6837\u3002\u6309\u71674:2:0\u8272\u5ea6\u62bd\u6837<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728 YUV \u91c7\u6837\u7684\u65f6\u5019\u53ef\u4ee5\u5bf9 U\u3001V \u5206\u91cf\u8fdb\u884c\u8272\u5ea6\u91c7\u6837\uff0c\u5728 JPEG \u538b\u7f29\u7b97\u6cd5\u91c7\u7528\u7684\u662f YUV 4:2:0 \u7684\u8272\u5ea6\u62bd\u6837\u65b9\u6cd5\u3002Y\u5206\u91cf\u4e0d\u538b\u7f29\uff0cUV\u5206\u91cf\u5206\u522b\u538b\u7f29\u5230\u539f\u6765\u76841\/4\u3002\u6574\u5f20\u56fe\u5c31\u53d8\u4e3a\u539f\u6765\u76841\/2\u5927\u5c0f\u4e86<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">YCbCr 4:2:0 subsampling<br>For the top row, the CbCr signals of only two pixels are recorded. No CbCr signals are recorded from the pixels in the second row.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"735\" height=\"690\" src=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/video-faq-420-422-colour-sampling_2214-04.jpg\" alt=\"\" class=\"wp-image-10748\" srcset=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/video-faq-420-422-colour-sampling_2214-04.jpg 735w, http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/video-faq-420-422-colour-sampling_2214-04-300x282.jpg 300w\" sizes=\"auto, (max-width: 735px) 100vw, 735px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">3\u3001\u79bb\u6563\u4f59\u5f26\u53d8\u6362\u3002DCT\uff08Discrete Cosine Transform\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">DCT\u662f\u9488\u5bf9\u5206\u91cf\u5355\u72ec\u53bb\u505a\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\u5bf9\u4e8eYCbCr\u7684\u56fe\u7247\uff0c\u6211\u4eec\u5148\u8981\u5bf9Y\u505a\u4e00\u6b21DCT\uff0c\u7136\u540e\u518d\u5bf9Cb\u505a\u4e00\u6b21DCT\uff0c\u6700\u540e\u5bf9Cr\u505a\u4e00\u6b21DCT\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4ee5Y\u5206\u91cf\u4e3a\u4f8b\uff1a<\/strong><br>\u5c06Y\u5206\u91cf\u7684\u50cf\u7d20\u70b9\u6309\u71678&#215;8\u7684\u77e9\u9635\u8fdb\u884c\u5206\u5272<em>\uff0c<\/em>\u6bcf\u4e2a8&#215;8\u662f\u4e00\u4e2aMCU(\u6700\u5c0f\u7f16\u7801\u5355\u5143)\uff0c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">8&#215;8\u7684\u539f\u59cb\u56fe\u50cf\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"295\" height=\"177\" src=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/f54508f6f2f2f749dc0fe463f872f36b.jpg\" alt=\"\" class=\"wp-image-10752\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u63a8\u79fb128\u540e\uff0c\u4f7f\u5176\u8303\u56f4\u53d8\u4e3a -128~127\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"301\" height=\"145\" src=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/3d68aaf3cd0eec26f67cf3129561ee8f.jpg\" alt=\"\" class=\"wp-image-10753\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f7f\u7528\u79bb\u6563\u4f59\u5f26\u53d8\u6362\uff0c\u5e76\u56db\u820d\u4e94\u5165\u53d6\u6700\u63a5\u8fd1\u7684\u6574\u6570\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"308\" height=\"149\" src=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/7d7e62bdf0462df8162371d1397193ed.jpg\" alt=\"\" class=\"wp-image-10754\" srcset=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/7d7e62bdf0462df8162371d1397193ed.jpg 308w, http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/7d7e62bdf0462df8162371d1397193ed-300x145.jpg 300w\" sizes=\"auto, (max-width: 308px) 100vw, 308px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">DCT\u4ece\u9891\u7387\u57df\u6765\u89e3\u91ca\u66f4\u5bb9\u6613\u7406\u89e3\u3002\u5c06\u8fd964\u4e2a\u50cf\u7d20\u70b9\u6309\u7167Y\u503c\u5c55\u5f00\u6210\u4e00\u6761\u51fd\u6570\u66f2\u7ebfF(y)\uff0c\u901a\u8fc7DCT\uff0c\u5c06\u5176\u79bb\u6563\u4e3a64\u4e2a\u4e0d\u540c\u9891\u7387\u7684cosine\u51fd\u6570\u3002\u53d8\u6362\u540e\u7684\u77e9\u9635\u4e0d\u518d\u662f\u4eae\u5ea6\u77e9\u9635\uff0c\u800c\u662f64\u4e2a\u57fa\u7840\u4f59\u5f26\u6ce2\u7684\u7cfb\u6570\u77e9\u9635\uff0c\u537364\u4e2a\u57fa\u7840\u56fe\u50cf\u7684\u7cfb\u6570\u77e9\u9635\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"615\" height=\"135\" src=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/jpeg_24-1.gif\" alt=\"\" class=\"wp-image-10751\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">4\u3001\u91cf\u5316\uff1a<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u91cf\u5316\u8fc7\u7a0b\u5b9e\u9645\u4e0a\u5c31\u662f\u5bf9 DCT \u7cfb\u6570\u7684\u4e00\u4e2a\u4f18\u5316\u8fc7\u7a0b\u3002\u5b83\u662f\u5229\u7528\u4e86\u4eba\u773c\u5bf9\u9ad8\u9891\u90e8\u5206\u4e0d\u654f\u611f\u7684\u7279\u6027\u6765\u5b9e\u73b0\u6570\u636e\u7684\u5927\u5e45\u7b80\u5316\u3002\u91cf\u5316\u8fc7\u7a0b\u662f\u6709\u635f\u8fd0\u7b97\uff0c\u91cf\u5316\u662f\u56fe\u50cf\u8d28\u91cf\u4e0b\u964d\u7684\u6700\u4e3b\u8981\u539f\u56e0\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u91cf\u5316\u8fc7\u7a0b\u5b9e\u9645\u4e0a\u662f\u7b80\u5355\u5730\u628a\u9891\u7387\u9886\u57df\u4e0a\u6bcf\u4e2a\u6210\u4efd\uff0c\u9664\u4ee5\u4e00\u4e2a\u5bf9\u4e8e\u8be5\u6210\u4efd\u7684\u5e38\u6570\uff0c\u4e14\u63a5\u7740\u56db\u820d\u4e94\u5165\u53d6\u6700\u63a5\u8fd1\u7684\u6574\u6570\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u4e3a\u4eba\u773c\u5bf9\u4eae\u5ea6\u4fe1\u53f7\u6bd4\u5bf9\u8272\u5dee\u4fe1\u53f7\u66f4\u654f\u611f\uff0c\u56e0\u6b64\u4f7f\u7528\u4e86\u4e24\u79cd\u91cf\u5316\u8868\uff1a\u4eae\u5ea6\u91cf\u5316\u503c\u548c\u8272\u5dee\u91cf\u5316\u503c\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"331\" height=\"399\" src=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/6778f0a440015d4847cb0aa0d59bffa7.jpg\" alt=\"\" class=\"wp-image-10755\" srcset=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/6778f0a440015d4847cb0aa0d59bffa7.jpg 331w, http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/6778f0a440015d4847cb0aa0d59bffa7-249x300.jpg 249w\" sizes=\"auto, (max-width: 331px) 100vw, 331px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f7f\u7528\u4eae\u5ea6\u91cf\u5316\u77e9\u9635\u5bf9\u524d\u9762\u5f97\u5230\u7684 DCT \u7cfb\u6570\u77e9\u9635\u8fdb\u884c\u91cf\u5316\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\uff0c\u4f7f\u7528\u2212415\uff08DC\u7cfb\u6570\uff09\u4e14\u56db\u820d\u4e94\u5165\u5f97\u5230\u6700\u63a5\u8fd1\u7684\u6574\u6570<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"303\" height=\"52\" src=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/eea063a2bddf2a3dc13e1586b8c50164.jpg\" alt=\"\" class=\"wp-image-10757\" srcset=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/eea063a2bddf2a3dc13e1586b8c50164.jpg 303w, http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/eea063a2bddf2a3dc13e1586b8c50164-300x51.jpg 300w\" sizes=\"auto, (max-width: 303px) 100vw, 303px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u7ec8\uff0c\u6574\u5f20\u8868\u91cf\u5316\u540e\u7684\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"288\" height=\"183\" src=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/3c563b346043b43baea8a1fc05b9c087.jpg\" alt=\"\" class=\"wp-image-10756\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u603b\u4f53\u4e0a\u6765\u8bf4\uff0cDCT \u53d8\u6362\u5b9e\u9645\u662f\u7a7a\u95f4\u57df\u7684\u4f4e\u901a\u6ee4\u6ce2\u5668\u3002\u5bf9 Y \u5206\u91cf\u91c7\u7528\u7ec6\u91cf\u5316\uff0c\u5bf9 UV \u91c7\u7528\u7c97\u91cf\u5316\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u91cf\u5316\u8868\u662f\u63a7\u5236 JPEG \u538b\u7f29\u6bd4\u7684\u5173\u952e\uff0c\u8fd9\u4e2a\u6b65\u9aa4\u9664\u6389\u4e86\u4e00\u4e9b\u9ad8\u9891\u91cf\uff1b\u53e6\u4e00\u4e2a\u91cd\u8981\u539f\u56e0\u662f\u6240\u6709\u56fe\u7247\u7684\u70b9\u4e0e\u70b9\u4e4b\u95f4\u4f1a\u6709\u4e00\u4e2a\u8272\u5f69\u8fc7\u6e21\u7684\u8fc7\u7a0b\uff0c\u5927\u91cf\u7684\u56fe\u50cf\u4fe1\u606f\u88ab\u5305\u542b\u5728\u4f4e\u9891\u7387\u4e2d\uff0c\u7ecf\u8fc7\u91cf\u5316\u5904\u7406\u540e\uff0c\u5728\u9ad8\u9891\u7387\u6bb5\uff0c\u5c06\u51fa\u73b0\u5927\u91cf\u8fde\u7eed\u7684\u96f6\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5\u3001\u201cZ\u201d\u5b57\u5f62\u7f16\u6392<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u91cf\u5316\u540e\u7684\u6570\u636e\uff0c\u6709\u4e00\u4e2a\u5f88\u5927\u7684\u7279\u70b9\uff0c\u5c31\u662f\u76f4\u6d41\u5206\u91cf\u76f8\u5bf9\u4e8e\u4ea4\u6d41\u5206\u91cf\u6765\u8bf4\u8981\u5927\uff0c\u800c\u4e14\u4ea4\u6d41\u5206\u91cf\u4e2d\u542b\u6709\u5927\u91cf\u76840\u3002\u8fd9\u6837\uff0c\u5bf9\u8fd9\u4e2a\u91cf\u5316\u540e\u7684\u6570\u636e\u5982\u4f55\u6765\u8fdb\u884c\u7b80\u5316\uff0c\u4ece\u800c\u518d\u66f4\u5927\u7a0b\u5ea6\u5730\u8fdb\u884c\u538b\u7f29\u5462\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u5c31\u51fa\u73b0\u4e86\u201cZ\u201d\u5b57\u5f62\u7f16\u6392\uff0c\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"316\" height=\"202\" src=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/22870eb862c535515c1273e420914de4.jpg\" alt=\"\" class=\"wp-image-10758\" srcset=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/22870eb862c535515c1273e420914de4.jpg 316w, http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/22870eb862c535515c1273e420914de4-300x192.jpg 300w\" sizes=\"auto, (max-width: 316px) 100vw, 316px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u4e8e\u524d\u9762\u91cf\u5316\u7684\u7cfb\u6570\u6240\u4f5c\u7684 \u201cZ\u201d\u5b57\u5f62\u7f16\u6392\u7ed3\u679c\u5c31\u662f\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5e95\u90e8 \u221226\uff0c\u22123\uff0c0\uff0c\u22123\uff0c\u22123\uff0c\u22126\uff0c2\uff0c\u22124\uff0c1 \u22124\uff0c1\uff0c1\uff0c5\uff0c1\uff0c2\uff0c\u22121\uff0c1\uff0c\u22121\uff0c2\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c\u22121\uff0c\u22121\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0\uff0c0 \u9876\u90e8<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u6837\u505a\u7684\u7279\u70b9\u5c31\u662f\u4f1a\u8fde\u7eed\u51fa\u73b0\u591a\u4e2a0\uff0c\u8fd9\u6837\u5f88\u6709\u5229\u4e8e\u4f7f\u7528\u7b80\u5355\u800c\u76f4\u89c2\u7684\u884c\u7a0b\u7f16\u7801(RLE\uff1aRun Length Coding)\u5bf9\u5b83\u4eec\u8fdb\u884c\u7f16\u7801\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">8\u00d78\u56fe\u50cf\u5757\u7ecf\u8fc7 DCT \u53d8\u6362\u4e4b\u540e\u5f97\u5230\u7684 DC \u76f4\u6d41\u7cfb\u6570\u6709\u4e24\u4e2a\u7279\u70b9\uff0c\u4e00\u662f\u7cfb\u6570\u7684\u6570\u503c\u6bd4\u8f83\u5927\uff0c\u4e8c\u662f\u76f8\u90bb8\u00d78\u56fe\u50cf\u5757\u7684 DC \u7cfb\u6570\u503c\u53d8\u5316\u4e0d\u5927\u3002\u6839\u636e\u8fd9\u4e2a\u7279\u70b9\uff0cJPEG \u7b97\u6cd5\u4f7f\u7528\u4e86\u5dee\u5206\u8109\u51b2\u8c03\u5236\u7f16\u7801\uff08DPCM\uff09\u6280\u672f\uff0c\u5bf9\u76f8\u90bb\u56fe\u50cf\u5757\u4e4b\u95f4\u91cf\u5316 DC \u7cfb\u6570\u7684\u5dee\u503c\uff08Delta\uff09\u8fdb\u884c\u7f16\u7801\u3002\u5373\u5145\u5206\u5229\u7528\u76f8\u90bb\u4e24\u56fe\u50cf\u5757\u7684\u7279\u6027\uff0c\u6765\u518d\u6b21\u7b80\u5316\u6570\u636e\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5373\u4e0a\u9762\u7684 DC \u5206\u91cf-26\uff0c\u9700\u8981\u5355\u72ec\u5904\u7406\u3002\u800c\u5bf9\u4e8e\u5176\u4ed663\u4e2a\u5143\u7d20\u91c7\u7528zig-zag\uff08\u201cZ\u201d\u5b57\u5f62\uff09\u884c\u7a0b\u7f16\u7801\uff0c\u4ee5\u589e\u52a0\u884c\u7a0b\u4e2d\u8fde\u7eed0\u7684\u4e2a\u6570\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">6\u3001\u884c\u7a0b\u7f16\u7801<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Run Length Coding\uff0c\u884c\u7a0b\u7f16\u7801\u53c8\u79f0\u201c\u8fd0\u884c\u957f\u5ea6\u7f16\u7801\u201d\u6216\u201c\u6e38\u7a0b\u7f16\u7801\u201d\uff0c\u5b83\u662f\u4e00\u79cd\u65e0\u635f\u538b\u7f29\u7f16\u7801\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u5982\uff1a5555557777733322221111111<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u6570\u636e\u7684\u4e00\u4e2a\u7279\u70b9\u662f\u76f8\u540c\u7684\u5185\u5bb9\u4f1a\u91cd\u590d\u51fa\u73b0\u5f88\u591a\u6b21\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u7528\u4e00\u79cd\u7b80\u5316\u7684\u65b9\u6cd5\u6765\u8bb0\u5f55\u8fd9\u4e00\u4e32\u6570\u5b57\uff0c\u5982<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uff085\uff0c6\uff09\uff087\uff0c5\uff09\uff083\uff0c3\uff09\uff082\uff0c4\uff09\uff08l\uff0c7\uff09<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5373\u4e3a\u5b83\u7684\u884c\u7a0b\u7f16\u7801\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u884c\u7a0b\u7f16\u7801\u7684\u4f4d\u6570\u4f1a\u8fdc\u8fdc\u5c11\u4e8e\u539f\u59cb\u5b57\u7b26\u4e32\u7684\u4f4d\u6570\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u7ecf\u8fc7\u201cZ\u201d\u5b57\u5f62\u7f16\u6392\u8fc7\u7684\u6570\u636e\uff0c\u5373\u53ef\u4ee5\u7528\u884c\u7a0b\u7f16\u7801\u6765\u5bf9\u5176\u8fdb\u884c\u5927\u5e45\u5ea6\u7684\u6570\u636e\u538b\u7f29\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u4eec\u6765\u7528\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\u6765\u8be6\u7ec6\u8bf4\u660e\u4e00\u4e0b\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">57\uff0c45\uff0c0\uff0c0\uff0c0\uff0c0\uff0c23\uff0c0\uff0c-30\uff0c-16\uff0c0\uff0c0\uff0c1\uff0c0\uff0c0\uff0c0\uff0c0 \uff0c0 \uff0c0 \uff0c0\uff0c..\uff0c0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\u8868\u793a\u4e3a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">(0\uff0c57) ; (0\uff0c45) ; (4\uff0c23) ; (1\uff0c-30) ; (0\uff0c-16) ; (2\uff0c1) ; EOB <br>\u970d\u592b\u66fc\u7f16\u7801\u4e2d\uff0c\u5728 JPEG \u6709\u4e2a EOB\uff08End Of Block\uff09 \u5b57\u6bb5\uff0c\u8868\u793a\u4ece\u5b57\u6bb5\u5f00\u59cb\u540e\u9762\u5168\u4e3a0\uff0c\u7136\u540e\u518d\u6839\u636e\u970d\u592b\u66fc\u7f16\u7801\u518d\u8fdb\u884c\u538b\u7f29\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5373\u6bcf\u7ec4\u6570\u5b57\u7684\u5934\u4e00\u4e2a\u8868\u793a0\u7684\u4e2a\u6570\uff0c\u800c\u4e14\u4e3a\u4e86\u80fd\u66f4\u6709\u5229\u4e8e\u540e\u7eed\u7684\u5904\u7406\uff0c\u5fc5\u987b\u662f 4 bit\uff0c\u5c31\u662f\u8bf4\uff0c\u53ea\u80fd\u662f 0~15\uff0c\u8fd9\u662f\u7684\u8fd9\u4e2a\u884c\u7a0b\u7f16\u7801\u7684\u4e00\u4e2a\u7279\u70b9\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">7\u3001\u8303\u5f0f Huffman \u7f16\u7801<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u76f4\u6d41 DC \u7cfb\u6570\u7ecf\u8fc7\u4e0a\u9762\u7684 DPCM \u7f16\u7801\uff0c\u4ea4\u6d41 AC \u7cfb\u6570\u7ecf\u8fc7 RLE \u7f16\u7801\u540e\uff0c\u5f97\u5230\u7684\u6570\u636e\uff0c\u8fd8\u53ef\u4ee5\u518d\u8fdb\u4e00\u8865\u538b\u7f29\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9zigzag\u626b\u63cf\u540e\u7684RLE\u8fdb\u884c<strong>\u71b5\u7f16\u7801<\/strong>\uff0c\u6bd4\u8f83\u5178\u578b\u7684\u662f\u91c7\u7528<strong>huffman\u7f16\u7801<\/strong>\uff0c<strong>huffman\u7f16\u7801\u662f\u4e00\u79cd\u53d8\u957f\u7f16\u7801\uff0c\u4e5f\u5c31\u662f\u9ad8\u6982\u7387\u51fa\u73b0\u7684\u7801\u5b57\u4f7f\u7528\u77ed\u7f16\u7801\uff0c\u4f4e\u6982\u7387\u51fa\u73b0\u7684\u7801\u5b57\u4f7f\u7528\u957f\u7f16\u7801\u3002<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u662f\u53cc\u5e73\u9762\u8272\u5f69\u683c\u5f0f\uff08Y\u548cCrCb\uff09\uff08\u9700\u8981\u770b\u8d44\u6599\u786e\u8ba4\u662f\u5426\u548c\u5e73\u9762\u6709\u5173\uff09\uff0c\u4e00\u822cJFIF\u7684Huffman table\u67094\u5f20<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><div id=\"root\"><div class=\"App\"><main role=\"main\" class=\"App-main\"><div class=\"Post-content\" data-zop-usertoken=\"{&quot;userToken&quot;:&quot;yun-po-tian-kai-24&quot;}\" data-zop=\"{&quot;authorName&quot;:&quot;\u6587\u8718\u86db&quot;,&quot;itemId&quot;:600252083,&quot;title&quot;:&quot;JPEG\u7f16\u7801\u539f\u7406&quot;,&quot;type&quot;:&quot;article&quot;}\" data-za-detail-view-path-module=\"PostItem\" data-za-extra-module=\"{&quot;card&quot;:{&quot;content&quot;:{&quot;type&quot;:&quot;Post&quot;,&quot;token&quot;:&quot;600252083&quot;}}}\"><article class=\"Post-Main Post-NormalMain\" tabindex=\"-1\"><div class=\"Post-RichTextContainer\"><div class=\"css-1yuhvjn\"><div class=\"css-376mun\"><div class=\"RichText ztext Post-RichText css-117anjg\"><p data-pid=\"85_tocLa\">Y\u7684DC\u8868<\/p><\/div><\/div><\/div><\/div><\/article><\/div><\/main><\/div><\/div>Y\u7684AC\u8868<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CrCb\u7684DC\u8868<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CrCb\u7684AC\u8868<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u4eec\u9700\u8981\u4f7f\u7528\u5bf9\u5e94\u7684Huffman table\u6765\u5bf9RLE\u8fdb\u884c\u7f16\u7801\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u4e8e8*8 block\uff08MCU\uff09\u6765\u8bf4\uff0c\u6700\u5de6\u4e0a\u89d2\u7684\u662fDC\u56e0\u5b50\uff0c\u5176\u4f5963\u4e2a\u90fd\u662fAC\u56e0\u5b50\uff0c\u56e0\u6b64\u5728RLE\u4e2d\uff0c\u7b2c\u4e00\u4e2a\u5143\u7d20\u5fc5\u7136\u662fDC\u56e0\u5b50\uff0c\u5982\u679c\u8fd9\u4e2aRLE\u4fdd\u5b58\u7684\u662fY\u6570\u636e\uff0c\u90a3\u4e48\u5c31\u8981\u7528Huffman table\uff08Y DC\uff09\u6765\u7f16\u7801\uff0c\u4e0b\u9762\u8bb2\u8ff0\u4e00\u4e0b\u7f16\u7801\u8fc7\u7a0b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u8c08Huffman\u7f16\u7801\u524d\u5148\u8981\u5f15\u5165\u4e00\u4e2aCatagory Value Table\uff08CVT\uff09<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"532\" height=\"453\" src=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/88d507005370843b10ea5c12ed00154f.jpg\" alt=\"\" class=\"wp-image-10762\" srcset=\"http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/88d507005370843b10ea5c12ed00154f.jpg 532w, http:\/\/yptk.cn\/wp-content\/uploads\/2023\/12\/88d507005370843b10ea5c12ed00154f-300x255.jpg 300w\" sizes=\"auto, (max-width: 532px) 100vw, 532px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d RLC \u540e\u7684\u7ed3\u679c\uff0c\u5bf9\u5b83\u7684\u5b58\u50a8\uff0cJPEG \u91cc\u5e76\u4e0d\u76f4\u63a5\u4fdd\u5b58\u8fd9\u4e2a\u6570\u503c\uff0c\u8fd9\u6837\u4e3b\u8981\u662f\u4e3a\u4e86\u63d0\u9ad8\u6548\u7387\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd8\u662f\u4ee5\uff080\uff0c57\uff09\u8fd9\u4e2apair\u4e3a\u4f8b\uff0c\u9700\u8981\u5148\u5c0657\u653e\u5230CVT\u91cc\u9762\uff0c\u8fd9\u6837\u5c31\u5f97\u523057\u5bf9\u5e94\u7684Catagory\uff08\u7ec4\uff09\u548cbits of value\uff08\u5b9e\u9645\u4fdd\u5b58\u503c\uff09<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">57 \u4e3a\u7b2c 6 \u7ec4\u7684\uff0c\u5b9e\u9645\u4fdd\u5b58\u503c\u4e3a 111001\uff0c\u7f16\u7801\u4e3a (6\uff0c111001)\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5907\u6ce8\uff1acatagory=6\uff0c bits=111001\uff0c6\u8868\u793abits\u67096\u4f4d\uff0c\u800cbits=111001\u5219\u662f\u4e8c\u8fdb\u5236\u768457\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u540c\u7406\uff0c<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>57 -&gt; (6, 111001)   \n45 -&gt; (6,101101) \n23  -&gt;  (5,10111) \n-30  -&gt;  (5,00001) \n-8  -&gt;  (4,0111) \n1  -&gt;  (1,1)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u65f6\u5019\u524d\u9762\u7684\u4f8b\u5b50\u5c31\u53d8\u4e3a\u5982\u4e0b\u683c\u5f0f\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">(0\uff0c6)\uff0c111001 ; (0\uff0c6)\uff0c101101 ; (4\uff0c5)\uff0c10111; (1\uff0c5)\uff0c00001; (0\uff0c4) \uff0c0111 ; (2\uff0c1)\uff0c1 ; (0\uff0c0)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u6837\uff0c\u62ec\u53f7\u91cc\u7684\u6570\u503c\u6b63\u597d\u518d\u5408\u6210\u4e00\u4e2a\u5b57\u8282\uff0c\u9ad84\u4f4d\u662f\u524d\u97620\u7684\u4e2a\u6570\uff0c\u4f4e4\u4f4d\u63cf\u8ff0\u4e86\u540e\u9762\u6570\u5b57\u7684\u4f4d\u6570\uff1b\u540e\u9762\u88ab\u7f16\u7801\u7684\u6570\u5b57\u8868\u793a\u8303\u56f4\u662f -32767..32767\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd8\u662f\u4ee5\uff080\uff0c6\uff09\uff0c111001 \u4e3a\u4f8b\uff0c\uff080\uff0c6\uff09\u4e2d\u76840\u653e\u5728\u9ad84bit\uff0c6\u653e\u5728\u4f4e4bit\uff0c\u7ec4\u5408\u8d77\u6765\u5c31\u662f\u4e00\u4e2a8bit\u7684 0000 0110 -&gt; 6\uff0c\u7136\u540e\u5728<strong>Huffman Table<\/strong>\u627e\u5230 \u7801\u5b576 \u5bf9\u5e94\u7684 \u4e8c\u8fdb\u5236\u7f16\u7801(huffman code)\uff0c\u5047\u5982\u8fd9\u91cc 6 -&gt; 111000\uff0c\u5219 \uff080\uff0c6\uff09\uff0c111001 \u6700\u7ec8\u7684\u7f16\u7801\u662f 111000 111001<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u540c\u7406\uff0c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">6 = \uff080\uff0c6\uff09 &#8212; 111000<br>6 = \uff080\uff0c6\uff09 &#8212; 111000<br>69 = (4\uff0c5) (for example) we have 1111111110011001<br>21 = (1\uff0c5) &#8212; 11111110110<br>4 = (0\uff0c4) &#8212; 1011<br>33 = (2\uff0c1) &#8212; 11011<br>0 = EOB = (0\uff0c0) &#8212; 1010<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\u6700\u7ec8\u7684\u7f16\u7801\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>111000 111001  111000 101101  1111111110011001 10111   11111110110  00001  1011 0111   11011 1   1010<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><br>\u53c2\u8003\u94fe\u63a5\uff1a<br><a href=\"https:\/\/blog.csdn.net\/han2529386161\/article\/details\/109777211\">https:\/\/blog.csdn.net\/han2529386161\/article\/details\/109777211<\/a><br><a href=\"https:\/\/zhuanlan.zhihu.com\/p\/600252083\">https:\/\/zhuanlan.zhihu.com\/p\/600252083<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>JPEG \u662f Joint Photographic Experts Group \u7684\u7f29\u5199\uff0c\u5373 ISO \u548c IEC \u8054\u5408\u56fe\u50cf\u4e13\u5bb6\u7ec4\uff0c\u8d1f\u8d23\u9759\u6001\u56fe\u50cf\u538b\u7f29\u6807\u51c6\u7684\u5236\u5b9a\uff0c\u8fd9\u4e2a\u4e13\u5bb6\u7ec4\u5f00\u53d1\u7684\u7b97\u6cd5\u5c31\u88ab\u79f0\u4e3a JPEG \u7b97\u6cd5\u3002\u4f7f\u7528\u8fd9\u4e2a\u7b97\u6cd5\u538b\u7f29\u7684\u56fe\u7247\u5c31\u53eb\u505a.JPEG\/.JPG\u3002 \u4e00\u3001JPEG\u6838\u5fc3\u539f\u7406 JPEG\u6838\u5fc3\u539f\u7406\u662f\u5229\u7528\u4e86\u4eba\u773c\u5bf9\u8272\u5f69\u4e0d\u654f\u611f\uff0c\u4e14\u5bf9\u9ad8\u9891\u4fe1\u606f\u4e0d\u654f\u611f\u7684\u7279\u6027\u3002\u820d\u5f03\u4e86\u4eba\u773c\u4e0d\u6613\u5bdf\u89c9\u5230\u7684\u90e8\u5206\u3002\u56e0\u6b64JPEG\u662f\u6709\u635f\u538b\u7f29\u3002 \u4eba [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","footnotes":""},"categories":[9],"tags":[452,458,459],"class_list":["post-10662","post","type-post","status-publish","format-standard","hentry","category-camera","tag-camera","tag-jpeg","tag-459"],"_links":{"self":[{"href":"http:\/\/yptk.cn\/index.php\/wp-json\/wp\/v2\/posts\/10662","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/yptk.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/yptk.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/yptk.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/yptk.cn\/index.php\/wp-json\/wp\/v2\/comments?post=10662"}],"version-history":[{"count":0,"href":"http:\/\/yptk.cn\/index.php\/wp-json\/wp\/v2\/posts\/10662\/revisions"}],"wp:attachment":[{"href":"http:\/\/yptk.cn\/index.php\/wp-json\/wp\/v2\/media?parent=10662"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/yptk.cn\/index.php\/wp-json\/wp\/v2\/categories?post=10662"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/yptk.cn\/index.php\/wp-json\/wp\/v2\/tags?post=10662"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}