\u4ec0\u9ebc\u662f\u7121\u640d\u58d3\u7e2e\uff1f<\/h3>\n
\u7121\u640d\u58d3\u7e2e\u900f\u904e\u8b58\u5225\u548c\u6d88\u9664\u7d71\u8a08\u5197\u9918\u4f86\u6e1b\u5c0f\u6a94\u6848\u5927\u5c0f\uff0c\u800c\u4e0d\u522a\u9664\u4efb\u4f55\u8cc7\u8a0a\u3002\u89e3\u58d3\u7e2e\u5f8c\uff0c\u8a72\u6587\u4ef6\u8207\u539f\u59cb\u6587\u4ef6\u9010\u4f4d\u76f8\u540c\uff0c\u54c1\u8cea\u6216\u8cc7\u6599\u5b8c\u6574\u6027\u7d55\u5c0d\u6c92\u6709\u640d\u5931\u3002<\/p>\n <\/div>\n <\/div>\n \n
\u7121\u640d\u58d3\u7e2e\u7684\u5de5\u4f5c\u539f\u7406<\/h3>\n
\u7121\u640d\u58d3\u7e2e\u6f14\u7b97\u6cd5\u4f7f\u7528\u5404\u7a2e\u6280\u8853\u4f86\u6e1b\u5c0f\u6a94\u6848\u5927\u5c0f\uff0c\u540c\u6642\u78ba\u4fdd\u539f\u59cb\u8cc7\u6599\u7684\u5b8c\u7f8e\u91cd\u5efa\u3002\u9019\u4e9b\u65b9\u6cd5\u5206\u6790\u8cc7\u6599\u4e2d\u7684\u6a21\u5f0f\u3001\u983b\u7387\u548c\u7d50\u69cb\uff0c\u4ee5\u4fbf\u66f4\u6709\u6548\u5730\u5c0d\u5176\u9032\u884c\u7de8\u78bc\uff0c\u800c\u4e0d\u6703\u907a\u5931\u8cc7\u8a0a\u3002<\/p>\n \n
\u904a\u7a0b\u7de8\u78bc (RLE)<\/h4>\n
RLE \u4ee5\u55ae\u4e00\u503c\u548c\u8a08\u6578\u53d6\u4ee3\u76f8\u540c\u8cc7\u6599\u5143\u7d20\uff08\u904a\u7a0b\uff09\u7684\u5e8f\u5217\u3002\u4f8b\u5982\uff0c\u201cAAAAAABBBCCCCC\u201d\u8b8a\u6210\u201c6A3B5C\u201d\uff0c\u986f\u8457\u6e1b\u5c11\u4e86\u5177\u6709\u8a31\u591a\u91cd\u8907\u5e8f\u5217\u7684\u8cc7\u6599\u7684\u5927\u5c0f\u3002<\/p>\n
Original: WWWWWWWWWWBBBWWWWWWWWWWWWBBBWWWWWWWWWW\nCompressed: 10W3B12W3B10W<\/pre>\n <\/div>\n <\/div>\n \n\n\n <\/i>\n <\/div>\n\u970d\u592b\u66fc\u7de8\u78bc<\/h4>\n
\u6b64\u6280\u8853\u70ba\u8f38\u5165\u5b57\u5143\u5206\u914d\u53ef\u8b8a\u9577\u5ea6\u4ee3\u78bc\uff0c\u5c0d\u65bc\u66f4\u983b\u7e41\u7684\u5b57\u5143\u4f7f\u7528\u8f03\u77ed\u7684\u4ee3\u78bc\u3002\u9019\u7a2e\u7d71\u8a08\u65b9\u6cd5\u6839\u64da\u5b57\u5143\u983b\u7387\u5206\u4f48\u512a\u5316\u7de8\u78bc\u3002<\/p>\n
\n \u7bc4\u4f8b\uff1a<\/strong>\nFrequent character 'e': 101\nLess frequent 'z': 1010101011<\/pre>\n <\/div>\n <\/div>\n \n\n\n <\/i>\n <\/div>\nLZ77 \u548c LZ78 \u6f14\u7b97\u6cd5<\/h4>\n
\u9019\u4e9b\u57fa\u65bc\u5b57\u5178\u7684\u65b9\u6cd5\u900f\u904e\u5c0d\u672a\u58d3\u7e2e\u6d41\u4e2d\u5df2\u5b58\u5728\u7684\u55ae\u4e00\u526f\u672c\u7684\u5f15\u7528\u4f86\u66ff\u63db\u91cd\u8907\u51fa\u73fe\u7684\u8cc7\u6599\u3002\u5b83\u5011\u69cb\u6210\u4e86 ZIP \u548c GIF \u7b49\u6d41\u884c\u683c\u5f0f\u7684\u57fa\u790e\u3002<\/p>\n
\n \u7bc4\u4f8b\uff1a<\/strong>\nInstead of storing \"compression compression\"\nStore \"compression [pointer to earlier instance]\"<\/pre>\n <\/div>\n <\/div>\n \n\n\n <\/i>\n <\/div>\n\u653e\u6c23\u6f14\u7b97\u6cd5<\/h4>\n
Deflate \u7d50\u5408\u4e86 LZ77 \u548c Huffman \u7de8\u78bc\uff0c\u63d0\u4f9b\u4e86\u51fa\u8272\u7684\u58d3\u7e2e\u548c\u826f\u597d\u7684\u901f\u5ea6\u3002\u5b83\u7528\u65bc ZIP\u3001PNG \u548c HTTP \u58d3\u7e2e (gzip)\uff0c\u4f7f\u5176\u6210\u70ba\u90e8\u7f72\u6700\u5ee3\u6cdb\u7684\u6f14\u7b97\u6cd5\u4e4b\u4e00\u3002<\/p>\n
\n \u61c9\u7528\uff1a<\/strong>\n\n
- ZIP \u6a94\u6848<\/li>\n
- PNG \u5f71\u50cf<\/li>\n
- HTTP \u58d3\u7e2e (gzip)<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n
\n\n <\/i>\n <\/div>\n\u7b97\u8853\u7de8\u78bc<\/h4>\n
\u8a72\u6280\u8853\u5c07\u8a0a\u606f\u8868\u793a\u70ba 0 \u5230 1 \u4e4b\u9593\u7684\u6578\u5b57\u7bc4\u570d\u3002\u5b83\u53ef\u4ee5\u5be6\u73fe\u63a5\u8fd1\u7406\u8ad6\u71b5\u6975\u9650\u7684\u58d3\u7e2e\u6bd4\uff0c\u4f7f\u5176\u5c0d\u65bc\u67d0\u4e9b\u985e\u578b\u7684\u8cc7\u6599\u975e\u5e38\u6709\u6548\u7387\u3002<\/p>\n
\n \u512a\u9ede\uff1a<\/strong>\n\u53ef\u4ee5\u5c0d\u6bcf\u500b\u7b26\u865f\u7684\u5c0f\u6578\u4f4d\u9032\u884c\u7de8\u78bc\uff0c\u70ba\u8a31\u591a\u4f86\u6e90\u63d0\u4f9b\u6bd4\u970d\u592b\u66fc\u66f4\u597d\u7684\u58d3\u7e2e\u3002<\/p>\n <\/div>\n <\/div>\n \n
\n\n <\/i>\n <\/div>\n\u589e\u91cf\u7de8\u78bc<\/h4>\n
\u589e\u91cf\u7de8\u78bc\u4e0d\u662f\u5132\u5b58\u7d55\u5c0d\u503c\uff0c\u800c\u662f\u5132\u5b58\u9023\u7e8c\u503c\u4e4b\u9593\u7684\u5dee\u7570\u3002\u9019\u5c0d\u65bc\u76f8\u9130\u503c\u76f8\u4f3c\u7684\u6578\u64da\u7279\u5225\u6709\u6548\uff0c\u4f8b\u5982\u97f3\u8a0a\u6a23\u672c\u6216\u611f\u6e2c\u5668\u8b80\u6578\u3002<\/p>\n
\n \u7bc4\u4f8b\uff1a<\/strong>\nOriginal: 105, 107, 106, 110, 108\nDelta: 105, +2, -1, +4, -2<\/pre>\n <\/div>\n <\/div>\n <\/div>\n \n\u5e38\u898b\u7684\u7121\u640d\u6587\u4ef6\u683c\u5f0f<\/h3>\n
\n\n\n <\/i>\n\u6a94\u6848<\/h4>\n <\/div>\n
\n\u90f5\u905e\u5340\u865f<\/div>\nRAR<\/div>\n7Z<\/div>\n\u5ee3\u5dde\u90f5\u905e\u5340\u865f<\/div>\nBZIP2<\/div>\n\u5854\u723e<\/div>\n <\/div>\n <\/div>\n \n\n\n <\/i>\n\u5716\u7247<\/h4>\n <\/div>\n
\n\u5df4\u5e03\u4e9e\u7d10\u5e7e\u5167\u4e9e<\/div>\nTIFF<\/div>\n\u9aa8\u5f62\u614b\u767c\u751f\u86cb\u767d<\/div>\n\u52d5\u5716<\/div>\nWebP\uff08\u7121\u640d\uff09<\/div>\n <\/div>\n <\/div>\n \n\n\n <\/i>\n\u97f3\u8a0a<\/h4>\n <\/div>\n
\nFLAC<\/div>\nALAC<\/div>\n\u97f3\u8a0a\u683c\u5f0f<\/div>\n\u6025\u6027\u80ba\u640d\u50b7<\/div>\n\u6ce2\u5f62\u5305<\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/section>\n \n \n\n \u6709\u640d\u58d3\u7e2e\u89e3\u91cb<\/h2>\n \n
\n\n\n <\/i>\n <\/div>\n\n\u4ec0\u9ebc\u662f\u6709\u640d\u58d3\u7e2e\uff1f<\/h3>\n
\u6709\u640d\u58d3\u7e2e\u900f\u904e\u6c38\u4e45\u6d88\u9664\u67d0\u4e9b\u8cc7\u8a0a\uff08\u5c24\u5176\u662f\u5197\u9918\u6216\u611f\u89ba\u4e0d\u592a\u91cd\u8981\u7684\u8cc7\u6599\uff09\u4f86\u6e1b\u5c11\u6a94\u6848\u5927\u5c0f\u3002\u89e3\u58d3\u7e2e\u5f8c\u7684\u6587\u4ef6\u8207\u539f\u59cb\u6587\u4ef6\u4e0d\u540c\uff0c\u4f46\u9019\u7a2e\u5dee\u7570\u88ab\u8a2d\u8a08\u6210\u4eba\u985e\u5728\u6b63\u5e38\u689d\u4ef6\u4e0b\u5f88\u96e3\u6216\u4e0d\u53ef\u80fd\u5bdf\u89ba\u3002<\/p>\n <\/div>\n <\/div>\n \n
\u6709\u640d\u58d3\u7e2e\u7684\u5de5\u4f5c\u539f\u7406<\/h3>\n
\u6709\u640d\u58d3\u7e2e\u900f\u904e\u505a\u51fa\u6709\u95dc\u4e1f\u68c4\u54ea\u4e9b\u8cc7\u6599\u7684\u7b56\u7565\u6c7a\u7b56\u4f86\u5be6\u73fe\u986f\u8457\u66f4\u9ad8\u7684\u58d3\u7e2e\u6bd4\u3002\u9019\u4e9b\u6f14\u7b97\u6cd5\u5229\u7528\u6709\u95dc\u4eba\u985e\u611f\u77e5\u7684\u77e5\u8b58\uff08\u6211\u5011\u7684\u773c\u775b\u548c\u8033\u6735\u53ef\u4ee5\u6aa2\u6e2c\u5230\u4ec0\u9ebc\u548c\u4e0d\u80fd\u6aa2\u6e2c\u5230\u4ec0\u9ebc\uff09\uff0c\u4ee5\u6700\u5927\u7a0b\u5ea6\u5730\u6e1b\u5c11\u5c0d\u54c1\u8cea\u7684\u660e\u986f\u5f71\u97ff\u7684\u65b9\u5f0f\u522a\u9664\u8cc7\u8a0a\u3002<\/p>\n \n
\n\n\n <\/i>\n <\/div>\n\u8b8a\u63db\u7de8\u78bc<\/h4>\n
\u8a72\u6280\u8853\u5c07\u8cc7\u6599\u5f9e\u4e00\u500b\u57df\uff08\u5982\u7a7a\u9593\uff09\u8f49\u63db\u5230\u53e6\u4e00\u500b\u57df\uff08\u5982\u983b\u7387\uff09\uff0c\u5728\u5176\u4e2d\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u61c9\u7528\u58d3\u7e2e\u3002 JPEG \u4e2d\u4f7f\u7528\u7684\u96e2\u6563\u9918\u5f26\u8f49\u63db (DCT) \u5c31\u662f\u4e00\u500b\u5178\u578b\u7684\u4f8b\u5b50\u3002<\/p>\n
\n \u6d41\u7a0b\uff1a<\/strong>\n\n
- \u5c07\u5f71\u50cf\u5340\u584a\u8f49\u63db\u70ba\u983b\u7387\u5206\u91cf<\/li>\n
- \u66f4\u7a4d\u6975\u5730\u91cf\u5316\u9ad8\u983b\u5206\u91cf<\/li>\n
- \u4eba\u773c\u5c0d\u9019\u4e9b\u983b\u7387\u8f03\u4e0d\u654f\u611f<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n
\n\n <\/i>\n <\/div>\n\u91cf\u5316<\/h4>\n
\u91cf\u5316\u6703\u964d\u4f4e\u6578\u64da\u503c\u7684\u7cbe\u78ba\u5ea6\u3002\u5b83\u5c07\u4e00\u7cfb\u5217\u8f38\u5165\u503c\u6620\u5c04\u5230\u8f03\u5c0f\u7684\u4e00\u7d44\u8f38\u51fa\u503c\uff0c\u5f9e\u800c\u6709\u6548\u5730\u6e1b\u5c11\u4e86\u8868\u793a\u8cc7\u6599\u6240\u9700\u7684\u4f4d\u6578\u3002<\/p>\n
\n \u7bc4\u4f8b\uff1a<\/strong>\nOriginal values: 4.13, 4.28, 4.97, 4.02\nQuantized to: 4, 4, 5, 4<\/pre>\n <\/div>\n <\/div>\n \n\n\n <\/i>\n <\/div>\n\u5fc3\u7406\u8072\u5b78\u5efa\u6a21<\/h4>\n
\u8a72\u6280\u8853\u7528\u65bc\u97f3\u983b\u58d3\u7e2e\uff0c\u5229\u7528\u4e86\u4eba\u985e\u807d\u529b\u7684\u9650\u5236\u3002\u5b83\u78ba\u5b9a\u53ef\u4ee5\u522a\u9664\u54ea\u4e9b\u97f3\u8a0a\u7d44\u4ef6\u800c\u4e0d\u5f71\u97ff\u611f\u77e5\u7684\u97f3\u8cea\u3002<\/p>\n
\n \u95dc\u9375\u6982\u5ff5\uff1a<\/strong>\n\n
- \u807d\u89ba\u63a9\u853d\uff1a\u8f03\u5927\u7684\u8072\u97f3\u63a9\u84cb\u8f03\u5c0f\u7684\u8072\u97f3<\/li>\n
- \u983b\u7387\u9748\u654f\u5ea6\uff1a\u4eba\u985e\u6700\u80fd\u807d\u5230\u4e2d\u983b<\/li>\n
- \u6642\u9593\u63a9\u853d\uff1a\u8072\u97f3\u53ef\u4ee5\u63a9\u84cb\u4e4b\u524d\/\u4e4b\u5f8c\u4e0d\u4e45\u767c\u751f\u7684\u5176\u4ed6\u8072\u97f3<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n
\n\n <\/i>\n <\/div>\n\u611f\u77e5\u7de8\u78bc<\/h4>\n
\u8207\u5fc3\u7406\u8072\u5b78\u5efa\u6a21\u985e\u4f3c\uff0c\u4f46\u5c0d\u65bc\u8996\u89ba\u6578\u64da\uff0c\u9019\u7a2e\u65b9\u6cd5\u6d88\u9664\u4e86\u4eba\u773c\u4e0d\u592a\u53ef\u80fd\u6ce8\u610f\u5230\u7684\u8a0a\u606f\uff0c\u7279\u5225\u662f\u9ad8\u983b\u7d30\u7bc0\u548c\u984f\u8272\u8b8a\u5316\u3002<\/p>\n
\n \u61c9\u7528\uff1a<\/strong>\n\u7528\u65bc JPEG\u3001MPEG \u548c\u5176\u4ed6\u8996\u89ba\u58d3\u7e2e\u6a19\u6e96\uff0c\u4ee5\u512a\u5148\u8003\u616e\u611f\u77e5\u4e0a\u91cd\u8981\u7684\u6578\u64da\u3002<\/p>\n <\/div>\n <\/div>\n \n
\n\n <\/i>\n <\/div>\n\u904b\u52d5\u88dc\u511f<\/h4>\n
\u900f\u904e\u5c0d\u5e40\u4e4b\u9593\u7684\u5dee\u7570\u800c\u4e0d\u662f\u6bcf\u500b\u5b8c\u6574\u5e40\u9032\u884c\u7de8\u78bc\u4f86\u5229\u7528\u6642\u9593\u5197\u9918\u7684\u8996\u8a0a\u58d3\u7e2e\u6280\u8853\u3002\u50c5\u5f9e\u4e00\u5e40\u5230\u4e0b\u4e00\u5e40\u7684\u8b8a\u5316\u88ab\u5b8c\u5168\u7de8\u78bc\u3002<\/p>\n
\n \u904e\u7a0b\uff1a<\/strong>\n\n
- \u5b9a\u671f\u5132\u5b58\u5b8c\u6574\u7684\u300c\u95dc\u9375\u5f71\u683c\u300d\uff08I \u5e40\uff09<\/li>\n
- \u5c0d\u65bc\u5176\u4ed6\u5e40\uff0c\u50c5\u5132\u5b58\u5dee\u7570\uff08P \u5e40\uff09\u6216\u96d9\u5411\u5dee\u7570\uff08B \u5e40\uff09<\/li>\n
- \u5f71\u7247\u6a94\u6848\u5927\u5c0f\u986f\u8457\u6e1b\u5c0f<\/li>\n <\/ul>\n <\/div>\n <\/div>\n \n
\n\n <\/i>\n <\/div>\n\u8272\u5ea6\u5b50\u53d6\u6a23<\/h4>\n
\u8a72\u6280\u8853\u5229\u7528\u4e86\u4eba\u773c\u5c0d\u4eae\u5ea6\u6bd4\u5c0d\u8272\u5dee\u66f4\u654f\u611f\u7684\u512a\u52e2\uff0c\u6e1b\u5c11\u4e86\u984f\u8272\u8cc7\u8a0a\u800c\u4e0d\u662f\u4eae\u5ea6\u8cc7\u8a0a\u3002<\/p>\n
\n \u5e38\u898b\u683c\u5f0f\uff1a<\/strong>\n\n
- 4:4:4 – \u7121\u5b50\u53d6\u6a23\uff08\u5168\u5f69\uff09<\/li>\n
- 4:2:2 – \u6c34\u5e73\u8272\u5f69\u89e3\u6790\u5ea6\u6e1b\u534a<\/li>\n
- 4:2:0 – \u6c34\u5e73\u548c\u5782\u76f4\u8272\u5f69\u89e3\u6790\u5ea6\u6e1b\u534a<\/li>\n <\/ul>\n <\/div>\n <\/div>\n <\/div>\n \n
\u5e38\u898b\u7684\u6709\u640d\u6587\u4ef6\u683c\u5f0f<\/h3>\n
\n\n\n <\/i>\n\u5716\u7247<\/h4>\n <\/div>\n
\nJPEG<\/div>\nWebP\uff08\u6709\u640d\uff09<\/div>\nJPEG 2000<\/div>\n\u6d77\u4f0a\u592b<\/div>\nAVIF<\/div>\n <\/div>\n <\/div>\n \n\n\n <\/i>\n\u8072\u97f3\u7684<\/h4>\n <\/div>\n
\nMP3<\/div>\n\u4e9e\u514b\u529b<\/div>\n\u6c83\u723e\u6bd4\u65af<\/div>\n\u4f5c\u54c1<\/div>\n\u4e16\u754c\u97f3\u6a02\u5354\u6703<\/div>\n <\/div>\n <\/div>\n \n\n\n <\/i>\n\u5f71\u7247<\/h4>\n <\/div>\n
\nH.264<\/div>\nH.265<\/div>\nVP9<\/div>\nAV1<\/div>\n\u7db2\u8def\u7ba1\u7406<\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/section>\n \n \n\n \u5be6\u969b\u61c9\u7528\u548c\u7528\u4f8b<\/h2>\n \n
\n\n\n\n <\/i>\n <\/div>\n\u6578\u4f4d\u651d\u5f71<\/h3>\n <\/div>\n
\n\u7121\u640d\u58d3\u7e2e<\/h4>\n
\n
- \u5c08\u696d\u651d\u5f71\u5e2b\u7684 RAW \u683c\u5f0f\u5132\u5b58<\/li>\n
- \u91cd\u8981\u7167\u7247\u7684\u5b58\u6a94\u54c1\u8cea\u5b58\u5132<\/li>\n
- \u9700\u8981\u5927\u91cf\u5f8c\u88fd\u6216\u7de8\u8f2f\u7684\u5f71\u50cf<\/li>\n
- PNG \u683c\u5f0f\uff0c\u9069\u7528\u65bc\u5177\u6709\u6587\u5b57\u6216\u92b3\u908a\u7684\u5716\u5f62<\/li>\n <\/ul>\n \n
\u6709\u640d\u58d3\u7e2e<\/h4>\n
\n
- \u7528\u65bc\u65e5\u5e38\u7167\u7247\u548c\u7db2\u8def\u5171\u4eab\u7684 JPEG<\/li>\n
- \u756b\u5eca\u548c\u9810\u89bd\u7684\u7e2e\u5716\u751f\u6210<\/li>\n
- \u793e\u7fa4\u5a92\u9ad4\u4e0a\u50b3\u6709\u5927\u5c0f\u9650\u5236<\/li>\n
- \u96fb\u5b50\u90f5\u4ef6\u9644\u4ef6\u548c\u8a0a\u606f\u61c9\u7528\u7a0b\u5f0f<\/li>\n <\/ul>\n \n
\n \u6700\u4f73\u5be6\u8e10\uff1a<\/strong> \u4ee5 RAW \u6216\u7121\u640d\u683c\u5f0f\u6355\u7372\uff0c\u5efa\u7acb\u6709\u640d\u7248\u672c\u4ee5\u4f9b\u5171\u4eab\uff0c\u4fdd\u7559\u7121\u640d\u6bcd\u7248\u4ee5\u4f9b\u5b58\u6a94\u3002\n <\/div>\n <\/div>\n <\/div>\n \n\n\n\n <\/i>\n <\/div>\n