{"id":6511,"date":"2022-08-28T20:12:00","date_gmt":"2022-08-28T12:12:00","guid":{"rendered":"http:\/\/139.9.1.231\/?p=6511"},"modified":"2022-09-05T15:02:23","modified_gmt":"2022-09-05T07:02:23","slug":"unet","status":"publish","type":"post","link":"http:\/\/139.9.1.231\/index.php\/2022\/08\/28\/unet\/","title":{"rendered":"UNet\u7f51\u7edc"},"content":{"rendered":"\n<p>\u8bba\u6587\uff1a <a href=\"https:\/\/arxiv.org\/abs\/1505.04597\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/arxiv.org\/abs\/1505.04597<\/a><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" width=\"819\" height=\"303\" src=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/08\/image-407.png\" alt=\"\" class=\"wp-image-6513\" srcset=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/08\/image-407.png 819w, http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/08\/image-407-300x111.png 300w, http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/08\/image-407-768x284.png 768w\" sizes=\"(max-width: 819px) 100vw, 819px\" \/><\/figure>\n\n\n\n<p>    FCN\u867d\u7136\u505a\u51fa\u4e86\u5f00\u521b\u6027\u7684\u5de5\u4f5c\uff0cFCN-8s\u76f8\u8f83\u4e8e\u6b64\u524d\u7684SOTA\u5206\u5272\u8868\u73b0\uff0c\u5df2\u7ecf\u53d6\u5f97\u4e86\u5de8\u5927\u7684\u4f18\u52bf\u3002\u4f46\u4ece\u5206\u5272\u6548\u679c\u4e0a\u770b\u8fd8\u5f88\u7c97\u7cd9\uff0c\u5bf9\u56fe\u50cf\u7684\u7ec6\u8282\u5904\u7406\u8fd8\u5f88\u4e0d\u6210\u719f\uff0c\u4e5f\u6ca1\u6709\u8003\u8651\u5230\u50cf\u7d20\u4e0e\u50cf\u7d20\u4e4b\u95f4\u7684\u4e0a\u4e0b\u6587\uff08context\uff09\u5173\u7cfb\uff0c\u6240\u4ee5FCN\u66f4\u50cf\u662f\u4e00\u9879\u629b\u7816\u5f15\u7389\u5f0f\u7684\u5de5\u4f5c\uff0c\u968f\u7740U\u5f62\u7684\u7f16\u89e3\u7801\u7ed3\u6784\u6210\u4e3a\u901a\u7528\u7684\u8bed\u4e49\u5206\u5272\u7f51\u7edc\u8bbe\u8ba1\u8303\u5f0f\uff0c\u5404\u79cd\u7f51\u7edc\u5982\u96e8\u540e\u6625\u7b0b\u822c\u6d8c\u73b0\u3002UNet\u662fU\u5f62\u7f51\u7edc\u7ed3\u6784\u6700\u7ecf\u5178\u548c\u6700\u4e3b\u8981\u7684\u4ee3\u8868\u7f51\u7edc\uff0c\u56e0\u5176\u7f51\u7edc\u7ed3\u6784\u662f\u4e00\u4e2aU\u5f62\u800c\u5f97\u540d\uff0c\u8fd9\u7c7b\u7f16\u89e3\u7801\u7684\u7ed3\u6784\u4e5f\u56e0\u800c\u88ab\u79f0\u4e4b\u4e3aU\u5f62\u7ed3\u6784\u3002\u63d0\u51faUNet\u7684\u8bba\u6587\u4e3aU-Net: Convolutional Networks for Biomedical Image Segmentation\uff0c\u4e0eFCN\u63d0\u51fa\u65f6\u95f4\u76f8\u5dee\u4e86\u4e24\u4e2a\u6708\uff0c\u5176\u7ed3\u6784\u8bbe\u8ba1\u5728FCN\u57fa\u7840\u4e0a\u505a\u4e86\u8fdb\u4e00\u6b65\u7684\u6539\u8fdb\uff0c\u8bbe\u8ba1\u521d\u8877\u4e3b\u8981\u662f\u7528\u4e8e\u533b\u5b66\u56fe\u50cf\u7684\u5206\u5272\u3002\u622a\u81f3\u5230\u672c\u4e66\u5199\u7a3f\uff0cUNet\u5728\u8c37\u6b4c\u5b66\u672f\u4e0a\u7684\u5f15\u7528\u6b21\u6570\u5df2\u8fbe44772\u6b21\uff0c\u582a\u79f0\u6df1\u5ea6\u5b66\u4e60\u8bed\u4e49\u5206\u5272\u9886\u57df\u7684\u91cc\u7a0b\u7891\u5f0f\u7684\u5de5\u4f5c\u3002<\/p>\n\n\n\n<h2>1\u3001\u4e0eFCN\u533a\u522b<\/h2>\n\n\n\n<p class=\"has-bright-blue-background-color has-background\">     <strong>U-Net\u548cFCN\u975e\u5e38\u7684\u76f8\u4f3c\uff0cU-Net\u6bd4FCN\u7a0d\u665a\u63d0\u51fa\u6765\uff0c\u4f46\u90fd\u53d1\u8868\u57282015\u5e74\uff0c\u548cFCN\u76f8\u6bd4\uff0cU-Net\u7684\u7b2c\u4e00\u4e2a\u7279\u70b9\u662f\u5b8c\u5168\u5bf9\u79f0\uff0c\u4e5f\u5c31\u662f\u5de6\u8fb9\u548c\u53f3\u8fb9\u662f\u5f88\u7c7b\u4f3c\u7684\uff0c\u800cFCN\u7684decoder\u76f8\u5bf9\u7b80\u5355\uff0c\u53ea\u7528\u4e86\u4e00\u4e2adeconvolution\u7684\u64cd\u4f5c\uff0c\u4e4b\u540e\u5e76\u6ca1\u6709\u8ddf\u4e0a\u5377\u79ef\u7ed3\u6784\u3002\u7b2c\u4e8c\u4e2a\u533a\u522b\u5c31\u662fskip connection\uff0cFCN\u7528\u7684\u662f\u52a0\u64cd\u4f5c\uff08summation\uff09\uff0cU-Net\u7528\u7684\u662f\u53e0\u64cd\u4f5c\uff08concatenation\uff09\u3002\u8fd9\u4e9b\u90fd\u662f\u7ec6\u8282\uff0c\u91cd\u70b9\u662f\u5b83\u4eec\u7684\u7ed3\u6784\u7528\u4e86\u4e00\u4e2a\u6bd4\u8f83\u7ecf\u5178\u7684\u601d\u8def\uff0c\u4e5f\u5c31\u662f\u7f16\u7801\u548c\u89e3\u7801\uff08encoder-decoder\uff09\uff0c\u65e9\u57282006\u5e74\u5c31\u88abHinton\u5927\u795e\u63d0\u51fa\u6765\u53d1\u8868\u5728\u4e86nature\u4e0a.<\/strong><\/p>\n\n\n\n<p>\u5f53\u65f6\u8fd9\u4e2a\u7ed3\u6784\u63d0\u51fa\u7684\u4e3b\u8981\u4f5c\u7528\u5e76\u4e0d\u662f\u5206\u5272\uff0c\u800c\u662f\u538b\u7f29\u56fe\u50cf\u548c\u53bb\u566a\u58f0\u3002\u8f93\u5165\u662f\u4e00\u5e45\u56fe\uff0c\u7ecf\u8fc7\u4e0b\u91c7\u6837\u7684\u7f16\u7801\uff0c\u5f97\u5230\u4e00\u4e32\u6bd4\u539f\u5148\u56fe\u50cf\u66f4\u5c0f\u7684\u7279\u5f81\uff0c\u76f8\u5f53\u4e8e\u538b\u7f29\uff0c\u7136\u540e\u518d\u7ecf\u8fc7\u4e00\u4e2a\u89e3\u7801\uff0c\u7406\u60f3\u72b6\u51b5\u5c31\u662f\u80fd\u8fd8\u539f\u5230\u539f\u6765\u7684\u56fe\u50cf\u3002\u8fd9\u6837\u7684\u8bdd\u6211\u4eec\u5b58\u4e00\u5e45\u56fe\u7684\u65f6\u5019\u5c31\u53ea\u9700\u8981\u5b58\u4e00\u4e2a\u7279\u5f81\u548c\u4e00\u4e2a\u89e3\u7801\u5668\u5373\u53ef\u3002\u8fd9\u4e2a\u60f3\u6cd5\u6211\u4e2a\u4eba\u8ba4\u4e3a\u662f\u5f88\u6f02\u4eae\u4e86\u3002\u540c\u7406\uff0c\u8fd9\u4e2a\u601d\u8def\u4e5f\u53ef\u4ee5\u7528\u5728\u539f\u56fe\u50cf\u53bb\u566a\uff0c\u505a\u6cd5\u5c31\u662f\u5728\u8bad\u7ec3\u7684\u9636\u6bb5\u5728\u539f\u56fe\u4eba\u4e3a\u7684\u52a0\u4e0a\u566a\u58f0\uff0c\u7136\u540e\u653e\u5230\u8fd9\u4e2a\u7f16\u7801\u89e3\u7801\u5668\u4e2d\uff0c\u76ee\u6807\u662f\u53ef\u4ee5\u8fd8\u539f\u5f97\u5230\u539f\u56fe\u3002<\/p>\n\n\n\n<p>\u540e\u6765\u628a\u8fd9\u4e2a\u601d\u8def\u88ab\u7528\u5728\u4e86\u56fe\u50cf\u5206\u5272\u7684\u95ee\u9898\u4e0a\uff0c\u4e5f\u5c31\u662f\u73b0\u5728\u6211\u4eec\u770b\u5230\u7684U-Net\u7ed3\u6784\uff0c\u5728\u5b83\u88ab\u63d0\u51fa\u7684\u4e09\u5e74\u4e2d\uff0c\u6709\u5f88\u591a\u5f88\u591a\u7684\u8bba\u6587\u53bb\u8bb2\u5982\u4f55\u6539\u8fdbU-Net\u6216\u8005FCN\uff0c\u4e0d\u8fc7\u8fd9\u4e2a\u5206\u5272\u7f51\u7edc\u7684\u672c\u8d28\u7684\u62d3\u6251\u7ed3\u6784\u662f\u6ca1\u6709\u6539\u52a8\u7684\u3002\u4e3e\u4f8b\u6765\u8bf4\uff0c\u53bb\u5e74ICCV\u4e0a\u51ef\u660e\u5927\u795e\u63d0\u51fa\u7684Mask RCNN. \u76f8\u5f53\u4e8e\u4e00\u4e2a\u68c0\u6d4b\uff0c\u5206\u7c7b\uff0c\u5206\u5272\u7684\u96c6\u5927\u6210\u8005\uff0c\u6211\u4eec\u4ed4\u7ec6\u53bb\u770b\u5b83\u7684\u5206\u5272\u90e8\u5206\uff0c\u5176\u5b9e\u4f7f\u7528\u7684\u4e5f\u5c31\u662f\u8fd9\u4e2a\u7b80\u5355\u7684FCN\u7ed3\u6784\u3002\u8bf4\u660e\u4e86\u8fd9\u79cd\u201cU\u5f62\u201d\u7684\u7f16\u7801\u89e3\u7801\u7ed3\u6784\u786e\u5b9e\u975e\u5e38\u7684\u7b80\u6d01\uff0c\u5e76\u4e14\u6700\u5173\u952e\u7684\u4e00\u70b9\u662f\u597d\u7528\u3002<\/p>\n\n\n\n<h2>2\u3001\u4e3a\u4ec0\u4e48\u6709\u6548<\/h2>\n\n\n\n<p>\u76f8\u6bd4\u4e8eFCN\u548cDeeplab\u7b49\uff0cUNet\u5171\u8fdb\u884c\u4e864\u6b21\u4e0a\u91c7\u6837\uff0c\u5e76\u5728\u540c\u4e00\u4e2astage\u4f7f\u7528\u4e86skip connection\uff0c\u800c\u4e0d\u662f\u76f4\u63a5\u5728\u9ad8\u7ea7\u8bed\u4e49\u7279\u5f81\u4e0a\u8fdb\u884c\u76d1\u7763\u548closs\u53cd\u4f20\uff0c\u8fd9\u6837\u5c31\u4fdd\u8bc1\u4e86\u6700\u540e\u6062\u590d\u51fa\u6765\u7684\u7279\u5f81\u56fe\u878d\u5408\u4e86\u66f4\u591a\u7684low-level\u7684feature\uff0c\u4e5f\u4f7f\u5f97\u4e0d\u540cscale\u7684feature\u5f97\u5230\u4e86\u7684\u878d\u5408\uff0c\u4ece\u800c\u53ef\u4ee5\u8fdb\u884c\u591a\u5c3a\u5ea6\u9884\u6d4b\u548cDeepSupervision\u30024\u6b21\u4e0a\u91c7\u6837\u4e5f\u4f7f\u5f97\u5206\u5272\u56fe\u6062\u590d\u8fb9\u7f18\u7b49\u4fe1\u606f\u66f4\u52a0\u7cbe\u7ec6\u3002<\/p>\n\n\n\n<p>\u5176\u6b21\u6211\u4eec\u804a\u804a\u3010\u533b\u7597\u5f71\u50cf\u3011\uff0c\u533b\u7597\u5f71\u50cf\u6709\u4ec0\u4e48\u6837\u7684\u7279\u70b9\u5462\uff08\u5c24\u5176\u662f\u76f8\u5bf9\u4e8e\u81ea\u7136\u5f71\u50cf\u800c\u8a00\uff09\uff1f<\/p>\n\n\n\n<p>1.\u56fe\u50cf\u8bed\u4e49\u8f83\u4e3a\u7b80\u5355\u3001\u7ed3\u6784\u8f83\u4e3a\u56fa\u5b9a\u3002\u6211\u4eec\u505a\u8111\u7684\uff0c\u5c31\u7528\u8111CT\u548c\u8111MRI\uff0c\u505a\u80f8\u7247\u7684\u53ea\u7528\u80f8\u7247CT\uff0c\u505a\u773c\u5e95\u7684\u53ea\u7528\u773c\u5e95OCT\uff0c\u90fd\u662f\u4e00\u4e2a\u56fa\u5b9a\u7684\u5668\u5b98\u7684\u6210\u50cf\uff0c\u800c\u4e0d\u662f\u5168\u8eab\u7684\u3002\u7531\u4e8e\u5668\u5b98\u672c\u8eab\u7ed3\u6784\u56fa\u5b9a\u548c\u8bed\u4e49\u4fe1\u606f\u6ca1\u6709\u7279\u522b\u4e30\u5bcc\uff0c\u6240\u4ee5\u9ad8\u7ea7\u8bed\u4e49\u4fe1\u606f\u548c\u4f4e\u7ea7\u7279\u5f81\u90fd\u663e\u5f97\u5f88\u91cd\u8981(UNet\u7684skip connection\u548cU\u578b\u7ed3\u6784\u5c31\u6d3e\u4e0a\u4e86\u7528\u573a)\u3002<\/p>\n\n\n\n<p>2.\u6570\u636e\u91cf\u5c11\u3002\u533b\u5b66\u5f71\u50cf\u7684\u6570\u636e\u83b7\u53d6\u76f8\u5bf9\u96be\u4e00\u4e9b\uff0c\u5f88\u591a\u6bd4\u8d5b\u53ea\u63d0\u4f9b\u4e0d\u5230100\u4f8b\u6570\u636e\u3002\u6240\u4ee5\u6211\u4eec\u8bbe\u8ba1\u7684\u6a21\u578b\u4e0d\u5b9c\u591a\u5927\uff0c\u53c2\u6570\u8fc7\u591a\uff0c\u5f88\u5bb9\u6613\u5bfc\u81f4\u8fc7\u62df\u5408\u3002<\/p>\n\n\n\n<p>\u539f\u59cbUNet\u7684\u53c2\u6570\u91cf\u572828M\u5de6\u53f3(\u4e0a\u91c7\u6837\u5e26\u8f6c\u7f6e\u5377\u79ef\u7684UNet\u53c2\u6570\u91cf\u572831M\u5de6\u53f3)\uff0c\u800c\u5982\u679c\u628achannel\u6570\u6210\u500d\u7f29\u5c0f\uff0c\u6a21\u578b\u53ef\u4ee5\u66f4\u5c0f\u3002\u7f29\u5c0f\u4e24\u500d\u540e\uff0cUNet\u53c2\u6570\u91cf\u57287.75M\u3002\u7f29\u5c0f\u56db\u500d\uff0c\u53ef\u4ee5\u628a\u6a21\u578b\u53c2\u6570\u91cf\u7f29\u5c0f\u81f32M\u4ee5\u5185\uff0c\u975e\u5e38\u8f7b\u91cf\u3002\u4e2a\u4eba\u5c1d\u8bd5\u8fc7\u4f7f\u7528Deeplab v3+\u548cDRN\u7b49\u81ea\u7136\u56fe\u50cf\u8bed\u4e49\u5206\u5272\u7684SOTA\u7f51\u7edc\u5728\u81ea\u5df1\u7684\u9879\u76ee\u4e0a\uff0c\u53d1\u73b0\u6548\u679c\u548cUNet\u5dee\u4e0d\u591a\uff0c\u4f46\u662f\u53c2\u6570\u91cf\u4f1a\u5927\u5f88\u591a\u3002<\/p>\n\n\n\n<p><strong>\u4e3a\u4ec0\u4e48\u9002\u7528\u4e8e\u533b\u5b66\u56fe\u50cf\uff1f<\/strong><\/p>\n\n\n\n<p>\uff081\uff09\u56e0\u4e3a\u533b\u5b66\u56fe\u50cf\u8fb9\u754c\u6a21\u7cca\u3001\u68af\u5ea6\u590d\u6742\uff0c\u9700\u8981\u8f83\u591a\u7684\u9ad8\u5206\u8fa8\u7387\u4fe1\u606f\u3002\u9ad8\u5206\u8fa8\u7387\u7528\u4e8e\u7cbe\u51c6\u5206\u5272\u3002<\/p>\n\n\n\n<p>\uff082\uff09\u4eba\u4f53\u5185\u90e8\u7ed3\u6784\u76f8\u5bf9\u56fa\u5b9a\uff0c\u5206\u5272\u76ee\u6807\u5728\u4eba\u4f53\u56fe\u50cf\u4e2d\u7684\u5206\u5e03\u5f88\u5177\u6709\u89c4\u5f8b\uff0c\u8bed\u4e49\u7b80\u5355\u660e\u786e\uff0c\u4f4e\u5206\u8fa8\u7387\u4fe1\u606f\u80fd\u591f\u63d0\u4f9b\u8fd9\u4e00\u4fe1\u606f\uff0c\u7528\u4e8e\u76ee\u6807\u7269\u4f53\u7684\u8bc6\u522b\u3002<\/p>\n\n\n\n<p>UNet\u7ed3\u5408\u4e86<strong>\u4f4e\u5206\u8fa8\u7387\u4fe1\u606f<\/strong>\uff08\u63d0\u4f9b\u7269\u4f53\u7c7b\u522b\u8bc6\u522b\u4f9d\u636e\uff09\u548c<strong>\u9ad8\u5206\u8fa8\u7387\u4fe1\u606f<\/strong>\uff08\u63d0\u4f9b\u7cbe\u51c6\u5206\u5272\u5b9a\u4f4d\u4f9d\u636e\uff09\uff0c\u5b8c\u7f8e\u9002\u7528\u4e8e\u533b\u5b66\u56fe\u50cf\u5206\u5272\u3002<\/p>\n\n\n\n<h2>\u7f51\u7edc\u7ed3\u6784<\/h2>\n\n\n\n<p>\u5728\u533b\u5b66\u56fe\u50cf\u9886\u57df\uff0c\u5177\u4f53\u5230\u66f4\u52a0\u7ec6\u5206\u7684\u533b\u5b66\u56fe\u50cf\u8bc6\u522b\u4efb\u52a1\u65f6\uff0c\u5927\u91cf\u7684\u5e26\u6709\u9ad8\u8d28\u91cf\u6807\u6ce8\u7684\u56fe\u50cf\u6570\u636e\u5341\u5206\u96be\u5f97\uff0c\u5728\u6b64\u4e4b\u524d\u7684\u901a\u5e38\u505a\u6cd5\u662f\u91c7\u7528\u6ed1\u52a8\u7a97\u53e3\u5377\u79ef\uff08\u7c7b\u4f3c\u4e8e\u56fe\u50cf\u5206\u5757\uff09\u7684\u65b9\u5f0f\u6765\u8fdb\u884c\u56fe\u50cf\u5c40\u90e8\u9884\u6d4b\uff0c\u8fd9\u4e48\u505a\u7684\u597d\u5904\u662f\u53ef\u4ee5\u505a\u56fe\u50cf\u50cf\u7d20\u505a\u5230\u4e00\u5b9a\u7a0b\u5ea6\u5b9a\u4f4d\uff0c\u5176\u6b21\u5c31\u662f\u6ed1\u7a97\u5206\u5757\u80fd\u591f\u4f7f\u5f97\u8bad\u7ec3\u6837\u672c\u91cf\u589e\u591a\u3002\u4f46\u7f3a\u70b9\u4e5f\u5f88\u660e\u663e\uff0c\u4e00\u4e2a\u662f\u6ed1\u7a97\u64cd\u4f5c\u975e\u5e38\u8017\u65f6\uff0c\u63a8\u7406\u7684\u65f6\u5019\u6548\u7387\u4f4e\u4e0b\uff0c\u5176\u6b21\u5c31\u662f\u4e0d\u80fd\u517c\u987e\u5b9a\u4f4d\u7cbe\u5ea6\u548c\u50cf\u7d20\u4e0a\u4e0b\u6587\u4fe1\u606f\u7684\u5229\u7528\u7387\u3002UNet\u5728FCN\u7684\u57fa\u7840\u4e0a\uff0c\u5b8c\u6574\u5730\u7ed9\u51fa\u4e86U\u5f62\u7684\u7f16\u89e3\u7801\u7ed3\u6784\uff0c\u5982\u4e0b\u56fe\u6240\u793a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" width=\"817\" height=\"531\" src=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/08\/image-408.png\" alt=\"\" class=\"wp-image-6515\" srcset=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/08\/image-408.png 817w, http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/08\/image-408-300x195.png 300w, http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/08\/image-408-768x499.png 768w\" sizes=\"(max-width: 817px) 100vw, 817px\" \/><\/figure>\n\n\n\n<p>\u8f93\u5165\u662f\u4e00\u5e45\u56fe\uff0c\u8f93\u51fa\u662f\u76ee\u6807\u7684\u5206\u5272\u7ed3\u679c\u3002\u7ee7\u7eed\u7b80\u5316\u5c31\u662f\uff0c\u4e00\u5e45\u56fe\uff0c\u7f16\u7801\uff0c\u6216\u8005\u8bf4\u964d\u91c7\u6837\uff0c\u7136\u540e\u89e3\u7801\uff0c\u4e5f\u5c31\u662f\u5347\u91c7\u6837\uff0c\u7136\u540e\u8f93\u51fa\u4e00\u4e2a\u5206\u5272\u7ed3\u679c\u3002\u6839\u636e\u7ed3\u679c\u548c\u771f\u5b9e\u5206\u5272\u7684\u5dee\u5f02\uff0c\u53cd\u5411\u4f20\u64ad\u6765\u8bad\u7ec3\u8fd9\u4e2a\u5206\u5272\u7f51\u7edc\u3002\u6211\u4eec\u53ef\u4ee5\u8bf4\uff0cU-Net\u91cc\u9762\u6700\u7cbe\u5f69\u7684\u90e8\u5206\u5c31\u662f\u8fd9\u4e09\u90e8\u5206\uff1a<\/p>\n\n\n\n<ul><li>\u4e0b\u91c7\u6837<\/li><li>\u4e0a\u91c7\u6837<\/li><li>skip connection<\/li><\/ul>\n\n\n\n<p>UNet\u7ed3\u6784\u5305\u62ec\u7f16\u7801\u5668\u4e0b\u91c7\u6837\u3001\u89e3\u7801\u5668\u4e0a\u91c7\u6837\u548c\u540c\u5c42\u8df3\u8dc3\u8fde\u63a5\u4e09\u4e2a\u7ec4\u6210\u90e8\u5206\u3002\u7f16\u7801\u5668\u75314\u7ec4\u5377\u79ef\u3001ReLU\u6fc0\u6d3b\u548c\u6700\u5927\u6c60\u5316\u6784\u6210\uff0c\u6bcf\u4e00\u7ec4\u5747\u6709\u4e24\u6b213*3\u7684\u5377\u79ef\uff0c\u6bcf\u4e2a\u5377\u79ef\u5c42\u540e\u9762\u90fd\u6709\u4e00\u6b21ReLU\u6fc0\u6d3b\u51fd\u6570\uff0c\u7136\u540e\u518d\u8fdb\u884c\u4e00\u6b21\u6b65\u957f\u4e3a2\u76842*2\u6700\u5927\u6c60\u5316\u8fdb\u884c\u4e0b\u91c7\u6837\uff0c\u5982\u7b2c\u4e00\u7ec4\u64cd\u4f5c\u8f93\u5165\u56fe\u50cf\u5927\u5c0f\u4e3a572*572\uff0c\u4e24\u8f6e3*3\u7684\u5377\u79ef\u4e4b\u540e\u7684\u7279\u5f81\u56fe\u5927\u5c0f\u4e3a568*568\uff0c\u518d\u7ecf\u8fc722\u6700\u5927\u6c60\u5316\u540e\u7684\u8f93\u51fa\u5c3a\u5bf8\u4e3a284*284\u3002\u89e3\u7801\u5668\u75314\u7ec42*2\u8f6c\u7f6e\u5377\u79ef\u30013*3\u5377\u79ef\u6784\u6210\u548c\u4e00\u4e2aReLU\u6fc0\u6d3b\u51fd\u6570\u6784\u6210\uff0c\u5728\u6700\u540e\u7684\u8f93\u51fa\u5c42\u53c8\u8865\u5145\u4e86\u4e00\u4e2a1*1\u5377\u79ef\u3002\u6700\u540e\u662f\u540c\u5c42\u8df3\u8dc3\u8fde\u63a5\uff0c\u8fd9\u4e5f\u662fUNet\u7684\u7279\u8272\u64cd\u4f5c\u4e4b\u4e00\uff0c\u6307\u7684\u662f\u5c06\u4e0b\u91c7\u6837\u65f6\u6bcf\u4e00\u5c42\u7684\u8f93\u51fa\u88c1\u526a\u540e\u8fde\u63a5\u5230\u540c\u5c42\u7684\u4e0a\u91c7\u6837\u5c42\u505a\u878d\u5408\u3002\u6bcf\u4e00\u6b21\u4e0b\u91c7\u6837\u90fd\u4f1a\u6709\u4e00\u4e2a\u8df3\u8dc3\u8fde\u63a5\u4e0e\u5bf9\u5e94\u7684\u4e0a\u91c7\u6837\u8fdb\u884c\u878d\u5408\uff0c\u8fd9\u79cd\u4e0d\u540c\u5c3a\u5ea6\u7684\u7279\u5f81\u878d\u5408\u5bf9\u4e0a\u91c7\u6837\u6062\u590d\u50cf\u7d20\u5927\u6709\u5e2e\u52a9\uff0c<strong>\u5177\u4f53\u6765\u8bf4\u5c31\u662f\u9ad8\u5c42\uff08\u6d45\u5c42\uff09\u4e0b\u91c7\u6837\u500d\u6570\u5c0f\uff0c\u7279\u5f81\u56fe\u5177\u5907\u66f4\u52a0\u7ec6\u81f4\u7684\u56fe\u7279\u5f81\uff0c\u4f4e\u5c42\uff08\u6df1\u5c42\uff09\u4e0b\u91c7\u6837\u500d\u6570\u5927\uff0c\u4fe1\u606f\u7ecf\u8fc7\u5927\u91cf\u6d53\u7f29\uff0c\u7a7a\u95f4\u635f\u5931\u5927\uff0c\u4f46\u6709\u52a9\u4e8e\u76ee\u6807\u533a\u57df\uff08\u5206\u7c7b\uff09\u5224\u65ad\uff0c\u5f53\u9ad8\u5c42\u548c\u4f4e\u5c42\u7684\u7279\u5f81\u8fdb\u884c\u878d\u5408\u65f6\uff0c\u5206\u5272\u6548\u679c\u5f80\u5f80\u4f1a\u975e\u5e38\u597d\u3002<\/strong>\u4ece\u67d0\u79cd\u7a0b\u5ea6\u4e0a\u8bb2\uff0c\u8fd9\u79cd\u8df3\u8dc3\u8fde\u63a5\u4e5f\u53ef\u4ee5\u89c6\u4e3a\u4e00\u79cd\u6df1\u5ea6\u76d1\u7763\u3002<\/p>\n\n\n\n<p>\u6211\u4eec\u5c06UNet\u7ed3\u6784\u6309\u7167\u7f16\u7801\u5668\u3001\u89e3\u7801\u5668\u548c\u540c\u5c42\u8df3\u8dc3\u8fde\u63a5\u8fdb\u884c\u7b80\u5316\uff0c\u5982\u4e0b\u56fe\u6240\u793a\u3002\u7f16\u7801\u5668\u4e0b\u91c7\u6837\u7528\u4e8e\u7279\u5f81\u63d0\u53d6\u548c\u8bed\u4e49\u4fe1\u606f\u6d53\u7f29\uff0c\u89e3\u7801\u5668\u4e0a\u91c7\u6837\u7528\u4e8e\u56fe\u50cf\u50cf\u7d20\u6062\u590d\uff0c\u8df3\u8dc3\u8fde\u63a5\u5219\u7528\u4e8e\u4fe1\u606f\u8865\u5145\u3002\u81ea\u6b64\uff0c\u57fa\u4e8eU\u5f62\u7ed3\u6784\u7684\u7f16\u89e3\u7801\u8bbe\u8ba1\u6210\u4e3a\u6df1\u5ea6\u5b66\u4e60\u8bed\u4e49\u5206\u5272\u4e2d\u7684\u5960\u57fa\u6027\u7684\u7f51\u7edc\u7ed3\u6784\uff0c\u7ecf\u8fc7\u8fd1\u51e0\u5e74\u7684\u53d1\u5c55\uff0c\u8bed\u4e49\u5206\u5272\u867d\u7136\u53d6\u5f97\u4e86\u957f\u8db3\u7684\u8fdb\u6b65\uff0c\u4f46UNet\u548c\u7f16\u89e3\u7801\u7ed3\u6784\u4e00\u76f4\u662f\u65b0\u7684\u6a21\u578b\u8bbe\u8ba1\u7684\u53c2\u7167\u5bf9\u8c61\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" width=\"789\" height=\"419\" src=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/08\/image-409.png\" alt=\"\" class=\"wp-image-6520\" srcset=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/08\/image-409.png 789w, http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/08\/image-409-300x159.png 300w, http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/08\/image-409-768x408.png 768w\" sizes=\"(max-width: 789px) 100vw, 789px\" \/><\/figure>\n\n\n\n<p>\u4ee3\u7801\u5b9e\u73b0\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># \u5bfc\u5165PyTorch\u76f8\u5173\u6a21\u5757\nimport torch\nimport torch.nn as nn\nimport torch.nn.functional as F\n\n### \u7f16\u7801\u5757\nclass UNetEnc(nn.Module):\n    def __init__(self, in_channels, out_channels, dropout=False):\n        super().__init__()\n    # \u6bcf\u4e00\u4e2a\u7f16\u7801\u5757\u4e2d\u7684\u7ed3\u6784\n        layers = &#91;\n            nn.Conv2d(in_channels, out_channels, 3, dilation=2),\n            nn.ReLU(inplace=True),\n            nn.Conv2d(out_channels, out_channels, 3, dilation=2),\n            nn.ReLU(inplace=True),\n        ]\n        if dropout:\n            layers += &#91;nn.Dropout(.5)]\n        layers += &#91;nn.MaxPool2d(2, stride=2, ceil_mode=True)]\n        self.down = nn.Sequential(*layers)\n  # \u7f16\u7801\u5757\u524d\u5411\u8ba1\u7b97\u6d41\u7a0b\n    def forward(self, x):\n        return self.down(x)\n\n### \u89e3\u7801\u5757    \nclass UNetDec(nn.Module):\n    def __init__(self, in_channels, features, out_channels):\n        super().__init__()\n    # \u6bcf\u4e00\u4e2a\u89e3\u7801\u5757\u4e2d\u7684\u7ed3\u6784\n        self.up = nn.Sequential(\n            nn.Conv2d(in_channels, features, 3),\n            nn.ReLU(inplace=True),\n            nn.Conv2d(features, features, 3),\n            nn.ReLU(inplace=True),\n            nn.ConvTranspose2d(features, out_channels, 2, stride=2),\n            nn.ReLU(inplace=True),\n        )\n  # \u89e3\u7801\u5757\u524d\u5411\u8ba1\u7b97\u6d41\u7a0b\n    def forward(self, x):\n        return self.up(x)\n\n### \u57fa\u4e8e\u7f16\u89e3\u7801\u7684U-Net\nclass UNet(nn.Module):\n    def __init__(self, num_classes):\n        super().__init__()\n    # \u56db\u4e2a\u7f16\u7801\u5757\n        self.enc1 = UNetEnc(3, 64)\n        self.enc2 = UNetEnc(64, 128)\n        self.enc3 = UNetEnc(128, 256)\n        self.enc4 = UNetEnc(256, 512, dropout=True)\n    # \u4e2d\u95f4\u90e8\u5206\uff08U\u5f62\u5e95\u90e8\uff09\n        self.center = nn.Sequential(\n            nn.Conv2d(512, 1024, 3),\n            nn.ReLU(inplace=True),\n            nn.Conv2d(1024, 1024, 3),\n            nn.ReLU(inplace=True),\n            nn.Dropout(),\n            nn.ConvTranspose2d(1024, 512, 2, stride=2),\n            nn.ReLU(inplace=True),\n        )\n    # \u56db\u4e2a\u89e3\u7801\u5757\n        self.dec4 = UNetDec(1024, 512, 256)\n        self.dec3 = UNetDec(512, 256, 128)\n        self.dec2 = UNetDec(256, 128, 64)\n        self.dec1 = nn.Sequential(\n            nn.Conv2d(128, 64, 3),\n            nn.ReLU(inplace=True),\n            nn.Conv2d(64, 64, 3),\n            nn.ReLU(inplace=True),\n        )\n        self.final = nn.Conv2d(64, num_classes, 1)\n\n    # \u524d\u5411\u4f20\u64ad\u8fc7\u7a0b\n    def forward(self, x):\n        enc1 = self.enc1(x)\n        enc2 = self.enc2(enc1)\n        enc3 = self.enc3(enc2)\n        enc4 = self.enc4(enc3)\n        center = self.center(enc4)\n        # \u5305\u542b\u4e86\u540c\u5c42\u5206\u8fa8\u7387\u7ea7\u8054\u7684\u89e3\u7801\u5757\n        dec4 = self.dec4(torch.cat(&#91;\n            center, F.upsample_bilinear(enc4, center.size()&#91;2:])], 1))\n        dec3 = self.dec3(torch.cat(&#91;\n            dec4, F.upsample_bilinear(enc3, dec4.size()&#91;2:])], 1))\n        dec2 = self.dec2(torch.cat(&#91;\n            dec3, F.upsample_bilinear(enc2, dec3.size()&#91;2:])], 1))\n        dec1 = self.dec1(torch.cat(&#91;\n            dec2, F.upsample_bilinear(enc1, dec2.size()&#91;2:])], 1))\n        return F.upsample_bilinear(self.final(dec1), x.size()&#91;2:])<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u8bba\u6587\uff1a https:\/\/arxiv.org\/abs\/1505.04597 FCN\u867d\u7136\u505a\u51fa\u4e86\u5f00\u521b\u6027\u7684\u5de5\u4f5c\uff0cFCN &hellip; <a href=\"http:\/\/139.9.1.231\/index.php\/2022\/08\/28\/unet\/\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">UNet\u7f51\u7edc<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[24],"tags":[],"_links":{"self":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/6511"}],"collection":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/comments?post=6511"}],"version-history":[{"count":5,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/6511\/revisions"}],"predecessor-version":[{"id":6521,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/6511\/revisions\/6521"}],"wp:attachment":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/media?parent=6511"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/categories?post=6511"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/tags?post=6511"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}