{"id":16310,"date":"2020-07-09T15:29:26","date_gmt":"2020-07-09T07:29:26","guid":{"rendered":"https:\/\/blog.tibame.com\/?p=16310"},"modified":"2022-06-08T11:50:38","modified_gmt":"2022-06-08T03:50:38","slug":"%e7%82%ba%e4%bd%95%e8%a6%81%e5%ad%b8%e7%bf%92%e9%9b%b2%e7%ab%af%ef%bc%9f%e4%b8%80%e6%8e%a2%e9%a9%85%e5%8b%95%e5%90%84%e5%a4%a7%e7%a7%91%e6%8a%80%e9%a0%98%e5%9f%9f%e6%88%90%e9%95%b7%e7%9a%84%e5%bc%95-2","status":"publish","type":"post","link":"https:\/\/blog.tibame.com\/?p=16310","title":{"rendered":"\u57fa\u65bc\u6df1\u5ea6\u5b78\u7fd2\u7684\u7269\u9ad4\u5075\u6e2c"},"content":{"rendered":"\n

\u4f5c\u8005\uff1a<\/strong>Alex\u8001\u5e2b <\/a> \u7de8\u8f2f<\/strong>\uff1aTibaMe\u884c\u92b7\u5718\u968a<\/p>\n\n\n\n

\u50b3\u7d71\u6a5f\u5668\u5b78\u7fd2\u6280\u8853\u7684\u7269\u4ef6\u5075\u6e2c\u67b6\u69cb\uff0c\u901a\u5e38\u662f\u7279\u5fb5\u8403\u53d6\u52a0\u4e0a\u5206\u985e\u5668\u4ee5sliding widow\u7684\u65b9\u5f0f\u4f86\u5be6\u73fe\uff0c\u4ee5\u4eba\u81c9\u5075\u6e2c\u70ba\u4f8b\uff0c\u7576\u5982\u4e0b\u9019\u5f35\u5716\u4e2d\u7684window\u6846\u4f4f\u4eba\u81c9\u6642\uff0c\u7406\u8ad6\u4e0a\u6703\u8f38\u51fa\u6700\u9ad8\u7684confidence\uff0c\u7136\u800c\uff0c\u9019\u6a23\u7684\u65b9\u6cd5\u4e3b\u8981\u6709\u5e7e\u500b\u7f3a\u9ede\uff0c\u7b2c\u4e00\u662f\u9019\u4e9b\u7279\u5fb5\u662f\u4eba\u70ba\u8a2d\u8a08\u7684\uff0c\u6240\u4ee5\u8907\u96dc\u5ea6\u8f03\u4f4e\uff0c\u7576\u4eba\u81c9\u4e0d\u5920\u6b63\uff0c\u6216\u662f\u4e94\u5b98\u8b8a\u7570\u6027\u8f03\u5927\u6642\uff0c\u4f8b\u5982\u6b63\u81c9\u8207\u5074\u81c9\uff0c\u5c31\u9700\u8981\u4e0d\u540c\u7684\u4eba\u81c9\u5075\u6e2c\u6a21\u578b\uff0c\u4e5f\u5c31\u662f\u540c\u4e00\u500b\u6a21\u578b\u7121\u6cd5\u540c\u6642\u5075\u6e2c\u6b63\u81c9\u8207\u5074\u81c9\u3002<\/p>\n\n\n\n

\"\u4eba\u81c9\u8fa8\u8b58\"<\/figure><\/div>\n\n\n\n

\u76f8\u8f03\u65bc\u4eba\u81c9\uff0c\u8981\u5075\u6e2c\u4efb\u4e00\u89d2\u5ea6\u7684\u540c\u4e00\u985e\u7269\u9ad4\u90a3\u5c31\u66f4\u8907\u96dc\u4e86\uff0c\u4f8b\u5982\u8eca\u7684\u7a2e\u985e\u6709\u5f88\u591a\u7a2e\uff0c\u4e0d\u540c\u5ee0\u724c\u7684\u8ca8\u8eca\u3001\u623f\u8eca\u3001\u5361\u8eca\u5f9e\u4e0d\u540c\u89d2\u5ea6\u4f86\u770b\uff0c\u9577\u76f8\u90fd\u4e0d\u540c\uff0c\u56e0\u6b64\uff0c\u50b3\u7d71\u7684\u6a5f\u5668\u5b78\u7fd2\u6f14\u7b97\u6cd5\u6700\u7d42\u767c\u5c55\u51faDeformable Part Model\u9019\u6a23\u7684\u7269\u9ad4\u5075\u6e2c\u6f14\u7b97\u6cd5\uff0c\u5176\u4e3b\u8981\u7cbe\u795e\u662f\u5c07\u6bcf\u4e00\u500b\u7269\u9ad4\u5340\u5206\u6210\u591a\u500b\u90e8\u4f4d\uff0c\u4e14\u6bcf\u500b\u90e8\u4f4d\u90fd\u6709\u5c08\u7528\u7684\u5206\u985e\u5668\uff0c\u642d\u914dsliding window\u4f86\u514b\u670d\u6dfa\u5c64\u7279\u5fb5\u7121\u6cd5\u5075\u6e2c\u4efb\u4e00\u89d2\u5ea6\u7269\u9ad4\u7684\u554f\u984c\u3002<\/p>\n\n\n\n

\u5728\u6df1\u5ea6\u5b78\u7fd2\u7684\u6642\u4ee3\uff0c\u7269\u4ef6\u5075\u6e2c\u7684\u521d\u59cb\u6a21\u578b\u662ftwo-stage\u7684\uff0c\u4e5f\u5c31\u662f\u5f9e\u4e00\u5f35\u5f71\u50cf\u4e2d\u5148\u627e\u51faregion\nproposal\uff0c\u518d\u5229\u7528CNN\u5206\u985e\u5668\u5c0d\u9019\u500bregion proposal\u9032\u884c\u5206\u985e\uff0c\u5982\u4e0b\u5716\u7684R-CNN\u662f\u5148\u4ee5Selective Search\u9019\u500b\u65b9\u6cd5\u5f9e\u6bcf\u5f35\u5f71\u50cf\u4e2d\u63d0\u53d6\u5169\u5343\u500bregion proposal\uff0c\u63a5\u8457\u4f7f\u7528CNN\u63d0\u53d6\u6bcf\u500bregion proposal\u88cf\u7684\u7279\u5fb5\uff0c\u518d\u5229\u7528SVM\u9032\u884c\u5206\u985e\uff0c\u9054\u5230\u591a\u985e\u7269\u9ad4\u5075\u6e2c\u7684\u529f\u80fd\u3002\u96d6\u7136\u4f7f\u7528CNN\u53ef\u4ee5\u63d0\u53d6\u66f4\u70ba\u8907\u96dc\u7684\u7279\u5fb5\uff0c\u4f7f\u5f97\u5f9e\u4efb\u610f\u8996\u89d2\u5075\u6e2c\u540c\u4e00\u985e\u7269\u9ad4\u7684\u554f\u984c\u7372\u5f97\u6539\u5584\uff0c\u4f46R-CNN\u6700\u4e3b\u8981\u7684\u7f3a\u9ede\u662fregion proposal\u904e\u591a\uff0c\u4f7f\u5f97\u7cfb\u7d71\u5e7e\u4e4e\u7121\u6cd5\u9054\u5230\u5373\u6642\u904b\u7b97\uff0c\u5047\u4f7f\u4e00\u500bregion proposal\u9700\u89810.001\u79d2\u7684\u8655\u7406\u6642\u9593\uff0c\u5169\u5343\u500bregion proposal\u5c31\u9700\u8981\u5169\u79d2\u9418\uff0c\u800c\u9019\u96e2\u5373\u6642\u904b\u7b97\u6240\u9700\u768430 fps\u9084\u6709\u6975\u5927\u7684\u5dee\u8ddd\u3002<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u6709\u9451\u65bcR-CNN\u6bcf\u500bregion proposal\u90fd\u9700\u8981\u4e00\u500bCNN\u7684\u5b8c\u6574\u904b\u7b97\uff0c\u5b83\u7684\u52a0\u901f\u7248-Fast R-CNN\uff0c\u540c\u6a23\u662f\u4f7f\u7528Selective\nSearch\u63d0\u53d6region proposal\uff0c\u4f46\u6bcf\u5f35\u5f71\u50cf\u53ea\u7528CNN\u7684\u5377\u7a4d\u5c64\u8655\u7406\u4e00\u6b21\uff0c\u6700\u5f8c\u5728conv5\u7684\u7279\u5fb5\u4e0a\uff0c\u526a\u4e0b\u5c0d\u61c9region proposal\u4f4d\u7f6e\u7684feature map\u4e26\u6b63\u898f\u5316\u62107×7\u7684\u5927\u5c0f\uff0c\u6700\u5f8c\u518d\u9032\u884c\u5206\u985e\u8207bounding box\u4f4d\u7f6e\u7684\u5fae\u8abf\u3002\u96d6\u7136Fast R-CNN\u5df2\u7d93\u7701\u53bb\u4e86\u6bcf\u500bregion proposal\u5728convolution layer\u7684\u8655\u7406\u6642\u9593\uff0c\u4f46\u7522\u751fregion proposal\u7684\u65b9\u6cd5-Selective Search\u4ecd\u7136\u9700\u8981\u5169\u79d2\u9418\u624d\u80fd\u5b8c\u6210\u4e00\u5f35\u5716\u4e2dregion proposal\u7684\u63d0\u53d6\u3002<\/p>\n\n\n\n

\u91dd\u5c0dFast R-CNN\u7684\u7f3a\u9ede\uff0cFaster R-CNN\u63d0\u51fa\u4e86RPN (Region\nProposal Network)\u4f86\u63d0\u53d6region proposal\uff0c\u5982\u4e0b\u5716\u6240\u793a\uff0c\u5f8c\u7e8c\u7684\u5206\u985e\u8207bounding box\u5927\u5c0f\u8207\u4f4d\u7f6e\u7684\u5fae\u8abf\u9084\u662f\u4f7f\u7528Fast R-CNN\u3002<\/p>\n\n\n\n

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RPN\u7684\u5177\u9ad4\u5be6\u73fe\u65b9\u5f0f\u662f\uff0c\u5728feature map\u4e0a\u4ee5sliding window\u7684\u65b9\u5f0f\u8ff4\u6b78\u91cd\u5fc3\u5728\u90193×3 convolution kernel\u4e2d\u5fc3\u7684\u7269\u9ad4\u985e\u5225(\u7269\u9ad4vs\u975e\u7269\u9ad4)\u4ee5\u53cabounding box\u7684\u5927\u5c0f(w, h)\u8207\u4f4d\u7f6e(x, y)\uff0c\u70ba\u4e86\u9054\u5230\u66f4\u597d\u7684bounding box\u7cbe\u5ea6\uff0c\u6bcf\u500b\u7269\u9ad4\u90fd\u6703\u4f7f\u7528k\u500banchor box\u505a\u70ba\u8ff4\u6b78\u7684\u57fa\u5e95\u3002Faster R-CNN\u6700\u7d42\u5728Pascal \u7248\u7684Titan X\u4e0a\u53ef\u9054\u52307 FPS\uff0c\u7cbe\u6e96\u5ea6\u66f4\u662f\u9032\u4e00\u6b65\u7684\u63d0\u5347\uff0c\u7136\u800c\uff0c\u9019\u6a23\u7684two stage\u6a21\u578b\uff0c\u7531\u65bc\u6a21\u578b\u7684\u5f8c\u534a\u6bb5\uff0c\u4e5f\u5c31\u662fFast R-CNN\u7684\u90e8\u4efd\uff0c\u6bcf\u4e00\u500bregion proposal\u9084\u662f\u9700\u8981\u57f7\u884c\u4e00\u6b21\uff0c\u4f7f\u5f97\u901f\u5ea6\u4f9d\u7136\u96e2\u5373\u6642\u904b\u7b97\u6709\u5f88\u9059\u9060\u7684\u8ddd\u96e2\uff0c\u800c\u6b63\u56e0\u70ba\u5373\u6642\u904b\u7b97\u5728\u7269\u9ad4\u5075\u6e2c\u9818\u57df\u88cf\u5f37\u70c8\u7684\u9700\u8981\uff0c\u7b2c\u4e00\u500bone stage\u6a21\u578b\u624d\u80fd\u6a6b\u7a7a\u51fa\u4e16\uff0c\u800c\u9019\u500b\u6a21\u578b\u4e5f\u5c31\u662f\u9f0e\u9f0e\u5927\u540d\u7684YOLO (You Only Look Once)\uff0c\u4e5f\u5c31\u662f\u91dd\u5c0d\u4e00\u5f35\u5716\u7247\uff0c\u6574\u500bCNN\u4e2d\u7684\u6bcf\u4e00\u5c64\u53ea\u6703\u88ab\u57f7\u884c\u4e00\u6b21\u3002<\/p>\n\n\n\n

YOLO\u7684\u5177\u9ad4\u57f7\u884c\u6b65\u9a5f\u5982\u4e0b\u5716\u6240\u793a\uff0c\u4e5f\u5c31\u662f\u5148\u5c07\u6bcf\u5f35\u5716\u6b63\u898f\u5316\u5230448*448\u7684\u5c3a\u5bf8\uff0c\u63a5\u8457\u5c07\u9019\u5f35\u5716\u8f38\u5165\u7db2\u8def\u9032\u884c\u904b\u7b97\uff0c\u5728\u89e3\u8b80\u6700\u5f8c\u4e00\u5c64\u7684tesnor\u5f8c\uff0c\u5373\u53ef\u5b8c\u6210\u5075\u6e2c\uff0c\u800c\u9019\u6a23\u904b\u7b97\u6a21\u5f0f\u8207\u5f71\u50cf\u5206\u985eCNN\u5e7e\u4e4e\u4e00\u6a23\uff0c\u6240\u4ee5\u624d\u80fd\u9054\u5230\u5373\u6642\u904b\u7b97\u3002<\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n

YOLO\u7684\u5177\u9ad4\u5be6\u73fe\u65b9\u5f0f\u57fa\u672c\u4e0a\u5c31\u662f\u5c07\u5716\u5206\u6210\u5f88\u591a\u500bgrid cell\uff0c\u5982\u4e0b\u5716\u6240\u793a\uff0c\u6bcf\u500bgrid cell\u8ca0\u8cac\u5b78\u7fd2\u91cd\u5fc3\u843d\u5728\u6b64grid cell\u4e0a\u7684\u7269\u9ad4\u7684\u985e\u5225\u3001\u5927\u5c0f\u4ee5\u53ca\u4f4d\u7f6e\uff0c\u4ee5PASCAL VOC(20\u985e)\u6b64dataset\u70ba\u4f8b\uff0cYOLO\u7684\u8a2d\u5b9a\u662fS=7\uff0cB=2\uff0cC=20\uff0c\u4e5f\u5c31\u662f\u6bcf\u500bgrid cell\u53ef\u4ee5\u5075\u6e2c\u5169\u500b\u540c\u985e\u578b\u7684\u7269\u9ad4\uff0c\u6574\u5f35\u5716\u5171\u67097*7\u500bgrid cell\uff0c\u6700\u5f8c\u8f38\u51fa\u7684tensor\u70baS<\/em>\u00d7S<\/em>\u00d7(B<\/em>\u00d75+C<\/em>)\uff0c\u4e5f\u5c31\u662f7\u00d77\u00d7(2\u00d75+20)=\n7\u00d77\u00d730=1470\u3002<\/p>\n\n\n\n

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YOLO\u4f5c\u8005\u7528ImageNet 2012\u6b64dataset\u4f86\u9810\u8a13\u7df4(pretrain)\u6a21\u578b\uff0c\u6b64\u6a21\u578b\u7684top-5 accuracy\u9054\u5230\u4e8688%\uff0c\u800c\u4e14\u4f5c\u8005\u81ea\u884c\u958b\u767c\u4e86\u4e00\u500b\u6df1\u5ea6\u5b78\u7fd2\u7684\u6846\u67b6\uff0c\u7a31\u70baDarknet\uff0c\u4e26\u5c07YOLO\u5be6\u73fe\u5728Darknet\u4e0a\u3002<\/p>\n\n\n\n

YOLO\u7684loss function \u5982\u4e0b\uff0c\u5176\u5be6\u4e26\u4e0d\u8907\u96dc\uff0c\u4f46\u4f5c\u8005\u5728\u958b\u767c\u7684\u904e\u7a0b\u4e2d\u767c\u73fe\u5927\u591a\u6578\u7684grid cell \u5167\u6c92\u6709\u7269\u4ef6\uff0c\u6240\u4ee5\u6709\u7269\u4ef6\u7684grid cell\u53cd\u800c\u8a13\u7df4\u6548\u679c\u4e0d\u4f73\uff0c\u70ba\u4e86\u89e3\u6c7a\u9019\u500b\u554f\u984c\uff0c\u4f5c\u8005\u589e\u52a0\u4e86\u5728bounding box\u5ea7\u6a19\u9810\u6e2c\u7684loss\u6b0a\u91cd (\u03bbcoord=5)\u4e26\u964d\u4f4e\u90a3\u4e9b\u4e0d\u5305\u542b\u7269\u4ef6\u7684grid cell\uff0c\u6240\u5c0d\u61c9\u7684confidence\u6b0a\u91cd(\u03bbnoobj=0.5)\u3002<\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n

\u76f8\u8f03\u65bcFaster R-CNN\uff0cYOLO\u7684\u8fa8\u8b58\u7387\u4f4e\u4e8610%\uff0c\u4f46\u901f\u5ea6\u5feb\u516d\u500d\u591a\uff0c\u9019\u53ef\u8b02\u662f\u4e00\u76f8\u7576\u5177\u6709\u8ca2\u737b\u7684\u7a81\u7834\uff0c\u800cFast YOLO\u901f\u5ea6\u9032\u4e00\u6b65\u7684\u9054\u5230\u4e86155 FPS\uff0c\u53ea\u662f\u8fa8\u8b58\u7387\u53c8\u518d\u964d\u4e8610%\u3002<\/p>\n\n\n\n

YOLO\u8ad6\u6587\u8a73\u7d30\u5206\u6790\u4e86\u5176\u8207Fast R-CNN\u5728\u7269\u4ef6\u5075\u6e2c\u4e0a\u932f\u8aa4\u7684\u5dee\u7570\uff0c\u5982\u4e0b\u5716\u6240\u793a\uff0c\u76f8\u8f03\u65bcFast R-CNN\uff0cYOLO\u5728\u80cc\u666f\u7684\u72af\u932f\u7387\u8f03\u5c0f\uff0c\u4e5f\u5c31\u662f\u6bd4\u8f03\u4e0d\u6703\u6709false-positive\uff0c\u4f46bounding box\u4e0d\u5920\u6e96\u78ba\uff0c\u4e5f\u5c31\u662fIOU\u4ecb\u65bc0.1\u82070.5\u9593\u3002 <\/p>\n\n\n\n

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\u82e5\u662f\u9032\u4e00\u6b65\u7684\u7d50\u5408Fast R-CNN\u4ee5\u53caYOLO\u7684\u5075\u6e2c\u7d50\u679c\uff0cFast R-CNN\u7684\u8fa8\u8b58\u7387\u53ef\u63d0\u53473.2%\uff0c\u5982\u4e0b\u5716\u6240\u793a\u3002<\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n

YOLO\u662f\u7b2c\u4e00\u500bone stage\u7684\u7269\u4ef6\u5075\u6e2c\u6a21\u578b\uff0c\u5176\u901f\u5ea6\u5373\u4f7f\u5728\u5d4c\u5165\u5f0f\u7cfb\u7d71\u6216\u662f\u624b\u6a5f\u4e0a\u4e5f\u80fd\u9054\u5230\u5373\u6642\u904b\u7b97\uff0c\u56e0\u6b64\uff0c\u9019\u6a23\u7684\u67b6\u69cb\u73fe\u5728\u5ee3\u70ba\u5148\u9032\u99d5\u99db\u8f14\u52a9\u7cfb\u7d71\u6216\u662f\u81ea\u99d5\u8eca\u6240\u7528\uff0cYOLO\u7684\u51fa\u73fe\u5e36\u8d77\u4e86\u5f8c\u7e8c\u5176\u5b83one stage\u6a21\u578b\u7684\u958b\u767c\u71b1\u6f6e\uff0c\u800c\u9019\u985e\u6a21\u578b\u7684\u5f8c\u7e8c\u9032\u5c55\u5c31\u6709\u5f85\u4e0b\u4e00\u7bc7\u6587\u7ae0\u518d\u4f86\u597d\u597d\u4ecb\u7d39\u3002<\/p>\n\n\n\n

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