{"id":114,"date":"2019-11-21T14:41:12","date_gmt":"2019-11-21T06:41:12","guid":{"rendered":"http:\/\/123.57.142.208\/?p=114"},"modified":"2019-11-21T14:41:12","modified_gmt":"2019-11-21T06:41:12","slug":"114","status":"publish","type":"post","link":"http:\/\/43.142.23.155\/?p=114","title":{"rendered":"DL-004-Faster RCNN"},"content":{"rendered":"<p>faster\uff0c\u4e00\u542c\u5c31\u662f\u6709\u6bd4\u8f83\u624d\u6709\u7684er\uff0c\u6240\u4ee5\u8bf4\u5230faster RCNN\u5982\u679c\u53ea\u5b57\u4e0d\u63d0fast RCNN\uff0c\u6050\u6015\u5c31\u6293\u4e0d\u5230faster\u7684\u672c\u8d28\u548c\u5176\u6700\u6838\u5fc3\u7684\u70b9\u3002\u6240\u4ee5\u5efa\u8bae\u4e0efastRCNN\u914d\u5408\u670d\u7528\u6700\u4f73\u3002<\/p>\n<p>\u4e00\u8a00\u4e0d\u5408\u5148\u4e0a\u56fe\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-118\" src=\"http:\/\/39.107.80.187\/wp-content\/uploads\/2019\/11\/QQ\u622a\u56fe20191121120041.png\" alt=\"\" width=\"1738\" height=\"920\" srcset=\"http:\/\/43.142.23.155\/wp-content\/uploads\/2019\/11\/QQ\u622a\u56fe20191121120041.png 1738w, http:\/\/43.142.23.155\/wp-content\/uploads\/2019\/11\/QQ\u622a\u56fe20191121120041-300x159.png 300w, http:\/\/43.142.23.155\/wp-content\/uploads\/2019\/11\/QQ\u622a\u56fe20191121120041-1024x542.png 1024w, http:\/\/43.142.23.155\/wp-content\/uploads\/2019\/11\/QQ\u622a\u56fe20191121120041-768x407.png 768w, http:\/\/43.142.23.155\/wp-content\/uploads\/2019\/11\/QQ\u622a\u56fe20191121120041-1536x813.png 1536w, http:\/\/43.142.23.155\/wp-content\/uploads\/2019\/11\/QQ\u622a\u56fe20191121120041-1568x830.png 1568w\" sizes=\"auto, (max-width: 1738px) 100vw, 1738px\" \/><\/p>\n<p>\u56fe\u6e90\u7f51\u7edc\uff0c\u4fb5\u5220<\/p>\n<p>1\uff09\u5377\u79ef\u5c42(conv layers)\uff0c\u7528\u4e8e\u63d0\u53d6\u56fe\u7247\u7684\u7279\u5f81\uff0c\u8f93\u5165\u4e3a\u6574\u5f20\u56fe\u7247\uff0c\u8f93\u51fa\u4e3a\u63d0\u53d6\u51fa\u7684\u7279\u5f81\u79f0\u4e3afeature maps<br 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height=\"682\" \/><\/p>\n<p>\uff08\u8fd9\u56fe\u8fd8\u771f\u662f\u54ea\u91cc\u90fd\u6709\u3002\u3002\u3002<\/p>\n<p><strong>RPN\u7f51\u7edc\u672c\u8d28=CNN+3*3<em>\u7684\u5377\u79ef\u5c42+\u4e24\u4e2a1*1<\/em>\u7684\u5377\u79ef\u5c42(\u4e24\u4e2a\u5377\u79ef\u5c42\u7684\u5173\u7cfb\u4e3asibling\uff0c\u5206\u522b\u662f\u7528\u6765\u7ed9softmax\u5c42\u8fdb\u884c\u5206\u7c7b\uff0c\u548c\u7528\u4e8e\u7ed9\u5019\u9009\u533a\u57df\u7cbe\u786e\u5b9a\u4f4d\uff09\u3002<\/strong><\/p>\n<p>\u8fd9\u4e2a\u80cc\u540e\u7684\u539f\u7406\u5462\uff1f\u6211\u4eec\u53ea\u77e5\u9053\u6548\u679c\u8fd8\u662f\u4e0d\u884c\u7684\uff0c\u60f3\u8981\u63d0\u9ad8\u8fd8\u662f\u8981\u5b66\u4e60\u539f\u7406\u3002<\/p>\n<p>\u8fd8\u6709\u4e2a\u95ee\u9898\uff0cCNN\u8f93\u51fa\u7684feature map\u600e\u4e48\u53ef\u4ee5\u901a\u8fc7RPN\u7684\u540e\u7eed\u5904\u7406\u5f97\u5230\u4e0e\u539f\u56fe\u5bf9\u5e94\u7684\u5019\u9009\u533a\u57df\u7684\uff0c\u5373RPN\u8f93\u51fa\u7684\u5019\u9009\u533a\u57df\u548csoftmax\u7684\u7ed3\u6784\u600e\u4e48\u4e0e\u539f\u56fe\u4e2d\u7684\u533a\u57df\u8fdb\u884c\u5bf9\u5e94\u7684\uff1f\u8fd9\u4e2a\u5bf9\u5e94\u5173\u7cfb\u662f\u600e\u4e48\u5f97\u5230\u7684\uff1f<\/p>\n<p>\u5148\u6765\u770b\u4e00\u4e0b\uff0c\u951a????\u2014\u2014anchor,\u6211\u8bb0\u5f97\u6700\u5f00\u59cb\u6211\u6df1\u5ea6\u63a5\u89e6\u8fd9\u4e2a\u5bb6\u4f19\u5e94\u8be5\u662f\u4ece\u7cfb\u7edf\u5b66\u4e60YOLO\u7684Pytorch\u6846\u67b6\u5f00\u59cb\u7684\uff1f<\/p>\n<p>\u6240\u4ee5anchor\u7684\u672c\u8d28\u662f\u4ec0\u4e48\u5462\uff1f\u6709\u4e00\u79cd\u7406\u89e3\uff1a\u662fSPP(spatial pyramid pooling)\u601d\u60f3\u7684\u9006\u5411\uff0c\u611f\u89c9\u751a\u662f\u6709\u7406\u3002<\/p>\n<p>SPP\u7684\u7b14\u8bb0\u5728\u524d\u9762\u4e5f\u6709\u6240\u8bb0\u5f55\uff08\u7a81\u7136\u770b\u5230\u4e86\u6309\u7167\u65f6\u95f4\u987a\u5e8f\u770b\u8bba\u6587\u505a\u7b14\u8bb0\u7684\u597d\u5904\uff0c\u53d1\u73b0\u4e86\u4e0d\u5c11\u4e4b\u524d\u6ca1\u6709\u6ce8\u610f\u8fc7\u7684\uff0c\u6216\u8bb8\u5c31\u7406\u89e3\u4e86\u5927\u4f6c\u4eec\u5bf9\u7b97\u6cd5\u6846\u67b6\u4fee\u6539\u7684\u4e00\u4e9b\u7075\u611f\uff09\u6240\u4ee5\u7531\u4e8eSPP\u662f\u5c06\u4e0d\u540c\u5c3a\u5bf8\u7684\u8f93\u5165resize\u6210\u76f8\u540c\u5c3a\u5bf8\u7684\u8f93\u51fa\uff0c\u5176\u9006\u5411\u5c31\u662f\uff0c<strong>\u5c06\u76f8\u540c\u5c3a\u5bf8\u7684\u8f93\u51fa\uff0c\u5012\u63a8\u5f97\u5230\u4e0d\u540c\u5c3a\u5bf8\u7684\u8f93\u5165\u3002<\/strong><\/p>\n<p>\u5173\u4e8eanchor\u7684\u5c3a\u5bf8\u6837\u5b50\uff1a\u4e09\u4e2a\u9762\u79ef\u5c3a\u5bf8\uff08128^2\uff0c256^2\uff0c512^2\uff09\uff0c\u7136\u540e\u5728\u6bcf\u4e2a\u9762\u79ef\u5c3a\u5bf8\u4e0b\uff0c\u53d6\u4e09\u79cd\u4e0d\u540c\u7684\u957f\u5bbd\u6bd4\u4f8b\uff081:1,1:2,2:1\uff09\uff0c\u4e8e\u662f\u51fa\u73b0\u4e869\u4e2a\u957f\u5f97\u4e0d\u4e00\u6837\u7684anchor\uff1a<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-120\" src=\"http:\/\/123.57.142.208\/wp-content\/uploads\/2019\/11\/20191105195816143.png\" alt=\"\" width=\"920\" height=\"768\" \/><\/p>\n<p>\u56fe\u6e90\u7f51\u7edc\uff0c\u4fb5\u5220<\/p>\n<p>\u5982\u679c\u8bf4anchor\u7684\u4f7f\u7528\u662f\u7406\u89e3\u7684\u6838\u5fc3\uff0c\u90a3\u4e48anchor\u7684\u6ed1\u52a8\u5219\u662f\u5173\u952e\u3002<\/p>\n<p>\u5728anchor\u5f00\u59cb\u5904\u7406\u7684\u65f6\u5019\uff0c\u539f\u59cb\u56fe\u7247\u5df2\u7ecf\u7ecf\u8fc7\u4e00\u7cfb\u5217\u5377\u79ef\u5c42\u548c\u6c60\u5316\u5c42\u4ee5\u53carelu\uff0c\u5f97\u5230\u4e86\u8fd9\u91cc\u7684 feature\uff1a51x39x256<\/p>\n<p>\u5728\u8fd9\u4e2a\u7279\u5f81\u53c2\u6570\u7684\u57fa\u7840\u4e0a\uff0c\u901a\u8fc7\u4e00\u4e2a3&#215;3\u7684\u6ed1\u52a8\u7a97\u53e3\uff0c\u5728\u8fd9\u4e2a51&#215;39\u7684\u533a\u57df\u4e0a\u8fdb\u884c\u6ed1\u52a8\uff0cstride=1\uff0cpadding=2\uff0c\u8fd9\u6837\u4e00\u6765\uff0c\u6ed1\u52a8\u5f97\u5230\u7684\u5c31\u662f51&#215;39\u4e2a3&#215;3\u7684\u7a97\u53e3\uff08\u6ca1\u6bdb\u75c5\u5427\uff09<\/p>\n<p>\u5bf9\u4e8e\u6bcf\u4e2a3&#215;3\u7684\u7a97\u53e3\uff0c\u8bba\u6587\u4f5c\u8005\u5c31\u8ba1\u7b97\u8fd9\u4e2a\u6ed1\u52a8\u7a97\u53e3\u7684\u4e2d\u5fc3\u70b9\u6240\u5bf9\u5e94\u7684\u539f\u59cb\u56fe\u7247\u7684\u4e2d\u5fc3\u70b9\uff08\u5bf9\u8fd9\u4e2a\u4e2d\u5fc3\u70b9\u7684\u7406\u89e3\u4e5f\u5f88\u5173\u952e\uff0c\u4e00\u5ea6\u8ff7\u60d1\u7740\u6211\uff09\u3002\u7136\u540e\u5047\u5b9a\uff0c\u8fd9\u4e2a3&#215;3\u7a97\u53e3\uff0c\u662f\u4ece\u539f\u59cb\u56fe\u7247\u4e0a\u901a\u8fc7SPP\u6c60\u5316\u5f97\u5230\u7684\uff0c\u800c\u8fd9\u4e2a\u6c60\u5316\u7684\u533a\u57df\u7684\u9762\u79ef\u4ee5\u53ca\u6bd4\u4f8b\uff0c\u5c31\u662f\u4e00\u4e2a\u4e2a\u7684anchor\u3002<\/p>\n<p><strong>\u6362\u53e5\u8bdd\u8bf4\uff0c\u5bf9\u4e8e\u6bcf\u4e2a3&#215;3\u7a97\u53e3\uff0c\u6211\u4eec\u5047\u5b9a\u5b83\u6765\u81ea9\u79cd\u4e0d\u540c\u539f\u59cb\u533a\u57df\u7684\u6c60\u5316\uff0c\u4f46\u662f\u8fd9\u4e9b\u6c60\u5316\u5728\u539f\u59cb\u56fe\u7247\u4e2d\u7684\u4e2d\u5fc3\u70b9\uff0c\u90fd\u5b8c\u5168\u4e00\u6837\u3002\u8fd9\u4e2a\u4e2d\u5fc3\u70b9\uff0c\u5c31\u662f\u521a\u624d\u63d0\u5230\u7684\uff0c3&#215;3\u7a97\u53e3\u4e2d\u5fc3\u70b9\u6240\u5bf9\u5e94\u7684\u539f\u59cb\u56fe\u7247\u4e2d\u7684\u4e2d\u5fc3\u70b9\u3002<\/strong><\/p>\n<p>\u6240\u4ee5\uff0c<strong>\u5728\u6bcf\u4e2a\u7a97\u53e3\u4f4d\u7f6e\uff0c\u6211\u4eec\u90fd\u53ef\u4ee5\u6839\u636e9\u4e2a\u4e0d\u540c\u957f\u5bbd\u6bd4\u4f8b\u3001\u4e0d\u540c\u9762\u79ef\u7684anchor\uff0c\u9006\u5411\u63a8\u5bfc\u51fa\u5b83\u6240\u5bf9\u5e94\u7684\u539f\u59cb\u56fe\u7247\u4e2d\u7684\u4e00\u4e2a\u533a\u57df\uff0c\u8fd9\u4e2a\u533a\u57df\u7684\u5c3a\u5bf8\u4ee5\u53ca\u5750\u6807\uff0c\u90fd\u662f\u5df2\u77e5\u7684\u3002<\/strong>(\u83ab\u540d\u7684\u60f3\u5230\u4e86\u52a0\u5bc6\u5bc6\u94a5\u3002\u3002\u548c\u5b83\u6070\u6070\u4e0d\u540c\uff09<\/p>\n<p>\u800c\u8fd9\u4e2a\u533a\u57df\uff0c\u5c31\u662f\u6211\u4eec\u60f3\u8981\u7684 proposal\u3002<\/p>\n<p>\u6240\u4ee5\u6211\u4eec\u901a\u8fc7\u6ed1\u52a8\u7a97\u53e3\u548canchor\uff0c\u6210\u529f\u5f97\u5230\u4e86 51x39x9 \u4e2a<em>\u539f\u59cb\u56fe\u7247\u7684proposal<\/em>\u3002\u7136\u540e\u6bcf\u4e2aproposal\u8f93\u51fa6\u4e2a\u53c2\u6570\uff1a\u6bcf\u4e2a proposal \u548c ground truth \u8fdb\u884c\u6bd4\u8f83\u5f97\u5230\u7684\u524d\u666f\u6982\u7387\u548c\u80cc\u666f\u6982\u7387(2\u4e2a\u53c2\u6570\uff09\uff08\u5bf9\u5e94 cls_score\uff09\uff1b\u7531\u4e8e\u6bcf\u4e2a proposal \u548c ground truth \u4f4d\u7f6e\u53ca\u5c3a\u5bf8\u4e0a\u7684\u5dee\u5f02\uff0c\u4ece proposal \u901a\u8fc7\u5e73\u79fb\u653e\u7f29\u5f97\u5230 ground truth \u9700\u8981\u76844\u4e2a\u5e73\u79fb\u653e\u7f29\u53c2\u6570\uff08\u5bf9\u5e94bbox_pred\uff09\u3002<\/p>\n<p>\u6240\u4ee5\u6211\u4eec\u4e00\u5171\u5f97\u523051*39*9=17900\u4e86\u4e2aanchor 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