{"id":991,"date":"2022-01-02T13:40:50","date_gmt":"2022-01-02T05:40:50","guid":{"rendered":"http:\/\/139.9.1.231\/?p=991"},"modified":"2022-08-29T16:15:28","modified_gmt":"2022-08-29T08:15:28","slug":"yolov1","status":"publish","type":"post","link":"http:\/\/139.9.1.231\/index.php\/2022\/01\/02\/yolov1\/","title":{"rendered":"YOLO\u7cfb\u5217\uff08\u4e8c\uff09\uff1ayolov1"},"content":{"rendered":"\n<p> YOLOv1\u5c5e\u4e8e\u4e00\u9636\u6bb5\u3001<strong>anchor-free\u00a0\u76ee\u6807\u68c0\u6d4b<\/strong> <\/p>\n\n\n\n<p>      \u6574\u4f53\u6765\u770b\uff0cYolo\u7b97\u6cd5\u91c7\u7528\u4e00\u4e2a\u5355\u72ec\u7684CNN\u6a21\u578b\u5b9e\u73b0end-to-end\u7684\u76ee\u6807\u68c0\u6d4b\uff0c\u6574\u4e2a\u7cfb\u7edf\u5982\u56fe5\u6240\u793a\uff1a\u9996\u5148\u5c06\u8f93\u5165\u56fe\u7247resize\u5230448&#215;448\uff0c\u7136\u540e\u9001\u5165CNN\u7f51\u7edc\uff0c\u6700\u540e\u5904\u7406\u7f51\u7edc\u9884\u6d4b\u7ed3\u679c\u5f97\u5230\u68c0\u6d4b\u7684\u76ee\u6807\u3002\u76f8\u6bd4R-CNN\u7b97\u6cd5\uff0c\u5176\u662f\u4e00\u4e2a\u7edf\u4e00\u7684\u6846\u67b6\uff0c\u5176\u901f\u5ea6\u66f4\u5feb\uff0c\u800c\u4e14Yolo\u7684\u8bad\u7ec3\u8fc7\u7a0b\u4e5f\u662fend-to-end\u7684\u3002<\/p>\n\n\n\n<p>\u5177\u4f53\u6765\u8bf4\uff0cYolo\u7684CNN\u7f51\u7edc\u5c06\u8f93\u5165\u7684\u56fe\u7247\u5206\u5272\u6210 \\(S \\times S\\) \u7f51\u683c\uff0c\u7136\u540e\u6bcf\u4e2a\u5355\u5143\u683c\u8d1f\u8d23\u53bb\u68c0\u6d4b\u90a3\u4e9b \u4e2d\u5fc3\u70b9\u843d\u5728\u8be5\u683c\u5b50\u5185\u7684\u76ee\u6807\uff0c\u5982\u56fe6\u6240\u793a\uff0c\u53ef\u4ee5\u770b\u5230\u72d7\u8fd9\u4e2a\u76ee\u6807\u7684\u4e2d\u5fc3\u843d\u5728\u5de6\u4e0b\u89d2\u4e00\u4e2a\u5355\u5143\u683c\u5185\uff0c \u90a3\u4e48\u8be5\u5355\u5143\u683c\u8d1f\u8d23\u9884\u6d4b\u8fd9\u4e2a\u72d7\u3002\u6bcf\u4e2a\u5355\u5143\u683c\u4f1a\u9884\u6d4b \\(B\\) \u4e2a\u8fb9\u754c\u6846 (bounding box) \u4ee5\u53ca\u8fb9\u754c\u6846\u7684 \u7f6e\u4fe1\u5ea6 (confidence score) \u3002\u6240\u8c13\u7f6e\u4fe1\u5ea6\u5176\u5b9e\u5305\u542b\u4e24\u4e2a\u65b9\u9762\uff0c\u4e00\u662f\u8fd9\u4e2a\u8fb9\u754c\u6846\u542b\u6709\u76ee\u6807\u7684\u53ef\u80fd\u6027 \u5927\u5c0f\uff0c\u4e8c\u662f\u8fd9\u4e2a\u8fb9\u754c\u6846\u7684\u51c6\u786e\u5ea6\u3002\u524d\u8005\u8bb0\u4e3a \\(\\operatorname{Pr}(object)\\) \uff0c\u5f53\u8be5\u8fb9\u754c\u6846\u662f\u80cc\u666f\u65f6 (\u5373\u4e0d\u5305\u542b\u76ee \u6807)\uff0c\u6b64\u65f6 \\(\\operatorname{Pr}(object)=0\\) \u3002\u800c\u5f53\u8be5\u8fb9\u754c\u6846\u5305\u542b\u76ee\u6807\u65f6\uff0c \\(\\operatorname{Pr}(object)=1\\) \u3002\u8fb9\u754c\u6846\u7684\u51c6 \u786e\u5ea6\u53ef\u4ee5\u7528\u9884\u6d4b\u6846\u4e0e\u5b9e\u9645\u6846 (ground truth) \u7684IOU (intersection over union\uff0c\u4ea4\u5e76\u6bd4) \u6765\u8868 \u5f81\uff0c\u8bb0\u4e3a \\(\\mathrm{IOU}{\\text {pred }}^{\\text {truth }}\\) \u3002\u56e0\u6b64\u7f6e\u4fe1\u5ea6\u53ef\u4ee5\u5b9a\u4e49\u4e3a \\(\\operatorname{Pr}(object) * \\mathrm{IOU}{\\text {pred }}^{\\text {truth }}\\) \u3002\u5f88\u591a\u4eba\u53ef\u80fd\u5c06Yolo \u7684\u7f6e\u4fe1\u5ea6\u770b\u6210\u8fb9\u754c\u6846\u662f\u5426\u542b\u6709\u76ee\u6807\u7684\u6982\u7387\uff0c\u4f46\u662f\u5176\u5b9e\u5b83\u662f\u4e24\u4e2a\u56e0\u5b50\u7684\u4e58\u79ef\uff0c\u9884\u6d4b\u6846\u7684\u51c6\u786e\u5ea6\u4e5f\u53cd\u6620 \u5728\u91cc\u9762\u3002\u8fb9\u754c\u6846\u7684\u5927\u5c0f\u4e0e\u4f4d\u7f6e\u53ef\u4ee5\u75284\u4e2a\u503c\u6765\u8868\u5f81: (x, y, w, h)\uff0c\u5176\u4e2d (x, y) \u662f\u8fb9\u754c\u6846\u7684\u4e2d \u5fc3\u5750\u6807\uff0c\u800c w\u548c h \u662f\u8fb9\u754c\u6846\u7684\u5bbd\u4e0e\u9ad8\u3002\u8fd8\u6709\u4e00\u70b9\u8981\u6ce8\u610f\uff0c\u4e2d\u5fc3\u5750\u6807\u7684\u9884\u6d4b\u503c (x, y) \u662f\u76f8\u5bf9\u4e8e \u6bcf\u4e2a\u5355\u5143\u683c\u5de6\u4e0a\u89d2\u5750\u6807\u70b9\u7684\u504f\u79fb\u503c\uff0c\u5e76\u4e14\u5355\u4f4d\u662f\u76f8\u5bf9\u4e8e\u5355\u5143\u683c\u5927\u5c0f\u7684\uff0c\u5355\u5143\u683c\u7684\u5750\u6807\u5b9a\u4e49\u5982\u56fe6\u6240 \u793a\u3002\u800c\u8fb9\u754c\u6846\u7684 \\(w\\) \u548c \\(h\\) \u9884\u6d4b\u503c\u662f\u76f8\u5bf9\u4e8e\u6574\u4e2a\u56fe\u7247\u7684\u5bbd\u4e0e\u9ad8\u7684\u6bd4\u4f8b\uff0c\u8fd9\u6837\u7406\u8bba\u4e0a4\u4e2a\u5143\u7d20\u7684\u5927\u5c0f \u5e94\u8be5\u5728 \\([0,1]\\) \u8303\u56f4\u3002\u8fd9\u6837\uff0c\u6bcf\u4e2a\u8fb9\u754c\u6846\u7684\u9884\u6d4b\u503c\u5b9e\u9645\u4e0a\u5305\u542b 5 \u4e2a\u5143\u7d20: \\((x, y, w, h, c)\\) \uff0c\u5176\u4e2d \\((x, y)\\) \u662f\u8fb9\u754c\u6846\u7684\u4e2d \u5fc3\u5750\u6807\uff0c\u800c \\(w\\) \u548c \\(h\\) \u662f\u8fb9\u754c\u6846\u7684\u5bbd\u4e0e\u9ad8\u3002\u8fd8\u6709\u4e00\u70b9\u8981\u6ce8\u610f\uff0c\u4e2d\u5fc3\u5750\u6807\u7684\u9884\u6d4b\u503c \\((x, y)\\) \u662f\u76f8\u5bf9\u4e8e \u6bcf\u4e2a\u5355\u5143\u683c\u5de6\u4e0a\u89d2\u5750\u6807\u70b9\u7684\u504f\u79fb\u503c\uff0c\u5e76\u4e14\u5355\u4f4d\u662f\u76f8\u5bf9\u4e8e\u5355\u5143\u683c\u5927\u5c0f\u7684\uff0c\u5355\u5143\u683c\u7684\u5750\u6807\u5b9a\u4e49\u5982\u56fe\u6240\u793a\u3002\u800c\u8fb9\u754c\u6846\u7684\\(w\\) \u548c \\(h\\) \u9884\u6d4b\u503c\u662f\u76f8\u5bf9\u4e8e\u6574\u4e2a\u56fe\u7247\u7684\u5bbd\u4e0e\u9ad8\u7684\u6bd4\u4f8b\uff0c\u8fd9\u6837\u7406\u8bba\u4e0a4\u4e2a\u5143\u7d20\u7684\u5927\u5c0f \u5e94\u8be5\u5728 \\([0,1]\\) \u8303\u56f4\u3002\u8fd9\u6837\uff0c\u6bcf\u4e2a\u8fb9\u754c\u6846\u7684\u9884\u6d4b\u503c\u5b9e\u9645\u4e0a\u5305\u542b 5 \u4e2a\u5143\u7d20: \\((x, y, w, h, c)\\) \uff0c\u5176\u4e2d \u524d 4 \u4e2a\u8868\u5f81\u8fb9\u754c\u6846\u7684\u5927\u5c0f\u4e0e\u4f4d\u7f6e\uff0c\u800c\u6700\u540e\u4e00\u4e2a\u503c\u662f\u7f6e\u4fe1\u5ea6\u3002<\/p>\n\n\n\n<div class=\"wp-block-image is-style-default\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" src=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/01\/v2-fdfea5fcb4ff3ecc327758878e4ad6e1_720w.jpg\" alt=\"\" class=\"wp-image-1089\" width=\"344\" height=\"343\" srcset=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/01\/v2-fdfea5fcb4ff3ecc327758878e4ad6e1_720w.jpg 720w, http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/01\/v2-fdfea5fcb4ff3ecc327758878e4ad6e1_720w-300x300.jpg 300w, http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/01\/v2-fdfea5fcb4ff3ecc327758878e4ad6e1_720w-150x150.jpg 150w, http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/01\/v2-fdfea5fcb4ff3ecc327758878e4ad6e1_720w-120x120.jpg 120w\" sizes=\"(max-width: 344px) 100vw, 344px\" \/><\/figure><\/div>\n\n\n\n<p>\u8fd8\u6709\u5206\u7c7b\u95ee\u9898\uff0c\u5bf9\u4e8e\u6bcf\u4e00\u4e2a\u5355\u5143\u683c\u5176\u8fd8\u8981\u7ed9\u51fa\u9884\u6d4b\u51fa C\u4e2a\u7c7b\u522b\u6982\u7387\u503c\uff0c\u5176\u8868\u5f81\u7684\u662f\u7531\u8be5\u5355\u5143\u683c\u8d1f \u8d23\u9884\u6d4b\u7684\u8fb9\u754c\u6846\u5176\u76ee\u6807\u5c5e\u4e8e\u5404\u4e2a\u7c7b\u522b\u7684\u6982\u7387\u3002\u4f46\u662f\u8fd9\u4e9b\u6982\u7387\u503c\u5176\u5b9e\u662f\u5728\u5404\u4e2a\u8fb9\u754c\u6846\u7f6e\u4fe1\u5ea6\u4e0b\u7684\u6761\u4ef6 \u6982\u7387\uff0c\u5373 \\(\\operatorname{Pr}\\left(\\right. class _{i} \\mid object )\\) \u3002\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c\u4e0d\u7ba1\u4e00\u4e2a\u5355\u5143\u683c\u9884\u6d4b\u591a\u5c11\u4e2a\u8fb9\u754c\u6846\uff0c\u5176\u53ea\u9884\u6d4b \u4e00\u7ec4\u7c7b\u522b\u6982\u7387\u503c\uff0c\u8fd9\u662fYolo\u7b97\u6cd5\u7684\u4e00\u4e2a\u7f3a\u70b9\uff0c\u5728\u540e\u6765\u7684\u6539\u8fdb\u7248\u672c\u4e2d\uff0cYolo9000\u662f\u628a\u7c7b\u522b\u6982\u7387\u9884\u6d4b \u503c\u4e0e\u8fb9\u754c\u6846\u662f\u7ed1\u5b9a\u5728\u4e00\u8d77\u7684\u3002\u540c\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u8ba1\u7b97\u51fa\u5404\u4e2a\u8fb9\u754c\u6846\u7c7b\u522b\u7f6e\u4fe1\u5ea6\uff08class-specific confidence scores):<br><\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-style-default\"><img loading=\"lazy\" width=\"999\" height=\"53\" src=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/01\/image-3.png\" alt=\"\" class=\"wp-image-1101\" srcset=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/01\/image-3.png 999w, http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/01\/image-3-300x16.png 300w, http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/01\/image-3-768x41.png 768w\" sizes=\"(max-width: 999px) 100vw, 999px\" \/><\/figure>\n\n\n\n<p><br>\u8fb9\u754c\u6846\u7c7b\u522b\u7f6e\u4fe1\u5ea6\u8868\u5f81\u7684\u662f\u8be5\u8fb9\u754c\u6846\u4e2d\u76ee\u6807\u5c5e\u4e8e\u5404\u4e2a\u7c7b\u522b\u7684\u53ef\u80fd\u6027\u5927\u5c0f\u4ee5\u53ca\u8fb9\u754c\u6846\u5339\u914d\u76ee\u6807\u7684\u597d \u574f\u3002\u540e\u9762\u4f1a\u8bf4\uff0c\u4e00\u822c\u4f1a\u6839\u636e\u7c7b\u522b\u7f6e\u4fe1\u5ea6\u6765\u8fc7\u6ee4\u7f51\u7edc\u7684\u9884\u6d4b\u6846\u3002<br>\u603b\u7ed3\u4e00\u4e0b\uff0c\u6bcf\u4e2a\u5355\u5143\u683c\u9700\u8981\u9884\u6d4b \\((B * 5+C)\\) \u4e2a\u503c\u3002\u5982\u679c\u5c06\u8f93\u5165\u56fe\u7247\u5212\u5206\u4e3a \\(S \\times S\\) \u7f51\u683c\uff0c\u90a3 \u4e48\u6700\u7ec8\u9884\u6d4b\u503c\u4e3a \\(S \\times S \\times(B * 5+C)\\) \u5927\u5c0f\u7684\u5f20\u91cf\u3002\u6574\u4e2a\u6a21\u578b\u7684\u9884\u6d4b\u503c\u7ed3\u6784\u5982\u4e0b\u56fe\u6240\u793a\u3002\u5bf9 \u4e8ePASCAL VOC\u6570\u636e\uff0c\u5176\u5171\u670920\u4e2a\u7c7b\u522b\uff0c\u5982\u679c\u4f7f\u7528 \\(S=7, B=2\\) \uff0c\u90a3\u4e48\u6700\u7ec8\u7684\u9884\u6d4b\u7ed3\u679c\u5c31\u662f \\(7 \\times 7 \\times 30\\) \u5927\u5c0f\u7684\u5f20\u91cf\u3002\u5728\u4e0b\u9762\u7684\u7f51\u7edc\u7ed3\u6784\u4e2d\u6211\u4eec\u4f1a\u8be6\u7ec6\u8bb2\u8ff0\u6bcf\u4e2a\u5355\u5143\u683c\u7684\u9884\u6d4b\u503c\u7684\u5206\u5e03\u4f4d \u7f6e\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-style-default\"><img loading=\"lazy\" width=\"664\" height=\"435\" src=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/01\/image-4.png\" alt=\"\" class=\"wp-image-1102\" srcset=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/01\/image-4.png 664w, http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/01\/image-4-300x197.png 300w\" sizes=\"(max-width: 664px) 100vw, 664px\" \/><\/figure>\n\n\n\n<p>Yolo\u91c7\u7528\u5377\u79ef\u7f51\u7edc\u6765\u63d0\u53d6\u7279\u5f81\uff0c\u7136\u540e\u4f7f\u7528\u5168\u8fde\u63a5\u5c42\u6765\u5f97\u5230\u9884\u6d4b\u503c\u3002\u7f51\u7edc\u7ed3\u6784\u53c2\u8003GooLeNet\u6a21\u578b\uff0c\u5305\u542b24\u4e2a\u5377\u79ef\u5c42\u548c2\u4e2a\u5168\u8fde\u63a5\u5c42\uff0c\u5982\u56fe8\u6240\u793a\u3002\u5bf9\u4e8e\u5377\u79ef\u5c42\uff0c\u4e3b\u8981\u4f7f\u75281&#215;1\u5377\u79ef\u6765\u505achannle reduction\uff0c\u7136\u540e\u7d27\u8ddf3&#215;3\u5377\u79ef\u3002\u5bf9\u4e8e\u5377\u79ef\u5c42\u548c\u5168\u8fde\u63a5\u5c42\uff0c\u91c7\u7528Leaky ReLU\u6fc0\u6d3b\u51fd\u6570\uff1amax(x, 0.1x)&nbsp;\u3002\u4f46\u662f\u6700\u540e\u4e00\u5c42\u5374\u91c7\u7528\u7ebf\u6027\u6fc0\u6d3b\u51fd\u6570\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-style-default\"><img loading=\"lazy\" width=\"1024\" height=\"440\" src=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/01\/image-1-1024x440.png\" alt=\"\" class=\"wp-image-1083\" srcset=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/01\/image-1-1024x440.png 1024w, http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/01\/image-1-300x129.png 300w, http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/01\/image-1-768x330.png 768w, http:\/\/139.9.1.231\/wp-content\/uploads\/2022\/01\/image-1.png 1481w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u635f\u5931\u51fd\u6570\u8ba1\u7b97\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p>\u5176\u4e2d\u7b2c\u4e00\u9879\u662f\u8fb9\u754c\u6846\u4e2d\u5fc3\u5750\u6807\u7684\u8bef\u5dee\u9879\uff0c \\(1_{i j}^{obj}\\) \u6307\u7684\u662f\u7b2c \\(i\\) \u4e2a\u5355\u5143\u683c\u5b58\u5728\u76ee\u6807\uff0c\u4e14\u8be5\u5355\u5143\u683c\u4e2d\u7684\u7b2c \\(j\\) \u4e2a\u8fb9\u754c\u6846\u8d1f\u8d23\u9884\u6d4b\u8be5\u76ee\u6807\u3002\u7b2c\u4e8c\u9879\u662f\u8fb9\u754c\u6846\u7684\u9ad8\u4e0e\u5bbd\u7684\u8bef\u5dee\u9879\u3002\u7b2c\u4e09\u9879\u662f\u5305\u542b\u76ee\u6807\u7684\u8fb9\u754c\u6846 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class=\"screen-reader-text\">YOLO\u7cfb\u5217\uff08\u4e8c\uff09\uff1ayolov1<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[4,12,9],"tags":[],"_links":{"self":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/991"}],"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=991"}],"version-history":[{"count":25,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/991\/revisions"}],"predecessor-version":[{"id":6751,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/991\/revisions\/6751"}],"wp:attachment":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/media?parent=991"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/categories?post=991"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/tags?post=991"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}