{"id":200412,"date":"2024-05-10T01:46:44","date_gmt":"2024-05-09T17:46:44","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/200412.html"},"modified":"2024-05-10T01:46:48","modified_gmt":"2024-05-09T17:46:48","slug":"opencv%e7%9a%84contourarea%e5%87%bd%e6%95%b0%e7%ae%97%e6%b3%95%e5%8e%9f%e7%90%86%e6%98%af%e4%bb%80%e4%b9%88","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/200412.html","title":{"rendered":"OpenCV\u7684contourArea\u51fd\u6570\u7b97\u6cd5\u539f\u7406\u662f\u4ec0\u4e48"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/24141154\/6eebf9c4-3f09-4e80-be22-0bcdd5ed0979.webp\" alt=\"OpenCV\u7684contourArea\u51fd\u6570\u7b97\u6cd5\u539f\u7406\u662f\u4ec0\u4e48\" \/><\/p>\n<p><p>OpenCV \u7684 contourArea \u51fd\u6570\u7528\u4e8e\u8ba1\u7b97\u8f6e\u5ed3\u7684\u9762\u79ef\uff0c\u5b83\u4e3b\u8981\u57fa\u4e8e\u683c\u6797\u516c\u5f0f\uff08Green&#039;s theorem\uff09\u6765\u5b9e\u73b0\u6570\u5b66\u4e0a\u5bf9\u4e8e\u5e73\u9762\u95ed\u5408\u66f2\u7ebf\u6240\u56f4\u6210\u533a\u57df\u7684\u9762\u79ef\u8ba1\u7b97\u3002\u683c\u6797\u516c\u5f0f\u5c06\u4e8c\u7ef4\u5e73\u9762\u533a\u57df\u5185\u7684\u590d\u6742\u79ef\u5206\u8f6c\u5316\u4e3a\u66f2\u7ebf\u8f6e\u5ed3\u4e0a\u7684\u7b80\u5355\u79ef\u5206\uff0c\u4ece\u800c\u9ad8\u6548\u8ba1\u7b97\u5c01\u95ed\u533a\u57df\u7684\u9762\u79ef\u3002\u5177\u4f53\u5230 contourArea \u51fd\u6570\uff0c\u5b83\u91c7\u7528\u7684\u662f\u683c\u6797\u5b9a\u7406\u7684\u79bb\u6563\u5f62\u5f0f\uff0c\u901a\u8fc7\u6570\u5b66\u4e0a\u7684\u6c42\u548c\u5f62\u5f0f\u6765\u8fd1\u4f3c\u8fde\u7eed\u79ef\u5206\uff0c\u6bcf\u5bf9\u76f8\u90bb\u70b9\u7684\u8d21\u732e\u901a\u8fc7\u7279\u5b9a\u7684\u516c\u5f0f\u8ba1\u7b97\u51fa\u6765\u5e76\u7d2f\u52a0\uff0c\u6700\u7ec8\u5f97\u5230\u5c01\u95ed\u8f6e\u5ed3\u7684\u603b\u9762\u79ef\u3002<\/p>\n<\/p>\n<p><p>\u5728\u8be6\u7ec6\u63cf\u8ff0\u4e2d\uff0ccontourArea \u51fd\u6570\u7684\u7b97\u6cd5\u7ec6\u8282\u6d89\u53ca\u5230\u201c\u6709\u5411\u8fb9\u201d\u3002\u6bcf\u4e00\u6761\u8fb9\u63d0\u4f9b\u4e00\u4e2a\u6709\u5411\u9762\u79ef\u7684\u8d21\u732e\uff0c\u8fb9\u7684\u65b9\u5411\uff08\u987a\u65f6\u9488\u6216\u9006\u65f6\u9488\uff09\u5c06\u5f71\u54cd\u9762\u79ef\u7684\u6b63\u8d1f\u7b26\u53f7\u3002\u904d\u5386\u8f6e\u5ed3\u4e0a\u7684\u70b9\uff0c\u5bf9\u4e8e\u6bcf\u4e00\u5bf9\u76f8\u90bb\u70b9 <code>(x[i], y[i])<\/code> \u548c <code>(x[i+1], y[i+1])<\/code>\uff0c\u5176\u5bf9\u5e94\u7684\u6709\u5411\u9762\u79ef\u8d21\u732e\u4e3a <code>(x[i]*y[i+1] - x[i+1]*y[i]) \/ 2<\/code>\u3002\u6574\u4e2a\u8f6e\u5ed3\u7684\u9762\u79ef\u5219\u662f\u6240\u6709\u8fd9\u4e9b\u5c0f\u4e09\u89d2\u5f62\u6709\u5411\u9762\u79ef\u8d21\u732e\u7684\u603b\u548c\u3002\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u5982\u679c\u8f6e\u5ed3\u662f\u987a\u65f6\u9488\u7684\uff0c\u7ed3\u679c\u4e3a\u6b63\u503c\uff1b\u5982\u679c\u662f\u9006\u65f6\u9488\u7684\uff0c\u7ed3\u679c\u4e3a\u8d1f\u503c\u3002\u6700\u7ec8 contourArea \u51fd\u6570\u8fd4\u56de\u9762\u79ef\u7684\u7edd\u5bf9\u503c\uff0c\u4fdd\u8bc1\u5f97\u5230\u7684\u662f\u5b9e\u9645\u7684\u9762\u79ef\u5927\u5c0f\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u683c\u6797\u516c\u5f0f\u53ca\u5176\u5e94\u7528<\/h3>\n<\/p>\n<p><p>\u683c\u6797\u516c\u5f0f\uff08Green&#039;s theorem\uff09\u5728\u6570\u5b66\u4e0a\u662f\u4e00\u4e2a\u5f3a\u6709\u529b\u7684\u5de5\u5177\uff0c\u5b83\u5c06\u590d\u6742\u7684\u5e73\u9762\u533a\u57df\u79ef\u5206\u95ee\u9898\u8f6c\u5316\u4e3a\u8fb9\u754c\u79ef\u5206\u95ee\u9898\u3002\u5728\u8ba1\u7b97\u673a\u89c6\u89c9\u548c\u56fe\u50cf\u5904\u7406\u4e2d\uff0c\u683c\u6797\u516c\u5f0f\u5728\u8ba1\u7b97\u56fe\u50cf\u7279\u5f81\u65f6\u5c24\u4e3a\u91cd\u8981\u3002\u5728 <code>contourArea<\/code> \u51fd\u6570\u4e2d\uff0c\u6b64\u516c\u5f0f\u88ab\u5e94\u7528\u6765\u9ad8\u6548\u51c6\u786e\u5730\u8ba1\u7b97\u5c01\u95ed\u8f6e\u5ed3\u7684\u9762\u79ef\u3002<\/p>\n<\/p>\n<p><h3>\u4e8c\u3001\u79bb\u6563\u5f62\u5f0f\u7684\u683c\u6797\u516c\u5f0f\u5b9e\u73b0<\/h3>\n<\/p>\n<p><p><code>contourArea<\/code> \u51fd\u6570\u4f7f\u7528\u7684\u662f\u683c\u6797\u516c\u5f0f\u7684\u79bb\u6563\u5f62\u5f0f\uff0c\u5b83\u9002\u7528\u4e8e\u57fa\u4e8e\u50cf\u7d20\u70b9\u7684\u56fe\u50cf\u5904\u7406\u3002\u7531\u4e8e\u56fe\u50cf\u4e2d\u7684\u8f6e\u5ed3\u662f\u7531\u6709\u9650\u4e2a\u70b9\u6784\u6210\u7684\uff0c\u56e0\u6b64\u516c\u5f0f\u5efa\u7acb\u5728\u8fd9\u4e9b\u79bb\u6563\u70b9\u4e0a\u3002\u7b97\u6cd5\u901a\u8fc7\u8003\u8651\u6bcf\u4e00\u5bf9\u76f8\u90bb\u70b9\u7684\u6709\u5411\u9762\u79ef\u8d21\u732e\uff0c\u8fdb\u884c\u6570\u5b66\u4e0a\u7684\u6c42\u548c\u8fd0\u7b97\uff0c\u6765\u5f97\u5230\u6574\u4e2a\u8f6e\u5ed3\u7684\u9762\u79ef\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001\u6709\u5411\u9762\u79ef\u8ba1\u7b97\u65b9\u6cd5<\/h3>\n<\/p>\n<p><p>\u6709\u5411\u9762\u79ef\u662f\u8ba1\u7b97\u8fc7\u7a0b\u4e2d\u7684\u4e00\u4e2a\u5173\u952e\u6b65\u9aa4\uff0c\u5b83\u901a\u8fc7\u786e\u5b9a\u70b9\u7684\u987a\u5e8f\uff08\u987a\u65f6\u9488\u8fd8\u662f\u9006\u65f6\u9488\uff09\u6765\u8ba1\u7b97\u6bcf\u4e2a\u5c0f\u4e09\u89d2\u5f62\u8d21\u732e\u7684\u9762\u79ef\u3002<strong>\u8f6e\u5ed3\u4e0a\u4e24\u4e2a\u76f8\u90bb\u70b9\u4e0e\u539f\u70b9\u6784\u6210\u7684\u4e09\u89d2\u5f62\u9762\u79ef\u53ef\u4ee5\u89c6\u4e3a\u5411\u91cf\u53c9\u4e58\u7684\u7ed3\u679c\uff0c\u4ece\u800c\u786e\u5b9a\u8fd9\u4e2a\u5c0f\u4e09\u89d2\u5f62\u6709\u591a\u5927\u7684\u9762\u79ef\u8d21\u732e\u7ed9\u6574\u4e2a\u8f6e\u5ed3\u3002<\/strong><\/p>\n<\/p>\n<p><h3>\u56db\u3001\u9762\u79ef\u8ba1\u7b97\u7684\u7b26\u53f7\u95ee\u9898<\/h3>\n<\/p>\n<p><p>\u5728\u8ba1\u7b97\u8fc7\u7a0b\u4e2d\uff0c\u9762\u79ef\u7684\u7b26\u53f7\u662f\u7531\u8f6e\u5ed3\u65b9\u5411\u51b3\u5b9a\u7684\u3002\u5982\u679c\u8f6e\u5ed3\u662f\u4ee5\u987a\u65f6\u9488\u65b9\u5411\u7ed9\u51fa\u7684\uff0c\u6839\u636e\u53f3\u624b\u5b9a\u5219\uff0c\u8ba1\u7b97\u51fa\u7684\u6709\u5411\u9762\u79ef\u5c06\u662f\u6b63\u503c\uff1b\u5982\u679c\u662f\u9006\u65f6\u9488\u65b9\u5411\u7ed9\u51fa\u7684\uff0c\u90a3\u4e48\u6709\u5411\u9762\u79ef\u5c06\u662f\u8d1f\u503c\u3002\u6700\u7ec8\uff0c\u7b97\u6cd5\u8fd4\u56de\u9762\u79ef\u7684\u7edd\u5bf9\u503c\uff0c\u786e\u4fdd\u5f97\u5230\u7684\u662f\u6b63\u786e\u7684\u9762\u79ef\u5927\u5c0f\uff0c\u800c\u4e0d\u662f\u5e26\u6709\u4efb\u4f55\u65b9\u5411\u6027\u7684\u6570\u503c\u3002<\/p>\n<\/p>\n<p><h3>\u4e94\u3001\u7b97\u6cd5\u5b9e\u73b0\u5c0f\u6280\u5de7<\/h3>\n<\/p>\n<p><p>\u5728\u5b9e\u73b0 <code>contourArea<\/code> \u7b97\u6cd5\u7684\u65f6\u5019\uff0c\u6709\u4e00\u7cfb\u5217\u5c0f\u6280\u5de7\u53ef\u4ee5\u4f18\u5316\u8ba1\u7b97\u8fc7\u7a0b\uff0c\u5982\u9884\u5904\u7406\u8f6e\u5ed3\u70b9\u4ee5\u5220\u9664\u91cd\u590d\u70b9\u3001\u5904\u7406\u975e\u7b80\u5355\u8f6e\u5ed3\u7b49\u3002\u8fd9\u4e9b\u6280\u5de7\u6709\u52a9\u4e8e\u63d0\u9ad8\u7b97\u6cd5\u7684\u9c81\u68d2\u6027\u548c\u7cbe\u51c6\u5ea6\uff0c\u7279\u522b\u662f\u5f53\u5904\u7406\u5b9e\u9645\u56fe\u50cf\u4e2d\u7684\u590d\u6742\u8f6e\u5ed3\u65f6\u3002<\/p>\n<\/p>\n<p><h3>\u516d\u3001\u793a\u4f8b\u548c\u5e94\u7528<\/h3>\n<\/p>\n<p><p><code>contourArea<\/code> \u51fd\u6570\u5728\u5b9e\u9645\u7684\u5e94\u7528\u4e2d\u975e\u5e38\u5e7f\u6cdb\uff0c\u4ece\u7b80\u5355\u7684\u5f62\u72b6\u68c0\u6d4b\u5230\u590d\u6742\u7684\u56fe\u50cf\u5206\u6790\uff0c\u8be5\u51fd\u6570\u90fd\u88ab\u5e7f\u6cdb\u7528\u4e8e\u5404\u79cd\u573a\u666f\u3002\u4f8b\u5982\uff0c\u5728\u5de5\u4e1a\u4e0a\u53ef\u7528\u4e8e\u7f3a\u9677\u68c0\u6d4b\uff0c\u5728\u751f\u7269\u533b\u5b66\u56fe\u50cf\u5904\u7406\u4e2d\u53ef\u5e2e\u52a9\u6d4b\u91cf\u7ec6\u80de\u7684\u5927\u5c0f\u7b49\u7b49\u3002\u901a\u8fc7\u5177\u4f53\u793a\u4f8b\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230 <code>contourArea<\/code> \u5982\u4f55\u5728\u4e0d\u540c\u7684\u73af\u5883\u4e2d\u53d1\u6325\u4f5c\u7528\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>\u4ec0\u4e48\u662fOpenCV\u4e2d\u7684contourArea\u51fd\u6570\uff1f<\/strong><\/p>\n<p>contourArea\u51fd\u6570\u662fOpenCV\u5e93\u4e2d\u7684\u4e00\u4e2a\u51fd\u6570\uff0c\u7528\u4e8e\u8ba1\u7b97\u7ed9\u5b9a\u8f6e\u5ed3\u7684\u9762\u79ef\u3002<\/p>\n<p><strong>contourArea\u51fd\u6570\u7684\u7b97\u6cd5\u539f\u7406\u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n<p>contourArea\u51fd\u6570\u7684\u7b97\u6cd5\u539f\u7406\u57fa\u4e8e\u683c\u6797\u516c\u5f0f\uff0c\u4e5f\u53eb\u591a\u8fb9\u5f62\u9762\u79ef\u516c\u5f0f\u3002\u8be5\u516c\u5f0f\u662f\u901a\u8fc7\u5c06\u8f6e\u5ed3\u5206\u5272\u6210\u591a\u4e2a\u4e09\u89d2\u5f62\u6765\u8ba1\u7b97\u8f6e\u5ed3\u7684\u9762\u79ef\u3002\u5177\u4f53\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li>\u904d\u5386\u8f6e\u5ed3\u4e2d\u7684\u6bcf\u4e2a\u70b9\uff0c\u5c06\u5b83\u548c\u4e0b\u4e00\u4e2a\u70b9\u8fde\u63a5\u8d77\u6765\u5f62\u6210\u4e00\u4e2a\u4e09\u89d2\u5f62\u3002<\/li>\n<li>\u8ba1\u7b97\u6bcf\u4e2a\u4e09\u89d2\u5f62\u7684\u9762\u79ef\u3002<\/li>\n<li>\u5c06\u6bcf\u4e2a\u4e09\u89d2\u5f62\u7684\u9762\u79ef\u76f8\u52a0\uff0c\u5f97\u5230\u6574\u4e2a\u8f6e\u5ed3\u7684\u9762\u79ef\u3002<\/li>\n<\/ol>\n<p><strong>\u5982\u4f55\u4f7f\u7528contourArea\u51fd\u6570\u8ba1\u7b97\u8f6e\u5ed3\u7684\u9762\u79ef\uff1f<\/strong><\/p>\n<p>\u4f7f\u7528contourArea\u51fd\u6570\u8ba1\u7b97\u8f6e\u5ed3\u7684\u9762\u79ef\u975e\u5e38\u7b80\u5355\u3002\u53ea\u9700\u5c06\u8981\u8ba1\u7b97\u9762\u79ef\u7684\u8f6e\u5ed3\u4f5c\u4e3a\u51fd\u6570\u7684\u8f93\u5165\u53c2\u6570\u5373\u53ef\u3002\u4f8b\u5982\uff0c\u4e0b\u9762\u662f\u4e00\u4e2a\u4f7f\u7528contourArea\u51fd\u6570\u8ba1\u7b97\u8f6e\u5ed3\u9762\u79ef\u7684\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n<pre><code class=\"language-cpp\">#include &lt;opencv2\/opencv.hpp&gt;\n\nusing namespace cv;\n\nint m<a href=\"https:\/\/docs.pingcode.com\/blog\/59162.html\" target=\"_blank\">AI<\/a>n()\n{\n    \/\/ \u8bfb\u53d6\u56fe\u50cf\u5e76\u8fdb\u884c\u56fe\u50cf\u5904\u7406\n\n    \/\/ \u63d0\u53d6\u8f6e\u5ed3\n\n    \/\/ \u8ba1\u7b97\u9762\u79ef\n    double area = contourArea(contour);\n\n    \/\/ \u663e\u793a\u7ed3\u679c\n    std::cout &lt;&lt; &quot;\u8f6e\u5ed3\u7684\u9762\u79ef\u4e3a\uff1a&quot; &lt;&lt; area &lt;&lt; std::endl;\n\n    return 0;\n}\n<\/code><\/pre>\n<p>\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7contourArea\u51fd\u6570\u8ba1\u7b97\u4e86\u53d8\u91cfcontour\u6240\u4ee3\u8868\u7684\u8f6e\u5ed3\u7684\u9762\u79ef\uff0c\u5e76\u5c06\u7ed3\u679c\u663e\u793a\u5728\u5c4f\u5e55\u4e0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"OpenCV \u7684 contourArea \u51fd\u6570\u7528\u4e8e\u8ba1\u7b97\u8f6e\u5ed3\u7684\u9762\u79ef\uff0c\u5b83\u4e3b\u8981\u57fa\u4e8e\u683c\u6797\u516c\u5f0f\uff08Green&#039;s [&hellip;]","protected":false},"author":3,"featured_media":200416,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/200412"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=200412"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/200412\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/200416"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=200412"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=200412"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=200412"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}