\u5173\u95ed\u7a97\u53e3<\/strong><\/h2>\ncv2.destroyAllWindows()<\/p>\n
<\/code><\/pre>\n<\/p>\n
5.2 \u56fe\u50cf\u5904\u7406\u793a\u4f8b<\/h4>\n<\/p>\n
\u4f7f\u7528OpenCV\u53ef\u4ee5\u8fdb\u884c\u5404\u79cd\u56fe\u50cf\u5904\u7406\u64cd\u4f5c\uff0c\u6bd4\u5982\u7070\u5ea6\u8f6c\u6362\u3001\u8fb9\u7f18\u68c0\u6d4b\u7b49\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u7070\u5ea6\u8f6c\u6362\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
import cv2<\/p>\n\u8bfb\u53d6\u56fe\u50cf<\/strong><\/h2>\nimage = cv2.imread('path_to_image.jpg')<\/p>\n
\u8f6c\u6362\u4e3a\u7070\u5ea6\u56fe\u50cf<\/strong><\/h2>\ngray_image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)<\/p>\n
\u663e\u793a\u7070\u5ea6\u56fe\u50cf<\/strong><\/h2>\ncv2.imshow('Gray Image', gray_image)<\/p>\n
\u7b49\u5f85\u6309\u952e<\/strong><\/h2>\ncv2.waitKey(0)<\/p>\n
\u5173\u95ed\u7a97\u53e3<\/strong><\/h2>\ncv2.destroyAllWindows()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u516d\u3001OpenCV\u7684\u9ad8\u7ea7\u529f\u80fd<\/h3>\n<\/p>\n
6.1 \u89c6\u9891\u5904\u7406<\/h4>\n<\/p>\n
OpenCV\u4e0d\u4ec5\u53ef\u4ee5\u5904\u7406\u9759\u6001\u56fe\u50cf\uff0c\u8fd8\u53ef\u4ee5\u5904\u7406\u89c6\u9891\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u89c6\u9891\u6355\u83b7\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
import cv2<\/p>\n\u6253\u5f00\u6444\u50cf\u5934<\/strong><\/h2>\ncap = cv2.VideoCapture(0)<\/p>\n
while True:<\/p>\n
# \u8bfb\u53d6\u6bcf\u4e00\u5e27<\/p>\n
ret, frame = cap.read()<\/p>\n
if not ret:<\/p>\n
break<\/p>\n
# \u663e\u793a\u5e27<\/p>\n
cv2.imshow('Video', frame)<\/p>\n
# \u6309\u4e0b'q'\u952e\u9000\u51fa<\/p>\n
if cv2.waitKey(1) & 0xFF == ord('q'):<\/p>\n
break<\/p>\n
\u91ca\u653e\u6444\u50cf\u5934\u548c\u5173\u95ed\u7a97\u53e3<\/strong><\/h2>\ncap.release()<\/p>\n
cv2.destroyAllWindows()<\/p>\n
<\/code><\/pre>\n<\/p>\n
6.2 \u673a\u5668\u5b66\u4e60<\/h4>\n<\/p>\n
OpenCV\u8fd8\u63d0\u4f9b\u4e86\u4e00\u4e9b\u673a\u5668\u5b66\u4e60\u7b97\u6cd5\uff0c\u53ef\u4ee5\u7528\u4e8e\u56fe\u50cf\u5206\u7c7b\u3001\u5bf9\u8c61\u68c0\u6d4b\u7b49\u4efb\u52a1\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u5bf9\u8c61\u68c0\u6d4b\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
import cv2<\/p>\n\u52a0\u8f7d\u9884\u8bad\u7ec3\u7684\u5bf9\u8c61\u68c0\u6d4b\u6a21\u578b<\/strong><\/h2>\nnet = cv2.dnn.readNetFromCaffe('path_to_prototxt', 'path_to_caffemodel')<\/p>\n
\u8bfb\u53d6\u56fe\u50cf<\/strong><\/h2>\nimage = cv2.imread('path_to_image.jpg')<\/p>\n
\u83b7\u53d6\u56fe\u50cf\u5c3a\u5bf8<\/strong><\/h2>\n(h, w) = image.shape[:2]<\/p>\n
\u9884\u5904\u7406\u56fe\u50cf<\/strong><\/h2>\nblob = cv2.dnn.blobFromImage(cv2.resize(image, (300, 300)), 0.007843, (300, 300), 127.5)<\/p>\n
\u8bbe\u7f6e\u8f93\u5165<\/strong><\/h2>\nnet.setInput(blob)<\/p>\n
\u524d\u5411\u4f20\u64ad\uff0c\u83b7\u53d6\u68c0\u6d4b\u7ed3\u679c<\/strong><\/h2>\ndetections = net.forward()<\/p>\n
\u7ed8\u5236\u68c0\u6d4b\u7ed3\u679c<\/strong><\/h2>\nfor i in range(detections.shape[2]):<\/p>\n
confidence = detections[0, 0, i, 2]<\/p>\n
if confidence > 0.2:<\/p>\n
idx = int(detections[0, 0, i, 1])<\/p>\n
box = detections[0, 0, i, 3:7] * np.array([w, h, w, h])<\/p>\n
(startX, startY, endX, endY) = box.astype('int')<\/p>\n
label = f'{idx}: {confidence:.2f}'<\/p>\n
cv2.rectangle(image, (startX, startY), (endX, endY), (0, 255, 0), 2)<\/p>\n
cv2.putText(image, label, (startX, startY - 10), cv2.FONT_HERSHEY_SIMPLEX, 0.5, (0, 255, 0), 2)<\/p>\n
\u663e\u793a\u56fe\u50cf<\/strong><\/h2>\ncv2.imshow('Detection', image)<\/p>\n
cv2.waitKey(0)<\/p>\n
cv2.destroyAllWindows()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e03\u3001\u5e38\u89c1\u95ee\u9898\u53ca\u89e3\u51b3\u65b9\u6848<\/h3>\n<\/p>\n
7.1 \u5b89\u88c5\u5931\u8d25<\/h4>\n<\/p>\n
\u5982\u679c\u5728\u5b89\u88c5OpenCV\u65f6\u9047\u5230\u95ee\u9898\uff0c\u53ef\u4ee5\u5c1d\u8bd5\u4ee5\u4e0b\u89e3\u51b3\u65b9\u6848\uff1a<\/p>\n<\/p>\n
\n- \n
\u786e\u4fddpip\u7248\u672c\u662f\u6700\u65b0\u7684\uff1a<\/p>\n<\/p>\n
pip install --upgrade pip<\/p>\n<\/code><\/pre>\n<\/p>\n<\/li>\n
- \n
\u4f7f\u7528\u56fd\u5185\u955c\u50cf\u6e90\uff1a<\/p>\n<\/p>\n
pip install opencv-python -i https:\/\/pypi.tuna.tsinghua.edu.cn\/simple<\/p>\n<\/code><\/pre>\n<\/p>\n<\/li>\n<\/ol>\n
7.2 ImportError: No module named 'cv2'<\/h4>\n<\/p>\n
\u5982\u679c\u5728\u5bfc\u5165cv2\u6a21\u5757\u65f6\u9047\u5230ImportError\uff0c\u53ef\u80fd\u662f\u56e0\u4e3aOpenCV\u5b89\u88c5\u8def\u5f84\u672a\u88ab\u6b63\u786e\u6dfb\u52a0\u5230Python\u8def\u5f84\u4e2d\u3002\u53ef\u4ee5\u5c1d\u8bd5\u91cd\u65b0\u5b89\u88c5OpenCV\uff0c\u6216\u8005\u624b\u52a8\u6dfb\u52a0\u5b89\u88c5\u8def\u5f84\u3002<\/p>\n<\/p>\n
\u516b\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
\u901a\u8fc7\u4ee5\u4e0a\u6b65\u9aa4\uff0c\u6211\u4eec\u8be6\u7ec6\u4ecb\u7ecd\u4e86\u5982\u4f55\u5728Python3\u4e2d\u5b89\u88c5\u548c\u4f7f\u7528OpenCV\uff0c\u5305\u62ec\u57fa\u7840\u5b89\u88c5\u3001\u9a8c\u8bc1\u3001\u57fa\u672c\u4f7f\u7528\u548c\u9ad8\u7ea7\u529f\u80fd\u7b49\u3002\u5e0c\u671b\u8fd9\u4e9b\u5185\u5bb9\u80fd\u591f\u5e2e\u52a9\u4f60\u987a\u5229\u5728Python3\u4e2d\u6dfb\u52a0\u5e76\u4f7f\u7528OpenCV\u8fdb\u884c\u56fe\u50cf\u5904\u7406\u548c\u8ba1\u7b97\u673a\u89c6\u89c9\u76f8\u5173\u7684\u5f00\u53d1\u3002\u5982\u679c\u5728\u5b9e\u9645\u64cd\u4f5c\u4e2d\u9047\u5230\u95ee\u9898\uff0c\u53ef\u4ee5\u53c2\u8003\u5b98\u65b9\u6587\u6863\u6216\u793e\u533a\u8d44\u6e90\u5bfb\u6c42\u5e2e\u52a9\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n \u5982\u4f55\u5728Python3\u4e2d\u5b89\u88c5OpenCV\u5e93\uff1f<\/strong>
\u8981\u5728Python3\u4e2d\u5b89\u88c5OpenCV\u5e93\uff0c\u53ef\u4ee5\u4f7f\u7528Python\u7684\u5305\u7ba1\u7406\u5de5\u5177pip\u3002\u6253\u5f00\u547d\u4ee4\u884c\u7a97\u53e3\uff0c\u8f93\u5165\u4ee5\u4e0b\u547d\u4ee4\uff1a <\/p>\npip install opencv-python\n<\/code><\/pre>\n\u5982\u679c\u9700\u8981\u5b89\u88c5\u5305\u542b\u989d\u5916\u529f\u80fd\u7684\u7248\u672c\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\uff1a <\/p>\n
pip install opencv-contrib-python\n<\/code><\/pre>\n\u786e\u4fdd\u5728\u5b89\u88c5\u4e4b\u524d\u5df2\u7ecf\u6b63\u786e\u5b89\u88c5\u4e86Python\u548cpip\uff0c\u5e76\u4e14\u53ef\u4ee5\u901a\u8fc7\u547d\u4ee4\u884c\u8bbf\u95ee\u3002<\/p>\n
\u5728\u5b89\u88c5OpenCV\u540e\uff0c\u5982\u4f55\u9a8c\u8bc1\u5176\u662f\u5426\u6210\u529f\u5b89\u88c5\uff1f<\/strong>
\u5b89\u88c5\u5b8c\u6210\u540e\uff0c\u53ef\u4ee5\u901a\u8fc7\u6253\u5f00Python\u89e3\u91ca\u5668\u5e76\u8f93\u5165\u4ee5\u4e0b\u4ee3\u7801\u6765\u9a8c\u8bc1OpenCV\u662f\u5426\u6210\u529f\u5b89\u88c5\uff1a <\/p>\nimport cv2\nprint(cv2.__version__)\n<\/code><\/pre>\n\u5982\u679c\u6ca1\u6709\u9519\u8bef\u4fe1\u606f\u5e76\u4e14\u8f93\u51fa\u4e86OpenCV\u7684\u7248\u672c\u53f7\uff0c\u8bf4\u660e\u5b89\u88c5\u6210\u529f\u3002<\/p>\n
OpenCV\u5728Python3\u4e2d\u53ef\u4ee5\u5b9e\u73b0\u54ea\u4e9b\u529f\u80fd\uff1f<\/strong>
OpenCV\u662f\u4e00\u4e2a\u5f3a\u5927\u7684\u8ba1\u7b97\u673a\u89c6\u89c9\u5e93\uff0c\u53ef\u4ee5\u5b9e\u73b0\u591a\u79cd\u529f\u80fd\uff0c\u5305\u62ec\u4f46\u4e0d\u9650\u4e8e\uff1a\u56fe\u50cf\u5904\u7406\u3001\u89c6\u9891\u5206\u6790\u3001\u7269\u4f53\u68c0\u6d4b\u3001\u9762\u90e8\u8bc6\u522b\u3001\u7279\u5f81\u5339\u914d\u3001\u56fe\u50cf\u53d8\u6362\u548c\u673a\u5668\u5b66\u4e60\u7b49\u3002\u901a\u8fc7\u7ed3\u5408NumPy\u7b49\u5176\u4ed6\u5e93\uff0cOpenCV\u80fd\u5728\u6570\u636e\u5904\u7406\u548c\u5206\u6790\u65b9\u9762\u63d0\u4f9b\u66f4\u5927\u7684\u7075\u6d3b\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python3\u4e2d\u6dfb\u52a0OpenCV\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u51e0\u6b65\u5b9e\u73b0\uff1a\u5b89\u88c5Python\u3001\u5b89\u88c5pip\u3001\u4f7f\u7528pip\u5b89\u88c5Open […]","protected":false},"author":3,"featured_media":1028805,"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\/1028792"}],"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=1028792"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1028792\/revisions"}],"predecessor-version":[{"id":1028807,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1028792\/revisions\/1028807"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1028805"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1028792"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1028792"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1028792"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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<\/p>\n