{"id":3128,"date":"2023-06-29T17:52:47","date_gmt":"2023-06-29T09:52:47","guid":{"rendered":"https:\/\/www.yatenglg.cn\/blog\/?p=3128"},"modified":"2023-06-29T17:53:21","modified_gmt":"2023-06-29T09:53:21","slug":"canny%e6%bb%a4%e6%b3%a2","status":"publish","type":"post","link":"https:\/\/www.yatenglg.cn\/blog\/?p=3128","title":{"rendered":"canny\u6ee4\u6ce2"},"content":{"rendered":"\n<pre class=\"wp-block-preformatted\"><strong>cv2.Canny(image, threshold1, threshold2, apertureSize, L2gradient)\n-  image\u4e3a\u8f93\u5165\u56fe\u50cf\u3002\n- threshold1\u8868\u793a\u5904\u7406\u8fc7\u7a0b\u4e2d\u7684\u7b2c\u4e00\u4e2a\u9608\u503c\u3002\n- threshold2\u8868\u793a\u5904\u7406\u8fc7\u7a0b\u4e2d\u7684\u7b2c\u4e8c\u4e2a\u9608\u503c\u3002\n- apertureSize\u8868\u793aSobel\u7b97\u5b50\u7684\u5b54\u5f84\u5927\u5c0f\u3002\n- L2gradient\u662f\u5426\u4f7f\u7528 L2 \u8303\u6570\u8fdb\u884c\u8ba1\u7b97\uff0c\u5426\u5219\u4f7f\u7528 L1 \u8303\u6570<\/strong><\/pre>\n\n\n\n<pre class=\"wp-block-preformatted\">cv2.Canny(image, threshold1=0.2*256, threshold2=0.8*256, apertureSize=3, L2gradient=False)<\/pre>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><a href=\"https:\/\/www.yatenglg.cn\/blog\/wp-content\/uploads\/2023\/06\/cv2_canny_threshold1_0.2x256_threshold2_0.8x256_apertureSize_3_L2gradient_False.jpg\"><img src=\"http:\/\/www.yatenglg.cn\/blog\/wp-content\/uploads\/2023\/06\/cv2_canny_threshold1_0.2x256_threshold2_0.8x256_apertureSize_3_L2gradient_False.jpg\" alt=\"\" class=\"wp-image-3137\" width=\"480\" height=\"384\"\/><\/a><\/figure>\n\n\n\n<pre class=\"wp-block-preformatted\">cv2.Canny(image, threshold1=0.2*256, threshold2=0.8*256, apertureSize=3, L2gradient=True)<\/pre>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><a href=\"https:\/\/www.yatenglg.cn\/blog\/wp-content\/uploads\/2023\/06\/cv2_canny_threshold1_0.2x256_threshold2_0.8x256_apertureSize_3_L2gradient_True.jpg\"><img src=\"https:\/\/www.yatenglg.cn\/blog\/wp-content\/uploads\/2023\/06\/cv2_canny_threshold1_0.2x256_threshold2_0.8x256_apertureSize_3_L2gradient_True.jpg\" alt=\"\" class=\"wp-image-3138\" width=\"480\" height=\"384\"\/><\/a><\/figure>\n\n\n\n<pre class=\"wp-block-preformatted\">cv2.Canny(image, threshold1=0.2*256, threshold2=0.8*256, apertureSize=5, L2gradient=False)<\/pre>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><a href=\"https:\/\/www.yatenglg.cn\/blog\/wp-content\/uploads\/2023\/06\/cv2_canny_threshold1_0.2x256_threshold2_0.8x256_apertureSize_5_L2gradient_False.jpg\"><img src=\"https:\/\/www.yatenglg.cn\/blog\/wp-content\/uploads\/2023\/06\/cv2_canny_threshold1_0.2x256_threshold2_0.8x256_apertureSize_5_L2gradient_False.jpg\" alt=\"\" class=\"wp-image-3141\" width=\"480\" height=\"384\"\/><\/a><\/figure>\n\n\n\n<pre class=\"wp-block-preformatted\">cv2.Canny(image, threshold1=0.5*256, threshold2=0.8*256, apertureSize=3, L2gradient=False)<\/pre>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img src=\"http:\/\/www.yatenglg.cn\/blog\/wp-content\/uploads\/2023\/06\/cv2_canny_threshold1_0.5x256_threshold2_0.8x256_apertureSize_3_L2gradient_False.jpg\" alt=\"\" class=\"wp-image-3142\" width=\"480\" height=\"384\"\/><\/figure>\n\n\n\n<pre class=\"wp-block-preformatted\"><strong>skimage.feature.canny(image, sigma, low_threshold, high_threshold)\n- sigma \u9ad8\u65af\u6ee4\u6ce2\u5668\u7684\u6807\u51c6\u5dee\n- low_threshold \u6ede\u540e\u9608\u503c(\u94fe\u63a5\u8fb9)\u7684\u4e0b\u9650\u3002\u5982\u679c\u6ca1\u6709\uff0clow_threshold \u8bbe\u7f6e\u4e3a dtype \u6700\u5927\u503c\u7684 10%\u3002\n- high_threshold \u6ede\u540e\u9608\u503c\u7684\u4e0a\u9650(\u94fe\u63a5\u8fb9)\u3002\u5982\u679c\u6ca1\u6709\uff0chigh_threshold \u8bbe\u7f6e\u4e3a dtype \u6700\u5927\u503c\u7684 20%\u3002<\/strong><\/pre>\n\n\n\n<pre class=\"wp-block-preformatted\">canny(image, sigma=1.)<\/pre>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img src=\"https:\/\/www.yatenglg.cn\/blog\/wp-content\/uploads\/2023\/06\/skimage_canny_sigma1.jpg\" alt=\"\" class=\"wp-image-3144\" width=\"480\" height=\"384\"\/><\/figure>\n\n\n\n<pre class=\"wp-block-preformatted\">canny(image, sigma=2.)<\/pre>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img src=\"https:\/\/www.yatenglg.cn\/blog\/wp-content\/uploads\/2023\/06\/skimage_canny_sigma2.jpg\" alt=\"\" class=\"wp-image-3145\" width=\"480\" height=\"384\"\/><\/figure>\n\n\n\n<pre class=\"wp-block-preformatted\">canny(image, sigma=1., low_threshold=0.2*256, high_threshold=0.8*256)<\/pre>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img src=\"https:\/\/www.yatenglg.cn\/blog\/wp-content\/uploads\/2023\/06\/skimage_canny_sigma1_lowthreshold_0.2x256_high_threshold_0.8x256-.jpg\" alt=\"\" class=\"wp-image-3146\" width=\"480\" height=\"384\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>cv2.Canny(image, threshold1, threshold2, apertureSize, &#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":[],"categories":[7],"tags":[],"_links":{"self":[{"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/3128"}],"collection":[{"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3128"}],"version-history":[{"count":6,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/3128\/revisions"}],"predecessor-version":[{"id":3148,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/3128\/revisions\/3148"}],"wp:attachment":[{"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3128"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3128"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3128"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}