{"id":3353,"date":"2021-07-23T09:55:07","date_gmt":"2021-07-23T09:55:07","guid":{"rendered":"https:\/\/www.bearloga.space\/?page_id=3353"},"modified":"2021-07-23T09:55:07","modified_gmt":"2021-07-23T09:55:07","slug":"opencv-hough-line-transform","status":"publish","type":"page","link":"https:\/\/www.bearloga.space\/en\/opencv-hough-line-transform\/","title":{"rendered":"OpenCV \u2014 Hough Line Transform"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u0412\u044b \u043c\u043e\u0436\u0435\u0442\u0435 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u0444\u043e\u0440\u043c\u0443 \u0434\u0430\u043d\u043d\u043e\u0433\u043e \u0438\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u044f, \u043f\u0440\u0438\u043c\u0435\u043d\u0438\u0432&nbsp;<strong>\u0442\u0435\u0445\u043d\u0438\u043a\u0443 \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0425\u0430\u0444\u0430,<\/strong>&nbsp;\u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044f \u043c\u0435\u0442\u043e\u0434&nbsp;<strong>HoughLines ()<\/strong>&nbsp;\u043a\u043b\u0430\u0441\u0441\u0430&nbsp;<strong>Imgproc<\/strong>&nbsp;.&nbsp;\u041d\u0438\u0436\u0435 \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442\u0441\u044f \u0441\u0438\u043d\u0442\u0430\u043a\u0441\u0438\u0441 \u044d\u0442\u043e\u0433\u043e \u043c\u0435\u0442\u043e\u0434\u0430.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">HoughLines(image, lines, rho, theta, threshold)\n<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u042d\u0442\u043e\u0442 \u043c\u0435\u0442\u043e\u0434 \u043f\u0440\u0438\u043d\u0438\u043c\u0430\u0435\u0442 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0435 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b \u2014<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>image<\/strong>&nbsp;\u2014 \u041e\u0431\u044a\u0435\u043a\u0442 \u043a\u043b\u0430\u0441\u0441\u0430&nbsp;<strong>Mat,<\/strong>&nbsp;\u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0438\u0439 \u0438\u0441\u0445\u043e\u0434\u043d\u043e\u0435 (\u0432\u0445\u043e\u0434\u043d\u043e\u0435) \u0438\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0435.<\/li><li><strong>lines<\/strong>&nbsp;\u2014 \u043e\u0431\u044a\u0435\u043a\u0442 \u043a\u043b\u0430\u0441\u0441\u0430&nbsp;<strong>Mat, \u0432<\/strong>&nbsp;\u043a\u043e\u0442\u043e\u0440\u043e\u043c \u0445\u0440\u0430\u043d\u0438\u0442\u0441\u044f \u0432\u0435\u043a\u0442\u043e\u0440, \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u0445\u0440\u0430\u043d\u044f\u0442\u0441\u044f \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b (r, \u03a6) \u043b\u0438\u043d\u0438\u0439.<\/li><li><strong>rho<\/strong>&nbsp;\u2014 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f \u0442\u0438\u043f\u0430 double, \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0430\u044f \u0440\u0430\u0437\u0440\u0435\u0448\u0435\u043d\u0438\u0435 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u0430 r \u0432 \u043f\u0438\u043a\u0441\u0435\u043b\u044f\u0445.<\/li><li><strong>theta<\/strong>&nbsp;\u2014 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f \u0442\u0438\u043f\u0430 double, \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0430\u044f \u0440\u0430\u0437\u0440\u0435\u0448\u0435\u043d\u0438\u0435 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u0430 \u03a6 \u0432 \u0440\u0430\u0434\u0438\u0430\u043d\u0430\u0445.<\/li><li><strong>\u041f\u043e\u0440\u043e\u0433<\/strong>&nbsp;\u2014 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f \u0442\u0438\u043f\u0430 integer, \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0430\u044f \u043c\u0438\u043d\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0435 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u043f\u0435\u0440\u0435\u0441\u0435\u0447\u0435\u043d\u0438\u0439 \u0434\u043b\u044f \u00ab\u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0435\u043d\u0438\u044f\u00bb \u043b\u0438\u043d\u0438\u0438.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>image<\/strong>&nbsp;\u2014 \u041e\u0431\u044a\u0435\u043a\u0442 \u043a\u043b\u0430\u0441\u0441\u0430&nbsp;<strong>Mat,<\/strong>&nbsp;\u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0438\u0439 \u0438\u0441\u0445\u043e\u0434\u043d\u043e\u0435 (\u0432\u0445\u043e\u0434\u043d\u043e\u0435) \u0438\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0435.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>lines<\/strong>&nbsp;\u2014 \u043e\u0431\u044a\u0435\u043a\u0442 \u043a\u043b\u0430\u0441\u0441\u0430&nbsp;<strong>Mat, \u0432<\/strong>&nbsp;\u043a\u043e\u0442\u043e\u0440\u043e\u043c \u0445\u0440\u0430\u043d\u0438\u0442\u0441\u044f \u0432\u0435\u043a\u0442\u043e\u0440, \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u0445\u0440\u0430\u043d\u044f\u0442\u0441\u044f \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b (r, \u03a6) \u043b\u0438\u043d\u0438\u0439.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>rho<\/strong>\u00a0\u2014 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f \u0442\u0438\u043f\u0430 double, \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0430\u044f \u0440\u0430\u0437\u0440\u0435\u0448\u0435\u043d\u0438\u0435 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u0430 r \u0432 \u043f\u0438\u043a\u0441\u0435\u043b\u044f\u0445.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>theta<\/strong>&nbsp;\u2014 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f \u0442\u0438\u043f\u0430 double, \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0430\u044f \u0440\u0430\u0437\u0440\u0435\u0448\u0435\u043d\u0438\u0435 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u0430 \u03a6 \u0432 \u0440\u0430\u0434\u0438\u0430\u043d\u0430\u0445.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u041f\u043e\u0440\u043e\u0433<\/strong>&nbsp;\u2014 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f \u0442\u0438\u043f\u0430 integer, \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0430\u044f \u043c\u0438\u043d\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0435 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u043f\u0435\u0440\u0435\u0441\u0435\u0447\u0435\u043d\u0438\u0439 \u0434\u043b\u044f \u00ab\u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0435\u043d\u0438\u044f\u00bb \u043b\u0438\u043d\u0438\u0438.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u043f\u0440\u0438\u043c\u0435\u0440<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0421\u043b\u0435\u0434\u0443\u044e\u0449\u0430\u044f \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0430 \u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0438\u0440\u0443\u0435\u0442, \u043a\u0430\u043a \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0438\u0442\u044c \u043b\u0438\u043d\u0438\u0438 \u0425\u0430\u0444\u0430 \u043d\u0430 \u0437\u0430\u0434\u0430\u043d\u043d\u043e\u043c \u0438\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0438.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">import org.opencv.core.Core;\nimport org.opencv.core.Mat;\nimport org.opencv.core.Point;\nimport org.opencv.core.Scalar;\n\nimport org.opencv.imgcodecs.Imgcodecs;\nimport org.opencv.imgproc.Imgproc;\n\npublic class HoughlinesTest {\n   public static void main(String args[]) throws Exception {\n      \/\/ Loading the OpenCV core library\n      System.loadLibrary( Core.NATIVE_LIBRARY_NAME );\n\n      \/\/ Reading the Image from the file and storing it in to a Matrix object\n      String file = \"E:\/OpenCV\/chap21\/hough_input.jpg\";\n\n      \/\/ Reading the image\n      Mat src = Imgcodecs.imread(file,0);\n\n      \/\/ Detecting edges of it\n      Mat canny = new Mat();\n      Imgproc.Canny(src, canny, 50, 200, 3, false);\n\n      \/\/ Changing the color of the canny\n      Mat cannyColor = new Mat();\n      Imgproc.cvtColor(canny, cannyColor, Imgproc.COLOR_GRAY2BGR);\n\n      \/\/ Detecting the hough lines from (canny)\n      Mat lines = new Mat();\n      Imgproc.HoughLines(canny, lines, 1, Math.PI\/180, 100);\n\n      System.out.println(lines.rows());\n      System.out.println(lines.cols());\n\n      \/\/ Drawing lines on the image\n      double[] data;\n      double rho, theta;\n      Point pt1 = new Point();\n      Point pt2 = new Point();\n      double a, b;\n      double x0, y0;\n      \n      for (int i = 0; i &lt; lines.cols(); i++) {\n         data = lines.get(0, i);\n         rho = data[0];\n         theta = data[1];\n         \n         a = Math.cos(theta);\n         b = Math.sin(theta);\n         x0 = a*rho;\n         y0 = b*rho;\n         \n         pt1.x = Math.round(x0 + 1000*(-b));\n         pt1.y = Math.round(y0 + 1000*(a));\n         pt2.x = Math.round(x0 - 1000*(-b));\n         pt2.y = Math.round(y0 - 1000 *(a));\n         Imgproc.line(cannyColor, pt1, pt2, new Scalar(0, 0, 255), 6);\n      }\n      \/\/ Writing the image\n      Imgcodecs.imwrite(\"E:\/OpenCV\/chap21\/hough_output.jpg\", cannyColor);\n          \n      System.out.println(\"Image Processed\");\n   }\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u041f\u0440\u0435\u0434\u043f\u043e\u043b\u043e\u0436\u0438\u043c, \u0447\u0442\u043e \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u043c \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432\u0445\u043e\u0434\u043d\u043e\u0435 \u0438\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0435&nbsp;<strong>hough_input.jpg,<\/strong>&nbsp;\u0443\u043a\u0430\u0437\u0430\u043d\u043d\u043e\u0435 \u0432 \u0432\u044b\u0448\u0435\u0443\u043a\u0430\u0437\u0430\u043d\u043d\u043e\u0439 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0435.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/coderlessons.com\/wp-content\/uploads\/2019\/07\/hough_input.jpg\" alt=\"Hough \u0412\u0445\u043e\u0434\"\/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u0412\u044b\u0445\u043e\u0434<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u041f\u0440\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0438 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u044b \u0432\u044b \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u0435 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0439 \u0432\u044b\u0432\u043e\u0434:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">143 \n1 \nImage Processed<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u0412\u044b \u043c\u043e\u0436\u0435\u0442\u0435 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u0444\u043e\u0440\u043c\u0443 \u0434\u0430\u043d\u043d\u043e\u0433\u043e \u0438\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u044f, \u043f\u0440\u0438\u043c\u0435\u043d\u0438\u0432&nbsp;\u0442\u0435\u0445\u043d\u0438\u043a\u0443 \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0425\u0430\u0444\u0430,&nbsp;\u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044f \u043c\u0435\u0442\u043e\u0434&nbsp;HoughLines ()&nbsp;\u043a\u043b\u0430\u0441\u0441\u0430&nbsp;Imgproc&nbsp;.&nbsp;\u041d\u0438\u0436\u0435 \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442\u0441\u044f \u0441\u0438\u043d\u0442\u0430\u043a\u0441\u0438\u0441 \u044d\u0442\u043e\u0433\u043e \u043c\u0435\u0442\u043e\u0434\u0430. HoughLines(image, lines, rho, theta, threshold) [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"categories":[108],"tags":[],"class_list":["post-3353","page","type-page","status-publish","hentry","category-opencv"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.bearloga.space\/en\/wp-json\/wp\/v2\/pages\/3353","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bearloga.space\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.bearloga.space\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.bearloga.space\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bearloga.space\/en\/wp-json\/wp\/v2\/comments?post=3353"}],"version-history":[{"count":0,"href":"https:\/\/www.bearloga.space\/en\/wp-json\/wp\/v2\/pages\/3353\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.bearloga.space\/en\/wp-json\/wp\/v2\/media?parent=3353"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bearloga.space\/en\/wp-json\/wp\/v2\/categories?post=3353"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bearloga.space\/en\/wp-json\/wp\/v2\/tags?post=3353"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}