hierarchy Optional information about hierarchy. It is only needed if you want to draw only some of the contours (see maxLevel ). maxLevel Maximal level for drawn contours. If it is 0, only the specified contour is drawn. If it is 1, the function draws the contour(s) and all the nest...
Mat img = image.clone(); //灰度图 vector<vector<cv::Point>> contours; findContours(img, contours, RETR_EXTERNAL, CHAIN_APPROX_NONE); Mat image_drawfindcontours = Mat::zeros(img.rows, img.cols, CV_8UC1); drawContours(image_drawfindcontours, contours_tmp, -1, cv::Scalar::all(255), 8)...
取值一:CV_CHAIN_APPROX_NONE 保存物体边界上所有连续的轮廓点到contours向量内; 取值二:CV_CHAIN_APPROX_SIMPLE 仅保存轮廓的拐点信息,把所有轮廓拐点处的点保存入contours向量内,拐点与拐点之间直线段上的信息点不予保留; 取值三和四:CV_CHAIN_APPROX_TC89_L1,CV_CHAIN_APPROX_TC89_KCOS使用teh-Chinl chain 近...
hierarchy – Optional information about hierarchy. It is only needed if you want to draw only some of the contours (see maxLevel ). maxLevel – Maximal level for drawn contours. If it is 0, only the specified contour is drawn. If it is 1, the function draws the contour(s) and all ...
The function finds the four vertices of a rotated rectangle. This function is useful to draw the rectangle. In C++, instead of using this function, you can directly use RotatedRect::points method. Please visit the tutorial on Creating Bounding rotated boxes and ellipses for contours ...
// Let's now draw black contours on white image //result.setTo(Scalar(0)); //If the third parameter of this function is a negative value, then all contours are drawn. //Otherwise, it is possible to specify the index of the contour to be drawn ...
binary, contours, hierarchy = cv2.findContours(thresh, cv2.RETR_TREE, cv2.CHAIN_APPROX_NONE) 当然这个函数在不同版本下的形态不一样 if you are using an old tutorialcv2.findContours()function returns 3 value but if you are using later versions it returns 2 value so you can remove first variab...
Look at the definition of the find contours function in the opencv documentation and see the parameters (link): void findContours(InputOutputArray image, OutputArrayOfArrays contours, OutputArray hierarchy, int mode, int method, Point offset=Point()) Parameters: here Look at contours, like Rafa...
contours包内自带的画轮廓的函数,可以直接用,然后可以在图片上标出轮廓序号 也可以直接使用cv2.drawContours直接画轮廓 '''img = cv2.imread(r"D:\opencv-workspace\Opencv\test17--VScode\shapes.png") draw_img = img.copy() img_rect = img.copy() ...
经过几个月的努力，小白终于完成了市面上第一本OpenCV 4入门书籍《从零学习OpenCV 4》。为了更让小...