Vector::const_iterator points_it // declaring points iteratorįor( points_it = circles.begin() points_it != circles. 4 Answers Sorted by: 272 please don't try with the old cv module, use cv2: import cv2 cv2.rectangle (img, (x1, y1), (x2, y2), (255,0,0), 2) x1,y1 -x2,y2 to append the follow-up questions below: cv2.imwrite ('my.png',img) cv2.imshow ('lalala', img) k cv2. I would like to add a semi-transparent rectangle filled with a solid colour to an already loaded semi-transparent PNG.imwrite(file, x) def showImage(data). Add transparency to rectangles, circles, polgons, text or any shape drawn in OpenCV. How to draw an overlay that matches the shape of an image with a transparent. 31 I draw some rectangles in OpenCV and put text in them. change this section to draw the shapes you want to draw adding to alexander taubenkorbs answer, you can draw random (semi-transparent) shapes by replacing the cv::rectangle line with the shape you want to draw. cv::rectangle(image, rectangle, cv::Scalar(255,255,255),1). pyto(overlay) // copying the source image to overlay matrix, we'll be drawing shapes on overlay matrix and we'll blend it with original image startpoint: It is the starting coordinates of. Syntax: cv2.rectangle (image, startpoint, endpoint, color, thickness) Parameters: image: It is the image on which rectangle is to be drawn. cv2.rectangle () method is used to draw a rectangle on any image. ![]() Adding to alexander taubenkorb's answer, you can draw random (semi-transparent) shapes by replacing the cv::rectangle line with the shape you want to draw.įor example, if you want to draw a series of semi-transparent circles, you can do it as follows: cv::mat source = cv::imread("img_2083s.png") // loading the source imageĬv::mat overlay // declaring overlay matrix, we'll copy source image to this matrixĭouble alpha = 0.3 // defining opacity value, 0 means fully transparent, 1 means fully opaque OpenCV-Python is a library of Python bindings designed to solve computer vision problems.
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