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    <p>Here's what I came up with after a bit of experimentation:</p> <pre><code>import cv, cv2, numpy as np import sys def get_new(old): new = np.ones(old.shape, np.uint8) cv2.bitwise_not(new,new) return new if __name__ == '__main__': orig = cv2.imread(sys.argv[1]) # these constants are carefully picked MORPH = 9 CANNY = 84 HOUGH = 25 img = cv2.cvtColor(orig, cv2.COLOR_BGR2GRAY) cv2.GaussianBlur(img, (3,3), 0, img) # this is to recognize white on white kernel = cv2.getStructuringElement(cv2.MORPH_RECT,(MORPH,MORPH)) dilated = cv2.dilate(img, kernel) edges = cv2.Canny(dilated, 0, CANNY, apertureSize=3) lines = cv2.HoughLinesP(edges, 1, 3.14/180, HOUGH) for line in lines[0]: cv2.line(edges, (line[0], line[1]), (line[2], line[3]), (255,0,0), 2, 8) # finding contours contours, _ = cv2.findContours(edges.copy(), cv.CV_RETR_EXTERNAL, cv.CV_CHAIN_APPROX_TC89_KCOS) contours = filter(lambda cont: cv2.arcLength(cont, False) &gt; 100, contours) contours = filter(lambda cont: cv2.contourArea(cont) &gt; 10000, contours) # simplify contours down to polygons rects = [] for cont in contours: rect = cv2.approxPolyDP(cont, 40, True).copy().reshape(-1, 2) rects.append(rect) # that's basically it cv2.drawContours(orig, rects,-1,(0,255,0),1) # show only contours new = get_new(img) cv2.drawContours(new, rects,-1,(0,255,0),1) cv2.GaussianBlur(new, (9,9), 0, new) new = cv2.Canny(new, 0, CANNY, apertureSize=3) cv2.namedWindow('result', cv2.WINDOW_NORMAL) cv2.imshow('result', orig) cv2.waitKey(0) cv2.imshow('result', dilated) cv2.waitKey(0) cv2.imshow('result', edges) cv2.waitKey(0) cv2.imshow('result', new) cv2.waitKey(0) cv2.destroyAllWindows() </code></pre> <p>Not perfect, but at least works for all samples:</p> <p><img src="https://i.stack.imgur.com/kJcOp.png" alt="1"> <img src="https://i.stack.imgur.com/AX0rz.png" alt="2"> <img src="https://i.stack.imgur.com/el90f.png" alt="3"> <img src="https://i.stack.imgur.com/QAyJM.png" alt="4"></p>
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    1. POAlgorithm to detect corners of paper sheet in photo
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    1. USVanuan
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    1. COI'm working on the similar project. I run above the code and it gives me the error " No module named cv ". I installed the Open CV 2.4 version and import cv2 is working perfectly for me.
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      1. USNavneet Singh
 

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