make edges clearer in image

asked 2019-02-21 06:07:59 -0600

I'm currently preprocessing a few images before I can use them for edge detection and I need to make the edges more clear so that the edge algorithm (Canny and Hough) can find them more easily without the need to reconfigure the thresholds. The only important part of the photo that I need are the edges from the items on the pile, the rest is irrelevant.

I have the following images: image description

How would you make the edges between the items on the pile stand out?

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show, what you have, so far, and the code for it ?

berak ( 2019-02-21 06:22:53 -0600 )edit

I've currently tried the following:

# Remove some noise by closing (erode and dilate)
kernel = np.ones((5, 5), np.uint8)
image_to_process = cv.morphologyEx(image_to_process, cv.MORPH_OPEN, kernel)
process_image_hsv = cv.cvtColor(image_to_process, cv.COLOR_BGR2HSV)

# Mask the image
lower_bound = np.array([13, 34, 0], np.uint8)
upper_bound = np.array([69, 255, 57], np.uint8)

mask1 = cv.inRange(process_image_hsv, lower_bound, upper_bound)
mask1 = cv.bitwise_not(mask1)

lower_bound = np.array([5, 84, 9], np.uint8)
upper_bound = np.array([20, 255, 157], np.uint8)

mask2 = cv.inRange(process_image_hsv, lower_bound, upper_bound)
mask2 = cv.bitwise_not(mask2)

mask = cv.addWeighted(mask1, 0.5, mask2, 0.5, 1 )

Tom_ColdenhoffVMT ( 2019-02-21 06:31:32 -0600 )edit

with the following results: image description

EDIT: images don't seem to load. Here are the URL's https://imgur.com/a/LDxzY6M https://imgur.com/a/OxdRbEs

Tom_ColdenhoffVMT ( 2019-02-21 06:34:04 -0600 )edit

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Mat img, gaussImg, laplaceImg, thresholdImg, lineImg, markupImg; img = imread("Clipboard01.png"); cvtColor(img, gaussImg, COLOR_BGR2GRAY); for (int i = 0; i < 8; i++) { GaussianBlur( gaussImg, gaussImg, Size(3, 3), 0.5, 0.5, 4); } Laplacian(gaussImg, laplaceImg, CV_8UC1, 5); threshold(laplaceImg, thresholdImg, 125, 255, THRESH_BINARY); vector <Vec4i> lineList; HoughLinesP(thresholdImg, lineList, 1.0, 1.0 * CV_PI / 180.0, 100, 100, 4); cvtColor(thresholdImg, markupImg, COLOR_GRAY2BGR); for (auto& ptList : lineList) { line(markupImg, Point(ptList(0), ptList(1)), Point(ptList(2), ptList(3)), Scalar(200, 0, 200)); }

make edges clearer in image

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make edges clearer in image