For example, there might be a table with text in rows. How could I find all straight, horizontal lines going through the table? E.g. (red lines are the found lines):
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3This is my result using `morph-op` :https://i.stack.imgur.com/5ysGA.png – Kinght 金 Dec 06 '17 at 05:36
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A simple color segmentation using `cv2.inRange()` would work well here – ZdaR Dec 06 '17 at 05:38
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Is the color of the line always the same? – janu777 Dec 06 '17 at 05:55
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@Silencer that is the correct answer, you should write it as an answer for completeness :) – api55 Dec 06 '17 at 12:25
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@api55 Ok, I'll write the answer. – Kinght 金 Dec 06 '17 at 13:08
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Just for this question, to detect the horizontal lines, the morph-op is enough.
import cv2
img = cv2.imread("test.jpg")
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
kernel = np.ones((1,100), np.uint8)
morphed = cv2.morphologyEx(gray, cv2.MORPH_CLOSE, kernel)
cv2.imshow("res", morphed);cv2.waitKey();cv2.destroyAllWindows()
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