只是for this question,为了检测horizontal lines,morph-op就足够了.
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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