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lines = cv2.HoughLinesP(thresh, 1, np.pi/180, 30, maxLineGap=200)
# create a copy of the original frame
dmy = col_images[idx][:,:,0].copy()
# draw Hough lines
for line in lines:
x1, y1, x2, y2 = line[0]
cv2.line(dmy, (x1, y1), (x2, y2), (255, 0, 0), 3)
# plot frame
plt.imshow(dmy, cmap= "gray")
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