Detecting near-horizontal lines using Image processing-CodePudding

Is there any way to use opencv to detect lines that are nearly horizontal? I've muddled my way through some of the concepts mentioned in

CodePudding user response：

You can find the angle by which the line is parallel to ground by using tan inverse.

for x1,y1,x2,y2 in lines[0]:
   angle = math.degrees(math.atan((abs(y2-y1))/abs(x2-x1)))
   cv2.line(img2,(x1,y1),(x2,y2),(255,0,0),1)
   print(angle)

Then you can filter the lines as told by @Mario. Since above uses abs() to find difference, you will have to filter the angles only using a positive range.