[Python] Remove contours that are almost straight with opencv

I have a raster image where I am trying to remove contours that touch the image border, that are short, and that are not straight or circular. However, I have not been able to remove lines that are almost straight. I figured I could compare absolute distance between vertices to length of the contour, but was not successful.

Code to filter contours

for c in contours:
# # Filter contours based on length
if cv.arcLength(c, True) < image_length * 0.1:
continue
# Check if contour touches the image border
touches_border = False
for point in c:
x, y = point[0]
if x <= 0 or y <= 0 or x >= width - 1 or y >= height - 1:
touches_border = True
break
if touches_border:
continue # Skip contours that touch the border


example image:



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