| # create a zero array | |
| stencil = np.zeros_like(col_images[idx][:,:,0]) | |
| # specify coordinates of the polygon | |
| polygon = np.array([[50,270], [220,160], [360,160], [480,270]]) | |
| # fill polygon with ones | |
| cv2.fillConvexPoly(stencil, polygon, 1) |
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