16. Transform a Stop Sign

Examples of Useful Code

Compute the perspective transform, M, given source and destination points:

M = cv2.getPerspectiveTransform(src, dst)

Compute the inverse perspective transform:

Minv = cv2.getPerspectiveTransform(dst, src)

Warp an image using the perspective transform, M:

warped = cv2.warpPerspective(img, M, img_size, flags=cv2.INTER_LINEAR)

Note : When you apply a perspective transform, choosing four source points manually, as we did in this video, is often not the best option. There are many other ways to select source points. For example, many perspective transform algorithms will programmatically detect four source points in an image based on edge or corner detection and analyzing attributes like color and surrounding pixels.