OpenCV warpperspective

Question

For some reason whenever I use OpenCV\'s warpPerspective() function, the final warped image does not contain everything in the original image. The left part of the image see

Answer 1

The secret comes in two parts: the transform matrix (homography), and the resulting image size.

• calculate a correct transform by using the getPerspectiveTransform(). Take 4 points from the original image, calculate their correct position in the destination, put them in two vectors in the same order, and use them to compute the perspective transform matrix.

• Make sure the destination image size (third parameter for the warpPerspective()) is exactly what you want. Define it as Size(myWidth, myHeight).