CODEWITHSUNDEEP
pythonopencv
JasonGan
JasonGan

Reputation: 13

OpenCV warpAffine always return 0 matrix

I am using python opencv version 4.5.

import cv2
import numpy as np

rigidRect = np.float32([[50,-50],[50,50],[-50,50]])
shiftRect = np.float32([[50,-30],[50,70],[-50,70]])

M = cv2.getAffineTransform(rigidRect, shiftRect) #this return [[1,0,0],[0,1,20]]
validateRect = cv2.warpAffine(rigidRect, M, (2,3))

and validateRect return a 3 by 2 zeroes matrix. I thought validateRect will equal to shiftRect?

Upvotes: 1

Views: 563

Answers (1)

Burak
Burak

Reputation: 2495

warpAffine is used to transform an image using the affine transform matrix. What you are trying to do is to transform the given points, which is achieved by the transform function. Documentation of getAffineTransform gives hint about related functions in see also part.

validateRect = cv2.transform(rigidRect[None,:,:], M)

Upvotes: 2

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