how to use float number as opencv image pixel coordinates

Question

I have a texture image and some uv coordinators (some float 2D vectors). Is there any method in OpenCV can automatically interpolate the image and then I can directly use these float number as the pixel coordinator and get the correct pixel value?

I think it should be possible because in some computer vision algorithms like optic flow we will always have some sub pixel value...

Answer 1

Remap is what you want, here is an example:

import cv2
import numpy as np

img = cv2.imread('myimage.png')
interpolated_pixel = cv2.remap(img, np.array([[2.4]], np.float32), np.array([[5.4]], np.float32), cv2.INTER_LINEAR)
print(interpolated_pixel)

You can play with different interpolation schemes, see interpolation flags

Of course you can also batch your request by providing multiple uv coordinates.