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I got ValueError: operands could not be broadcast together with shapes (194,259,3) (600,800,3) with the below code:

import numpy 
import math
import cv2
original = cv2.imread("original.png")
contrast = cv2.imread("compressed.png",1)
def psnr(img1, img2):
    mse = numpy.mean( (img1 - img2) ** 2 )
    if mse == 0:
        return 100
    PIXEL_MAX = 255.0
    return 20 * math.log10(PIXEL_MAX / math.sqrt(mse))

d=psnr(original,contrast)
print(d)

What was the problem with the implementation?

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1 Answer 1

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It sounds like the error is indicating that the two images aren't the same size. So you can't subtract them point for point.

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