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39 lines
811 B
Python
39 lines
811 B
Python
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import numpy as np
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import math
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import cv2
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def Representational(r,g,b):
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return (0.299*r+0.287*g+0.114*b)
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def calculate(img):
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b,g,r = cv2.split(img)
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pixelAt = Representational(r,g,b)
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return pixelAt
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def main():
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#Loading images (orignal image and compressed image)
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orignal_image = cv2.imread('orignal_image.png',1)
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compressed_image = cv2.imread('compressed_image.png',1)
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#Getting image height and width
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height,width = orignal_image.shape[:2]
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orignalPixelAt = calculate(orignal_image)
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compressedPixelAt = calculate(compressed_image)
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diff = orignalPixelAt - compressedPixelAt
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error = np.sum(np.abs(diff) ** 2)
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error = error/(height*width)
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#MSR = error_sum/(height*width)
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PSNR = -(10*math.log10(error/(255*255)))
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print("PSNR value is {}".format(PSNR))
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if __name__ == '__main__':
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main()
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