mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-11-24 13:31:07 +00:00
39 lines
811 B
Python
39 lines
811 B
Python
|
import numpy as np
|
||
|
|
import math
|
||
|
|
import cv2
|
||
|
|
|
||
|
|
def Representational(r,g,b):
|
||
|
|
return (0.299*r+0.287*g+0.114*b)
|
||
|
|
|
||
|
|
def calculate(img):
|
||
|
|
b,g,r = cv2.split(img)
|
||
|
|
pixelAt = Representational(r,g,b)
|
||
|
|
return pixelAt
|
||
|
|
|
||
|
|
def main():
|
||
|
|
|
||
|
|
#Loading images (orignal image and compressed image)
|
||
|
|
orignal_image = cv2.imread('orignal_image.png',1)
|
||
|
|
compressed_image = cv2.imread('compressed_image.png',1)
|
||
|
|
|
||
|
|
#Getting image height and width
|
||
|
|
height,width = orignal_image.shape[:2]
|
||
|
|
|
||
|
|
orignalPixelAt = calculate(orignal_image)
|
||
|
|
compressedPixelAt = calculate(compressed_image)
|
||
|
|
|
||
|
|
diff = orignalPixelAt - compressedPixelAt
|
||
|
|
error = np.sum(np.abs(diff) ** 2)
|
||
|
|
|
||
|
|
error = error/(height*width)
|
||
|
|
|
||
|
|
#MSR = error_sum/(height*width)
|
||
|
|
PSNR = -(10*math.log10(error/(255*255)))
|
||
|
|
|
||
|
|
print("PSNR value is {}".format(PSNR))
|
||
|
|
|
||
|
|
|
||
|
|
if __name__ == '__main__':
|
||
|
|
main()
|
||
|
|
|