opencv_019.py

import cv2 as cv
import numpy as np

src1 = cv.imread("./test.png") 
src2 = cv.imread("./Mat.png") 
src3 = cv.imread("./test.png") 
src4 = cv.imread("./test.png") 

cv.imshow("input1", src1)
cv.imshow("input2", src2)
cv.imshow("input3", src3)
cv.imshow("input4", src4)

hsv1 = cv.cvtColor(src1, cv.COLOR_BGR2HSV)
hsv2 = cv.cvtColor(src2, cv.COLOR_BGR2HSV)
hsv3 = cv.cvtColor(src3, cv.COLOR_BGR2HSV)
hsv4 = cv.cvtColor(src4, cv.COLOR_BGR2HSV)

hist1 = cv.calcHist([hsv1], [0, 1], None, [60, 64], [0, 180, 0, 256])
hist2 = cv.calcHist([hsv2], [0, 1], None, [60, 64], [0, 180, 0, 256])
hist3 = cv.calcHist([hsv3], [0, 1], None, [60, 64], [0, 180, 0, 256])
hist4 = cv.calcHist([hsv4], [0, 1], None, [60, 64], [0, 180, 0, 256])

cv.normalize(hist1, hist1, 0, 1.0, cv.NORM_MINMAX)
cv.normalize(hist2, hist2, 0, 1.0, cv.NORM_MINMAX)
cv.normalize(hist3, hist3, 0, 1.0, cv.NORM_MINMAX)
cv.normalize(hist4, hist4, 0, 1.0, cv.NORM_MINMAX)

methods = [cv.HISTCMP_CORREL, cv.HISTCMP_CHISQR,
           cv.HISTCMP_INTERSECT, cv.HISTCMP_BHATTACHARYYA]
str_method = ""
for method in methods:
    src1_src2 = cv.compareHist(hist1, hist2, method)
    src3_src4 = cv.compareHist(hist3, hist4, method)
    if method == cv.HISTCMP_CORREL:
        str_method = "Correlation"
    if method == cv.HISTCMP_CHISQR:
        str_method = "Chi-square"
    if method == cv.HISTCMP_INTERSECT:
        str_method = "Intersection"
    if method == cv.HISTCMP_BHATTACHARYYA:
        str_method = "Bhattacharyya"

    print("%s src1_src2 = %.2f, src3_src4 = %.2f"%(str_method, src1_src2, src3_src4))


cv.waitKey(0)
cv.destroyAllWindows()