compare.py

# pip install opencv-python
import cv2

img1 = cv2.imread("a.png", cv2.IMREAD_GRAYSCALE)
img2 = cv2.imread("a_sample.png", cv2.IMREAD_GRAYSCALE)

def calc_hist(img):
    hist = cv2.calcHist([img], channels=[0], mask=None, histSize=[256], ranges=[0, 256])
    hist = cv2.normalize(hist, hist, 0, 255, cv2.NORM_MINMAX)
    hist = hist.squeeze(axis=-1)

    return hist


hist1 = calc_hist(img1)
hist2 = calc_hist(img2)

score = cv2.compareHist(hist1, hist2, cv2.HISTCMP_CORREL)
# 数字越靠近1越是同一张图
print(score)