0021-python比较两张图片是否一致

def checkImgIsSameByMD5Hash(img1,img2):
    img_data1 = numpy.array(Image.open(img1))
    img_data2 = numpy.array(Image.open(img2))
    imgMD51 = hashlib.md5(img_data1).hexdigest()
    imgMD52 = hashlib.md5(img_data2).hexdigest()
    if imgMD51==imgMD52:
        return True
    else:
        return False


from PIL import Image
from PIL import ImageChops 

def compare_images(path_one, path_two, diff_save_location):
    """
    比较图片，如果有不同则生成展示不同的图片
 
    @参数一: path_one: 第一张图片的路径
    @参数二: path_two: 第二张图片的路径
    @参数三: diff_save_location: 不同图的保存路径
    """
    image_one = Image.open(path_one)
    image_two = Image.open(path_two)
    try: 
        diff = ImageChops.difference(image_one, image_two)
 

        if diff.getbbox() is None:
        # 图片间没有任何不同则直接退出
            print("【+】We are the same!")
        else:
            diff.save(diff_save_location)
    except ValueError as e:
        text = ("表示图片大小和box对应的宽度不一致，参考API说明：Pastes another image into this image."
                "The box argument is either a 2-tuple giving the upper left corner, a 4-tuple defining the left, upper, "
                "right, and lower pixel coordinate, or None (same as (0, 0)). If a 4-tuple is given, the size of the pasted "
                "image must match the size of the region.使用2纬的box避免上述问题")
        print("【{0}】{1}".format(e,text)) 

 
if __name__ == '__main__':
    compare_images('1.png',
                   '2.png',
                   '我们不一样.png')





###第三种方法
from PIL import Image
import math
import operator
from functools import reduce


def image_contrast(img1, img2):

    image1 = Image.open(img1)
    image2 = Image.open(img2)

    h1 = image1.histogram()
    h2 = image2.histogram()

    result = math.sqrt(reduce(operator.add,  list(map(lambda a,b: (a-b)**2, h1, h2)))/len(h1) )
    return result

if __name__ == '__main__':
    img1 = "./1.png"  # 指定图片路径
    img2 = "./2.png"
    result = image_contrast(img1,img2)
    print(result)




#方案三
import cv2
import numpy as np
image1 = cv2.imread('A.jpg')
image2 = cv2.imread('B.jpg')
difference = cv2.subtract(image1, image2)
result = not np.any(difference) #if difference is all zeros it will return False
if result is True:
     print("两张图片一样")
else:
     cv2.imwrite("result.jpg", difference)
 
     print ("两张图片不一样")