python-opencv遍历图片像素，并对像素进行操作

看代码：

def access_pixels(frame):
    print(frame.shape)  #shape内包含三个元素：按顺序为高、宽、通道数
    height = frame.shape[0]
    weight = frame.shape[1]
    channels = frame.shape[2]
    print("weight : %s, height : %s, channel : %s" %(weight, height, channels))

    for row in range(height):            #遍历高
        for col in range(weight):         #遍历宽
            for c in range(channels):     #便利通道
                pv = frame[row, col, c]
                frame[row, col, c] = 255 - pv     #全部像素取反，实现一个反向效果
    cv.imshow("fanxiang", frame)

image = "D:/Image/test.jpg"
src = cv.imread(image)
cv.imshow("Picture", src)
access_pixels(src)
cv.waitKey(0)