python-opencv遍歷圖片像素，並對像素進行操作

看代碼：

def access_pixels(frame):
    print(frame.shape)  #shape內包含三個元素：按順序為高、寬、通道數
    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):            #遍歷高
        for col in range(weight):         #遍歷寬
            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，實現一個反向效果
    cv.imshow("fanxiang", frame)
    
    
    
    
image = "D:/Image/test.jpg"
src = cv.imread(image)
cv.imshow("Picture", src)
access_pixels(src)
cv.waitKey(0)