Python opencv(3)获取图像大小

图像矩阵的shape属性表示图像的大小，shape会返回tuple元组，第一个元素表示矩阵行数，第二个元组表示矩阵列数，第三个元素是3，表示像素值由光的三原色组成。

import cv2
import numpy as np
fn="baboon.jpg"
if __name__ == '__main__':
    print 'load %s as ...' % fn
    img = cv2.imread(fn)
    sp = img.shape
    print sp
    sz1 = sp[0]#height(rows) of image
    sz2 = sp[1]#width(colums) of image
    sz3 = sp[2]#the pixels value is made up of three primary colors
    print 'width: %d \nheight: %d \nnumber: %d' %(sz1,sz2,sz3)

运行结果：
load baboon.jpg as …
(512, 512, 3)
width: 512
height: 512
number: 3