python手记（25）

pyopencv使用，首先安装好opecv,在官网http://opencv.org/上下载并安装，然后将其python绑定库opencv\build\python\2.7\cv2.pyd复制到python2.x的Lib/Sitepackage目录下

然后进行测试，复制以下代码 ，如果运行正常，则表示安装成功，注意要安装numpy库

 

#!/usr/bin/env python



'''

browse.py

=========



Sample shows how to implement a simple hi resolution image navigation



Usage

-----

browse.py [image filename]



'''



import numpy as np

import cv2

import sys



if __name__ == '__main__':

    print 'This sample shows how to implement a simple hi resolution image navigation.'

    print 'USAGE: browse.py [image filename]'

    print



    if len(sys.argv) > 1:

        fn = sys.argv[1]

        print 'loading %s ...' % fn

        img = cv2.imread(fn)

    else:

        sz = 4096

        print 'generating %dx%d procedural image ...' % (sz, sz)

        img = np.zeros((sz, sz), np.uint8)

        track = np.cumsum(np.random.rand(500000, 2)-0.5, axis=0)

        track = np.int32(track*10 + (sz/2, sz/2))

        cv2.polylines(img, [track], 0, 255, 1, cv2.CV_AA)



    small = img

    for i in xrange(3):

        small = cv2.pyrDown(small)



    def onmouse(event, x, y, flags, param):

        h, w = img.shape[:2]

        h1, w1 = small.shape[:2]

        x, y = 1.0*x*h/h1, 1.0*y*h/h1

        zoom = cv2.getRectSubPix(img, (800, 600), (x+0.5, y+0.5))

        cv2.imshow('zoom', zoom)



    cv2.imshow('preview', small)

    cv2.setMouseCallback('preview', onmouse)

    cv2.waitKey()

    cv2.destroyAllWindows()