实现图像pyramids

此代码是在许久之前编写一个简单实现图像pyramids.贴出来共大家分享。

''' file name : pyramids.py
Description : This sample shows how to downsample and upsample images'''

import cv2
import numpy as np

img = cv2.imread('test.jpg')

print " Zoom In-Out demo "
print " Press u to zoom "
print " Press d to zoom "

img = cv2.imread('test.jpg')

while(1):
    h,w = img.shape[:2]
    
    cv2.imshow('image',img)
    k = cv2.waitKey(10)
    
    if k==27 :
        break

    elif k == ord('u'): # Zoom in, make image double size
        img = cv2.pyrUp(img,dstsize = (2*w,2*h))

    elif k == ord('d'): # Zoom down, make image half the size
        img = cv2.pyrDown(img,dstsize = (w/2,h/2))

cv2.destroyAllWindows() 

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