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python图像处理之镜像实现方法

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2016-06-06 11:17:332523browse

本文实例讲述了python图像处理之镜像实现方法。分享给大家供大家参考。具体分析如下:

图像的镜像变化不改变图像的形状。图像的镜像变换分为三种:水平镜像、垂直镜像、对角镜像

设图像的大小为M×N,则

水平镜像可按公式

I = i

J = N - j + 1

垂直镜像可按公式

I = M - i + 1

J = j

对角镜像可按公式

I = M - i + 1

J = N - j + 1

值得注意的是在OpenCV中坐标是从[0,0]开始的

所以,式中的 +1 在编程时需要改为 -1

这里运行环境为:

Python为:Python2.7.6
OpenCV2.4.10版(可到http://sourceforge.net/projects/opencvlibrary/files/opencv-win/下载)
numpy为:numpy-1.9.1-win32-superpack-python2.7(可到http://sourceforge.net/projects/numpy/files/NumPy/1.9.1/下载)

下面的代码仍以baby美图为例具体程序如下:

import cv2.cv as cv
image = cv.LoadImage('angelababy.jpg',1)
size = (image.width,image.height)
iUD = cv.CreateImage(size,image.depth,image.nChannels)
iLR = cv.CreateImage(size,image.depth,image.nChannels)
iAcross = cv.CreateImage(size,image.depth,image.nChannels)
h = image.height
w = image.width
for i in range(h):
  for j in range(w):
    iUD[h-1-i,j] = image[i,j]
    iLR[i,w-1-j] = image[i,j]
    iAcross[h-1-i,w-1-j] = image[i,j]
cv.ShowImage('image',image)
cv.ShowImage('iUD',iUD)
cv.ShowImage('iLR',iLR)
cv.ShowImage('iAcross',iAcross)
cv.WaitKey(0)

运行结果如下图所示:

希望本文所述对大家的Python程序设计有所帮助。

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