python图像处理之镜像实现方法
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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