OpenCV实现图像旋转：90度、180度和270度操作详解

// PixelReadError.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "cv.h"
#include "highgui.h"


int main(int argc, char* argv[])
{
   IplImage * img;
   IplImage * img_Reverse;//旋转180度
   IplImage * img_Rotate_90;//逆时针旋转90度
   IplImage * img_Rotate_270;//逆时针旋转270度
   img = cvLoadImage("1.jpg");
   img_Reverse = cvCreateImage(cvGetSize(img),img->depth,img->nChannels);
   img_Rotate_90 = cvCreateImage(cvSize(img->height,img->width),img->depth,img->nChannels);
   img_Rotate_270 = cvCreateImage(cvSize(img->height,img->width),img->depth,img->nChannels);

   int i,j;
   
for (i = 0; i < img->height; i++)
   for (j = 0; j < img->width; j++)
   {
      ((uchar *)(img_Reverse->imageData + (img->height - i - 1)*img_Reverse->widthStep))[j*img_Reverse->nChannels + 0] =
      ((uchar *)(img->imageData + i*img->widthStep))[j*img->nChannels + 0];
      ((uchar *)(img_Reverse->imageData + (img->height - i - 1)*img_Reverse->widthStep))[j*img_Reverse->nChannels + 1] =
      ((uchar *)(img->imageData + i*img->widthStep))[j*img->nChannels + 1];
      ((uchar *)(img_Reverse->imageData + (img->height - i - 1)*img_Reverse->widthStep))[j*img_Reverse->nChannels + 2] =
      ((uchar *)(img->imageData + i*img->widthStep))[j*img->nChannels + 2];