#include "cv.h"
#include "highgui.h"
#include <stdio.h>
int ImageAdjust(IplImage *src,IplImage *dst,double low,double high,        //x directiondouble bottom,double top,    //y directiondouble gamma);
int main(void)
{char *filename="lena.jpg";IplImage *dst,*src = /blog.armyourlife.info/cvLoadImage(filename,0);if(!src){printf("Couldn't seem to Open %s, sorry/n",filename);return -1;}cvNamedWindow( "src", 1 );cvNamedWindow( "result", 1 );// Image adjustdst = cvCloneImage(src);// 输入参数 [0,0.5] 和 [0.5,1], gamma=1if( ImageAdjust( src, dst, 0, 0.5, 0.5, 1, 1)!=0)return -1;cvShowImage( "src", src );cvShowImage( "result", dst );cvWaitKey(0);cvDestroyWindow("src");cvDestroyWindow("result");cvReleaseImage( &src );cvReleaseImage( &dst );return 0;
}
int ImageAdjust(IplImage* src, IplImage* dst,double low, double high,   // X方向：low and high are the intensities of srcdouble bottom, double top, // Y方向：mapped to bottom and top of dstdouble gamma )
{double low2 = low*255;double high2 = high*255;double bottom2 = bottom*255;double top2 = top*255;double err_in = high2 - low2;double err_out = top2 - bottom2;int x,y;double val;if(low<0 && low>1 && high <0 && high>1&&bottom<0 && bottom>1 && top<0 && top>1 && low>high)return -1;// intensity transformfor( y = 0; y < src->height; y++){for (x = 0; x < src->width; x++){val = ((uchar*)(src->imageData + src->widthStep*y))[x];val=pow((val - low2)/err_in, gamma)*err_out+bottom2;if(val>255)val=255;if(val<0)val=0; // Make sure src is in the range [low,high]((uchar*)(dst->imageData + dst->widthStep*y))[x] = (uchar) val;}}return 0;
}