图像灰度值调整（C/C++源代码）

//
// perform histgram equalization for single channel image
//

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

int ImageAdjust(IplImage* src, IplImage* dst,
               double low, double high,   // lowand high are the intensities of src
               double bottom, double top, // mapped to bottom and top of dst
               double gamma )
{
    double low2= low*255;
    double high2= high*255;
    doublebottom2 = bottom*255;
    double top2= top*255;
    doubleerr_in = high2 - low2;
    doubleerr_out = top2 - bottom2;

    intx,y;
    doubleval;

    if(low<0 && low>1 && high <0 &&high>1 && bottom<0 && bottom>1 &&top<0 && top>1)
       return 1;
   
    // intensitytransform
    for( 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 inthe range [low,high]
           ((uchar*)(dst->imageData + dst->widthStep*y))[x] = (uchar)val;
       }
    }
    return0;
}