直方图均衡化

#include "highgui.h"#include "cv.h"#include <iostream>#include <iomanip>using namespace std;#define HDIM 256 //直方图的维数int main(){IplImage* src = cvLoadImage("lena.jpg",0);IplImage* dst = NULL;CvHistogram* hist =0;int n = HDIM;double nn[HDIM];uchar T[HDIM];CvMat *T_mat;int x;int sum;//图像中像素总和double val = 0;cvNamedWindow("source",1);cvNamedWindow("result",1);//计算直方图hist = cvCreateHist(1,&n,CV_HIST_ARRAY,0,1);cvCalcHist(&src,hist,0,0);val = 0;for (x=0;x<n;x++){val = val + cvGetReal1D(hist->bins,x);nn[x] = val;}//归一化直方图sum = src->height*src->width;for (x=0;x<n;x++){T[x] = (uchar)(255*nn[x]/sum);}dst = cvCloneImage(src);T_mat = cvCreateMatHeader(1,256,CV_8UC1);cvSetData(T_mat,T,0);//直接调用内部函数完成look-up-table的过程cvLUT(src,dst,T_mat);cvShowImage("source",src);cvShowImage("result",dst);cvWaitKey(0);cvReleaseImage(&src);cvReleaseImage(&dst);cvDestroyAllWindows();}