histeq.c
上传用户:banwdc
上传日期:2016-06-25
资源大小:2871k
文件大小:2k
- #include "cv.h"
- #include "highgui.h"
- #define HDIM 256 // bin of HIST, default = 256
- int main( int argc, char** argv )
- {
- IplImage *src = 0, *dst = 0;
- CvHistogram *hist = 0;
-
- int n = HDIM;
- double nn[HDIM];
- uchar T[HDIM];
- CvMat *T_mat;
-
- int x;
- int sum = 0; // sum of pixels of the source image 图像中象素点的总和
- double val = 0;
-
- if( argc != 2 || (src=cvLoadImage(argv[1], 0)) == NULL) // force to gray image
- return -1;
-
- 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 );
-
- // Create Accumulative Distribute Function of histgram
- 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); // range is [0,255]
- }
- // Using look-up table to perform intensity transform for source image
- 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);
- cvDestroyWindow("source");
- cvDestroyWindow("result");
- cvReleaseImage( &src );
- cvReleaseImage( &dst );
- cvReleaseHist ( &hist );
-
- return 0;
- }