zhi-fang-tu.rar_tu

#include "cv.h" #include "highgui.h" #include <stdio.h> #include <ctype.h> int main( int argc, char** argv ) { IplImage *src = 0; IplImage *histimg = 0; CvHistogram *hist = 0; int hdims = 50; // 划分HIST的个数，越高越精确 float hranges_arr[] = {0,255}; float* hranges = hranges_arr; int bin_w; float max_val; int i; if( argc != 2 || (src=cvLoadImage(argv[1], 0)) == NULL) // force to gray image return -1; cvNamedWindow( "Histogram", 0 ); cvNamedWindow( "src", 0); hist = cvCreateHist( 1, &hdims, CV_HIST_ARRAY, &hranges, 1 ); // 计算直方图 histimg = cvCreateImage( cvSize(320,200), 8, 3 ); cvZero( histimg ); cvCalcHist( &src, hist, 0, 0 ); // 计算直方图 cvGetMinMaxHistValue( hist, 0, &max_val, 0, 0 ); // 只找最大值 cvConvertScale( hist->bins, hist->bins, max_val ? 255. / max_val : 0., 0 ); // 缩放 bin 到区间 [0,255] cvZero( histimg ); bin_w = histimg->width / hdims; // hdims: 条的个数，则 bin_w 为条的宽度 // 画直方图 for( i = 0; i < hdims; i++ ) { double val = ( cvGetReal1D(hist->bins,i)*histimg->height/255 ); CvScalar color = CV_RGB(255,255,0); //(hsv2rgb(i*180.f/hdims); cvRectangle( histimg, cvPoint(i*bin_w,histimg->height), cvPoint((i+1)*bin_w,(int)(histimg->height - val)), color, 1, 8, 0 ); } cvShowImage( "src", src); cvShowImage( "Histogram", histimg ); cvWaitKey(0); cvDestroyWindow("src"); cvDestroyWindow("Histogram"); cvReleaseImage( &src ); cvReleaseImage( &histimg ); cvReleaseHist ( &hist ); return 0; }