输入图像：
输出直方图分布图像：
输入图像：
输出直方图分布图像：
#include <cv.h>#include <highgui.h>#include <iostream>using namespace std;int main( int argc, char** argv ){IplImage * src= cvLoadImage("F:\\test3.jpg");IplImage* hsv = cvCreateImage( cvGetSize(src), 8, 3 );IplImage* h_plane = cvCreateImage( cvGetSize(src), 8, 1 );IplImage* s_plane = cvCreateImage( cvGetSize(src), 8, 1 );IplImage* v_plane = cvCreateImage( cvGetSize(src), 8, 1 );IplImage* planes[] = { h_plane, s_plane };/** H 分量划分为16个等级，S分量划分为8个等级 */int h_bins = 16, s_bins = 8;int hist_size[] = {h_bins, s_bins};/** H 分量的变化范围 */float h_ranges[] = { 0, 180 }; /** S 分量的变化范围*/float s_ranges[] = { 0, 255 };float* ranges[] = { h_ranges, s_ranges };/** 输入图像转换到HSV颜色空间 */cvCvtColor( src, hsv, CV_BGR2HSV );cvCvtPixToPlane( hsv, h_plane, s_plane, v_plane, 0 );/** 创建直方图，二维, 每个维度上均分 */CvHistogram * hist = cvCreateHist( 2, hist_size, CV_HIST_ARRAY, ranges, 1 );/** 根据H,S两个平面数据统计直方图 */cvCalcHist( planes, hist, 0, 0 );/** 获取直方图统计的最大值，用于动态显示直方图 */float max_value;cvGetMinMaxHistValue( hist, 0, &max_value, 0, 0 );/** 设置直方图显示图像 */int height = 240;int width = (h_bins*s_bins*6);IplImage* hist_img = cvCreateImage( cvSize(width,height), 8, 3 );cvZero( hist_img );/** 用来进行HSV到RGB颜色转换的临时单位图像 */IplImage * hsv_color = cvCreateImage(cvSize(1,1),8,3);IplImage * rgb_color = cvCreateImage(cvSize(1,1),8,3);int bin_w = width / (h_bins * s_bins);for(int h = 0; h < h_bins; h++){for(int s = 0; s < s_bins; s++){int i = h*s_bins + s;/** 获得直方图中的统计次数，计算显示在图像中的高度 */float bin_val = cvQueryHistValue_2D( hist, h, s );int intensity = cvRound(bin_val*height/max_value);/** 获得当前直方图代表的颜色，转换成RGB用于绘制 */cvSet2D(hsv_color,0,0,cvScalar(h*180.f / h_bins,s*255.f/s_bins,255,0));cvCvtColor(hsv_color,rgb_color,CV_HSV2BGR);CvScalar color = cvGet2D(rgb_color,0,0);cvRectangle( hist_img, cvPoint(i*bin_w,height),cvPoint((i+1)*bin_w,height - intensity),color, -1, 8, 0 );}}cvNamedWindow( "Source", 1 );cvShowImage( "Source", src );cvNamedWindow( "H-S Histogram", 1 );cvShowImage( "H-S Histogram", hist_img );cvWaitKey(0);}
对于颜色直方图的统计，应该还可以用更多的该进，诸如当S分量小于给定值时，不同H，人眼看上去都是白色，可以将这些颜色的统计归并到白色中去。
[编辑]
作者
Pigoneand 猪逻辑公园出处：.cn/index.php/%E5%9B%BE%E5%83%8F%E9%A2%9C%E8%89%B2%E5%88%86%E5%B8%83%E7%9B%B4%E6%96%B9%E5%9B%BE
