[問題] opencv範例請教

[GN00505257 (...)]

#include "stdafx.h"
#include <cv.h>
#include <highgui.h>
int main( int argc, char** argv ) {
        IplImage* image;
        image=cvLoadImage("image", 1);
        {
                // Compute the HSV image and decompose it into separate planes.
                //
                IplImage* hsv = cvCreateImage( cvGetSize(image), 8, 3 );
                cvCvtColor( image, hsv, CV_BGR2HSV );
                IplImage* h_plane = cvCreateImage( cvGetSize(image), 8, 1 );
                IplImage* s_plane = cvCreateImage( cvGetSize(image), 8, 1 );
                IplImage* v_plane = cvCreateImage( cvGetSize(image), 8, 1 );
                IplImage* planes[] = { h_plane, s_plane };
                cvCvtPixToPlane( hsv, h_plane, s_plane, v_plane, 0 );

                // Build the histogram and compute its contents.
                //
                int h_bins = 30, s_bins = 32;
                CvHistogram* hist;
                {
                 int hist_size[] = { h_bins, s_bins };
                 float h_ranges[] = { 0, 180 }; // hue is [0,180]
                 float s_ranges[] = { 0, 255 };
                 float* ranges[] = { h_ranges, s_ranges };
                 hist = cvCreateHist(
                        2,
                        hist_size,
                        CV_HIST_ARRAY,
                        ranges,
                        1
                 );
                }
                cvCalcHist( planes, hist, 0, 0 ); //Compute histogram
                cvNormalizeHist( hist, 1.0 ); //Normalize it

                // Create an image to use to visualize our histogram.
                //
                int scale = 10;
                IplImage* hist_img = cvCreateImage(cvSize( h_bins * scale, s_bins * scale )
,8 , 3);
                cvZero( hist_img );

                // populate our visualization with little gray squares.
                //
                float max_value = 0;
                cvGetMinMaxHistValue( hist, 0, &max_value, 0, 0 );

                for( int h = 0; h < h_bins; h++ ) {
                        for( int s = 100; s < s_bins; s++ ) {
                        float bin_val = cvQueryHistValue_2D( hist, h, s );
                        int intensity = cvRound( bin_val * 255 / max_value );
                        cvRectangle(
                          hist_img,
                          cvPoint( h*scale, s*scale ),
                          cvPoint( (h+1)*scale - 1, (s+1)*scale - 1),
                          CV_RGB(intensity,intensity,intensity),
                          CV_FILLED
                        );
                }
        }
        cvNamedWindow( "HSVtest1", 1 );
        cvShowImage( "HSVtest1", image );
        cvWaitKey(0);
        }
}



這是從書上拿下來練習的範例
想練習如何讓圖片只顯示想要的HUE值
但很多部分看不懂為什麼要這麼做
以及函數的功用
煩請高手幫個忙
謝謝@@

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◆ From: 163.25.118.133
→ Jockey66666:先查查document吧，應該不會全部都看不懂吧
→ Jockey66666:不知道你不懂的地方是哪一段，講清楚點比較好回答
※ 編輯: GN00505257      來自: 163.25.118.133       (08/14 00:33)
→ GN00505257:大概是標示起來的地方
→ GN00505257:以及不知道為什麼要使用直方圖做轉換
→ Jockey66666:直方圖只是視覺化H跟S的值而已
→ Jockey66666:這範例不就是要教你怎麼使用histogram嗎?
→ GN00505257:抱歉因為我是先找跟圖像空間轉換相關的範例
→ GN00505257:所以也沒特別去注意範例的真正用意...現在知道了.謝謝