opencv讀取RGB長條圖

// text.cpp : Defines the entry point for the console application.//#include "stdafx.h"#include "highgui.h"#include "cv.h"#include "cxcore.h"#include <iostream>//#include <math.h> using namespace std;void main(int argc,char** argv){IplImage *src = cvLoadImage("de.png",1);//IplImage *hsv= cvCreateImage(cvGetSize(src),8,3);//cvCvtColor(src,hsv,CV_RGB2HSV);IplImage* r_plane = cvCreateImage(cvGetSize(src),8,1);IplImage* g_plane = cvCreateImage(cvGetSize(src),8,1);IplImage* b_plane = cvCreateImage(cvGetSize(src),8,1);//IplImage* planes[] = {h_plane,s_plane};cvCvtPixToPlane(src,b_plane,g_plane,r_plane,0);//openCV裡面的一個函數,可以看作cvSplit是他的宏:#define cvCvtPixToPlane cvSplit                                                //注意順序為BGR,OpenCV中不管是Windows中Load的還是網路攝影機取得的都是BGR順序排列的//計算長條圖//int h_bins = 100,s_bins = 32;int hist_size = 100;int hist_height = 100;float range[] = {0,255};float* ranges[] = {range};CvHistogram* r_hist = cvCreateHist(1,&hist_size,CV_HIST_ARRAY,ranges,1);CvHistogram* g_hist = cvCreateHist(1,&hist_size,CV_HIST_ARRAY,ranges,1);CvHistogram* b_hist = cvCreateHist(1,&hist_size,CV_HIST_ARRAY,ranges,1);cvCalcHist(&r_plane,r_hist,0,0);cvNormalizeHist(r_hist,1.0);cvCalcHist(&g_plane,g_hist,0,0);cvNormalizeHist(g_hist,1.0);cvCalcHist(&b_plane,b_hist,0,0);cvNormalizeHist(b_hist,1.0);//建立映像繪製長條圖int scale = 2;IplImage* hist_img = cvCreateImage(cvSize(hist_size*scale,hist_height*3),8,3);cvZero(hist_img);//繪製矩形表示長條圖float max_valr = 0,max_valg = 0,max_valb = 0;cvGetMinMaxHistValue(r_hist,0,&max_valr,0,0);cvGetMinMaxHistValue(g_hist,0,&max_valg,0,0);cvGetMinMaxHistValue(b_hist,0,&max_valb,0,0);for(int i = 0;i<hist_size;i++){float bin_val = cvQueryHistValue_1D(r_hist,i);int intensity = cvRound(bin_val*hist_height/max_valr);  //int cvRound (double value)對一個double型的數進行四捨五入，並返回一個整型數！cvRectangle(hist_img,cvPoint(i*scale,hist_height),cvPoint((i+1)*scale-1,hist_height-intensity),CV_RGB(255,0,0));}for(int i = 0;i<hist_size;i++){float bin_val = cvQueryHistValue_1D(g_hist,i);int intensity = cvRound(bin_val*hist_height/max_valg);  //int cvRound (double value)對一個double型的數進行四捨五入，並返回一個整型數！cvRectangle(hist_img,cvPoint(i*scale,2*hist_height),cvPoint((i+1)*scale-1,2*hist_height-intensity),CV_RGB(0,255,0));}for(int i = 0;i<hist_size;i++){float bin_val = cvQueryHistValue_1D(b_hist,i);int intensity = cvRound(bin_val*hist_height/max_valb);  //int cvRound (double value)對一個double型的數進行四捨五入，並返回一個整型數！cvRectangle(hist_img,cvPoint(i*scale,3*hist_height),cvPoint((i+1)*scale-1,3*hist_height-intensity),CV_RGB(0,0,255));}cvNamedWindow("histogram",1);cvShowImage("histogram",hist_img);cvNamedWindow("src",1);cvShowImage("src",src);//cvNamedWindow("hsv",1);//cvShowImage("hsv",hsv);cvWaitKey(0);cvDestroyWindow("src");cvReleaseImage(&src);cvDestroyWindow("r_plane");cvReleaseImage(&r_plane);cvDestroyWindow("g_plane");cvReleaseImage(&r_plane);cvDestroyWindow("g_plane");cvReleaseImage(&b_plane);cvDestroyWindow("b_plane");cvReleaseImage(&src);cvDestroyWindow("histogram");cvReleaseImage(&hist_img);}