RGB與Ycbcr空間的互相轉換
阿新 • • 發佈：2019-01-04
#include
"stdafx.h"
#include "highgui.h"
#include "cv.h"
#include "cxcore.h"
#include "stdio.h"
int _tmain(int argc, _TCHAR* argv[])
{
float imgy,imgcb,imgcr;
IplImage* img_rgb=cvLoadImage("lena.jpg");
IplImage* ycbcr=cvCreateImage(cvGetSize(img_rgb),8,3);
IplImage* r_img_rgb=cvCreateImage(cvGetSize(img_rgb),8,1);
IplImage* g_img_rgb=cvCreateImage(cvGetSize(img_rgb),8,1);
IplImage* b_img_rgb=cvCreateImage(cvGetSize(img_rgb),8,1);
IplImage* ycb=cvCreateImage(cvGetSize(img_rgb),8,3);
cvCvtColor(img_rgb,ycb,CV_BGR2YCrCb); //方法一，利用opencv內部函式實現
cvSplit(img_rgb,r_img_rgb,g_img_rgb,b_img_rgb,0);//把RGB三通道分為單通道
IplImage* img_y = cvCreateImage (cvSize (img_rgb->width,img_rgb->height),IPL_DEPTH_8U, 1);
IplImage* img_cb= cvCreateImage (cvSize (img_rgb->width,img_rgb->height),IPL_DEPTH_8U, 1);
IplImage* img_cr= cvCreateImage (cvSize (img_rgb->width,img_rgb->height),IPL_DEPTH_8U, 1);
for(int y=0;y<img_rgb->height;y++) //方法二，利用公式
{
for(int x=0;x<img_rgb->width;x++)
{ //獲取每個影象的畫素,然後用公式轉換
imgy =0.257*cvGetReal2D(r_img_rgb,y,x)+0.504*cvGetReal2D(g_img_rgb,y,x)+0.098*cvGetReal2D(b_img_rgb,y,x)+16;
imgcb=-0.148*cvGetReal2D(r_img_rgb,y,x)-0.291*cvGetReal2D(g_img_rgb,y,x)+0.439*cvGetReal2D(b_img_rgb,y,x)+128;
imgcr=0.439*cvGetReal2D(r_img_rgb,y,x)-0.368*cvGetReal2D(g_img_rgb,y,x)-0.071*cvGetReal2D(b_img_rgb,y,x)+128;
cvSetReal2D(img_y,y,x,imgy);
cvSetReal2D(img_cb,y,x,imgcb);
cvSetReal2D(img_cr,y,x,imgcr);
}
}
cvMerge(img_y,img_cb,img_cr,NULL,ycbcr);//生成Ycbcr顏色空間
//把Ycbcr顏色空間再轉換成RGB顏色空間
int imgr,imgg,imgb;
IplImage* r_rgb=cvCreateImage(cvGetSize(ycbcr),8,1);
IplImage* g_rgb=cvCreateImage(cvGetSize(ycbcr),8,1);
IplImage* b_rgb=cvCreateImage(cvGetSize(ycbcr),8,1);
IplImage* rgb=cvCreateImage(cvGetSize(ycbcr),8,3);
for(int y=0;y<ycbcr->height;y++)
{
for(int x=0;x<ycbcr->width;x++)
{
imgr=1.164*(cvGetReal2D(img_y,y,x)-16)+1.596*(cvGetReal2D(img_cr,y,x)-128);
imgg=1.164*(cvGetReal2D(img_y,y,x)-16)-0.392*(cvGetReal2D(img_cb,y,x)-128)-0.813*(cvGetReal2D(img_cr,y,x)-128);
imgb=1.164*(cvGetReal2D(img_y,y,x)-16)+2.017*(cvGetReal2D(img_cb,y,x)-128);
cvSetReal2D(r_rgb,y,x,imgr);
cvSetReal2D(g_rgb,y,x,imgg);
cvSetReal2D( b_rgb,y,x,imgb);
}
}
cvMerge(r_rgb,g_rgb,b_rgb,NULL,rgb);//把Ycbcr轉換成RGB空間
cvNamedWindow("ycbcr",CV_WINDOW_AUTOSIZE);
cvNamedWindow("ycb",CV_WINDOW_AUTOSIZE);
cvNamedWindow("y",CV_WINDOW_AUTOSIZE);
cvNamedWindow("cb",CV_WINDOW_AUTOSIZE);
cvNamedWindow("cr",CV_WINDOW_AUTOSIZE);
cvNamedWindow("rgb",CV_WINDOW_AUTOSIZE);
cvShowImage("ycbcr",ycbcr);
cvShowImage("y",img_y);
cvShowImage("cb",img_cb);
cvShowImage("cr",img_cr);
cvShowImage("ycb",ycb);
cvShowImage("rgb",rgb);
cvWaitKey();
cvDestroyWindow("ycbcr");
cvDestroyWindow("cb");
cvDestroyWindow("cr");
cvDestroyWindow("ycb");
cvDestroyWindow("rgb");
cvReleaseImage(&ycbcr);
cvDestroyWindow("y");
cvReleaseImage(&img_y);
cvReleaseImage(&img_cb);
cvReleaseImage(&img_cr);
cvReleaseImage(&ycb);
cvReleaseImage(&rgb);
return 0;
}
#include "highgui.h"
#include "cv.h"
#include "cxcore.h"
#include "stdio.h"
int _tmain(int argc, _TCHAR* argv[])
{
float imgy,imgcb,imgcr;
IplImage* img_rgb=cvLoadImage("lena.jpg");
IplImage* ycbcr=cvCreateImage(cvGetSize(img_rgb),8,3);
IplImage* r_img_rgb=cvCreateImage(cvGetSize(img_rgb),8,1);
IplImage* g_img_rgb=cvCreateImage(cvGetSize(img_rgb),8,1);
IplImage* b_img_rgb=cvCreateImage(cvGetSize(img_rgb),8,1);
IplImage* ycb=cvCreateImage(cvGetSize(img_rgb),8,3);
cvCvtColor(img_rgb,ycb,CV_BGR2YCrCb); //方法一，利用opencv內部函式實現
cvSplit(img_rgb,r_img_rgb,g_img_rgb,b_img_rgb,0);//把RGB三通道分為單通道
IplImage* img_y = cvCreateImage (cvSize (img_rgb->width,img_rgb->height),IPL_DEPTH_8U, 1);
IplImage* img_cb= cvCreateImage (cvSize (img_rgb->width,img_rgb->height),IPL_DEPTH_8U, 1);
IplImage* img_cr= cvCreateImage (cvSize (img_rgb->width,img_rgb->height),IPL_DEPTH_8U, 1);
for(int y=0;y<img_rgb->height;y++) //方法二，利用公式
{
for(int x=0;x<img_rgb->width;x++)
{ //獲取每個影象的畫素,然後用公式轉換
imgy =0.257*cvGetReal2D(r_img_rgb,y,x)+0.504*cvGetReal2D(g_img_rgb,y,x)+0.098*cvGetReal2D(b_img_rgb,y,x)+16;
imgcb=-0.148*cvGetReal2D(r_img_rgb,y,x)-0.291*cvGetReal2D(g_img_rgb,y,x)+0.439*cvGetReal2D(b_img_rgb,y,x)+128;
imgcr=0.439*cvGetReal2D(r_img_rgb,y,x)-0.368*cvGetReal2D(g_img_rgb,y,x)-0.071*cvGetReal2D(b_img_rgb,y,x)+128;
cvSetReal2D(img_y,y,x,imgy);
cvSetReal2D(img_cb,y,x,imgcb);
cvSetReal2D(img_cr,y,x,imgcr);
}
}
cvMerge(img_y,img_cb,img_cr,NULL,ycbcr);//生成Ycbcr顏色空間
//把Ycbcr顏色空間再轉換成RGB顏色空間
int imgr,imgg,imgb;
IplImage* r_rgb=cvCreateImage(cvGetSize(ycbcr),8,1);
IplImage* g_rgb=cvCreateImage(cvGetSize(ycbcr),8,1);
IplImage* b_rgb=cvCreateImage(cvGetSize(ycbcr),8,1);
IplImage* rgb=cvCreateImage(cvGetSize(ycbcr),8,3);
for(int y=0;y<ycbcr->height;y++)
{
for(int x=0;x<ycbcr->width;x++)
{
imgr=1.164*(cvGetReal2D(img_y,y,x)-16)+1.596*(cvGetReal2D(img_cr,y,x)-128);
imgg=1.164*(cvGetReal2D(img_y,y,x)-16)-0.392*(cvGetReal2D(img_cb,y,x)-128)-0.813*(cvGetReal2D(img_cr,y,x)-128);
imgb=1.164*(cvGetReal2D(img_y,y,x)-16)+2.017*(cvGetReal2D(img_cb,y,x)-128);
cvSetReal2D(r_rgb,y,x,imgr);
cvSetReal2D(g_rgb,y,x,imgg);
cvSetReal2D( b_rgb,y,x,imgb);
}
}
cvMerge(r_rgb,g_rgb,b_rgb,NULL,rgb);//把Ycbcr轉換成RGB空間
cvNamedWindow("ycbcr",CV_WINDOW_AUTOSIZE);
cvNamedWindow("ycb",CV_WINDOW_AUTOSIZE);
cvNamedWindow("y",CV_WINDOW_AUTOSIZE);
cvNamedWindow("cb",CV_WINDOW_AUTOSIZE);
cvNamedWindow("cr",CV_WINDOW_AUTOSIZE);
cvNamedWindow("rgb",CV_WINDOW_AUTOSIZE);
cvShowImage("ycbcr",ycbcr);
cvShowImage("y",img_y);
cvShowImage("cb",img_cb);
cvShowImage("cr",img_cr);
cvShowImage("ycb",ycb);
cvShowImage("rgb",rgb);
cvWaitKey();
cvDestroyWindow("ycbcr");
cvDestroyWindow("cb");
cvDestroyWindow("cr");
cvDestroyWindow("ycb");
cvDestroyWindow("rgb");
cvReleaseImage(&ycbcr);
cvDestroyWindow("y");
cvReleaseImage(&img_y);
cvReleaseImage(&img_cb);
cvReleaseImage(&img_cr);
cvReleaseImage(&ycb);
cvReleaseImage(&rgb);
return 0;
}