OpenCV学习笔记7_ImageToBGR_彩色图像三通道转化成BGR3幅单通道图像

ImageToBGR_彩色图像三通道转化成BGR3幅单通道图像

ImageToBGR.c  采用指针偏移

#include "stdafx.h"

#include "cv.h"
#include "highgui.h"
#include "cxcore.h"

int main()
{
    IplImage* img;
    img = cvLoadImage("E:\\TempDataForDebug\\tomato.jpg");

    IplImage* b_img;
    IplImage* g_img;
    IplImage* r_img;

    b_img = cvCreateImage(cvGetSize(img),IPL_DEPTH_8U,1);
    g_img = cvCreateImage(cvGetSize(img),IPL_DEPTH_8U,1);
    r_img = cvCreateImage(cvGetSize(img),IPL_DEPTH_8U,1);


    int y,x;

    for (y = 0; y<img->height; y++)
    {
        unsigned char* prow = (unsigned char*)(img->imageData+y*img->widthStep);
        unsigned char* brow = (unsigned char*)(b_img->imageData+y*b_img->widthStep);
        unsigned char* grow = (unsigned char*)(g_img->imageData+y*g_img->widthStep);
        unsigned char* rrow = (unsigned char*)(r_img->imageData+y*r_img->widthStep);

        for (x = 0; x<img->width; x++)
        {
            brow[x] = prow[3*x + 0];
            grow[x] = prow[3*x + 1];
            rrow[x] = prow[3*x + 2];
        }
    }
    cvNamedWindow("1");
    cvShowImage("1",img);

    cvNamedWindow("b");
    cvShowImage("b",b_img);
    cvNamedWindow("g");
    cvShowImage("g",g_img);
    cvNamedWindow("r");
    cvShowImage("r",r_img);

    cvWaitKey(0);

    return 0;
}