OpenCV学习笔记8_ShowROI_显示感兴趣区域

ShowROI_显示感兴趣区域

ShowROI.c  用复制替换图层，替换出自己感兴趣的ROI

#include "stdafx.h"

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

int main()
{
    IplImage* img;
    img = cvLoadImage("E:\\TempDataForDebug\\tomato1.jpg");
    IplImage* sub_image = cvLoadImage("E:\\TempDataForDebug\\bee.jpg");
    
    CvRect rect;
    rect.x = 400;
    rect.y = 23;
    rect.width = sub_image->width;
    rect.height = sub_image->height;

    cvSetImageROI(img, rect);
    cvCopy(sub_image, img);

    cvResetImageROI(img);

 　　cvNamedWindow("sub");
    cvShowImage("sub",sub_image);

 　　cvNamedWindow("1");
 　　cvShowImage("1",img); 

 　　cvWaitKey(0);
　　 return 0;
 }

ShowROI.c  改进版，用指针偏移，像素替换

#include "stdafx.h"

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

int main()
{
    IplImage* img;
    img = cvLoadImage("E:\\TempDataForDebug\\tomato1.jpg");
    IplImage* sub_image = cvLoadImage("E:\\TempDataForDebug\\bee.jpg");
    
    CvRect rect;
    rect.x = 400;
    rect.y = 23;
    rect.width = sub_image->width;
    rect.height = sub_image->height;

    int y,x;

    for (y = 0; y<sub_image->height; y++)
    {
        unsigned char* subImgData = (unsigned char*)(sub_image->imageData+y*sub_image->widthStep);
        unsigned char* bigImgData = (unsigned char*)(img->imageData+(y+rect.y)*img->widthStep);

        for (x = 0; x<sub_image->width; x++)
        {
            bigImgData[3*(x+rect.x) + 0] = subImgData[3*x + 0];
            bigImgData[3*(x+rect.x) + 1] = subImgData[3*x + 1];
            bigImgData[3*(x+rect.x) + 2] = subImgData[3*x + 2];
        }
    }
    cvNamedWindow("sub");
    cvShowImage("sub",sub_image);

    cvNamedWindow("1");
    cvShowImage("1",img);

    cvWaitKey(0);

    return 0;
}