使用openCv c ++复制图像的一部分 [英] copy a part of image with openCv c++
问题描述
我正在使用opencv，我想从另一个图像的一部分创建一个图像。
I am using opencv and I want to create an image from a part of another image.
我没有找到这样做的功能所以我尝试实现我的想法，包括逐像素复制图像，但是徒劳无功，我没有得到我正在等待的结果。
I didn't find a function that do that so I try to implement my Idea which consist of copying the image pixel by pixel but in vain I didn't get the result I am waiting for.
任何人都有另一个想法
代码：
#include "cv.h"
#include "highgui.h"
#include <stdlib.h>
#include <stdio.h>
#include <iostream>
int main(int argc,char** argv) {
IplImage * img =0;
uchar *data;
int i,j,k;
int height,width,widthStep,nChannels;
img=cvLoadImage(argv[1],3);
height =img->height;
width = img->width;
widthStep= img->widthStep;
nChannels = img->nChannels;
data=(uchar*)img->imageData;
IplImage* img1=cvCreateImage(cvSize(height/2,width/2),IPL_DEPTH_8U,nChannels);
for(i=0;i<height/2;i++){
for(j=0;j<width/2;j++){
for(k=0;k<3;k++){
img1->imageData[i*widthStep+j*nChannels]=data[i*widthStep+j*nChannels];
}
}
}
cvShowImage("image_Originale2",img1);
cvWaitKey(0);
cvReleaseImage(&img);
return 0;
}
推荐答案
你想要完成什么可以通过在该图像上设置 ROI （感兴趣区域）并将ROI定义的部分复制到新图像来完成。
What you are trying to accomplish can be done by setting a ROI (Region of Interest) on that image and copying that portion defined by the ROI to a new image.
您可以使用<$ c $查看演示c> IplImage 在这篇文章中。
You can see a demo using IplImage on this post.
这些帖子显示了使用ROI来解决不同的场景：
These posts show uses of ROI to solve different scenarios:
- MultiCrops in same image
- Setting ROI with mouse from a rectangle on a video
- Put Image in contour (OpenCV)
- IplImage inside IplImage
这很重要请注意您的代码使用的是OpenCV的 C接口。 C ++接口提供 cv :: Mat ，相当于 IplImage 。换句话说，您正在寻找的是问题的 C解决方案。
It's important to note that your code is using the C interface of OpenCV. The C++ interface offers cv::Mat, which is the equivalent of IplImage. In other words, what you are looking for is a C solution to the problem.
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