cvSetImageROI C++ 直接用构造函数解决！

最新推荐文章于 2022-12-01 10:39:44 发布

原创最新推荐文章于 2022-12-01 10:39:44 发布 · 637 阅读

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本文介绍了使用OpenCV进行图像区域（ROI）操作的方法。通过示例代码展示了如何定义ROI并进行图像拷贝、位运算等操作。这些技巧对于图像处理任务非常有用。

cv::Mat image = cv::imread("image_filname");

// SetImageRoi
cv::Rect roi(x, y, width, height);
cv::Mat image_roi = image(roi);

img = imread("image.jpg",  CV_LOAD_IMAGE_COLOR);  

int x = 20, y = 20, width = 50, height = 50;

cv::Rect roi_rect(x,y,width,height);

cv::Mat roi = img(roi_rect);

/* ROI data pointer points to a location in the same memory as img. i.e.
 No separate memory is created for roi data */

cv::Mat complement;
cv::bitwise_not(roi,complement);
complement.copyTo(roi);

cv::imshow("Image",img);
cv::waitKey();

The example you provided can be done as follows:
cv::Mat roi = dst(cv::Rect(0, 0,img1.cols,img1.rows));
img1.copyTo(roi);

 



 

BTW It would be better to write cv::Rect
 roi_rect = cv::Rect(x,y,width,height); as justcv::Rect
 roi_rect(x,y,width,height); 












up vote



The easiest way is usually to use a cv::Rect to specifiy the ROI:
cv::Mat img1(...);
cv::Mat dst(...);
...
cv::Rect roi(0, 0, img1.cols, img1.rows);
img1.copyTo(dst(roi));