Question

我有RGB大图像和RGB小图像。用较小的图像替换较大图像中的区域的最快方法是什么？我可以定义多渠道ROI然后使用copyTo吗？或者我必须将每个图像分割成通道，替换ROI然后再将它们重新组合成一个？

Answer 1

是。多渠道ROI和copyTo将起作用。类似的东西：

int main(int argc,char** argv[])
{
    cv::Mat src = cv::imread("c:/src.jpg");

    //create a canvas with 10 pixels extra in each dim. Set all pixels to yellow.
    cv::Mat canvas(src.rows + 20, src.cols + 20, CV_8UC3, cv::Scalar(0, 255, 255));

    //create an ROI that will map to the location we want to copy the image into
    cv::Rect roi(10, 10, src.cols, src.rows);
    //initialize the ROI in the canvas. canvasROI now points to the location we want to copy to.
    cv::Mat canvasROI(canvas(roi));

    //perform the copy.
    src.copyTo(canvasROI);

    cv::namedWindow("original", 256);
    cv::namedWindow("canvas", 256);

    cv::imshow("original", src);
    cv::imshow("canvas", canvas);

    cv::waitKey();  

}

在openCV中，如何替换图像中的RGB ROI

1 个答案: