OpenCV复制断言错误 [英] OpenCV copyTo assert error

问题描述

在将一个Mat复制到另一个Mat的感兴趣区域时，我遇到了一个从未见过的错误.谷歌搜索并没有得到很多结果，而且似乎都没有意义.

While copying one Mat into the region of interest of another I came accross an error I've never seen before. Googling it didn't turn up many results and none of them seems to be relevant.

我提供了错误的屏幕截图以及Mat的一些属性.

I have included a screenshot of the error as well as some properties of the Mat's.

这是代码:

    std::cout << "size height,width: " << size.height << ", " << size.width << std::endl;
    cv::Mat tempResult(size.width, size.height, result.type());

    std::cout << "tempResult cols,rows: " << tempResult.cols << ", " << tempResult.rows << std::endl;
    std::cout << "tempResult type: " << tempResult.type() << std::endl;
    std::cout << "tempResult channels: " << tempResult.channels() << std::endl;

    std::cout << "result cols,rows: " << result.cols << ", " << result.rows << std::endl;
    std::cout << "result type: " << result.type() << std::endl;
    std::cout << "result channels: " << result.channels() << std::endl;

    cv::Rect rect(0, 0, result.cols-1, result.rows-1);

    std::cout << "rect size: " << rect.size() << std::endl;
    result.copyTo(tempResult(rect));

推荐答案

cv::Mat::operator(cv::Rect roi)方法提取与cv :: Rect roi大小相同的子矩阵. 但是，您定义了一个cv :: Rect对象，其中缺少1行和1个col，因此tempResult(rect)返回的输出矩阵小于矩阵result. cv::Mat::CopyTo启动异常，因为要复制的输入小于输出参数.

The cv::Mat::operator(cv::Rect roi) method extract a submatrix with the same size of the cv::Rect roi. But you defined a cv::Rect object with 1 row and 1 col missing, so the output matrix returned by tempResult(rect) is smaller the the matrix result. cv::Mat::CopyTo launch an exception because the input to copy is smaller than the output argument.

要解决此问题:

cv::Rect rect(0, 0, result.cols, result.rows);

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