OpenCV cv :: Mat设置是否 [英] OpenCV cv::Mat set if

问题描述

是否有一种简单的方法可以将cv :: Mat中的所有值设置为给定值(如果它们满足某些条件).例如，我有CV_32FC1，我想将所有值设置为0到20.在MATLAB中，我可以简单地做到这一点:

Is there a simple way to set all values in a cv::Mat to a given value if they fulfill some condition. For instance, I have CV_32FC1, and I want set all values which are 0 to 20. In MATLAB I would have simply done this:

M(M == 0) = 20;

推荐答案

您可以使用

cv::Mat mask = M == 0;
M.setTo(0.5, mask);

但是，它包括使用额外的内存来创建掩码，但这是使用opencv API的解决方案，因此可以应用于所有矩阵类型.如果考虑性能问题，则始终可以直接参考Mat :: data以针对具体矩阵类型优化此解决方案.

However, it includes using additional memory for creating mask, but is a solution using opencv API therefore can be applied to all matrix types. If you consider performance issues, you can always refer directly to Mat::data to optimize this solution for concrete matrix type.

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