在OpenCv中排序cv :: Mat

问题描述

在OpenCV中有一个等价的函数，类似于Matlab中的 [srtd，srtdinds] = sort（dst，'ascend'）; 我试过 cv :: sortIdx（source，dst，cv :: SORT_ASCENDING）; 但它不工作。我的来源 Mat 包含一列。

Is there an equivalent function in OpenCV similar to [srtd,srtdinds] = sort(dst,'ascend'); in Matlab? I have tried cv::sortIdx(source, dst, cv::SORT_ASCENDING); but it doesn't work. My source Mat contains a single column.

推荐答案

：

这意味着你需要调用 cv :: sort（）来调用 cv :: sortIdx（），以便复制Matlab的 sort（）函数：

This means that you will need to call cv::sort() to sort the elements themselves after calling cv::sortIdx() to replicate the behavior of Matlab's sort() function:

cv::Mat source = cv::Mat::eye(3,3,CV_32F), dst;
cv::sortIdx(source, dst, CV_SORT_EVERY_ROW + CV_SORT_ASCENDING);
cv::sort(source, source, CV_SORT_EVERY_ROW + CV_SORT_ASCENDING);

现在 dst 包含置换的索引， source 包含已排序数据本身。

Now dst contains the permuted indices, and source contains the sorted data itself.

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