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2015-04-02 10:38:24 -0500 asked a question matcher func of FlannBasedMatcher would raise exception or be a bug

My developement environmen is 2012 and opencv 2411.In following code if value of descriptors_2.rows equal 0 It will raise exception.I wonder whether it was a bug?

FlannBasedMatcher matcher;
std::vector< DMatch > matches;
matcher.match( descriptors_1, descriptors_2, matches );

2015-03-27 10:48:14 -0500 asked a question cvAddWeighted cvConvert problem

Hi everyone!THere are some error in following code.The errors information in the second picture.Thks in advance! image description image description