Opencv4Android KCFTracker grayscale

asked 2018-02-19 23:07:12 -0600

Hello guys, right now I am facing a problem where grayscale image will causes assertion error in KCFTracker. The problem is probably caused by KCFTracker default params is CN where my image is GRAY. In C++ I can create a KCFTracker object with KCFTracker::Params but I am unable to find a way to set this params in Opencv4Android.

OpenCV Error: Assertion failed (img.channels() == 3) in bool cv::TrackerKCFImpl::getSubWindow(cv::Mat, cv::Rect, cv::Mat&, cv::Mat&, cv::TrackerKCF::MODE)

answered 2018-02-20 04:26:04 -0600

berak
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yes, KCF is using ColorNames features (that's the CN flag) by default, which needs color images. and no, no way to set the params from java.

please update your opencv libs to latest master, to have it fixed

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Thanks for your very helpful reply! Seems like my libs(v331) is too outdated. However, when I tried to compile the latest opencv with the contrib modules, it compiled successfully but install/sdk/java is missing. I did try to compile the v331 again and it compiles successfully without problem. I didn't change any steps between compiling these 2 versions.

changsheng1239 ( 2018-02-22 06:26:39 -0600 )edit

"but install/sdk/java is missing" -- check again, if cmake finds the ant tool. see if java shows up in the "to be built" section of the cmake output.

if you can't get it done, please ask a new question, and add the cmake output.

berak ( 2018-02-22 06:45:50 -0600 )edit

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