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D-Alex / ropencv

ffi ruby wrapper for opencv
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findContours hierarchy #36

Closed Arhno closed 8 years ago

Arhno commented 8 years ago

When using the findContours function, the returned hierarchy is a row matrix with as many columns as contours.

Based on the documentation of OpenCV, the hierarchy should be n x 4 where n is the number of contours. I expected the type of the hierarchy to be Std::vector::Cv_Vec4i.

In the current situation, the hierarchy variable is useless.

Arhno commented 8 years ago

Turns out the issue wasn't with findContours but with me not getting how to access a multi-channels matrix.

Translating Mat#at from C++ #8 helped me in that respect.

Thank you for the work you've done with this binding