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I am a new learner of opencv,now I want to deal some picture like some card,I want to find its edge,I notice that the bottom edge's bottom is black and its top is white,does opencv has a way to find edge like this?

zyznull
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    you should show what efforts you have tried to resolve the problem and what is the result and where you think the problem is. – Hasson Dec 25 '17 at 13:58

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OpenCV can help you find edges using Canny Edge Detector You can refer for the implementation in this link

OpenCV's Canny Edge Detection in C++

Furthermore, I would like you to first do a bit of research on your own before actually asking for questions here.

Akshay Bahadur
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  • Thank you.But the canny will find all edge.I only want to find some special edge which's top is white and its bottom is black. – zyznull Jan 05 '18 at 00:28