How to detect Triange and Hexagone?

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Anybody please tell the algorithm to detect the Triangle and Hexagone shapes in pictures

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Image Analyst
Image Analyst on 31 Dec 2013
Depends on what the picture looks like. If it's just a picture of a random snapshot of a city scene, then it could be difficult. If you already have the binary image, it's a lot easier. Maybe try corner() in the Image Processing Toolbox, or, depending on how perfect the shapes are you could call regionprops() and look at the Perimeter^2/(4*pi*area) ratio, which will be different for the two shapes.
Image Analyst
Image Analyst on 31 Dec 2013
Alright, so try regionprops.

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