How to detect Triange and Hexagone?

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

Answer 1

[Image Analyst]

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.

[saravanakumar D]

I have binary image contain some Triangles,square,circle and Hexagone. What i have to do?

[Image Analyst]

Look at the circularity ratio like I suggested. If you need help with regionprops, see my tutorial at http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862. It will show you how to measure things like area, etc. Just change the image to your image and try it.

[saravanakumar D]

I have binary image. May i go with corner() function to detect the Hexagone and Triangle?

[Image Analyst]

That's one way to do it. I'd probably go with regionprops because it's easier but whatever works....

[saravanakumar D]

Corner() function didn't work for me. It just returns and 200 points on the boundries of the Triangle. It just show the points on corner.

[Image Analyst]

Alright, so try regionprops.