Hi,
For shape detection, we must do two things.
1. Create database of ur all shapes in .MAT file.
2. Decide way of detection.
We have two options for that.
1. Using eigen values of the database and captured images we can find out the shape.
2. Using inbuilt function corr2 we can get the detected shape.
After the shape has been detected than we can convert it into binary, gray scale, histogram etc. as per the requirements.