I want to detect hand drawn basic shapes - rectangles, ellipses, triangles etc.
Does anybody have an idea how to implement this?
I want to detect hand drawn basic shapes - rectangles, ellipses, triangles etc.
Does anybody have an idea how to implement this?
Maybe you can try the OpenCV library. Actually this library has the focus of computer vision, i.e. analyzing pixeldata of images and video and might be too heavy for your task. But on the other hand it is very powerfull and available on many plattforms (even on iOS). And a hand drawn image with shapes is also just a set of pixels, isn't it ;-)
You might have a look at the manual:
http://www.sciweavers.org/books/opencv-open-source-computer-vision-reference-manual
There is plenty of information about OpenCV here on stackoverflow as well. Some hints on stackoverflow are here:
DETECT the Edge of a Document in iPhoneSDK
and here