Detection of shape boundary dynamically like ( (business card) Rectangle , square and Circle) from the camera?

[mahmooddagga]

I would like to get some help if possible . I'm trying to detect business card using my Android phone camera but I don't know where to start. so i can Extracting text from image using OCR and process it to read business card..

[salmangadit]

I've already implemented something like this on Android. Check project here: https://github.com/salmangadit/scope

[rmtheis]

Try OpenCV