I am trying to develop a visual cryptography android application. The idea is that a user can take a photo of a share which just looks like a rectangle of black and white dots. The application should then be able to overlay a second image of a share on the one found in the picture taken through the camera to reveal a secret.
I currently have an application that takes a picture and is able to overlay a second share on top of that picture but I cant tell if that picture contains a share in the first place how can I identify and find the location of a share in a image.
Is there a way to alter a open source qr scanner for my purpose as a QR code an a visual cryptography share look similar?
An example of visual cryptography shares can be found here:
http://upload.wikimedia.org/wikipedia/commons/0/0e/Visual_crypto_animation_demo.gif
