How can I retrieve data embedded in an image with steganography? I want to know is there any way to retrieve data embedded in a steganalised image by just scanning the image with mobile scanner? Just like qr code scanning
In general, you can't.

The reason is this: the data might be encrypted on a way what makes it indistinguishable from random noise. Actually, any good quality encryption does it so.

Thus, if you try to separate any possibly steganographically hidden data, you have no way to know, if it is really random noise, or it is encrypted, but worthy content.

It might be possible if the hidden data is not encrypted on some reason (for example, for better data safety).