farimarwat/Document-Scanner ? reverse-engineered prompt

Build me an Android document scanner SDK that feels like a simple CamScanner style tool.

I want the app or library to let users open the camera, detect a paper document or book page, crop it cleanly, remove shadows, improve the colors, sharpen blurry text, and create a black and white version too. It should also include a nice filter that makes scanned pages look clean and readable.

Please add a camera helper that shows the scan frame and automatically gives me the cropped front and back image. I also want an image editor where someone can add a signature, type text, or draw on the page with their finger.

If it makes sense, include basic PDF support for opening a PDF, converting images to PDF, and simple page editing. Make it easy to plug into a normal Android project, and keep the scan quality high. If you need to check current Android docs online while building it, go ahead.