The current ownCloud Android app has different options to upload files to an ownCloud server, such as selecting them from the internal storage, selecting content from other apps and uploading photos directly from the camera.
It would be great to include a new option which enables the user to take a new picture with the camera and select the edges of handwritten notes or printed documents. After that, the image will be processed, adjusted to a better view and uploaded to a folder on the server.
It’s not necessary to write the code of that from scratch, third-party libraries can be used with attributions if needed.