(Forked from https://github.com/jhansireddy/AndroidScannerDemo/ to extract/publish the library with very minor changes)

ScanLibrary

ScanLibrary is an android document scanning library built on top of OpenCV, using the app you will be able to select the exact edges and crop the document accordingly from the selected 4 edges and change the perspective transformation of the cropped image.

Screenshots

Videos

Using it in your project

• If you are using android studio, add the dependency to your main app build.gradle this way:

compile project(':scanlibrary')

• In your activity or fragment when you want to give an option of document scanning to user then: Start the scanlibrary ScanActivity, with this the app will go to library, below is the sample code snippet: Note: preference can be one of OPEN_CAMERA or OPEN_MEDIA or left empty, based on the passed preference the scan library decides to open camera or media or open the scan home page.

       int REQUEST_CODE = 99;
       int preference = ScanConstants.OPEN_CAMERA;
       Intent intent = new Intent(this, ScanActivity.class);
       intent.putExtra(ScanConstants.OPEN_INTENT_PREFERENCE, preference);
       startActivityForResult(intent, REQUEST_CODE);

• Once the scanning is done, the application is returned from scan library to main app, to retrieve the scanned image, add onActivityResult in your activity or fragment from where you have started startActivityForResult, below is the sample code snippet:

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_CODE && resultCode == Activity.RESULT_OK) {
            Uri uri = data.getExtras().getParcelable(ScanConstants.SCANNED_RESULT);
            Bitmap bitmap = null;
            try {
                bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), uri);
                getContentResolver().delete(uri, null, null);
                scannedImageView.setImageBitmap(bitmap);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

License

Copyright (c) 2016 Jhansi Karee

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

• IMPORTANT: This project uses the OPENCV Framework. Download the newest version here 'http://opencv.org/.