Cropping a Perspective Transformation of Image on Android

Question

I\'m trying to do a perspective transform on a bitmap that I capture via the camera. The user adjusts a bounding quad (as depicted by the white box) around a rectangular object.

Answer 1

After you create your new Bitmap image, you can call Android's built in crop functionality by building a 'crop' intent and calling it, example:

Intent cropIntent = new Intent("com.android.camera.action.CROP");

// Put in 'Extras' here to build the intent

// Start the activity. It will be handled by returning data to onActivityResult
startActivityForResult(cropIntent, PIC_CROP); // PIC_CROP is just an arbitrary tag name.

More detail about image cropping in Android can be attained from here.

You will also need to add the following in your app's manifest file for this to work: