Size of APK file when using OpenCV

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Hi, I'm using Open CV in my project. OpenCV works fine for me but customer complains about APK size. Adding OpenCV into project added about 3.5MB to APK size. I can't use OpenCV manager because of business reasons so I statically includes OpenCV into my project.

Is there any chance to build something like OpenCV Lite with just a subset of OpenCV functionality? I need only reading and writing of PNG files and threshold functionality.

Thanks for any advice Tom