recompile OpenCV for Android on Windows

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Hello, first of all thank you for this great image processing library! Currently I use the precompiled "libopencv_java.so" library for that. Since this file is a bit over 8MB and i only use "core" and "imgproc" funktionality, I thought i could recompile those two to reduce the size of my app a bit. It's my first time trying to compile a library and it's kind of overwhelming. I found a few NDK tutorials but neither worked for me so far. Is there a tutorial on how to compile only a small part of the library on windows to use in an android Projekt?