Pico transplant to Android. Use Android's camera to detect human faces by using Pico.Details in the project/app/src/main/jni/.cpp
References:
[1] https://github.com/nenadmarkus/pico
[2] Markuš N, Frljak M, Pandžić I S, et al.Object detection with pixel intensity comparisons organized in decisiontrees[J]. arXiv preprint arXiv:1305.4537, 2013.