speed up on android

[qq297110281]

@rockkingjy great project! i try to make work on android recently. and it work ok, but the speed not so good, here is my setting:
parameters.useDeepFeature = false;
parameters.useHogFeature = true;
parameters.useColorspaceFeature = false;
parameters.useCnFeature = true;
parameters.useIcFeature = true;
parameters.learning_rate = 0.01;
parameters.projection_reg = 5e-7;
parameters.init_CG_iter = 10 * 20;
parameters.CG_forgetting_rate = 60;
parameters.precond_reg_param = 0.2;
parameters.reg_window_edge = 4e-3;
parameters.use_scale_filter = false;
parameters.hog_features.fparams.cell_size=12;
parameters.cn_features.fparams.cell_size = 10;
parameters.ic_features.fparams.cell_size = 10;

the compile options:
set (CMAKE_BUILD_TYPE Release)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -frtti -fexceptions -fopenmp -mfpu=neon -mfloat-abi=softfp -O3 -ffast-math -DUSE_SIMD -DUSE_NEON -pthread -DUSE_MULTI_THREAD")

and the input image resolution is : 384x216
i got average 70ms per frame. any advise??