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This folder includes:

1. main_feature_extract_optical_flow: extract optical-flow-based
   features 

   1.1 optical_flow_feature: sub-routine under
   main_feature_extract_optical_flow

2. main_feature_extract_silhouette: extract silhouette-based feature

   2.1 video_3D_hor_ver_dis_bounday_single: sub-routine under
   main_feature_extract_silhouette

       2.1.1 hor_ver_dis_boundary_fast: sub-routine under
       video_3D_hor_ver_dis_bounday_single (compute the horizontal,
       vertical and diagonal distance to mask boundaries)

       2.1.2 cov_mask_3D_feature_single: sub-routine under
       video_3D_hor_ver_dis_bounday_single (compute the covariance
       matrix of silhouette-based features)

3. main_L1_norm_OPT: action recognition based on sparse representation
   approach

4. Cov2Vec: vectorize a covariance matrix

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