matlab - How do I binarize Fisher Vectors? -

i'm working on school project and, between many tasks, need binarize fisher vectors following written in this paper. given vl_feat library use matlab , implementd simple tutorial return fisher vectors given features.

everything works fine , updated vl_fisher function raise each dimension of fisher vector power of value α ∈ [0, 1] stated in section 4.1. α = 0 can have fisher vector values {-1,0,1} ternary encosing.

the second part of section 4.1 explains how turn ternary encoding equivalent binary encoding. got little lost in there, due fact i'm using library return fisher vector representation. representation consists of vector of doubles , makes trickier follow paper description.

so question is, how binarize fisher vectors vl_feat library on matlab ? have binarize ternary encoding ? should compute fisher vectors in way make them more suitable following binarization ?

thanks in advance time!

there 2 possible solutions problem:

1. you put hand on open source library code , make return need
2. you implement own way binarize fisher vectors

i ended following second step in matlab instead of putting hands on c library. keep in mind this article useful when comes compute gmm in log domain. i'll release implementation open source i'm done project.