Computes the ISV session offset

This algorithm is a legacy one. The API has changed since its implementation. New versions and forks will need to be updated.
This algorithm is splittable

Algorithms have at least one input and one output. All algorithm endpoints are organized in groups. Groups are used by the platform to indicate which inputs and outputs are synchronized together. The first group is automatically synchronized with the channel defined by the block in which the algorithm is deployed.

Group: main

Endpoint Name Data Format Nature
statistics tutorial/gmm_statistics/1 Input
isv_offset system/array_1d_floats/1 Output

Unnamed group

Endpoint Name Data Format Nature
ubm tutorial/gmm/1 Input
isvbase tutorial/isvbase/1 Input

The code for this algorithm in Python
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Given a feature vector, a GMM and a U subspace, computes the session offset (xi, j).

Specific details can be found in [McCool2013].

This algorithm relies on the Bob library.

The inputs are:

  • statistics: A set of GMM Statistics of a probe.
  • ubm: A GMM corresponding to the Universal Background Model.
  • isvbase: The subspace_u and subspace_d for the session and the client offset respectivelly.

The output, isv_offset, is the latent variable xi, j ( Eq. (29) in [McCool2013]) that corresponds to the session offset.

[McCool2013](1, 2) McCool, Christopher, et al. "Session variability modelling for face authentication." IET biometrics 2.3 (2013): 117-129.

Experiments

Updated Name Databases/Protocols Analyzers
smarcel/tutorial/full_isv/2/mobio_male-gmm_100Gx10I-isv_50Ux10Ix4R-dct_12Bx8Ox45C-seed101 mobio/1@male tutorial/eerhter_postperf_iso/1
tutorial/tutorial/full_isv/2/bancaMc_isv_DCT12x8_100G_U50 banca/1@Mc tutorial/eerhter_postperf_iso/1
tutorial/tutorial/full_isv/2/xm2vtsLp1_isv_DCT12x8_100G_U50 xm2vts/1@lp1 tutorial/eerhter_postperf_iso/1
tutorial/tutorial/full_isv/2/mobioMale_isv_DCT12x8_100G_U50 mobio/1@male tutorial/eerhter_postperf_iso/1
tutorial/tutorial/full_isv/2/bancaP_isv_DCT12x8_100G_U50 banca/1@P tutorial/eerhter_postperf_iso/1
tutorial/tutorial/full_isv/2/atnt_isv_DCT12x8_100G_U50 atnt/1@idiap_test_eyepos tutorial/eerhter_postperf_iso/1

This table shows the number of times this algorithm has been successfully run using the given environment. Note this does not provide sufficient information to evaluate if the algorithm will run when submitted to different conditions.

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