Question

What does it mean when smile liveness returns a score of 0 in some cases? 

Answer

Smile liveness is returning a score of 0 because the smile and neutral images are incorrect. The most likely scenario is that the person is not smiling enough. The DIS algorithm evaluates the difference between neutral and smiling faces. In some cases, the difference is too small, resulting in a score of 0. There is an internal threshold parameter in the application.yml file that defines the required level of difference. The default value is 0.2, but this can be adjusted.

innovatrics:

    dot:

        dis:

        internal:

            smile-liveness:

        face-expressions-difference-threshold: 0.2

Relevant Product / Version

DIS server

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