Glossary

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    Bidirectional reflectance distribution function

    “The bidirectional reflectance distribution function (BRDF) is a function of four real variables that defines how light is reflected at an opaque surface. It is employed in the optics of real-world light, in computer graphics algorithms, and in computer vision algorithms.”

    ~ Wikipedia on BRDF


    A BRDF model is a 7 dimensional model containing geometry, textures and reflectance of the subject.

    The seven dimensions of the BRDF are as follows:

    • 3 cartesian X,Y,Z
    • 2 for the entry angle
    • 2 for the exit angle of the light.

    Covert modeling

    Covert modeling refers to both covertly modeling aspects of a subject i.e. without express consent.

    Main known cases are

    • Covertly modeling the human appearance into 7-dimensional [[#Bidirectional reflectance distribution function|]] model or other type of model.
    • Covertly modeling the human voice

    There is work ongoing to model e.g. human's style of writing, but this is probably not as drastic a threat as the covert modeling of appearance and of voice.


    Light stage

    The ESPER LightCage - 3D face scanning rig is a modern light stage

    “A light stage or light cage is equipment used for shape, texture, reflectance and motion capture often with structured light and a multi-camera setup.”

    ~ Wikipedia on light stages