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== Bidirectional reflectance distribution function == | |||
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= Bidirectional reflectance distribution function = | |||
{{Q|The '''bidirectional reflectance distribution function''' ('''BRDF''') is a function of four real variables that defines how light is reflected at an [[w:Opacity (optics)|opaque]] surface. It is employed in the [[w:optics|optics]] of real-world light, in [[w:computer graphics|computer graphics]] algorithms, and in [[w:computer vision|computer vision]] algorithms.|Wikipedia|[[w:bidirectional reflectance distribution function|BRDF]]}} | {{Q|The '''bidirectional reflectance distribution function''' ('''BRDF''') is a function of four real variables that defines how light is reflected at an [[w:Opacity (optics)|opaque]] surface. It is employed in the [[w:optics|optics]] of real-world light, in [[w:computer graphics|computer graphics]] algorithms, and in [[w:computer vision|computer vision]] algorithms.|Wikipedia|[[w:bidirectional reflectance distribution function|BRDF]]}} | ||
A BRDF model is a 7 dimensional model containing geometry, textures and reflectance of the subject. | A BRDF model is a 7 dimensional model containing geometry, textures and reflectance of the subject. | ||
The seven dimensions of the BRDF | The seven dimensions of the BRDF are as follows: | ||
* 3 cartesian X,Y,Z | * 3 cartesian X,Y,Z | ||
* 2 for the entry angle | * 2 for the entry angle | ||
* 2 for the exit angle of the light. | * 2 for the exit angle of the light. | ||
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= | == Covert modeling == | ||
= Covert modeling = | |||
'''Covert modeling''' refers to both covertly modeling aspects of a subject i.e. without express consent. | '''Covert modeling''' refers to both covertly modeling aspects of a subject i.e. without express consent. | ||
Main known cases are | Main known cases are | ||
* Covertly modeling the | * Covertly modeling the human appearance into 7-dimensional [[#Bidirectional reflectance distribution function|]] model or other type of model. | ||
* Covertly modeling the | * Covertly modeling the human voice | ||
There is work ongoing to model e.g. | 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. | ||
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= | == Light stage == | ||
[[File:ESPER_LightCage.jpg|thumb|right|300px|The ESPER LightCage - 3D face scanning rig is a modern [[w:light stage|light stage]]]] | |||
{{Q|A '''[[w:light stage|light stage]]''' or '''light cage''' is equipment used for [[w:3D modeling|shape]], [[w:texture mapping|texture]], reflectance and [[w:motion capture|motion capture]] often with [[w:structured light|structured light]] and a [[w:multi-camera setup|multi-camera setup]].|Wikipedia|light stages}} | |||
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