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Glossary: Difference between revisions
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= Ban Covert Modeling! wiki glossary = | |||
== Bidirectional reflectance distribution function == | == Bidirectional reflectance distribution function == | ||
[[File:BRDF_Diagram.svg|thumb|right|300px|Diagram showing vectors used to define the [[w:BRDF|BRDF]].]] | [[File:BRDF_Diagram.svg|thumb|right|300px|Diagram showing vectors used to define the [[w:BRDF|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]]}} | {{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 are as follows: | The seven dimensions of the BRDF model are as follows: | ||
* 3 cartesian X,Y,Z | * 3 cartesian X,Y,Z | ||
* 2 for the entry angle | * 2 for the entry angle | ||
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Main known cases are | 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 appearance''' into 7-dimensional [[#Bidirectional reflectance distribution function|]] model or other type of model. | ||
* Covertly modeling the human voice | * 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. | 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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== Deepfake == | == Deepfake == | ||