Glossary: Difference between revisions
Juho Kunsola (talk | contribs) (Sourced definition of w:deepfake to a {{Q}}) |
Juho Kunsola (talk | contribs) m (tweaks) |
||
| Line 1: | Line 1: | ||
= 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 | ||
| Line 16: | Line 20: | ||
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. | ||
---- | ---- | ||
== Deepfake == | == Deepfake == | ||
Revision as of 12:09, 3 April 2019
Ban Covert Modeling! wiki glossary
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.”
A BRDF model is a 7 dimensional model containing geometry, textures and reflectance of the subject.
The seven dimensions of the BRDF model 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.
Deepfake
“Deepfake (a portmanteau of "deep learning" and "fake") is a technique for human image synthesis based on artificial intelligence. It is used to combine and superimpose existing images and videos onto source images or videos using a machine learning technique called a "generative adversarial network" (GAN).”
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.”