Synonyms
Definition
Reflectance models are analytic functions specifying the ratio of reflected radiance to irradiance at a point.
Background
Whether for recognition or image synthesis, it is frequently necessary to have a model for how much light a surface will reflect. Though a surface may reflect a different amount of light at each position, the bidirectional reflectance distribution function (BRDF) embodies the reflectance at a single point, for every possible angle of incident and exitant light. It is defined [1] as the ratio of reflected radiance in a direction ωo to irradiance from direction ωi:
Note that this equation is defined in terms of irradiance, which implicitly includes the famous “cosine...
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References
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Rusinkiewicz, S. (2014). Reflectance Models. In: Ikeuchi, K. (eds) Computer Vision. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-31439-6_537
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DOI: https://doi.org/10.1007/978-0-387-31439-6_537
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