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Definition
Lambertian reflectance is a scene property that distributes the energy from any incident illumination into all viewing directions equally.
Background
Local reflectance can be defined by the four-dimensional bidirectional reflectance distribution function (BRDF), where the four dimensions are the angles for viewing direction and incident illumination. Lambertian reflectance has no dependency on viewing direction and is therefore a two-dimensional function. This simplicity has made it popular, but like all local models, it does not account for cast shadows or specularities. The Lambertian model is widely used due to both its computational tractability and its fidelity to many scenes, especially when the captured image data is of low resolution. Finally, the Lambertian model is an example of diffuse reflectance, which means it acts as a low-pass filter to incident illumination [1]....
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Koppal, S.J. (2021). Lambertian Reflectance. In: Computer Vision. Springer, Cham. https://doi.org/10.1007/978-3-030-03243-2_534-1
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DOI: https://doi.org/10.1007/978-3-030-03243-2_534-1
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