Describe the BRDF, its advantage over Lambertian, and critical CV tasks
Tests 4D view-dependent reflectance. Strong answers define BRDF as dL_r/dE_i (sr^-1) over four angles; note Lambertian is isotropic; cite photometric stereo and shape-from-shading where specularity breaks the model. Red flag: calling it albedo.
Tests deep understanding of why reflectance is a four-dimensional function of incoming and outgoing light directions. A strong answer defines BRDF as reflected radiance over incident irradiance (units sr^-1), notes that Lambertian is the special isotropic case where BRDF is constant, and names tasks like photometric stereo and shape-from-shading where assuming Lambertian fails under specular highlights or grazing angles because observed intensity depends on viewer direction. Red flag: conflating BRDF with a texture map or scalar albedo.
Read the original → Wikipedia: Bidirectional reflectance distribution function
- #computer vision
- #graphics
- #brdf
- #photometric stereo
- #reflectance
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