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Shape from shading: the problem

The only source of information here is the image irradiance equation that ties intensity to the reflectance map :

This is a 1st-order PDE with two unknowns: and .

The reflectance map R depends on surface orientation , illumination, and surface reflectance properties.

R can be derived analytically from known , or measured empirically, with a calibration object.

Must make assumptions to solve the image irradiance equation.

Edelman Shimon
Wed Oct 18 09:18:18 EDT 1995