Algorithm for determining the illumination of an object from a photograph?

Question

Image processing

Tell me,
is there an algorithm for determining the illumination of an object from a photograph?
The task is this: there is a photograph of the object, you need a determinant of what its illumination was at the time of shooting.

Answer 1

Does not exist.
Formulate the task more clearly.
Roughly: we have an object with albedo A, illuminated by flux F. The object is flat, oriented normally to the camera. The light source is located "in the chamber". The distance to the object is known. The parameters of the light receiver are known (i.e. it is calibrated). The parameters of optics, exposure time, etc. are known. Here in this case, you can estimate the value of F.
Google a little about absolute photometry. You are, in fact, exactly what you need.

Answer 2

Exif to help you! )))