estimate_sl_al_lr ( Image : : : Slant, Albedo )

Estimate the slant of a light source and the ambedo of a surface.

estimate_sl_al_lr estimates the Slant of a light source, i.e., the angle of the light source and the positive z-axis, and the ambedo of the surface in the input image Image, i.e., the percentage of light reflected by the surface, using the algorithm of Lee und Rosenfeld.


Attention

The Albedo is assumed constant for the entire surface depicted in the image.


Parameters

Image (input_object)
image(-array) -> object
Image for which slant and albedo are to be estimated.

Slant (output_control)
angle.deg(-array) -> real
Angle of the light sources and the positive z-axis (in degrees).

Albedo (output_control)
real(-array) -> real
Amount of light reflected by the surface.


Result

estimate_sl_al_lr always returns the value TRUE.


Possible Successors

sfs_mod_lr, sfs_orig_lr, sfs_pentland, phot_stereo, shade_height_field



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