feedback algorithm without additional amplification (simulation)

          The feedback was simulated with K=1 (see p.5).
Edwin H. Land's mondrian under “white” illumination Edwin H. Land's mondrian under “dim” illumination Edwin H. Land's mondrian under “yellow” illumination Uniform gray surface under “yellow” illumination
Discounting the illumination is made in a proper direction but not at full potential: output images are tinted by the illuminant color.
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