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Hurlbert Regularization
Test 8A

These images are the result of filtering with a Hurlbert regularization filter, then biasing to gray. A relaxation was then applied, taking into account edges in luminance to constrain the color diffusion within regions belonging to a single surface.

Gamut Illuminant A Illuminant B Illuminant C
All
Little
Blue
Little
Red


The parameters of the filter (h128f5) were:

The windowing function applied to this filter was tailored to preserve the DC response of the filter (i.e. zero.) A Blackman window was used in the previous four or five regularization filters, which coupled with the shape of this filter was producing a quite noticeable DC response...


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