Apparatus for correction of color signal values

Details Apparatus for correction of color signal values Apparatus for correction of color signal values

1991-05-16

1993-08-31

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358518, 358 29, H04N 964, H04N 146

Patent

active

052413730

ABSTRACT:
A color value correction apparatus for converting each of successive combinations of input tricolor digital values into an output color value in accordance with predetermined data stored in memory, includes three table memories which store values which are respective differences between color values corresponding to vertices of unit tetrahedra in a color space and a reference color value that is common to all of a set of tetrahedra forming one of an array of unit cubes or parallelepipeds which constitute that color space, and also includes a table memory that stores these reference color values. To obtain an interpolated output value, each of these memories is addressed three-dimensionally by the high-order bits of an input tricolor value combination to thereby specify one of the unit cubes or parallelepipeds, and the difference value memories are in addition addressed by a value, derived from the low-order bits of the input value combination, specifying a specific tetrahedron containing the interpolation point. An interpolated output value can thereby be obtained by executing only three multiplication operations followed by addition operations.

REFERENCES:
patent: 4275413 (1981-06-01), Sakamoto et al.
patent: 4907076 (1990-03-01), Ohsawa

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