Image analysis – Color image processing – Color correction
Patent
1996-08-02
1997-09-09
Rogers, Scott A.
Image analysis
Color image processing
Color correction
358518, 358525, H04N 160
Patent
active
056664370
ABSTRACT:
An apparatus for routing interpolator input data for a color space conversion from a RGB color space to a CMYK color space includes a selective two's complementer coupled to a hardware interpolator. The inputs to the selective two's complementer include three sets of four lower order bits, RL, GL, and BL of a twenty four bit RGB color space value and three least significant bits of three sets of four higher order bits, RH, GH, and BH. The inputs to the hardware interpolator include three outputs from the selective two's complementer and eight inputs for receiving interpolator input data from eight memory banks. The interpolation process can be regarded as determining a location within a cube of a cubic lattice formed from vertices represented by the interpolator input data values. The interpolator input data values are classified into one of eight classes based upon the evenness and oddness of the components of the vector formed from the three sets of higher order bits specifying the location of the corresponding vertex within the cubic lattice. Each of the eight memory banks stores one of the eight classes of interpolator input data values. The eight interpolator input data values corresponding to any cube within the cubic lattice are stored in the eight memory banks. To perform the interpolation, the eight interpolator input data values must be routed to computational blocks within the interpolator depending upon the evenness and oddness classification of each of the three sets of higher order bits corresponding to the interpolator input data value. By performing a two's complement on those sets of lower order bits corresponding to those sets of higher order bits classified as odd, the routing of the interpolator input data values is accomplished mathematically in the corresponding computational blocks.
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Hewlett--Packard Company
Rogers Scott A.
Wisdom Gregg W.
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