Apparatus for generating interpolator input data

Details Apparatus for generating interpolator input data Apparatus for generating interpolator input data

1996-08-02

1998-02-10

Coles, Sr., Edward L.

Facsimile and static presentation processing

Natural color facsimile

Interpolation

358518, H04N 146

Patent

active

057175071

ABSTRACT:
An apparatus for generating interpolator input data for a color space conversion from a RGB color space to a CMYK color space includes an address generator having eight outputs and a memory having eight inputs each connected to one of the address generator outputs. The inputs to the address generator are the three sets of four higher order bits, RH, GH, and BH, of the twenty four bit RGB color space value and two bits for selecting one of the dimensions in the CMYK space to which the conversion will be directed. From these inputs, the address generator can generate 19,652 addresses for accessing interpolator input data stored in the memory. The address generator simultaneously generates eight addresses for accessing interpolator input data stored in the memory. The memory is divided into eight memory banks with the interpolator input data assigned to the eight memory banks so that for any RGB color space input value, the eight values used for interpolation in the conversion to one dimension of the CMYK color space can be simultaneously accessed in the memory. The apparatus for generating interpolator input data uses a look-up table expanded from 4096 to 4913 interpolation values for each of the dimensions of the CMYK color space. The look-up table for all four dimensions of the CMYK color space is stored in a memory having a capacity of 19,652 bytes partitioned into eight memory banks ranging in size from 2048 bytes to 2916 bytes. By using the expanded look-up table, interpolator input data can be generated for the case in which the input RGB color space value lies on the outer boundary of the RGB color space.

REFERENCES:
patent: 3893166 (1975-07-01), Pugsley
patent: 4275413 (1981-06-01), Sakamoto et al.
patent: 4477833 (1984-10-01), Clark et al.
patent: 4511989 (1985-04-01), Sakamoto
patent: 5121196 (1992-06-01), Hung
patent: 5208872 (1993-05-01), Fisher
patent: 5313314 (1994-05-01), Ikegami
patent: 5337166 (1994-08-01), Ikegami
Kasson et al; Performing Color Space Conversions With Three-Dimensional Linear Interpolation; Jul. 1995.
Stone et al; Color Gamut Mapping And The Printing Of Digital Color Images; Oct. 1988.
Kanamori et al; A Novel Color Transformation Algorithm And Its Applications; 1990 Feb. 1990.
191546-1 Jan. 18, 1995 Jones.
Hung; Color Rendition Using Three-Dimensional Interpolation; 1988 Jan. 1988.
Hung; Colorimetric Calibration In Electronic Imaging Devices Using A Look-Up-Table Model And Interpolations; Jan. 1993.
Booktree Corporation; RGB To CMYK Color Space Conversion Considerations; Apr. 1990.
Paeth; Algorithms For Fast Color Correction; 1989.
Kanamori et al; Fast Color Processor With Programmable Interpolation By Small Memory (PRISM); Jul. 1993.
Gennetten, RGB to CMYK Conversion Using 3D-Barycentric Interpolation; Jun. 1993.

Affiliated with

Also associated with

Rating

Apparatus for generating interpolator input data does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus for generating interpolator input data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for generating interpolator input data will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2081586