Processing system with dynamic alteration of a color look-up table
US5926647A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1996 |
| Grant date | Jul 20, 1999 |
| Priority date | — |
| Expiry date | Oct 11, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/64307
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for dynamic alteration of a color look-up table (CLUT) pallet identifier in response to one or more key codes placed in an input data stream. An input data stream including a sequence of input data blocks is converted into a stream suitable for addressing a look-up table. The look-up table may be a 256.times.16 table which requires an 8-bit address to identify a particular table entry. The invention allows such a table to be addressed using 4-bit data blocks in the input data stream. For each received 4-bit data block in the input data stream, a determination is made as to whether that block corresponds to a predetermined key value. If a given input block does not correspond to the predetermined key value, the 4-bit input block is combined with a previously-stored 4-bit pallet identifier to generate an 8-bit address into the look-up table. The pallet identifier specifies one of 16 different 16-entry pallets within the 256.times.16 look-up table. If the given input block does correspond to the key value, a new 4-bit pallet identifier is stored. The new pallet identifier may be contained within a data block which immediately follows the key value block in the d…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.