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EP0413483A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

A display system

Assignee: International Business Machines Corp
•
Filing: 1990-08-03
•
Granted: —
•
Expires: 2010-08-03
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Abstract

Abstract A display system is described that allows the rapid display of colour images on screen, and removes the need for extensive image pre-processing prior to display on screen. A universal palette is utilised, divided into several sub-palettes, each one containing data pertaining to shades of different, individual colours. For example, in a palette with an 8 bit address, 64 shades each of red, green, blue and grey could be stored. Source colour data are supplied to logic which selects a particular colour component's data, and this data is then utilised to address the sub-palette containing data pertaining to shades of that particular colour. For example, red source data are utilised to address the section of the palette (sub-palette), containing data yielding red colour shades. Pixels are grouped on screen to form a macro-pixel, each pixel of the macro-pixel being devoted to one particular colour shade. The eye then acts to merge these colour pixels on screen to form the composite colour of the macro-pixel. In an alternative embodiment, all of the source colour data are used to address the palette. Overall contouring of the image on screen is removed without the need for extensive image pre-processing, thus allowing the rapid display of guality images on screen.

Inventors

  • 👤 Dan Shmuel Chevion
  • 👤 Eugeniusz Walach
  • 👤 Ittai Gilat

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-03 07:02
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/02; G09G5/06

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 85 words
A display system comprising a bit map for storing source data for an image pixel, a palette containing data for controlling pixel colour on screen, logic for addressing the palette, wherein the palette is a universal palette divided into sub-palettes, at least one sub-palette containing data for controlling pixel colour for display anywhere on screen (4), said data corresponding to shades of dominantly one colour, wherein the data within said sub-palette are addressed via an index generated from an associated portion of the source data.
Claim 2
Dependent Claim 85 words
A display system comprising a bit map for storing source data for an image pixel, a palette containing data for controlling pixel colour on screen, logic for addressing the palette, wherein the palette is a universal palette divided into sub-palettes, at least one sub-palette containing data for controlling pixel colour for display anywhere on screen (4), said data corresponding to shades of dominantly one colour, wherein the data within said sub-palette are addressed via an index generated from an associated portion of the source data.
Claim 3
Dependent Claim 51 words
A display system as claimed in Claim 1, in which image pixels are grouped to form a macro-pixel (M), wherein the portion of source data utilised to generate the index to address a sub-palette and the sub-palette addressed are dependent on the position of the image pixel within the macro-pixel (M).
Claim 4
Dependent Claim 26 words
A display system as claimed in either of the preceding claims, wherein the source data includes red (r), green (g) and blue (b) colour component data.
Claim 5
Dependent Claim 57 words
A display system as claimed in any of the preceding claims, wherein the palette is divided into a first, a second, a third and a fourth sub-palette, the first sub-palette for storing red colour data, the second for storing green colour data, the third for storing blue colour data, and the fourth for storing grey colour data.
Claim 6
Dependent Claim 78 words
A display system as claimed in claim 4 when dependent on claim 3, including logic (1) for selecting colour component data to be supplied to index generation logic (2) such that the red colour component source data is utilised to address the sub-palette storing dominantly red colour data, blue colour component source data to address the sub-palette storing dominantly blue colour data and the green colour component source data to address the sub-palette storing dominantly green colour data.
Claim 7
Dependent Claim 22 words
A display system as claimed in Claim 1, in which all source data are utilised to generate the index to the sub-palette.
Claim 8
Dependent Claim 15 words
A display system as claimed in Claim 6 wherein the sub-palette contains grey colour data.
Claim 9
Dependent Claim 21 words
A display system as claimed in any of the preceding claims, wherein the colour data stored within a sub-palette are desaturated.
Claim 10
Independent Claim 50 words
A method for processing image pixel data wherein a palette is divided into sub-palettes, at least one sub-palette containing data for controlling pixel colour anywhere on screen, said data corresponding to shades of dominantly one colour, wherein the sub-palette is accessed by an associated portion of image pixel source data.
Claim 11
Independent Claim 50 words
A method for processing image pixel data wherein a palette is divided into sub-palettes, at least one sub-palette containing data for controlling pixel colour anywhere on screen, said data corresponding to shades of dominantly one colour, wherein the sub-palette is accessed by an associated portion of image pixel source data.
Claim 12
Dependent Claim 37 words
A method as claimed in Claim 7, in which the portion of the source data utilised to address a sub-palette, and the sub-palette addressed, are dependent on the position of the image pixel when displayed on screen.

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