EP0313789B1 - Procédé et appareil pour l'affichage de données des couleurs à trois dimensions dans un système de référence à une dimension - Google Patents
Procédé et appareil pour l'affichage de données des couleurs à trois dimensions dans un système de référence à une dimension Download PDFInfo
- Publication number
- EP0313789B1 EP0313789B1 EP19880115124 EP88115124A EP0313789B1 EP 0313789 B1 EP0313789 B1 EP 0313789B1 EP 19880115124 EP19880115124 EP 19880115124 EP 88115124 A EP88115124 A EP 88115124A EP 0313789 B1 EP0313789 B1 EP 0313789B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- color
- data
- dimensional
- index
- component
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
- G09G5/06—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed using colour palettes, e.g. look-up tables
Definitions
- This invention relates generally to the display of color images on a computer terminal and, more particularly, to a method and an apparatus capable of processing, storing and referencing data representing image color, defined in the preamble part of patent claims 1 and 2, respectively.
- image color data are stored as R,G,B (red, green, blue) color component values in predetermined memory locations.
- red values are stored in one group of memory locations, green values in another, and blue values in a third group.
- the user usually specifies a color number or index.
- the index which represents a single (one-dimensional) address, permits access to the particular set of RGB values representing the selected color.
- RGB color values themselves (rather than color numbers or indexes) to represent a selected color.
- the "color values” approach is representative of the true color system--a three-dimensional color referencing system.
- the "color number” approach is representative of the index color system--a one-dimensional color referencing system.
- True color systems are generally used to produce shaded images, to display scanned-in images, and to simulate physical phenomena such as colored lights illuminating a scene composed of colored objects.
- Indexed color systems are generally used to depict color of icon symbols, to represent scalar values, or to distinguish image segments (e.g., primitives such as points, lines, arcs, circles, rectangles, polygons, and text).
- the document US-A-4,509,043 discloses an apparatus for representing three-component color data in a single-index reference system, comprising processing means responsive to applied data representing information of the color components and memory means coupled to said processing means.
- the known apparatus is directed for independently displaying one of a plurality of images on a display and for super imposing the plurality of images onto one another to produce a composite image.
- a color map is built up in said memory containing a plurality of brightness indices which determines the image brightness. Associated with each index is one or more color indices.
- the bits associated with each pixel of the image are used as an index to the color map by locating the corresponding color or grey indices.
- Index color operations and true color operations are performed in an index color environment.
- the apparatus computes one-dimensional index-type data from user-supplied three-dimensional true color data.
- the user specifies the number of color levels to be used in representing the range of displayable red, green and blue colors, and specifies the RGB values of the color to be displayed.
- the apparatus derives true color data (RGB color level values) from the number of color levels specified by the user, stores the derived data in memory in a predetermined arrangement suitable for referencing by a single address or index, and derives from the user-specified RGB values a single address for referencing the stored data.
- the apparatus comprises a keyboard and a port to a host computer for inputting index color data and true color data, a processing means coupled to the keyboard and/or host computer for producing index-type data from true color data, a memory means for storing the input data and data produced by the processing means, and a display means for displaying stored data.
- Fig. 1 shows a system of the prior art capable of performing index color operations.
- Fig. 2 shows a color map memory of the system, RGB data typically stored in the memory, and a one-dimensional (single color index) address scheme for referencing stored data.
- Fig. 3 shows a three-dimensional address scheme of the prior art for referencing stored data. From user-supplied RGB values stored in image memory, references are made to color values stored in three look-up tables (LUTs).
- Fig. 2 shows a one address (index) scheme, while Fig. 3 shows a three address (true color) scheme.
- Fig. 4 shows a true-color one-address scheme, the scheme utilized by the apparatus of the present invention.
- the apparatus of the present invention is capable of performing index color operations.
- the apparatus is capable of performing true color operations in an index color environment.
- the apparatus comprises a keyboard 10 and port to a host computer for inputting index color data and true color data, a processing means 11 coupled to the keyboard and/or host computer for producing index-type data from true color data, a memory means 13 for storing the input data and data produced by the processing means, and a display means 15 for displaying stored data.
- the processing means 11 includes a microprocessor 12 having a ROM (read only memory, not shown) with a stored program, and a vector generator 18.
- the memory means 13 includes a memory 14 for storing index information, a video display memory 20, and a color map memory 22.
- the display means 15 includes a video timing and control circuit 16, and a CRT (cathode ray tube) display with associated deflection circuit and D to A (digital-to-analog) converter.
- the apparatus of the present invention is much like the system described in U.S. patent US-A-4,509,043 for performing index operations, and the description of that system applies as well to the present apparatus.
- the processor and color map memory of the present apparatus are designed to operate differently from said system, as described below.
- Fig. 5 shows color map memory 22 of the present apparatus in greater detail.
- the RGB values are arranged in tabular form in memory, with each memory location containing one set of R,G,and B values addressable by a single address.
- the RGB values in the tables are calculated (derived) by the apparatus from data supplied to the apparatus. The calculation is performed by processor 12 under control of the stored program. (Examples of the stored program are presented in Appendixes A and B.)
- the single address used to reference the RGB values in the table is derived by processor 12 of the apparatus from RGB values specified by the user.
- both the RGB table values and the single address for referencing the RGB table values are derived by the apparatus.
- the initial user of the apparatus specifies the RGB color values to be used in populating the table, by uniformly quantizing the closed interval from zero to one for each color.
- the user may specify the number of the displayable levels to be Q (i.e., Q discrete quantization levels of red, green, and blue displayable primary colors).
- the apparatus calculates the actual table entries (i.e., the true-color RGB values which, when referenced subsequently by a single index-type address, produces the original user-specified values).
- one set of displayable primary color levels may be:
- the five quantization levels occupy the range from 0% to 100% of displayable red, green, and blue primary colors.
- the range of displayable colors may be viewed as a three-dimensional color space, where (0,0,0) represents black, i.e., 0% red, 0% green, 0% blue, (1,0,0) represents 100% red, (0,1,0) represents 100% green, (0,0,1) represents 100% blue, and (1,1,1) represents white, i.e., 100% red, 100% green and 100% blue.
- the user of the apparatus may select:
- the apparatus calculates the color values (table entries) and populates the RGB tables as follows:
- RGB tables show color data produced (derived) by processor 12 in response to user-specified quantization levels.
- Processor 12 stores the derived data in memory 22 in a predetermined sequence (arrangement), as shown in Table II below.
- the address 86 would be derived by processor 12, permitting access to the correct RGB values in the table.
- the method includes the steps of deriving true color data (i.e., RGB color level values) from the number of color levels specified by the user, storing the derived data in memory in a predetermined arrangement suitable for referencing by a single address or index, and deriving from user-supplied RGB color values a single address for referencing the stored data.
- true color data i.e., RGB color level values
- Appendix A shows RGB values, and associated single index addresses, derived for:
- Appendix B shows RGB values, and associated single index addresses, derived for:
- index and true color data are shown for both a single index surface (surface 1) and a true color surface (surface 2).
- surface 1 index surface
- surface 2 true color surface
- the "00” represents a color index for surface 1
- the "01 10 11 represents RGB color values for surface 2.
- the address was computed (derived) from user-supplied index and true color values. The address is used to reference the RGB values "01010101 1010101011111111".
- the RGB values may differ for a given address. For example, given the computed address "01 11 11 11”, if the RGB values "10000000 10000000 10000000” had been predetermined to represent the color index "01”, and the RGB values "11111111 11111111 11111111 had been predetermined to represent the RGB color level "11 11 11”, then the RGB values "10000000 10000000 10000000” would be used if the indexed color surface had priority, and the RGB values "11111111 11111111 11111111 " would be used if the true color surface had priority.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Image Generation (AREA)
- Controls And Circuits For Display Device (AREA)
- Digital Computer Display Output (AREA)
Claims (6)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11303087A | 1987-10-26 | 1987-10-26 | |
US113030 | 1987-10-26 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0313789A1 EP0313789A1 (fr) | 1989-05-03 |
EP0313789B1 true EP0313789B1 (fr) | 1992-11-25 |
Family
ID=22347223
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19880115124 Expired - Lifetime EP0313789B1 (fr) | 1987-10-26 | 1988-09-15 | Procédé et appareil pour l'affichage de données des couleurs à trois dimensions dans un système de référence à une dimension |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0313789B1 (fr) |
JP (1) | JPH01147497A (fr) |
DE (1) | DE3876212T2 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0422296B1 (fr) * | 1989-10-12 | 1995-01-11 | International Business Machines Corporation | Système d'affichage avec mode de couleur directe |
JPH05505086A (ja) * | 1990-12-11 | 1993-07-29 | イーストマン・コダック・カンパニー | デジタル・データ処理装置 |
JP3133779B2 (ja) * | 1991-06-14 | 2001-02-13 | キヤノン株式会社 | 画像処理装置 |
US5579409A (en) * | 1991-09-27 | 1996-11-26 | E. I. Du Pont De Nemours And Company | Methods for determining the exterior points of an object in a background |
US5448652A (en) * | 1991-09-27 | 1995-09-05 | E. I. Du Pont De Nemours And Company | Adaptive display system |
GB0420461D0 (en) * | 2004-09-14 | 2004-10-20 | Bremer Trainor Michael | Colour system |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4509043A (en) * | 1982-04-12 | 1985-04-02 | Tektronix, Inc. | Method and apparatus for displaying images |
JPS5960488A (ja) * | 1982-09-29 | 1984-04-06 | フアナツク株式会社 | カラ−グラフイツクメモリのデ−タ書き込み装置 |
US4578673A (en) * | 1983-07-08 | 1986-03-25 | Franklin Computer Corporation | Video color generator circuit for computer |
JPS60230693A (ja) * | 1984-04-27 | 1985-11-16 | インタ−ナショナル ビジネス マシ−ンズ コ−ポレ−ション | カラ−画像表示システム |
JPS60252394A (ja) * | 1984-05-22 | 1985-12-13 | インタ−ナショナル ビジネス マシ−ンズ コ−ポレ−ション | カラ−画像表示装置 |
JPS62151894A (ja) * | 1985-12-26 | 1987-07-06 | 富士通株式会社 | カラ−多階調表示装置 |
-
1988
- 1988-09-15 DE DE19883876212 patent/DE3876212T2/de not_active Expired - Fee Related
- 1988-09-15 EP EP19880115124 patent/EP0313789B1/fr not_active Expired - Lifetime
- 1988-10-24 JP JP63267993A patent/JPH01147497A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
DE3876212D1 (de) | 1993-01-07 |
JPH01147497A (ja) | 1989-06-09 |
DE3876212T2 (de) | 1993-06-17 |
EP0313789A1 (fr) | 1989-05-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5233684A (en) | Method and apparatus for mapping a digital color image from a first color space to a second color space | |
US5068644A (en) | Color graphics system | |
US5003299A (en) | Method for building a color look-up table | |
US5546105A (en) | Graphic system for displaying images in gray-scale | |
US5343311A (en) | Indexed processing of color image data | |
EP0384879B1 (fr) | Appareil et méthode pour sélectionner une couleur | |
US5172423A (en) | Methods and apparatus for defining contours in colored images | |
US5181014A (en) | Method and apparatus for representing three-dimensional color data in a one-dimensional reference system | |
US5412491A (en) | Apparatus and method for color transformation | |
US5734369A (en) | Method and apparatus for dithering images in a digital display system | |
US5473737A (en) | Method and apparatus for displaying a composite image made up of a foreground image and a background image | |
US6766051B2 (en) | Adaptive tree-base lookup for non-separably divided color tables | |
US5327509A (en) | Compressed image system for texture patterns | |
US5485558A (en) | Method and system for displaying color on a computer output device using dithering techniques | |
US5870077A (en) | Method for tristimulus color data non-linear storage, retrieval, and interpolation | |
WO2001041049A1 (fr) | Systeme et procede de traitement rapide d'images informatiques a l'aide de tables de reference des couleurs | |
US5666436A (en) | Method and apparatus for transforming a source image to an output image | |
CA1241780A (fr) | Terminal d'affichage graphique et methode de stockage de donnees alphanumeriques dans celui-ci | |
US6650337B2 (en) | Increasing color accuracy | |
US5247589A (en) | Method for encoding color images | |
EP0313789B1 (fr) | Procédé et appareil pour l'affichage de données des couleurs à trois dimensions dans un système de référence à une dimension | |
US20030234810A1 (en) | Graphical user interface for color correction using curves | |
US5786907A (en) | High speed color compensation system | |
EP0533712B1 (fr) | Transformation en temps reel entre des espaces colores | |
US6002795A (en) | Method and apparatus for transforming a source image to an output image |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB NL |
|
17P | Request for examination filed |
Effective date: 19890503 |
|
17Q | First examination report despatched |
Effective date: 19910610 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR GB NL |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY Effective date: 19921125 |
|
ET | Fr: translation filed | ||
REF | Corresponds to: |
Ref document number: 3876212 Country of ref document: DE Date of ref document: 19930107 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19940401 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee | ||
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19960820 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19960824 Year of fee payment: 9 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19970915 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19970915 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19980603 |