GB2167926A - Colour signal generator for crt image display - Google Patents
Colour signal generator for crt image display Download PDFInfo
- Publication number
- GB2167926A GB2167926A GB08429801A GB8429801A GB2167926A GB 2167926 A GB2167926 A GB 2167926A GB 08429801 A GB08429801 A GB 08429801A GB 8429801 A GB8429801 A GB 8429801A GB 2167926 A GB2167926 A GB 2167926A
- Authority
- GB
- United Kingdom
- Prior art keywords
- colour
- memory
- memory locations
- signal generator
- address
- 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.)
- Withdrawn
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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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Controls And Circuits For Display Device (AREA)
- Processing Of Color Television Signals (AREA)
- Digital Computer Display Output (AREA)
Abstract
A colour signal generator has a colour memory 1 (CLUT) which comprises at least two separate sections M1 and M2. The section M1 contains colour reference data for a standard range of colours which can be allocated to pixels of a bit-map display on a CRT display image 7. The section M2 contains colour reference data for different intensity versions of the standard range of colours. In operation, a bit word representing the colour of each pixel addresses memory locations in both the sections which store M1 and M2 colour reference data for the relevant colour. A select circuit 11 determines which of the two colour reference data choices is to be used under the control of a processor 8. <IMAGE>
Description
1
GB 2 167 926A 1
SPECIFICATION Colour signal generator
5 The invention relates to an electronic colour signal generator for a colour image display system, which generator comprises a memory having addressable memory locations for storing colour reference data, addressing means 10 connected to an address input of the memory for generating address words for selectively addressing the memory locations, each address word being generated under control of a received first digital signal representing at 15 least one element of an image to be displayed, and reading means connected to a data output of the memory for outputting the colour reference data from the selected memory locations.
20 Prior GB patent specification GB 2 032 740 A describes a colour signal generator of the above type in which the stored colour reference data identifies different colours of varying hue, saturation and intensity. These three 25 terms as used in this prior patent specification, and as will be so used in the present specification, have their standard dictionary meanings. Thus, "hue" means the attribute of colours that permits them to be classified as 30 red, green, blue, or an intermediate between any contiguous pair of these three colours, and relates to the dominant wavelengths of a colour. "Saturation" characterises the purity of a colour, that is, the extent to which it is 35 mixed with white. "Intensity" relates to the brightness or luminosity of a colour. For any particular colour, the stored colour reference data is in three separate parts which relate respectively to linear proportions of the three 40 primary colours red, green and blue that are to be added together to produce that particular colour of appropriate hue, saturation and intensity.
However, the colour characteristics of hue, 45 saturation and intensity are not simple functions of the red, green and blue colour proportions, but are extremely inter-dependent and are inter-related by complex mathematical formulae. These relationships are further com-50 plicated by the non-linear response or
"gamma" of a cathode ray tube. Therefore, it has been found that the intensity of many colours is unlikely to be altered by a linear change in the proportions of red, green and 55 blue colours which are used additively to produce them, without also changing the hue and saturation of these colours.
This inability to alter independently the intensity of a colour without also affecting its 60 hue and saturation poses a problem in image display on the screen of a display device. For instance, where a coloured portion of a displayed image is increased in intensity to highlight that portion, undesirable change in the 65 hue and/or saturation of the coloured portion can result. Also, where a coloured portion of a displayed image is reduced in intensity (e.g. to provide a window for the display of subtitles), undesirable change in the hue and/or saturation of that coloured portion can again result.
With a view to overcoming this problem, prior USA patent specification 4 183 046 describes a colour signal generator of the type set forth above in which the words of the first digital signal are in three separate groups of data bits which define the colours of elements of an image to be displayed in terms of intensity, hue and saturation. The data bit groups corresponding to hue and saturation are employed for simultaneously addressing the memory which contains colour reference data representing the dimensions of hue and saturation only. This data is read out as a second digital signal for conversion by digital-to-analogue conversion means into analogue signals which serve as red, green and blue video signals for driving a 3-gun colour cathode ray tube to form on the screen thereof the image represented by the first digital signal. The data bit group which corresponds to intensity is applied to the digital-to-analogue conversion means to modulate the magnitude of the red, green and blue video signals. This permits intensity to be altered without also altering hue and/or saturation.
It is an object of the present invention to provide a simpler solution to the above-mentioned problem.
According to the present invention, a colour signal generator of the type set forth above is characterised in that said memory comprises a number (N^2) of sets of memory locations each having an equal storage capacity, each set comprising data for different intensities of each colour of a plurality of different colours, said colour signal generator further comprising selection means for selecting under control of a received intensity indication a corresponding set of memory locations out of said number for rendering effective said address words only in respect of that corresponding set of memory locations.
The pluralisation of the colour reference data in a colour signal generator in accordance with the present invention permits the colour reference data for a standard range of colours to be stored in one set of memory locations of the memory, and colour reference data for higher and/or lower intensity versions of the standard range of colours to be stored in another set or sets of memory locations of the memory. The advantage of this generator over the prior art generators discussed previously is that it enables a simple and flexible translation of any colour in the standard range of colours into the same colour having a different intensity.
The colour reference data for the different intensity version(s) of standard colours can be
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pre-determined completely arbitrarily, for instance by using a processor with an interactive software program by which a user can edit stored colour reference data by viewing 5 the resulting displayed colours. The colour reference data for the standard colours can be created in one section of a random access memory and then continually modified and stored in another section or sections of the 10 random access memory until the user is satisfied with the resulting displayed colour(s) of the different intensity version(s).
By this means, not only will the non-linearities of a colour cathode ray tube and the 15 complex relationships between the colour characteristics of hue, saturation and intensity be taken into account, but also the human perception to colour can be taken into account.
20 In carrying out the invention, the colour signal generator can be arranged so that said selection means comprises a select circuit for generating an additional address word under control of said intensity indication, said select 25 circuit having an output connected to said addressing means for supplying said additional address word thereto, said addressing means being appropriate for forming composite address words for addressing memory locations 30 by adding said additional address word to the address words.
This offers a simple realisation of the addressing means and the selection means. Alternatively, in carrying out the invention, 35 the memory can be composed of a number of sections which contain a respective one of the two or more sets of memory locations, with corresponding memory locations in the different sets being addressable in common by the 40 same word in the first digital signal, and said selection means can comprise a select circuit for generating under control of said intensity indication a select signal which enables for read-out the corresponding memory section. 45 The number of sets of memory locations may be two, one set being provided for low intensity colour reference data and the other set for high intensity colour reference data. In order that the invention may be more 50 fully understood reference will now be made by way of example to the accompanying drawing, of which:—
Figure 1 shows a block schematic diagram of a colour signal generator conforming to the 55 invention; and
Figure 2 shows a modification of the colour signal generator shown in Fig. 1.
Referring to the drawing, the colour signal generator shown in Fig. 1 comprises a colour 60 memory 1, a memory addressing circuit 2, a memory read-out circuit 3, three digital-to-analogue converters 4, 5 and 6, a colour cathode ray tube display device 7, a processor 8, an input device 9, a display memory 10, a select 65 circuit 11, and a timing control circuit 12.
For the operation of the colour signal generator, data representing an image for display is received from the input device 9 and fed into the display memory 10 for storage therein under the control of the processor 8. The input device 9 can be, for instance, an electronic writing tablet for creating static colour pictures and other graphics displays on the screen of the display device 7. The created display is in bit-map form and may be composed, for instance, of a matrix of 512X512 picture elements (pixels). The colour of each pixel of an image display is stored as a multi-bit word in the display memory 10, which is a random access memory. It is assumed for the purposes of discussion that each pixel can have any one of sixteen different colours, so that each pixel is then represented by a respective 4-bit word in the display memory 10.
The display device 7 is controlled by means of line and field synchronising signals LS and FS to effect conventional refresh raster scanning (with or without field interlacing) for producing the image display. In synchronism with the raster scan, the 4-bit words which define the colours for the pixels of the image display are read out from the display memoy 10. The four bits of each word are read out serially on a lead 13 for application to the memory addressing circuit 2 as a first digital signal 1DS. The circuit 2 latches the four bits of each received word in turn and applies them in parallel to the first four leads a1 to a4 of a group of five memory address leads a1 to a5. The remaining address lead a5 receives a logic '0' or ' 1' bit from the select circuit 11, as will be described.
The colour memory 1 is also a random access memory and serves as a colour look-up table (CLUT). The colour memory 1 has a first set M1 of sixteen memory locations which can be addressed selectively by respective '0' and ' 1' bit combinations of the 4-bit words on the address leads a1 to a4, in conjunction with a bit of value '0' on the address lead a5. The colour memory 1 also has a second set M2 of sixteen memory locations which can be addressed selectively by the same respective '0' and '1' bit combinations of the 4-bit words on the address leads a1 to a4, in conjunction with a bit of value '1' on the address lead a5. Each of the memory locations of each set is assumed to have a storage capacity for a 12-bit word which represents colour reference data. Thus, a selection of sixteen different 12-bit words from a possible total of 4096 (~4K) 12-bit words can be stored in each set of sixteen memory locations. When a memory location is addressed, the bits of the 12-bit word stored therein are read-out serially on a lead 14 as a second digital signal 2DS and latched into the memory read-out circuit 3. The bits of the latched word are then applied- in three 4-bit groups to the digital-to-analogue converters 4,5 and 6, respectively,
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GB 2 167 926A 3
over three groups of address leads aR, aG and aB. These converters convert the 4-bit groups applied them into respective red, green and blue video signals on leads R,G,B, for 5 driving the colour cathode ray tube display device 7.
The colour reference data stored in the sixteen memory locations of the memory section M1 represent a standard range of 16 different 10 colours. These locations can be addressed by the appropriate 4-bit word on the address leads a1 to a4, as aforesaid. In accordance with the present invention, the colour reference data stored in the sixteen memory loca-15 tions of the memory section M2 represent different (e.g. low) intensity versions of the 16 colours which form the standard range of colours. Each 4-bit word on the leads a1 to a4 also addresses in the memory sections M2 20 the particular memory location containing the different intensity versions of the standard colour that it contained in the memory location which it addresses in the memory section M1. Under the control of the processor 8, the se-25 lect circuit 11 produces either a '0' bit or a '1' bit on the address lead a5, to select either the memory location in the memory section M1 or the memory location in the memory section M2, that are both addressed by the 4-30 bit word on the address leads a1 to a4. The colour reference data is read out from the selected memory location to provide the standard or different colour version, as the case may be, for the pixel concerned in the image 35 display.
The selection among standard or different intensity versions of the colours can be realised either under request of an operator by application of a select signal at said input de-40 vice 9, or under request of an executed program. The processor 8 supplies the coordinates of a display area together with an intensity indication (standard or different intensity) to the select circuit 11. This select circuit 45 which also receives clock signals from the timing control circuit 12 scans with the displayed picture and applies either a "0" bit or a "1" bit on the address lead a5 in accordance with the received intensity indication 50 when said colour memory is addressed for the display of said display area.
A picture displayed on said display device 7 can be divided into, for example, 16 rectangular display areas numbered from 0-15. In this 55 case the processor 8 supplies the number (4 bits) of the display area and the associated intensity indication (1 bit) to the selection circuit.
In another embodiment of the select circuit 60 a content addressable memory is used which is loaded by the processor 8.
When setting-up the generator, the colour reference data in the colour memory 1 would be edited visually on the display device 7 us-65 ing the processor 8 with an inter-active software program. With this program, the bit values of the three 4-bit groups for each colour forming the standard range of colours would first be settled by the user and then stored in the memory locations in the memory sections M1. Following this operation, the different intensity version of each colour would be settled subjectively by the user by altering the bit values of the three 4-bit groups for the colour until a satisfactory result was obtained. The altered bit values of the 4-bit groups for each colour would then be stored in the memory locations in the memory section M2. With this subjective determination of the different intensity versions of the colours the human perception of the eye can be taken into account, along with the non-linearities or "gamma' of the colour cathode ray tube and the complex relationships between the colour dimensions of hue, saturation and intensity.
The timing of the operation of the colour signal generator is under the control of the timing control circuit 12. As aforesaid, the timing control assumes serial read-out from both of the memories 1 and 10. However,
data read-out in parallel from these memories would, of course, be possible by suitably altering the timing control.
The colour memory 1 can have a number (>2) of sections. For instance, three memory sections may be provided, the additional memory section containing colour reference data for high intensity versions of the standard range of colours. Where three memory sections of the colour memory 1 are provided, one additional address lead such as lead a5 would be required to provide a 2-bit select code from the select circuit 11.
In the modification shown in Fig. 2, the colour memory 1 comprises three separate sections Ma, Mb and Mc to which the four address leads a1 to a4 are connected in common. Each of these separate sections contains sixteen memory locations and colour reference data for standard, high and low intensity versions of a range of 16 colours are stored in corresponding memory locations of the three memory sections. Thus, when a 4-bit word is applied to the address leads a1 to a4 from the addressing circuit 2, all three memory locations which contain colour reference data for the colour concerned are addressed concurrently. The select circuit 11 now has separate leads S1 to S3 which are connected respectively to the separate sections Ma, Mb and Mc. When one of these select leads is energised by the select circuit 11, the relevant memory section is activated and colour reference data can only be read out from an address memory location of that memory section. The read-out colour reference data is latched via an OR-gate 15 into the read-out circuit 3 for utilisation, as before.
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Claims (1)
- 4GB 2 167 926A 41. An electronic colour signal generator for a colour image display system; which generator comprises a memory having addressable memory locations for storing colour reference5 data, addressing means connected to an address input of the memory for generating address words for selectively addressing the memory locations, each address word being generated under control of a received first di-10 gital signal representing at least one element of an image to be displayed, and reading means connected to a data output of the memory for outputting the colour reference data from the selected memory locations, 15 characterised in that said memory comprises a number (Ns*2) of sets of memory locations each having an equal storage capacity, each set comprising data for different intensities of each colour of a plurality of different colours, 20 said colour signal generator further comprising selection means for selecting under control of a received intensity indication a corresponding set of memory locations out of said number for rendering effective said address words 25 only in respect of that corresponding set of memory locations.2. A colour signal generator as claimed in Claim 1, characterised in that said selection means comprises a select circuit for generat-30 ing an additional address word under control of said intensity indication, said select circuit having an output connected to said addressing means for supplying said additional address word thereto, said addressing means being 35 appropriate for forming composite address words for addressing memory locations by adding said additional address word to the address words.3. A colour signal generator as claimed in 40 Claim 1, characterised in that the memory is composed of a number of sections which contain a respective one of the sets of memory locations, with corresponding memory locations in the different sets being addressable in 45 common by the same word in the first digital signal, and in that said selection means comprises a select circuit for generating under control of said intensity indication a select signal which enables for read-out the correspond-50 ing memory section.4. A colour signal generator as claimed in any preceding Claim, characterised by having two sets of memory locations.5. An electronic colour signal generator for 55 a colour image display system, substantially as hereinbefore described with reference to the accompanying drawings.Printed in the United Kingdom forHer Majesty's Stationery Office, Dd 8818935, 1986, 4235.Published at The Patent Office, 25 Southampton Buildings.London. WC2A 1AY, from which copies may be obtained.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08429801A GB2167926A (en) | 1984-11-26 | 1984-11-26 | Colour signal generator for crt image display |
| EP19850201854 EP0184246A2 (en) | 1984-11-26 | 1985-11-12 | Electronic colour signal generator and colour image display system provided therewith |
| JP60261583A JPS61132995A (en) | 1984-11-26 | 1985-11-22 | Electronic color signal generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08429801A GB2167926A (en) | 1984-11-26 | 1984-11-26 | Colour signal generator for crt image display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8429801D0 GB8429801D0 (en) | 1985-01-03 |
| GB2167926A true GB2167926A (en) | 1986-06-04 |
Family
ID=10570265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08429801A Withdrawn GB2167926A (en) | 1984-11-26 | 1984-11-26 | Colour signal generator for crt image display |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0184246A2 (en) |
| JP (1) | JPS61132995A (en) |
| GB (1) | GB2167926A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4772881A (en) * | 1986-10-27 | 1988-09-20 | Silicon Graphics, Inc. | Pixel mapping apparatus for color graphics display |
| US4789854A (en) * | 1986-01-14 | 1988-12-06 | Ascii Corporation | Color video display apparatus |
| DE3910340A1 (en) * | 1988-03-30 | 1989-10-19 | Toshiba Kawasaki Kk | DEVICE AND METHOD FOR CONVERTING A GROUP OF ATTRIBUTES OF DISPLAY DATA IN A CODE |
| DE3910339A1 (en) * | 1988-03-30 | 1989-10-19 | Toshiba Kawasaki Kk | DEVICE AND METHOD FOR MAKING ATTRIBUTES OF DISPLAY DATA IN REQUIRED COLORS |
| DE3910338A1 (en) * | 1988-03-30 | 1989-10-19 | Toshiba Kawasaki Kk | DEVICE AND METHOD FOR CONVERTING AN ATTRIBUTE OF DISPLAY DATA IN A CODE |
| US4931785A (en) * | 1986-06-17 | 1990-06-05 | Ascii Corporation | Display apparatus |
| US4942388A (en) * | 1986-09-02 | 1990-07-17 | Grumman Aerospace Corporation | Real time color display |
| US5086295A (en) * | 1988-01-12 | 1992-02-04 | Boettcher Eric R | Apparatus for increasing color and spatial resolutions of a raster graphics system |
| US5124688A (en) * | 1990-05-07 | 1992-06-23 | Mass Microsystems | Method and apparatus for converting digital YUV video signals to RGB video signals |
| US5140312A (en) * | 1986-06-17 | 1992-08-18 | Ascii Corporation | Display apparatus |
| GB2270450A (en) * | 1992-09-08 | 1994-03-09 | Silicon Graphics Incorporation | Intergrated apparatus for displaying a plurality of modes of color information on a computer output display |
| US5847700A (en) * | 1991-06-14 | 1998-12-08 | Silicon Graphics, Inc. | Integrated apparatus for displaying a plurality of modes of color information on a computer output display |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4774495A (en) * | 1986-09-02 | 1988-09-27 | North American Philips Consumer Electronics Corp. | Video monitor interface circuit for digital color signals |
| US5204664A (en) * | 1990-05-16 | 1993-04-20 | Sanyo Electric Co., Ltd. | Display apparatus having a look-up table for converting pixel data to color data |
| GB2271493A (en) * | 1992-10-02 | 1994-04-13 | Canon Res Ct Europe Ltd | Processing colour image data |
| US6624822B2 (en) | 1997-12-08 | 2003-09-23 | Sony Corporation | Data conversion apparatus and image generation apparatus |
| JP3903557B2 (en) | 1997-12-08 | 2007-04-11 | ソニー株式会社 | Data conversion apparatus and image generation apparatus |
-
1984
- 1984-11-26 GB GB08429801A patent/GB2167926A/en not_active Withdrawn
-
1985
- 1985-11-12 EP EP19850201854 patent/EP0184246A2/en not_active Withdrawn
- 1985-11-22 JP JP60261583A patent/JPS61132995A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4789854A (en) * | 1986-01-14 | 1988-12-06 | Ascii Corporation | Color video display apparatus |
| US4931785A (en) * | 1986-06-17 | 1990-06-05 | Ascii Corporation | Display apparatus |
| US5140312A (en) * | 1986-06-17 | 1992-08-18 | Ascii Corporation | Display apparatus |
| US4942388A (en) * | 1986-09-02 | 1990-07-17 | Grumman Aerospace Corporation | Real time color display |
| US4772881A (en) * | 1986-10-27 | 1988-09-20 | Silicon Graphics, Inc. | Pixel mapping apparatus for color graphics display |
| US5086295A (en) * | 1988-01-12 | 1992-02-04 | Boettcher Eric R | Apparatus for increasing color and spatial resolutions of a raster graphics system |
| DE3910338A1 (en) * | 1988-03-30 | 1989-10-19 | Toshiba Kawasaki Kk | DEVICE AND METHOD FOR CONVERTING AN ATTRIBUTE OF DISPLAY DATA IN A CODE |
| DE3910339A1 (en) * | 1988-03-30 | 1989-10-19 | Toshiba Kawasaki Kk | DEVICE AND METHOD FOR MAKING ATTRIBUTES OF DISPLAY DATA IN REQUIRED COLORS |
| DE3910340A1 (en) * | 1988-03-30 | 1989-10-19 | Toshiba Kawasaki Kk | DEVICE AND METHOD FOR CONVERTING A GROUP OF ATTRIBUTES OF DISPLAY DATA IN A CODE |
| US5481661A (en) * | 1988-03-30 | 1996-01-02 | Kabushiki Kaisha Toshiba | Method and apparatus for converting attribute of display data into code |
| US5539432A (en) * | 1988-03-30 | 1996-07-23 | Kabushiki Kaisha Toshiba | Method of and apparatus of converting a set of attributes of display data into code |
| US5124688A (en) * | 1990-05-07 | 1992-06-23 | Mass Microsystems | Method and apparatus for converting digital YUV video signals to RGB video signals |
| US5847700A (en) * | 1991-06-14 | 1998-12-08 | Silicon Graphics, Inc. | Integrated apparatus for displaying a plurality of modes of color information on a computer output display |
| GB2270450A (en) * | 1992-09-08 | 1994-03-09 | Silicon Graphics Incorporation | Intergrated apparatus for displaying a plurality of modes of color information on a computer output display |
| GB2270450B (en) * | 1992-09-08 | 1997-03-26 | Silicon Graphics Incorporation | Integrated apparatus for displaying a plurality of modes of color information on a computer output display |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8429801D0 (en) | 1985-01-03 |
| EP0184246A2 (en) | 1986-06-11 |
| JPS61132995A (en) | 1986-06-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |