Hardware-based accelerated color correction filtering system

• US 7,046,255 B2
• Filed: 06/28/2001
• Issued: 05/16/2006
• Est. Priority Date: 06/28/2001
• Status: Expired due to Fees

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Bayramoglu, Gokalp, D'Souza, Henry M
• Primary Examiner(s): YANG, RYAN R
• Application Number:
  US09/893,396
• Publication Number:
  US 20030011616A1
• Time in Patent Office: 1,783 Days
• Field of Search: 345/600, 345/601, 345/602, 345/690, 345/590, 345/589, 382/167, 382/260, 382/274, 348/179, 348/602, 348/254, 358/518, 358/519
• US Class Current: 345/602
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 5/02 characterised by the way in which colour is displayed details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607

Abstract

A hardware-implemented color video data correction filtering system includes a plurality of linearization tables to gamma decompensate input color video data referenced to a non-linear color space, a plurality of a set of pre-calculated gamut shifting arrays to compensate for color point data of a plurality of constituent colors of a color monitor with each set of pre-calculated gamut shifting arrays coupled to one linearization table of the plurality of linearization tables, a plurality of hardware adders with each hardware adder coupled to one of the set of pre-calculated gamut shifting arrays, and a plurality of non-linearization tables coupled to the plurality of hardware adders to compensate for non-linearities of the color monitor and produce output color video data compensated for non-linearities and color points of the color monitor. Color video data is corrected in an accelerated manner through use of the pre-calculated gamut shifting arrays.

Claims

1. A color video data correction filtering system, comprising:

a preset monitor profile that comprises monitor specific color characteristics and monitor specific input-output characteristics;

a plurality of sets of gamut shifting arrays adapted to obtain the monitor specific color characteristics from the preset monitor profile to compensate for color point data of a plurality of constituent colors of a color monitor with each set of gamut shifting arrays corresponding to a multiplication look-up table (MLUT) comprising values that represent specific multiplication operations; and

a plurality of non-linearization tables, each adapted to receive a linear input from one of the sets of gamut shifting arrays and to obtain the monitor specific input-output characteristics from the preset monitor profile to compensate for non-linearities of the color monitor and produce output color video data compensated for non-linearities and color points of the color monitor.

2. The color filtering system of claim 1, wherein the plurality of constituent colors are representative of a non-linear sRGB color space.

3. The color filtering system of claim 1, further comprising:

a graphics controller coupled to the plurality sets of gamut shifting arrays, wherein compensation for color point data through utilization of the plurality of sets of gamut shifting arrays is performed at the full processing speed of the graphics controller.

4. The color filtering system of claim 1, wherein the system is adapted to correct input color video data from a website.

5. The color filtering system of claim 1, wherein the non-linearities of the color monitor comprise an input-output characteristic for each constituent color of the color monitor.

7. The computer system of claim 5, wherein the plurality of constituent colors are referenced to a non-linear color space.

8. The computer system of claim 5, wherein the plurality of constituent colors are representative of a non-linear sRGB color space.

9. The computer system of claim 5, wherein the plurality of sets of gamut shifting arrays is stored in a plurality of look-up tables.

10. The computer system of claim 5, wherein the non-linearities of the color monitor comprise an input-output characteristic for each constituent color of the color monitor.

11. The computer system of claim 5, further comprising:

a graphics controller coupled to the plurality of sets of gamut shifting arrays, wherein compensation for color point data through utilization of the plurality of sets of gamut shifting arrays is performed at the full processing speed of the graphics controller.

6. A computer system, comprising:

a processor;

video memory coupled to the processor; and

a color video data correction filtering system coupled to the processor, the system comprising;

a preset monitor profile that comprises monitor specific color characteristics and monitor specific input-output characteristics;

a plurality of sets of gamut shifting arrays adapted to obtain the monitor specific color characteristics from the preset monitor profile to compensate for color point data of a plurality of constituent colors of a color monitor with each preset set of pre-calculated gamut shifting arrays corresponding to a multiplication look-up table (MLUT) comprising values that represent specific multiplication operations; and

a plurality of non-linearization tables, each adapted to receive a linear input from one of the sets of gamut shifting arrays and to obtain the monitor specific input-output characteristics from the preset monitor profile to compensate for non-linearities of the color monitor and produce output color video data compensated for non-linearities and color point of the color monitor.

12. A method of color video data correction filtering, comprising the steps of:

retrieving monitor specific color characteristics and monitor specific input-output characteristics from a preset monitor profile;

compensating for color point linear data of a plurality of constituent colors of a color monitor by populating a plurality of gamut shifting arrays with the monitor specific color characteristics and applying the plurality of gamut shifting arrays to the color point linear data, each of the plurality of gamut shifting arrays corresponding to a multiplication look-up table (MLUT) comprising values that represent specific multiplication operations; and

compensating the color linear point data after application of the plurality of gamut shifting arrays for non-linearities of the color monitor by populating a plurality of non-linearization tables with the input-output specific characteristics and applying the plurality of non-linearization tables to the color point linear data to produce output color video data compensated for non-linearities and color points of the color monitor.

13. The method of claim 12, wherein the plurality of constituent colors are referenced to a non-linear color space.

14. The method of claim 12, wherein the plurality of constituent colors are representative of a non-linear sRGB color space.

15. The method of claim 12, wherein each of the steps of gamma decompensating, compensating using the plurality of pre-calculated gamut shifting arrays and compensating using the plurality of non-linearization tables is performed at a substantially full video rate.

16. A color correction system, comprising:

a preset monitor profile that comprises monitor specific color characteristics and monitor specific input-output characteristics;

a color filter that receives image data and produces color video data;

a color point correction system that receives the monitor specific color characteristics from the preset monitor profile and applies the monitor specific color characteristics to the color video data to produce color point linearity corrected video data; and

a non-linearity correction system that receives the monitor specific input-output characteristics from the preset monitor profile and applies the monitor specific input-output characteristics to the color point linearity corrected video data to produce non-linearity corrected video data.

17. The color correction system set forth in claim 16, wherein the color filter decompensates for non-linear RGB input based on a standard color image gamma function.

18. The color correction system set forth in claim 16, wherein each of the plurality of MLUTs are loaded with pre-calculated values that represent specific multiplication operations.

19. The color correction system set forth in claim 16, wherein each of the plurality of MLUTs comprises pre-calculated RGB component outputs for each of 256 intensities of each primary color.

20. The color correction system set forth in claim 16, wherein the non-linearity correction system comprises a set of non-linearization color look-up tables (CLUTs).