Graphics controller providing for efficient pixel value transformation

• US 20060209079A1
• Filed: 03/16/2005
• Published: 09/21/2006
• Est. Priority Date: 03/16/2005
• Status: Abandoned Application

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Rai, Barinder Singh, Jeffrey, Eric
• Application Number:
  US11/081,901
• Publication Number:
  US 20060209079A1
• Time in Patent Office: Days
• US Class Current: 345/520
• CPC Class Codes: G06T 5/92 based on global image properties
• CPC Class Codes: G09G 2320/0271 Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
• CPC Class Codes: G09G 5/363 Graphics controllers

Abstract

A graphics controller providing for efficient pixel value transformations. A graphics controller interfaces between a host and a graphics display device for displaying pixels having pixel values. The graphics controller includes a solarizing circuit having means for transforming an original pixel value to a transformed pixel value according to a transform function, said transform function having a negative slope at said original pixel value.

Claims

1. A graphics controller for interfacing between a host and a graphics display device for displaying pixels having pixel values, comprising a solarizing circuit having means for transforming an original pixel value to a transformed pixel value according to a transform function, said transform function having a negative slope at said original pixel value.

2. The graphics controller of claim 1, wherein said solarizing circuit further includes means for varying said slope.

3. The graphics controller of claim 2, wherein said solarizing circuit further includes memory means for storing one or more specifications sufficient for defining said slope.

4. The graphics controller of claim 1, wherein said transform function is piecewise linear.

5. The graphics controller of claim 4, wherein said transform function consists of two line segments.

6. The graphics controller of claim 5, wherein one of said two line segments has a positive slope.

7. The graphics controller of claim 6, wherein said positive slope substantially equals said negative slope.

8. The graphics controller of claim 6, wherein said positive slope is substantially not equal to said negative slope.

9. A solarizing circuit, comprising means for transforming an original pixel value to a transformed pixel value according to a transform function, said transform function having a negative slope at said original pixel value.

10. The solarizing circuit of claim 9, further comprising means for varying said slope.

11. The solarizing circuit of claim 10, further comprising memory means for storing one or more specifications sufficient for defining said slope.

12. The solarizing circuit of claim 9, wherein said transform function is piecewise linear.

13. The solarizing circuit of claim 12, wherein said transform function consists of two line segments and one of said two line segments has a positive slope.

14. A graphics display system, comprising:

a host;

a graphics display device for displaying pixels having pixel values; and

a graphics controller for interfacing between said host and said graphics display device, said graphics controller comprising a solarizing circuit having means for transforming an original pixel value to a transformed pixel value according to a transform function, said transform function having a negative slope at said original pixel value.

15. The system of claim 14, wherein said solarizing circuit further includes means for varying said slope.

16. The system of claim 15, wherein said solarizing circuit further includes memory means for storing one or more specifications sufficient for defining said slope.

17. The system of claim 14, wherein said transform function is piecewise linear.

18. The system of claim 17, wherein said transform function consists of two line segments.

19. The system of claim 18, wherein one of said two liner segments has a positive slope.

20. The system of claim 19, wherein said positive slope substantially equals said negative slope.