System and method for determining an image frame color for an image frame

• US 20060132871A1
• Filed: 12/20/2004
• Published: 06/22/2006
• Est. Priority Date: 12/20/2004
• Status: Abandoned Application

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Beretta, Giordano B.
• Application Number:
  US11/017,012
• Publication Number:
  US 20060132871A1
• Time in Patent Office: Days
• US Class Current: 358/518
• CPC Class Codes: H04N 1/62 Retouching, i.e. modification of isolated colours only or in isolated picture areas only

Abstract

An automated method for determining an image frame color for an image frame that frames a first image, the first image positioned on a colored background. The method includes identifying a first color in a perceptually uniform color space based on a first portion of the first image. The method includes identifying a background color in the perceptually uniform color space based on the colored background. The method includes determining a first image frame color based on the identified first color and background color.

Claims

1. An automated method for determining an image frame color for an image frame that frames a first image, the first image positioned on a colored background, the method comprising:

identifying a first color in a perceptually uniform color space based on a first portion of the first image;

identifying a background color in the perceptually uniform color space based on the colored background; and

determining a first image frame color based on the identified first color and background color.

2. The automated method of claim 1, wherein the first portion of the first image is a center portion of the first image.

3. The automated method of claim 2, wherein the first color is identified by averaging colors appearing in the center portion of the first image in the perceptually uniform color space.

4. The automated method of claim 2, wherein the background color is identified by averaging colors appearing in the colored background in the perceptually uniform color space.

5. The automated method of claim 1, wherein the first image frame color is determined by blending the identified first color and background color in the perceptually uniform color space.

6. The automated method of claim 5, wherein blending the identified first color and background color comprises a linear interpolation between coordinates of the first color and the background color in the perceptually uniform color space.

7. The automated method of claim 6, wherein blending the identified first color and background color results in a range of colors between the first color and the background color, and wherein the first image frame color is selected from the range of colors.

8. The automated method of claim 7, wherein the first image frame color is selected from a middle of the range of colors.

9. The automated method of claim 1, and further comprising:

identifying a second color in the perceptually uniform color space based on a second portion of the first image.

10. The automated method of claim 9, wherein the second portion of the first image is a periphery portion of the first image.

11. The automated method of claim 10, wherein the second color is identified by averaging colors appearing in the periphery portion of the first image in the perceptually uniform color space.

12. The automated method of claim 9, and further comprising:

identifying whether the first image frame color and the second color are discriminable.

13. The automated method of claim 12, wherein identification of whether the first image frame color and the second color are discriminable is based on a difference between the first image frame color and the second color in the perceptually uniform color space.

14. The automated method of claim 13, wherein the step of identifying whether the first image frame color and the second color are discriminable further comprises:

comparing the difference to a threshold.

15. The automated method of claim 14, wherein the difference represents a number of just noticeable differences between the first image frame color and the second color in the perceptually uniform color space.

16. The automated method of claim 15, wherein the first image frame color and the second color are deemed to be discriminable if the difference is greater than a threshold number of just noticeable differences.

17. The automated method of claim 14, wherein the difference represents a difference in a number of lightness units between the first image frame color and the second color in the perceptually uniform color space, and wherein the first image frame color and the second color are deemed to be discriminable if the difference is greater than a threshold number of lightness units.

18. The automated method of claim 12, and further comprising:

adjusting the first image frame color if it is determined that the first image frame color and the second color are not discriminable.

19. The automated method of claim 18, wherein the step of adjusting the first image frame color comprises:

adjusting a lightness value of the first image frame color.

20. The automated method of claim 19, wherein the lightness value is adjusted based on a discriminability threshold.

21. The automated method of claim 20, wherein the lightness value is adjusted based on the discriminability threshold, and based on lightness values of the first image frame color and the second color with respect to a bias lightness value.

22. The automated method of claim 21, wherein the bias lightness value represents an effective mid-point between light and dark regions on a lightness axis in the perceptually uniform color space.

23. The automated method of claim 19, wherein the step of adjusting the first image frame color comprises:

adjusting at least one of a chroma value and a hue value of the first image frame color.

24. The automated method of claim 1, wherein the first image frame color is determined from a limited palette of colors.

25. The automated method of claim 1, and further comprising:

determining a plurality of image frame colors for a corresponding plurality of image frames appearing on a common page; and

identifying a single color to use for the plurality of image frames based on the plurality of image frame colors.

26. A system for identifying an image frame color for an image frame, the system comprising:

a memory for storing a first image to be framed by the image frame; and

a processor coupled to the memory for calculating a first color in a perceptually uniform color space based on a first portion of the first image, calculating a background color in the perceptually uniform color space based on a background for the first image, and determining a first image frame color based on the calculated first color and background color.

27. The system of claim 26, wherein the first portion of the first image is a center portion of the first image, and wherein the first color is calculated by averaging colors appearing in the center portion of the first image in the perceptually uniform color space.

28. The system of claim 26, wherein the background color is calculated by averaging colors appearing in the background for the first image in the perceptually uniform color space.

29. The system of claim 26, wherein the first image frame color is determined based on a linear interpolation between coordinates of the first color and the background color in the perceptually uniform color space.

30. The system of claim 26, wherein the processor is configured to calculate a second color in the perceptually uniform color space based on a second portion of the first image.

31. The system of claim 30, wherein the second color is calculated by averaging colors appearing in a periphery portion of the first image in the perceptually uniform color space.

32. The system of claim 30, wherein the processor is configured to identify whether the first image frame color and the second color are discriminable based on a difference between the first image frame color and the second color in the perceptually uniform color space.

33. The system of claim 32, wherein the processor is configured to adjust the first image frame color if it is determined that the first image frame color and the second color are not discriminable.

34. A system for automatically determining an image frame color for an image frame that substantially surrounds a first image, the first image positioned over a colored background, the system comprising:

means for identifying a first color in a perceptually uniform color space based on a first portion of the first image;

means for identifying a background color in the perceptually uniform color space based on the colored background; and

means for determining a first image frame color based on the identified first color and background color.

35. A computer-readable medium having computer-executable instructions for performing a method of determining an image frame color for an image frame, comprising:

calculating a first color in a perceptually uniform color space based on a first portion of a first image to be framed by the image frame;

calculating a background color in the perceptually uniform color space based on a background around the first image; and

determining a first image frame color based on the calculated first color and background color.

36. The computer-readable medium of claim 35, wherein the method further comprises:

calculating a second color in the perceptually uniform color space based on a second portion of the first image;

determining whether the first image frame color and the second color are discriminable; and

adjusting the first image frame color until the first image frame color and the second color are discriminable.