Automated sharpening of images for soft proofing

• US 20020171855A1
• Filed: 03/29/2002
• Published: 11/21/2002
• Est. Priority Date: 03/30/2001
• Status: Abandoned Application

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Edge, Christopher J.
• Application Number:
  US10/113,830
• Publication Number:
  US 20020171855A1
• Time in Patent Office: Days
• US Class Current: 358/1.9
• CPC Class Codes: G09G 2320/02 Improving the quality of display appearance
• CPC Class Codes: G09G 2340/04 Changes in size, position or resolution of an image
• CPC Class Codes: H04N 1/3935 with modification of image resolution, i.e. determining the values of picture elements at new relative positions
• CPC Class Codes: H04N 1/4092 Edge or detail enhancement
• CPC Class Codes: H04N 1/58 Edge or detail enhancement; Noise or error suppression, e.g. colour misregistration correction H04N1/62 takes precedence

Abstract

Automated sharpening of images for soft proofing involves dynamic adjustment of the degree of sharpening applied to soft proof images based on the magnification factor applied by the display device. The appearance of image detail in a soft proof image can vary based on the magnification factor applied to the image. Sharpening of the original high resolution RGB image data may not be required if significant zooming is employed. When reduced magnification is required, however, much of the image detail can be lost. In this case, dynamic image sharpening helps to compensate for the reduced magnification, and thereby preserve the appearance of detail for the viewer. In particular, the degree of image sharpening may be adjusted in a generally inverse proportion to the magnification factor, providing an adaptive sharpening function.

Claims

1. A method comprising:

applying a sharpening function to an image; and

controlling the sharpening function based on a magnification factor associated with the image.

2. The method of claim 1, wherein controlling the sharpening function includes adjusting a degree of sharpening based on the magnification factor.

3. The method of claim 1, wherein controlling the sharpening function includes adjusting a degree of sharpening in inverse proportion to the magnification factor.

4. The method of claim 1, further comprising adjusting a profile for a display device that presents the image to compensate for differences between the darkest color values produced by the display device and a perfect black.

5. A system comprising:

a display device that displays a representation of a color image; and

a processor that applies a sharpening function to the color image, wherein the processor controls the sharpening function based on a magnification factor associated with the color image.

6. The system of claim 5, wherein the processor controls the sharpening function includes adjusting a degree of sharpening based on the magnification factor.

7. The system of claim 5, wherein the processor controls the sharpening function includes adjusting a degree of sharpening in inverse proportion to the magnification factor.

8. The system of claim 5, wherein the profile for a display device that presents the color image has been adjusted to compensate for differences between the darkest color values produced by the display device and a perfect black.

9. A computer-readable medium containing instructions that cause a programmable processor to:

apply a sharpening function to an image; and

control the sharpening function based on a magnification factor associated with the image when presented on a display device.

10. The computer-readable medium of claim 9, wherein the instructions cause the processor to control the sharpening function by adjusting a degree of sharpening based on the magnification factor.

11. The computer-readable medium of claim 9, wherein the instructions cause the processor to control the sharpening function by adjusting a degree of sharpening in inverse proportion to the magnification factor.

12. The computer-readable medium of claim 9, wherein the instructions cause the processor to adjust a profile for a display device that presents the image to compensate for differences between the darkest color values produced by the display device and a perfect black.

14. The method of claim 13, wherein one of the operating modes comprises a fixed magnification factor mode in which the soft proofing system presents the image with a fixed magnification, and wherein selecting a scaling function includes selecting an optimal scaling function when the selected operating mode is the fixed magnification factor mode.

15. The method of claim 14, wherein the optimal scaling function comprises a bicubic interpolation function.

16. The method of claim 13, wherein one of the operating modes comprises a fixed magnification factor mode in which the soft proofing system presents the image with a fixed magnification, and wherein selecting a sharpening function includes selecting a fixed sharpening function that is independent of the magnification factor when the selected operating mode is the fixed magnification factor mode.

17. The method of claim 13, wherein one of the operating modes comprises a variable magnification factor mode in which the soft proofing system presents the image with a variable magnification factor, and wherein selecting a scaling function includes selecting a generic scaling function when the selected operating mode is the variable magnification factor mode.

18. The method of claim 17, wherein the generic scaling function includes one of a bicubic interpolation function and a nearest neighbor interpolation function.

19. The method of claim 17, wherein one of the operating modes comprises a variable magnification factor mode in which the soft proofing system presents the image with a variable magnification factor, and wherein selecting a sharpening function includes selecting a dynamic sharpening function that is dependent on the magnification factor when the selected operating mode is the variable magnification factor mode.

20. The method of claim 19, further comprising selecting the sharpening function by adjusting a degree of sharpening based on the magnification factor.

21. The method of claim 13, wherein one of the operating modes comprises an optimal mode in which the soft proofing system presents the image with a variable magnification factor, and wherein selecting a scaling function includes selecting an optimal scaling function when the selected operating mode is the optimal mode, and selecting a sharpening function includes selecting a dynamic sharpening function that is dependent on the magnification factor when the selected operating mode is the optimal mode.

22. The method of claim 21, wherein the optimal scaling function comprises a bicubic interpolation function.

23. The method of claim 21, further comprising selecting the sharpening function by adjusting a degree of sharpening based on the magnification factor.

25. The system of claim 24, wherein one of the operating modes includes a fixed magnification factor mode in which the display device presents the image with a fixed magnification, and the processor selects an optimal scaling function when the selected operating mode is the fixed magnification factor mode.

26. The system of claim 25, wherein the optimal scaling function comprises a bicubic interpolation function.

27. The system of claim 24, wherein one of the operating modes comprises a fixed magnification factor mode in which the display device presents the image with a fixed magnification, and the processor selects a fixed sharpening function that is independent of the magnification factor when the selected operating mode is the fixed magnification factor mode.

28. The system of claim 24, wherein one of the operating modes comprises a variable magnification factor mode in which the display device presents the image with a variable magnification factor, and the processor selects a generic scaling function when the selected operating mode is the variable magnification factor mode.

29. The system of claim 28, wherein the generic scaling function includes one of a bicubic interpolation function and a nearest neighbor interpolation function.

30. The system of claim 24, wherein one of the operating modes comprises a variable magnification factor mode in which the display device presents the image with a variable magnification factor, and the processor selects a dynamic sharpening function that is dependent on the magnification factor when the selected operating mode is the variable magnification factor mode.

31. The system of claim 30, wherein the processor selects the sharpening function by adjusting a degree of sharpening based on the magnification factor.

32. The system of claim 24, wherein one of the operating modes comprises an optimal mode in which the display device presents the image with a variable magnification factor, and the processor selects an optimal scaling function when the selected operating mode is the optimal mode, and a dynamic sharpening function that is dependent on the magnification factor when the selected operating mode is the optimal mode.

33. The system of claim 32, wherein the optimal scaling function comprises a bicubic interpolation function.

34. The system of claim 32, wherein the processor selects the sharpening function by adjusting a degree of sharpening based on the magnification factor.

36. The computer-readable medium of claim 35, wherein one of the operating modes is a fixed magnification factor mode in which the soft proofing system presents the image with a fixed magnification, and the instructions cause the processor to select a scaling function includes selecting an optimal scaling function when the selected operating mode is the fixed magnification factor mode.

37. The computer-readable medium of claim 36, wherein the optimal scaling function is a bicubic interpolation function.

38. The computer-readable medium of claim 35, wherein one of the operating modes is a fixed magnification factor mode in which the soft proofing system presents the image with a fixed magnification, and the instructions cause the processor to select a fixed sharpening function that is independent of the magnification factor when the selected operating mode is the fixed magnification factor mode.

39. The computer-readable medium of claim 35, wherein one of the operating modes comprises a variable magnification factor mode in which the soft proofing system presents the image with a variable magnification factor, and the instructions cause the processor to select a generic scaling function when the selected operating mode is the variable magnification factor mode.

40. The computer-readable medium of claim 39, wherein the generic scaling function includes one of a bicubic interpolation function and a nearest neighbor interpolation function.

41. The computer-readable medium of claim 39, wherein one of the operating modes comprises a variable magnification factor mode in which the soft proofing system presents the image with a variable magnification factor, and the instructions cause the processor to select a dynamic sharpening function that is dependent on the magnification factor when the selected operating mode is the variable magnification factor mode.

42. The computer-readable medium of claim 41, and the instructions cause the processor to select the sharpening function by adjusting a degree of sharpening based on the magnification factor.

43. The computer-readable medium of claim 35, wherein one of the operating modes comprises an optimal mode in which the soft proofing system presents the image with a variable magnification factor, and the instructions cause the processor to select an optimal scaling function when the selected operating mode is the optimal mode, and select a dynamic sharpening function that is dependent on the magnification factor when the selected operating mode is the optimal mode.

44. The computer-readable medium of claim 43, wherein the optimal scaling function is a bicubic interpolation function.

45. The computer-readable medium of claim 43, wherein the instructions cause the processor to select the sharpening function by adjusting a degree of sharpening based on the magnification factor.

13. A method comprising:

selecting one of a plurality of operating modes for a soft proofing system;

selecting a scaling function for an image to be presented by the soft proofing system based on the selected operating mode; and

selecting a sharpening function for the image based on the selected operating mode.

24. A system comprising:

a display device that displays a representation of a color image; and

a processor that selects one of a plurality of operating modes, selects a scaling function for the color image to be presented by the display device based on the selected operating mode, and selects a sharpening function for the color image based on the selected operating mode.

35. A computer-readable medium comprising instructions that cause a programmable processor to:

select one of a plurality of operating modes for a soft proofing system;

select a scaling function for an image to be presented by the soft proofing system based on the selected operating mode; and

select a sharpening function for the image based on the selected operating mode.

46. A method comprising:

applying an interpolation-based scaling function to an image to be presented by a soft proofing system; and

applying a dynamic sharpening function to the image, wherein the dynamic sharpening function is adjusted according to a magnification factor of the image.

47. A method comprising:

applying an interpolation-based scaling function to an image to be presented by a soft proofing system; and

applying a fixed sharpening function to the image, wherein the fixed sharpening function is independent of a magnification factor of the image.

48. A method comprising:

applying an non-interpolation-based scaling function to an image to be presented by a soft proofing system; and

applying a dynamic sharpening function to the image, wherein the dynamic sharpening function is adjusted according to a magnification factor of the image.