Method and system for fast image correction

• US 6,963,668 B2
• Filed: 03/22/2001
• Issued: 11/08/2005
• Est. Priority Date: 11/13/1998
• Status: Expired due to Term

• Current Assignee: RPX Corporation
• Original Assignee: LightSurf Technologies, Inc. (VeriSign, Inc.)
• Inventors: van Prooijen, Cornelis P., Engeldrum, Peter G., Strother, Thomas L., Hilliard, William J., Mattox, Joel D., Deutch, James E., Bernard, Peter
• Primary Examiner(s): Johns, Andrew W.
• Assistant Examiner(s): Alavi, Amir
• Application Number:
  US09/815,236
• Publication Number:
  US 20020003903A1
• Time in Patent Office: 1,692 Days
• Field of Search: 382/162, 382/166, 382/167, 382/232, 382/233, 382/250, 382/254, 382/274, 382/276, 382/284, 375/240.01, 375/240.2, 375/240.24, 375/240.25, 375/240.27, 358/518, 358/520, 358/523
• US Class Current: 382/233
• CPC Class Codes: G06F 3/14 Digital output to display device ; Cooperation and interconnection of the display device with other functional units
• 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
• CPC Class Codes: H04N 1/32512 of different type, e.g. internal and external devices
• CPC Class Codes: H04N 1/32529 of different type, e.g. internal and external devices
• CPC Class Codes: H04N 1/333 Mode signalling or mode changing; Handshaking therefor
• CPC Class Codes: H04N 1/60 Colour correction or control H04N1/54 takes precedence
• CPC Class Codes: H04N 1/6005 with luminance or chrominance signals, e.g. LC1C2, HSL or YUV
• CPC Class Codes: H04N 1/64 Systems for the transmission or the storage of the colour picture signal; Details therefor, e.g. coding or decoding means therefor H04N19/00 takes precedence
• CPC Class Codes: H04N 2201/33357 Compression mode

Abstract

Compressed image files are partially preprocessed to expedite color correction and delivery of color corrected images. Color correction may be accomplished by processing only the luminance channel, only the color channels, or a combination of the luminance and color channels. A method for adjusting characteristics of a compressed image file including compressed characteristics elements and compressed image elements, includes: in the compressed image file, separating the compressed characteristics elements and the compressed image elements; decompressing one or more of the compressed characteristics elements; and adjusting the decompressed characteristics elements.

Claims

1. A method for adjusting characteristics of a compressed image file including compressed characteristics elements and compressed image elements, comprising:

in the compressed image file, separating the compressed characteristics elements and the compressed image elements;

decompressing one or more of the compressed characteristics elements; and

adjusting the decompressed characteristics elements.

2. The method of claim 1, further comprising:

compressing the adjusted characteristics elements.

3. The method of claim 1, further comprising:

combining the compressed adjusted characteristics elements with the compressed image elements to form an adjusted compressed image file.

4. The method of claim 3, further comprising:

storing the adjusted compressed image file for display.

5. The method of claim 3, further comprising:

transmitting the adjusted compressed image file for display.

6. The method of claim 1, wherein the characteristics elements include one or more of luminance, color, and sizing characteristics.

7. The method of claim 6, wherein the decompressing of the one or more of the compressed characteristics elements includes decompressing luminance characteristics elements from the compressed characteristics elements but not color characteristics elements.

8. The method of claim 1, wherein the compressed image file is compressed according to a compression standard selected from the group of compression standards including JPEG, JPEG 2000, MPEG, MPEG2, MPEG3, MPEG4, GIF, AVI, VRML, ART, WMF, FPX, BMP, PCX, TIFF, Quick Time, Real Media, Postscript, PDF, and Flash.

9. The method of claim 8, wherein the compressed image file is a JPEG file including Y, U and V color channels, and adjusting the decompressed characteristics elements comprises:

transforming the channels with a discrete cosine transform function in 8×

8 pixel blocks.

10. The method of claim 8, wherein adjusting the decompressed characteristics elements comprises:

adjusting the decompressed characteristics elements by one or more methods selected from the group of methods including tone reproduction curve correction, correction for viewing surround conditions, linear transformation for correction of white point, linear transformation for correction of primary chromaticities, and chromatic adaptation transforms.

11. The method of claim 1, wherein decompressing one or more of the characteristics elements further comprises:

combining the decompressed characteristics elements with the compressed image elements to create a partially decompressed image file.

12. The method of claim 11, wherein adjusting the decompressed characteristics elements comprises:

adjusting the decompressed characteristics elements of the partially decompressed image file to create an adjusted partially decompressed image file.

13. The method of claim 12, wherein compressing the adjusted characteristics elements comprises:

compressing the adjusted partially decompressed image file.

14. The method of claim 13, wherein the characteristics elements include one or more of luminance, color, and sizing characteristics.

15. The method of claim 14, wherein the compressed image file is compressed according to a compression standard selected from the group of compression standards including JPEG, JPEG 2000, MPEG, MPEG2, MPEG3, MPEG4, GIF, AVI, VRML, ART, WMF, FPX, BMP, PCX, TIFF, Quick Time, Real Media, Postscript, PDF, and Flash.

16. The method of claim 15, wherein the compressed image file is a JPEG file including Y, U and V color channels, and adjusting the decompressed characteristics elements comprises:

transforming the channels with a discrete cosine transform function in 8×

8 pixel blocks.

17. The method of claim 12, wherein adjusting the decompressed characteristics elements comprises:

adjusting the decompressed characteristics elements by one or more methods selected from the group of methods including tone reproduction curve correction, correction for viewing surround conditions, linear transformation for correction of white point, linear transformation for correction of primary chromaticities, and chromatic adaptation transforms.

18. A method for adjusting characteristics of a compressed image file including characteristics elements and image elements, comprising:

receiving the compressed image file with one or more of the characteristics elements in a decompressed state and the image elements in a compressed state; and

adjusting the decompressed characteristics elements.

19. The method of claim 18, further comprising:

compressing the adjusted characteristics elements.

20. The method of claim 19, further comprising:

combining the compressed adjusted characteristics elements with the compressed image elements to form an adjusted compressed image file.

21. The method of claim 20, further comprising:

storing the adjusted compressed image file for display.

22. The method of claim 20, further comprising:

transmitting the adjusted compressed image file for display.

23. The method of claim 18, wherein the characteristics elements include one or more of luminance, color, and sizing characteristics.

24. The method of claim 23, wherein the compressed image file is compressed according to a compression standard selected from the group of compression standards including JPEG, JPEG 2000, MPEG, MPEG2, MPEG3, MPEG4, GIF, AVI, VRML, ART, WMF, FPX, BMP, PCX, TIFF, Quick Time, Real Media, Postscript, PDF, and Flash.

25. The method of claim 24, wherein the compressed image file is a IPEG file including Y, U and V color channels, and adjusting the decompressed characteristics elements comprises:

transforming the channels with a discrete cosine transform function in 8×

8 pixel blocks.

26. The method of claim 23, wherein adjusting the decompressed characteristics elements comprises:

adjusting the decompressed characteristics elements by one or more methods selected from the group of methods including tone reproduction curve correction, correction for viewing surround conditions, linear transformation for correction of white point, linear transformation for correction of primary chromaticities, and chromatic adaptation transforms.

27. The method of claim 18, wherein decompressing one or more of the characteristics elements further comprises:

combining the decompressed characteristics elements with the compressed image elements to create a partially decompressed image file.

28. The method of claim 27, wherein adjusting the decompressed characteristics elements comprises:

adjusting the decompressed characteristics elements of the partially decompressed image file to create an adjusted partially decompressed image file.

29. The method of claim 28, wherein compressing the adjusted characteristics elements comprises:

compressing the adjusted partially decompressed image file.

30. The method of claim 29, wherein the characteristics elements include one or more of luminance, color, and sizing characteristics.

31. The method of claim 30, wherein the compressed image file is compressed according to a compression standard selected from the group of compression standards including JPEG, JPEG 2000, MPEG, MPEG2, MPEG3, MPEG4, GIF, AVI, VRML, ART, WMF, FPX, BMP, PCX, TIFF, Quick Time, Real Media, Postscript, PDF, and Flash.

32. The method of claim 31, wherein the compressed image file is a JPEG file including Y, U and V color channels, and adjusting the decompressed characteristics elements comprises:

transforming the channels with a discrete cosine transform function in 8×

8 pixel blocks.

33. The method of claim 30, wherein adjusting the decompressed characteristics elements comprises:

adjusting the decompressed characteristics elements by one or more methods selected from the group of methods including tone reproduction curve correction, correction for viewing surround conditions, linear transformation for correction of white point, linear transformation for correction of primary chromaticities, and chromatic adaptation transforms.

34. The method of claim 18, wherein receiving the image file further comprises:

receiving authoring characteristics information related to the display characteristics of the display device upon which the image file was created.

35. The method of claim 34, wherein the authoring characteristics information is part of the compressed image file.

36. The method of claim 35, wherein the authoring characteristics information is received in an uncompressed state.

37. The method of claim 36, wherein adjusting the decompressed characteristics elements comprises:

adjusting the decompressed characteristics elements in accordance with the authoring characteristics information.

38. The method of claim 34, further comprising:

combining the authoring characteristics information with the decompressed characteristics elements to form a net correction file.

39. The method of claim 38, wherein adjusting the decompressed characteristics elements comprises:

adjusting the decompressed characteristics elements in accordance with the net correction file.