TRANSFORMATION OF EXIF IMAGES

• US 20080025649A1
• Filed: 08/09/2007
• Published: 01/31/2008
• Est. Priority Date: 02/07/2002
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: WONG, GILMAN, STOKES, MICHAEL, LIU, MIN, MATSUZAWA, TAKASHI
• Granted Patent: US 7,676,118 B2
• Time in Patent Office: Days
• US Class Current: 382/305
• CPC Class Codes: H04N 1/32128 attached to the image data, e.g. file header, transmitted message header, information on the same page or in the same computer file as the image for information embedded in the image H04N1/32144
• CPC Class Codes: H04N 2201/3243 of type information, e.g. handwritten or text document
• CPC Class Codes: H04N 2201/325 Modified version of the image, e.g. part of the image, image reduced in size or resolution, thumbnail or screennail
• CPC Class Codes: H04N 2201/3277 The additional information being stored in the same storage device as the image data
• CPC Class Codes: H04N 2201/33378 Type or format of data, e.g. colour or B/W, halftone or binary, computer image file or facsimile data

Abstract

A system, media, and method for transforming a main image of a digital image in accordance with a parameter are provided. The main image that is transformed based on the parameter may be one stored in the Exchangeable Image File (“EXIF”) format. In turn, the metadata, including the thumbnail image, is updated to correspond to the transformed main image. The transformed main image and updated metadata are stored together in a file using the EXIF format. Thus, the transformed main image may be viewed using a digital camera or viewer software compatible with a properly formatted EXIF file.

Claims

1. A method of transforming a digital image in accordance with a parameter for transformation, the method comprising:

accessing an EXIF stream of data containing the digital image, the EXIF stream having a main image, simple metadata, and complex metadata, wherein the complex metadata comprises a thumbnail image corresponding to the main image;

decoding the EXIF stream by extracting the main image and metadata including the thumbnail image from the EXIF stream;

if the thumbnail image is not in JPEG compressed format, converting the thumbnail image to the JPEG compressed format;

performing transformation on the JPEG compressed thumbnail image in accordance with the parameter;

updating the simple metadata to reflect the changes of the main image as transformed; and

storing, in an EXIF encoded file, the transformed main image, the updated simple metadata, and complex metadata including the transformed thumbnail image.

2. The method of claim 1, wherein said step of updating the simple metadata includes updating the simple metadata to contain height and width dimensions of the transformed image.

3. The method of claim 1, wherein the main image is transformed by rotating the main image a known amount to produce the transformed main image and the thumbnail image is transformed by rotating the thumbnail image by the known amount to produce the transformed thumbnail image having a viewing orientation corresponding to the viewing orientation of the transformed main image.

4. The method of claim 1, wherein the parameter alters a bit depth associated with the main image.

5. The method of claim 1, wherein the parameter alters a color associated with the main image.

6. The method of claim 1, wherein the parameter is associated with lossless transformations.

7. The method of claim 1, further comprising for the transformed main image, the updated simple metadata, and complex metadata including the transformed thumbnail, generating image file directories and sorting tags associated with the simple metadata and complex metadata.

8. One or more computer readable media executing instruction to perform a method of transforming a digital image in accordance with a parameter for lossless transformation, the method comprising:

accessing an EXIF stream of data containing the digital image, the EXIF stream having a main image, simple metadata, and complex metadata, wherein the complex metadata comprises a thumbnail image corresponding to the main image;

decoding the EXIF stream by extracting the main image and metadata including the thumbnail image from the EXIF stream;

if the thumbnail image is not in JPEG compressed format, converting the thumbnail image to the JPEG compressed format;

performing transformation on the JPEG compressed thumbnail image in accordance with the parameter;

updating the simple metadata to reflect the changes of the main image as transformed; and

storing, in an EXIF encoded file, the transformed main image, the updated simple metadata, and complex metadata including the transformed thumbnail image.

9. The media of claim 8, wherein said step of updating the simple metadata includes updating the simple metadata to contain height and width dimensions of the transformed image.

10. The media of claim 8, wherein the main image is transformed by rotating the main image a known amount to produce the transformed main image and the thumbnail image is transformed by rotating the thumbnail image by the known amount to produce the transformed thumbnail image having a viewing orientation corresponding to the viewing orientation of the transformed main image.

11. The media of claim 8, wherein the parameter alters a bit depth associated with the main image.

12. The media of claim 8, wherein the parameter alters a color associated with the main image.

13. The media of claim 8, further comprising for the transformed main image, the updated simple metadata, and complex metadata including the transformed thumbnail, generating image file directories and sorting tags associated with the simple metadata and complex metadata.

14. A computer system having a processor, a memory, and an operating environment, the computer system comprising:

a decoder object that accesses an EXIF stream of data containing the digital image, the EXIF stream having a main image, simple metadata, and complex metadata, wherein the complex metadata comprises a thumbnail image corresponding to the main image and that extracts, from the EXIF stream, the main image, simple metadata, and complex metadata associated with the main image;

a bitmap object that transforms the thumbnail image in accordance with the parameter to produce a transformed thumbnail image, wherein if the thumbnail image is not in JPEG compressed format, converting the thumbnail image to the JPEG compressed format prior to transforming the thumbnail image; and

an encoder object that transforms the metadata in accordance with the parameter and stores the transformed main image data, the transformed thumbnail image and transformed metadata in the file using the EXIF format.

15. The system of claim 14, wherein transforming the metadata includes updating the simple metadata to contain the height and width dimensions of the transformed image.

16. The system of claim 14, wherein the main image is transformed by rotating the main image a known amount to produce the transformed main image and the thumbnail image is transformed by rotating the thumbnail image by the known amount to produce the transformed thumbnail image having a viewing orientation corresponding to the viewing orientation of the transformed main image.

17. The system of claim 14, wherein the parameter alters a bit depth associated with the main image.

18. The system of claim 14, wherein the parameter alters a color associated with the main image.

19. The system of claim 14, wherein the parameter is associated with lossless transformations.

20. The system, of claim 14, further comprising for the transformed main image, the updated simple metadata, and complex metadata including the transformed thumbnail, the encoder object generates image file directories and sorts tags associated with the simple metadata and complex metadata.