Image file for storing digital images and ancillary data values using multiple encoding methods
View Patent ↗An image format for storing digital images within a baseline DCT compatible bitstream comprises entropy coded image data, a first application marker storing a first data value using a first encoding method to convey a first information value related to the image, and a second application marker storing a second data value using a second encoding method to convey the same said first information value related to the image. More specifically, the first application marker uses TIFF tags within an Exif application marker and the second application marker uses a FlashPix compatible structured storage stream, while the entropy coded data includes restart markers to define tile boundaries within the entropy coded image data.
1. A device for processing and storing digital images, the device comprising:
a processor; and
an electronic memory coupled to the processor, the electronic memory including a digital image file for storing only one digital image, the processor for reading the digital image file, for generating and storing entropy coded data for said digital image, for storing first ancillary encoded data in said digital image file using a first encoding method to generate first ancillary information for said digital image, and for storing second ancillary encoded data in said digital image file using a second encoding method different from said first encoding method for generating said first ancillary information for said digital image.
2. A device as claimed in claim 1 , wherein the first ancillary encoded data is encoded using a TIFF tag.
3. A device as claimed in claim 1 , wherein the entropy coded data is discrete cosine transform compressed data blocks in 64×64 tile segments.
4. A device as claimed in claim 1 , wherein the first ancillary encoded data is encoded using a TIFF tag, and the second ancillary encoded data is encoded using a second encoding method other than TIFF tags.
5. A device as claimed in claim 1 , wherein the first ancillary information provides an image capture date of the digital image.
6. A device as claimed in claim 1 , wherein the first ancillary information provides a camera parameter.
7. A device as claimed in claim 1 , wherein the first ancillary information provides an image copyright owner of the digital image.
8. A device as claimed in claim 1 , wherein the first ancillary information provides a description of the digital image.
9. A device as claimed in claim 1 , wherein the electronic memory comprises a removable memory card.
10. A tangible computer readable medium for storing instructions readable by the computer and which, when executed by the computer, enables the computer to perform the steps of:
retrieving a digital image file from a digital storage device that is electronically accessible by the computer, the digital image file comprising only one digital image;
storing entropy coded data for said digital image;
storing first ancillary encoded data in said digital image file using a first encoding method to convey a first ancillary information for said digital image; and
storing second ancillary encoded data in said digital image file using a second encoding method different from said first encoding method for conveying said first ancillary information for said digital image.
11. The computer readable medium according to claim 10 , wherein the computer comprises a digital camera.
12. The computer readable medium according to claim 10 , wherein said step of storing entropy code data is performed by a digital camera.
13. The computer readable medium according to claim 10 , wherein said step of storing first ancillary encoded data is performed by a digital camera.
14. The computer readable medium according to claim 10 , wherein said step of storing said second ancillary encoded data is performed by a digital camera.
15. The computer readable medium according to claim 10 , where said first encoding method comprises using a TIFF tag.