Claims
- 1. A method for generating multiple descriptions of compressed data, comprising:
generating a quantized bit stream using a reference quantization step; and re-quantizing the quantized bit stream using a first quantization step to generate a first description of compressed data, wherein the first quantization step is determined based on a first required scaling of the reference quantization step.
- 2. The method of claim 1, further comprising:
re-quantizing the quantized bit stream using a second quantization step to generate a second description of compressed data, wherein the second quantization step is determined based on a second required scaling of the reference quantization step.
- 3. The method of claim 1, wherein generating the quantized bit stream comprises:
using as the reference quantization step a quantization step for generating an archival compressed bit stream.
- 4. Apparatus for generating multiple descriptions of compressed data, comprising:
means for generating a quantized bit stream using a reference quantization step; and means for re-quantizing the quantized bit stream using a first quantization step to generate a first description of compressed data, wherein the first quantization step is determined based on a first required scaling of the reference quantization step.
- 5. The apparatus of claim 4, further comprising:
means for re-quantizing the quantized bit stream using a second quantization step to generate a second description of compressed data, wherein the second quantization step is determined based on a second required scaling of the reference quantization step.
- 6. The apparatus of claim 4, wherein the means for generating the quantized bit stream comprises:
means for using as the reference quantization step a quantization step for generating an archival compressed bit stream.
- 7. Apparatus for generating multiple descriptions of compressed data, comprising:
a transform module configured to generate transform coefficients from input data; a quantization module coupled to the transform module, the quantization module configured to quantize the transform coefficients using a reference quantization step and to re-quantize the quantized transform coefficients using different quantization steps to generate multiple descriptions of compressed data, wherein each of the different quantization step is determined based on a required scaling of the reference quantization step.
- 8. The apparatus of claim 7, wherein the quantization module comprises:
a first quantization module configured to quantize the transform coefficients using the reference quantization step; and a second quantization module configured to re-quantize the quantized transform coefficients using the different quantization steps.
- 9. A method for generating compressed data comprising:
accessing a quantized bit stream generated using a reference quantization step; and re-quantizing the quantized bit stream using a first quantization step to generate a first description of compressed data, wherein the first quantization step is determined based on a first required scaling of the reference quantization step.
- 10. The method of claim 9, further comprising:
re-quantizing the quantized bit stream using a second quantization step to generate a second description of compressed data, wherein the second quantization step is determined based on a second required scaling of the reference quantization step.
- 11. Apparatus for generating compressed data comprising:
means for accessing a quantized bit stream generated using a reference quantization step; and means for re-quantizing the quantized bit stream using a first quantization step to generate a first description of compressed data, wherein the first quantization step is determined based on a first required scaling of the reference quantization step.
- 12. The apparatus of claim 11, further comprising:
means for re-quantizing the quantized bit stream using a second quantization step to generate a second description of compressed data, wherein the second quantization step is determined based on a second required scaling of the reference quantization step.
- 13. Apparatus for generating compressed data comprising:
a storage medium configured to store a quantized bit stream generated using a reference quantization step; and a quantization module coupled to the storage medium and configured to re-quantize the quantized bit stream using different quantization steps to generate multiple descriptions of compressed data, wherein each of the different quantization step is determined based on a required scaling of the reference quantization step.
- 14. The apparatus of claim 13, wherein the storage medium is configured to store an archival compressed bit stream as the compressed bit stream.
- 15. A method for generating multiple descriptions of compressed data, comprising:
generating a quantized bit stream using a reference quantization step; encoding the quantized bit stream; decoding the encoded quantized bit stream; and re-quantizing the decoded quantized bit stream using a first quantization step to generate a first description of compressed data, wherein the first quantization step is determined based on a first required scaling of the reference quantization step.
- 16. The method of claim 15, further comprising:
re-quantizing the decoded quantized bit stream using a second quantization step to generate a second description of compressed data, wherein the second quantization step is determined based on a second required scaling of the reference quantization step.
- 17. The method of claim 15, wherein generating the quantized bit stream comprises:
using as the reference quantization step a quantization step for generating an archival compressed bit stream.
- 18. The apparatus for generating multiple descriptions of compressed data, comprising:
means for generating a quantized bit stream using a reference quantization step; means for encoding the quantized bit stream; means for decoding the encoded quantized bit stream; and means for re-quantizing the decoded quantized bit stream using a first quantization step to generate a first description of compressed data, wherein the first quantization step is determined based on a first required scaling of the reference quantization step.
- 19. The apparatus of claim 18, further comprising:
means for re-quantizing the decoded quantized bit stream using a second quantization step to generate a second description of compressed data, wherein the second quantization step is determined based on a second required scaling of the reference quantization step.
- 20. Apparatus for generating multiple descriptions of compressed data, comprising:
a quantization module configured to generate a quantized bit stream using a reference quantization step; a coding module coupled to the quantization module and configured to encode the quantized bit stream; and a decoding module configured to decode the encoded quantized bit stream; wherein the quantization module is configured to re-quantize the decoded quantized bit stream using different quantization steps to generate multiple descriptions of compressed data, wherein each of the quantization step is determined based on a required scaling of the reference quantization step.
- 21. The apparatus of claim 20, wherein the quantization module comprises:
a first quantization module configured to generate the quantized bit stream using the reference quantization step; and a second quantization module configured to re-quantize the decoded quantized bit stream using the different quantization steps to generate the multiple descriptions of compressed data.
- 22. A method for generating compressed data based on encoded quantized bit steam, comprising:
accessing compressed bit stream generated by quantization using a reference quantization step; decoding compressed bit stream to generate decoded quantized bit stream; and re-quantizing the decoded quantized bit stream using a first quantization step to generate a first description of compressed data, wherein the first quantization step is determined based on a first required scaling of the reference quantization step.
- 23. The method of claim 22, further comprising:
re-quantizing the decoded quantized bit stream using a second quantization step to generate a second description of compressed data, wherein the second quantization step is determined based on a second required scaling of the reference quantization step.
- 24. The method of claim 22, wherein accessing the compressed bit stream comprises:
accessing an archival compressed bit stream generated using as the reference quantization step a quantization step for generating an archival compressed bit stream.
- 25. Apparatus for generating compressed data based on encoded quantized bit steam, the apparatus comprising:
means for accessing compressed bit stream generated by quantization using a reference quantization step; means for decoding compressed bit stream to generate decoded quantized bit stream; and means for re-quantizing the decoded quantized bit stream using a first quantization step to generate a first description of compressed data, wherein the first quantization step is determined based on a first required scaling of the reference quantization step.
- 26. The apparatus of claim 25, further comprising:
means for re-quantizing the decoded quantized bit stream using a second quantization step to generate a second description of compressed data, wherein the second quantization step is determined based on a second required scaling of the reference quantization step.
- 27. Apparatus for generating multiple descriptions of compressed data based on encoded quantized bit steam, the apparatus comprising:
a storage medium configured to store a compressed bit stream generated by quantization using a reference quantization step; a decoding module configured to decode the compressed bit stream; and a quantization module configured to re-quantize the decoded compressed bit stream using different quantization steps to generate multiple descriptions of compressed data, wherein each of the quantization step is determined based on a required scaling of the reference quantization step.
- 28. The apparatus of claim 27, wherein the storage medium is configured to store an archival compressed bit stream as the compressed bit stream.
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims the benefit of U.S. Provisional Patent Application Serial No. 60/426,887, filed Nov. 15, 2002, which is incorporated herein by reference in their entirety.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60426887 |
Nov 2002 |
US |