SYSTEMS AND METHODS USING PARAMETER SELECTION IN DATA COMPRESSION AND DECOMPRESSION

• US 20070248274A1
• Filed: 05/22/2007
• Published: 10/25/2007
• Est. Priority Date: 07/30/2002
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: LaRocca, Judith, Govindaswamy, Senthil, Levin, Jeff
• Granted Patent: US 7,593,582 B2
• Time in Patent Office: Days
• US Class Current: 382/240
• CPC Class Codes: G06T 9/005 Statistical coding, e.g. Huffman, run length coding
• CPC Class Codes: H04N 19/122 Selection of transform size, e.g. 8x8 or 2x4x8 DCT; Selection of sub-band transforms of varying structure or type
• CPC Class Codes: H04N 19/124 Quantisation
• CPC Class Codes: H04N 19/157 Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/182 the unit being a pixel
• CPC Class Codes: H04N 19/61 in combination with predictive coding

Abstract

Apparatus, systems and methods for using the selection of an appropriate parameter at decompression are disclosed. In particular, when adaptive block size discrete cosine transform compression is used to compress data, different combinations of sub-blocks can be generated. To decompress the different combinations of sub-blocks, the appropriate parameter is selected based on block size assignment information and the address of data in the data block.

Claims

1. A method comprising:

displaying decompressed image information; and

decompressing compressed image information into the decompressed image information, the decompressing including;

decoding an address of data within a variable length decoded data block into Y and X indices based on a Y and X index system;

selecting a quantization parameter based at least on block size assignment information and the decoded address of the data within the variable length decoded data block; and

inverse quantizing the variable length decoded data block using the selected quantization parameter.

2. The method of claim 1, further comprising playing decompressed audio information.

3. An apparatus comprising:

means for displaying decompressed image information; and

means for decompressing compressed image information into the decompressed image information, the means for decompressing including;

means for decoding an address of data within a variable length decoded data block into Y and X indices based on a Y and X index system;

means for selecting a quantization parameter based at least on block size assignment information and the decoded address of the data within the variable length decoded data block; and

means for inverse quantizing the variable length decoded data block using the selected quantization parameter.

4. The apparatus of claim 3, further comprising means for playing decompressed audio information.

5. An apparatus comprising:

at least one projector configured to display decompressed image information; and

a decoder coupled to at least the at least one projector, the decoder configured to;

decode an address of data within a variable length decoded data block into Y and X indices based on a Y and X index system;

select a quantization parameter based at least on block size assignment information and the decoded address of the data within the variable length decoded data block; and

inverse quantize the variable length decoded data block using the selected quantization parameter.

6. The apparatus of claim 5, further comprising at least one sound system configured to play decompressed audio information.

7. A computer-readable medium encoded with a computer program, the computer program embodying executable instructions, the executable instructions comprising:

instructions to display decompressed image information; and

instructions to decompress compressed image information into the decompressed image information, the instructions to decompress including;

instructions to decode an address of data within a variable length decoded data block into Y and X indices based on a Y and X index system;

instructions to select a quantization parameter based at least on block size assignment information and the decoded address of the data within the variable length decoded data block;

instructions to inverse quantize the variable length decoded data block using the selected quantization parameter.

8. The computer-readable medium of claim 7, further comprising instructions to play decompressed audio information.