TW376655B - Method for multi state variable length coding of multi zoned quantized DCT coefficients and apparatus therefor - Google Patents
Method for multi state variable length coding of multi zoned quantized DCT coefficients and apparatus thereforInfo
- Publication number
- TW376655B TW376655B TW087111972A TW87111972A TW376655B TW 376655 B TW376655 B TW 376655B TW 087111972 A TW087111972 A TW 087111972A TW 87111972 A TW87111972 A TW 87111972A TW 376655 B TW376655 B TW 376655B
- Authority
- TW
- Taiwan
- Prior art keywords
- state
- zone
- coefficients
- variable length
- indicates
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T9/00—Image coding
- G06T9/005—Statistical coding, e.g. Huffman, run length coding
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Abstract
The blocks of coefficients are divided into a plurality of zones best fitting the energy distribution of the transform. The coefficients in these zones are then group into triplets comprising of run, level and next symbols. The run symbol indicates the number of consecutive zero coefficients prior to the non-zero coefficients in the scanning order. The level indicates the value of the non-zero coefficient. The next symbol indicates the state of the zone. Each zone has a plurality of states. These states are classified based on the subsequent coefficients in the scan. A separate table is designed for the entropy coding of the triplets in each of the state. Depending on the state of the zone, the approximate table to use for the variable length coding of the next triplet. Since the state of the zone, the appropriate table for use for the variable length coding of the next triplet. Since the state of the zone prior to the decoding of the first triplet is unknown, it is necessary to insert into the bitstream a symbol that indicates the initial state of the zones, which is the initial State Pattern. The Initial State Pattern indicates the state and the table to be used for the decoding of the first triplet in each zone.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23165697 | 1997-07-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
TW376655B true TW376655B (en) | 1999-12-11 |
Family
ID=16926922
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW087111972A TW376655B (en) | 1997-07-23 | 1998-07-22 | Method for multi state variable length coding of multi zoned quantized DCT coefficients and apparatus therefor |
Country Status (2)
Country | Link |
---|---|
TW (1) | TW376655B (en) |
WO (1) | WO1999005649A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7664176B2 (en) * | 2004-07-09 | 2010-02-16 | Nokia Corporation | Method and system for entropy decoding for scalable video bit stream |
EP2383920B1 (en) | 2007-12-20 | 2014-07-30 | Optis Wireless Technology, LLC | Control channel signaling using a common signaling field for transport format and redundancy version |
US9172963B2 (en) | 2010-11-01 | 2015-10-27 | Qualcomm Incorporated | Joint coding of syntax elements for video coding |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2252002B (en) * | 1991-01-11 | 1995-01-04 | Sony Broadcast & Communication | Compression of video signals |
US5369405A (en) * | 1992-05-19 | 1994-11-29 | Goldstar Co., Ltd. | Coefficient generation apparatus for variable length decoder |
US5461422A (en) * | 1994-05-23 | 1995-10-24 | Industrial Technology Research Institute | Quantizer with automatic pre-threshold |
US6101282A (en) * | 1995-06-22 | 2000-08-08 | Canon Kabushiki Kaisha | Apparatus and method for image data encoding |
US5790706A (en) * | 1996-07-03 | 1998-08-04 | Motorola, Inc. | Method and apparatus for scanning of transform coefficients |
-
1998
- 1998-07-22 TW TW087111972A patent/TW376655B/en active
- 1998-07-23 WO PCT/JP1998/003290 patent/WO1999005649A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
WO1999005649A1 (en) | 1999-02-04 |
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