Invalidity dossier
US 8781001B2
Added 10/28/2026, 12:01:06 PM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview: US8781001B2 (concise, based only on the supplied excerpt)
Title: Image coding method, image coding apparatus, image decoding method and image decoding apparatus
Key bibliographic data (per the source page):
- Patent number: US8781001B2; application US13/669,733; also published as US20130148742A1
- Filing date: 2012-11-06; publication date (grant): 2014-07-15
- Priority date: 2011-11-07 (listed as an assumption, not a legal conclusion)
- Inventors: Hisao Sasai, Takahiro Nishi, Youji Shibahara, Toshiyasu Sugio, Kyoko Tanikawa, Toru Matsunobu, Kengo Terada
- Original assignee: Panasonic Corp; current assignee listed: Tagivan II LLC
- Classification example: H04N19/13 (adaptive entropy coding, e.g. CABAC); also H04N19/91 (entropy coding) and H04N19/46
- Legal status listed: Active, adjusted expiration 2033-01-24 (described as an assumption)
Purpose: The disclosure concerns image coding/decoding using arithmetic coding. Specifically, in coding quantized transform coefficients, a current block's coefficients are scanned in a set order and "last position information" (position of the last non-zero coefficient in that order) is binarized and coded via context-adaptive binary arithmetic coding. One stated aim is to code/decode this last position information using a context appropriately switched among multiple contexts.
Plain-language scope (from the quoted summary): A method for coding last position information includes: (1) binarizing it into either a binary signal with a first signal (length up to a predetermined maximum) and no second signal, or a first signal of the maximum length plus a second signal; (2) first coding that arithmetically codes each binary symbol of the first signal using a context switched by bit position; and (3) second coding that arithmetically codes the second signal using a fixed probability when present. In the first coding, the last bit position of the first signal is coded with a context exclusive to that position when the first signal has the maximum length.
Not established by this excerpt: The full claim set (only an excerpt of the summary is given); the full description, figures, and any prior-art discussion beyond the H.264/AVC and JCT-VC WD4 references mentioned; and any legal conclusions about scope, validity, or enforceability. Litigation, ownership transfers, validity, and prior art were not researched per instructions.
Source: https://patents.google.com/patent/[US8781001](/patent/US8781001)/en
Generated 10/28/2026, 12:01:14 PM
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Assignment history
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Prior art
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