US4916544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device for compression by the conditional encoding of digital image signals without loss of data
Assignee: General Electric CGR SA
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Filing: 1986-12-02
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Granted: 1990-04-10
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Expires: 2006-12-02
Abstract
Abstract To compress the values of the pixels of a digitalized image, the values of the pixels neighboring the pixel to be processed are memorized and, according to their respective values, a code number is produced leading to the encoding process according to a composed code or to the encoding of the pixel itself, with a prefix. The successive codes are formatted and concatenated to be memorized.
Inventors
- 👤 Jean Lienard
- 👤 Claude Benchimol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:46
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/90
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
67 words
A device for the compression of digital image signals by conditional encoding without loss of data, comprising a shift memory with at least two outputs at which, for each incoming pixel value, the values of the neighbouring values are presented, these outputs being each connected to a memory giving a code number, these two memories being connected to a device for the formatting and concatenation of codes.
Claim 2
Independent Claim
67 words
A device for the compression of digital image signals by conditional encoding without loss of data, comprising a shift memory with at least two outputs at which, for each incoming pixel value, the values of the neighbouring values are presented, these outputs being each connected to a memory giving a code number, these two memories being connected to a device for the formatting and concatenation of codes.
Claim 3
Dependent Claim
74 words
A device according to the claim 1 wherein the code number memories are also linked to the command input of a multiplexer through another memory, one of the inputs of the multiplexer receiving the incoming pixel values and the other receiving a value ##EQU7## which is a function of the difference between the incoming pixel values and the neighbouring pixel values, the output of this multiplexer being also connected to a compressed codes memory.
Claim 4
Independent Claim
72 words
A device according to any of the claims 1 or 2, wherein the formatting device comprises two series-connected registers, the parallel input of the first register being connected to the compressed codes memory and the parallel output of the second register being connected to a bulk memory, the clock signal inputs of these two registers being connected to a clock controlled by a controller connected to the output of the codes memory.
Claim 5
Independent Claim
40 words
A device according to any of claims 1 or 2 further comprising a modification means for modifying connections of said shift memory, said code number memories and said formatting device whereby data stored in the bulk memory can be decoded.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-09 | 1993-10-09 | 1994-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-09 | 1997-10-09 | 1998-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-09 | 2001-10-09 | 2002-04-10 | $7700.00 | Window Closed / Lapsed |