US5396343A
Expired / Lapsed
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Image compresssion systems with optimized data access
Assignee: Renesas Electronics America Inc
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Filing: 1991-03-14
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Granted: 1995-03-07
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Expires: 2011-03-14
Abstract
Abstract An image compression system has an image memory accessible from the image bus. Compressed data are stored in a dual-ported memory accessible from both the image bus and the host bus. The compressor/expander accesses the image memory while the host accesses the dual-ported memory. Dual-ported memory allocation schemes and a computer program controlling the image compression system are also provided.
Inventors
- 👤 Eric G. Hanselman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:15
CPC Classifications
G; G06; G06T; G06T9/00; G06T1/00; G06T1/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A method of recompressing image data comprising the steps of: allocating a first buffer, a second buffer, a third buffer, and a fourth buffer in a storage device; writing first data compressed according to a first compression algorithm to said first buffer; writing the first compressed data to said second buffer; reading the first compressed data from said second buffer; converting the first compressed data to second compressed data compressed according to a second compression algorithm; writing the second compressed data to said third buffer; writing the second compressed data to said fourth buffer; and reading said second compressed data from said fourth buffer; wherein said steps of writing to said first buffer, reading from said second buffer, writing to said third buffer and reading from said fourth buffer proceed substantially in parallel.
Claim 2
Independent Claim
133 words
A method of recompressing image data comprising the steps of: allocating a first buffer, a second buffer, a third buffer, and a fourth buffer in a storage device; writing first data compressed according to a first compression algorithm to said first buffer; writing the first compressed data to said second buffer; reading the first compressed data from said second buffer; converting the first compressed data to second compressed data compressed according to a second compression algorithm; writing the second compressed data to said third buffer; writing the second compressed data to said fourth buffer; and reading said second compressed data from said fourth buffer; wherein said steps of writing to said first buffer, reading from said second buffer, writing to said third buffer and reading from said fourth buffer proceed substantially in parallel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-06 | 1998-09-05 | 1999-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-06 | 2002-09-05 | 2003-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-06 | 2006-09-05 | 2007-03-07 | $7700.00 | Window Closed / Lapsed |