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US 5,396,343 AGranted
Image compresssion systems with optimized data access
AssigneeNEC Electronics Corporation
InventorEric G. Hanselman
Life of this patent
Estimating the term…
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.
Claims1
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.
7 more elements
Dependencies are inferred from the claim text.