Methods and apparatus for compression of transform data
US7006696B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 27, 2003 |
| Grant date | Feb 28, 2006 |
| Priority date | — |
| Expiry date | Sep 1, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/6377
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A compression technique, for use in a network environment, compresses transform data to improve transmission rates in low bandwidth applications. The source data is decomposed into transform data that consists of spatially related coefficients. In a client-server environment, a client issues a request, which defines a block of the coefficients and at least one quantization value, for source data. In response to the client request, the server extracts transform data defined by the request. The transform data is quantized, in accordance with the quantization value, and is compressed to generate compressed data. The server transfers the compressed data to the client. The client decompresses the compressed data to obtain quantized data, and de-quantizes the quantized data to recover the transform data. The client then reconstructs the original source data from the transform data. Techniques for transmitting to the client incremental data, for use in conjunction with cached data, is disclosed. The use of the compression techniques for images in a medical informatics system is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.