Methods and apparatus for compression of transform data

Details Methods and apparatus for compression of transform data Methods and apparatus for compression of transform data

2006-02-28

2006-02-28

Mehta, Bhavesh M. (Department: 2621)

Image analysis

Image compression or coding

C709S247000

Reexamination Certificate

active

07006696

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.

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