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Title: Image compression/decompression based on mathematical transform, reduction/expansion, and image sharpening

An image represented in a first image array of pixels is first decimated in two dimensions before being compressed by a predefined compression algorithm such as JPEG. Another possible predefined compression algorithm can involve a wavelet technique. The compressed, reduced image is then transmitted over the limited bandwidth transmission medium, and the transmitted image is decompressed using an algorithm which is an inverse of the predefined compression algorithm (such as reverse JPEG). The decompressed, reduced image is then interpolated back to its original array size. Edges (contours) in the image are then sharpened to enhance the perceptual quality of the reconstructed image. Specific sharpening techniques are described.
Inventors:
 [1];  [2]
  1. (San Francisco, CA)
  2. (Livermore, CA)
Issue Date:
OSTI Identifier:
871301
Assignee:
Regents of University of California (Oakland, CA) LLNL
Patent Number(s):
US 5703965
Contract Number:
W-7405-ENG-48
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
image; compression; decompression; based; mathematical; transform; reduction; expansion; sharpening; represented; array; pixels; decimated; dimensions; compressed; predefined; algorithm; jpeg; involve; wavelet; technique; reduced; transmitted; limited; bandwidth; transmission; medium; decompressed; inverse; reverse; interpolated; original; size; edges; contours; sharpened; enhance; perceptual; quality; reconstructed; specific; techniques; described; transmission medium; limited bandwidth; reconstructed image; image array; image compression; /382/

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