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

Patent ·
OSTI ID:871301
 [1];  [2]
  1. San Francisco, CA
  2. Livermore, CA
+ Show Author Affiliations
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.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
DOE Contract Number:
W-7405-ENG-48
Assignee:
Regents of University of California (Oakland, CA)
Patent Number(s):
US 5703965
OSTI ID:
871301
Country of Publication:
United States
Language:
English

References (1)

Regularized reconstruction to reduce blocking artifacts of block discrete cosine transform compressed images
  • Yang, Yongyi; Galatsanos, N. P.; Katsaggelos, A. K.
  • IEEE Transactions on Circuits and Systems for Video Technology, Vol. 3, Issue 6, p. 421-432 https://doi.org/10.1109/76.260198
journal December 1993

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