Image compression/decompression based on mathematical transform,

Details Image compression/decompression based on mathematical transform, Image compression/decompression based on mathematical transform,

1995-06-06

1997-12-30

Boudreau, Leo

Image analysis

Image compression or coding

382266, 382299, 382300, G06K 936, G06K 946

Patent

active

057039658

ABSTRACT:
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.

REFERENCES:
patent: 4718104 (1988-01-01), Anderson
patent: 4776029 (1988-10-01), Shimura
patent: 4817174 (1989-03-01), Nakatani
patent: 4829378 (1989-05-01), LeGall
patent: 5422964 (1995-06-01), Devimeux et al.
patent: 5491761 (1996-02-01), Kim
Yang et al., "Regularized reconstruction to reduce blocking artifacts of block discrete costume transform compressed images" IEEE Trans. Circuits Syst. Video Technol., vol. 3, No. 6, pp. 421-432, Dec. 1993.

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