Method for estimating high frequency components in digitally com

Details Method for estimating high frequency components in digitally com Method for estimating high frequency components in digitally com

1996-09-09

1998-04-07

Coles, Sr., Edward L.

Image analysis

Image compression or coding

382233, 382244, 382248, 382251, 358432, 358433, H04N 1415

Patent

active

057374465

ABSTRACT:
A method for estimating high frequency components of a compressed image normally lost during a data compression stage and an encoder and a decoder for carrying out same. The image is compressed to obtain unquantized and quantized frequency domain coefficients. An inverse quantization is performed on the quantized coefficients to obtain lossy frequency domain coefficients. Loss characteristics of the high frequency components are then determined based on the unquantized frequency domain coefficients and the lossy frequency domain coefficients according to one of several methods. Finally, the loss characteristics are coded to obtain encoded loss data corresponding to the lost high frequency components.

REFERENCES:
patent: 4903317 (1990-02-01), Nishihara et al.
patent: 5109451 (1992-04-01), Aono
patent: 5327502 (1994-07-01), Katata et al.
patent: 5416604 (1995-05-01), Park
patent: 5497246 (1996-03-01), Abe

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