Method and apparatus for low frequency removal in vector quantiz

Details Method and apparatus for low frequency removal in vector quantiz Method and apparatus for low frequency removal in vector quantiz

1991-11-19

1993-08-10

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

375 27, H04N 713

Patent

active

052354180

ABSTRACT:
A method and apparatus for low-frequency removal in vector quantization of an image frame. An image frame is converted to plurality of input vectors. A mean value of each input vector is determined and transmitted to a plurality of reception sites. A low-frequency component of each input vector is then determined and removed from the input vector. A scalar mean value of each low-frequency removed vector is then determined and subtracted therefrom to produce a residual vector. The residual vectors are then vector quantized and the vector quantized data is transmitted to the reception sites. At a reception site, the transmitted mean values and vector quantized data are received and each input vector is reproduced therefrom. From the reproduced input vectors, the image frame is recreated for display at the reception site.

REFERENCES:
patent: 4878230 (1989-10-01), Murakami
patent: 5086439 (1992-02-01), Asai
"Vector Quantization of Digital Images", Baker, Richard L., Stanford University-University Microfilms International, UMI Dissertation Information Service (Copyright 1984).
"Vector Quantization", Gray, Robert M., The Institute of Electrical and Electronics Engineers, Inc., ASSP Mag., vol. 1, pp. 4-29, Apr. 1984.
"Interpolative Vector Quantization of Color Images", Hang, Hsueh-Ming and Haskell, Barry G., IEEE Transactions on Communications, vol. 36, No. 4, Apr. 1988.
"A Finite State/Frame Difference Interpolative Vector Quantizer for Low Rate Image Sequence Coding", Shen, Hsiao-hui, et al., Proc. IEEE Int. Conf. Acoust., Speech, Signal Processing, vol. 2, pp. 1188-1191, Apr. (1988).

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