Image processing method and apparatus

Details Image processing method and apparatus Image processing method and apparatus

1996-12-04

1999-02-23

Coles, Edward L.

Facsimile and static presentation processing

Facsimile

Auxiliary signal

358432, 358427, 358450, 358451, 348403, 348404, 348384, 348581, 382232, 382250, 382248, 382298, H04N 1415, H04N 712

Patent

active

058750398

ABSTRACT:
When image data coded by a DCT coding method in a predetermined block size is to be decoded, an image processing apparatus extracts necessary DCT coefficients of a block on the basis of an enlargement/reduction ratio determined in advance, then decodes the extracted DCT coefficients. Thereby it is possible to produce a reduced image at high speed without using a memory of high capacity.

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IEEE Transactions On Communications, Apr. 1983, USA, vol. COM-31, No. 4 ISSN 0090-6778, pp. 532-540, Burt P J et al "The Laplacian Pyramid As A Compact Image Code".
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Patent Abstracts of Japan, vol. 018 No. 025 (M-1542), 14 Jan. 1994, & JP-A-05 261982 (Seiko Epson Corp) 12 Oct. 1993.
Patent Abstracts of Japan, vol. 018 No. 123 (E-1517), 28 Feb. 1994 & JP-A-05 316357 (Nippon Telegr & Teleph Corp) 26 Nov., 1993.
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, Jul. 1993, Japan, vol. E76-A, No. 7, ISSN 0916-8508 pp. 1150-1153, Muramatsu S et al. "Scale Factor of Resoluction Conversion Based On Orthogonal Transforms", p. 1150, right col. paragraph 3--p. 1151, left. col., paragraph 2.

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