Image coding device and decoding device

Details Image coding device and decoding device Image coding device and decoding device

1993-10-19

1995-02-21

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 56, 358464, G06K 900

Patent

active

053923626

ABSTRACT:
An image coding device including a dividing circuit for dividing an input image signal into a plurality of image areas, a coding method deciding circuit for deciding a coding method for a target one of the image areas, a binary image coder for coding a binary image in the target image area to obtain a binary image code, a nonbinary image coder for coding a nonbinary image in the target image area to obtain a nonbinary image code, a character/background separating circuit for separating a character/background synthesized image in the target image area into a character portion and a background portion and supplying the character portion and the background portion to the binary image coder and the nonbinary image coder, respectively, and a control circuit for selectively operating the binary image coder and the nonbinary image coder according to a decision result from the coding method deciding circuit. Accordingly, the binary image in the target image area can be coded by a binary image coding method only to thereby reduce the number of bits for coding.

REFERENCES:
patent: 4750209 (1988-06-01), Shimura et al.
patent: 4856075 (1989-08-01), Smith
patent: 5073953 (1991-12-01), Westdijk
patent: 5109436 (1992-04-01), Machida et al.
Keith Gunn, "Compression of Images" workshop presented at Nat. Conf. & Expo on Electronic Imaging '90, Feb. 20-22, 1990. Wash., D.C. pp. 1-6 & D1-6.
Efficient Hybrid Coding Scheme for Color Facsimile, Katsuno et al., Electronic Information Communication Society Technical Report CS 91-96, 1991, pp. 13-20.

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