Image forming apparatus which avoids copying insignificant infor

Details Image forming apparatus which avoids copying insignificant infor Image forming apparatus which avoids copying insignificant infor

1993-02-25

1996-03-12

Wong, Peter S.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358406, 358464, 355206, 382308, 382319, H04N 1387, H04N 138, G03G 2100, G06K 900

Patent

active

054991013

ABSTRACT:
An image forming apparatus includes an image memory section in an image processing section for temporarily storing an image signal read from an optical system via a photoelectric transducer section, an arithmetic section for numerical computation based on data stored in the image memory section, a decision section adapted to conclude that an image forming operation should be interrupted when a variation rate E of the image signal is lower than a threshold value T read from a ROM as a result of computation by the arithmetic section, and to conclude that the image forming operation should be continued when the variation rate E is equal to or higher than the threshold value T. A section is also provided for interrupting the image forming operation in response to a command from the decision section when there is no operator's key entry to order the interruption or execution of the image forming operation within a predetermined period of time.

REFERENCES:
patent: 4682158 (1987-07-01), Ito et al.
patent: 4831458 (1989-05-01), Watanabe
patent: 4839740 (1989-06-01), Yoshida
patent: 5138674 (1992-08-01), Sugawa
patent: 5268773 (1993-12-01), Park et al.
patent: 5270838 (1993-12-01), Mita
Patent Abstracts of Japan, vol. 13, No. 366 (E-806), 15 Aug. 1989, and JP-A-11 23 567, published May 16, 1989.
Yeskel, "Digital Image Processing Algorithm for High Frequency Information", IBM Technical Disclosure Bulletin, vol. 27, No. 7B, Dec. 1984, pp. 4288-4299.

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