Digital binarization circuit for conversion of image data

Details Digital binarization circuit for conversion of image data Digital binarization circuit for conversion of image data

1989-11-16

1992-11-24

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358464, 358466, H04N 140

Patent

active

051668084

ABSTRACT:
A digital binarization circuit for image data includes a background level detecting circuit which uses a video signal as a reference input for determining the background level of an image represented by the video signal, and outputs the background level as a first address signal. A character level detecting circuit compares the video signal with a character level in a load decision comparator and loads the video signal as a character level when the signal is less than the reference level, and outputs the character level as a second address signal. A memory circuit ouputs a threshold value stored at an address designated by the first and second address signals to a comparator. The optimum threshold value is outputted among prescribed threshold values stored in the memory circuit. The comparator compares the digitized video signal with the optimum threshold value and outputs a binary signal corresponding to the comparison result. Even for original documents with a dark background, noise is not liable to occur in the transmitted video signal, and a light character can appear clearly on the transmitted video signal.

REFERENCES:
patent: 4812667 (1989-03-01), Kobayashi et al.
patent: 4931881 (1990-06-01), Matsui et al.
European Search Report, Mar. 9, 1990.

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