Apparatus and method for image extraction with threshold adjustm

Details Apparatus and method for image extraction with threshold adjustm Apparatus and method for image extraction with threshold adjustm

1991-07-25

1993-11-23

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358500, 358527, H04N 146

Patent

active

052649466

ABSTRACT:
An image processing apparatus is provided with: at least one image memory for storing each picture element value of an original image; a coordinate inputting device by which a coordinate of an arbitrary point on the original image can be inputted; a device for setting a threshold according to the picture element value at the coordinate inputted by the coordinate inputting device; and a data buffer for successively storing the set threshold. The image processing apparatus is further provided with at least one look up table for converting each picture element value to either one color component data, which color indicates that the picture element value is within the region prescribed by the set threshold, or another color component data, which color indicates that the picture element value is outside the region prescribed by the set threshold, according to the set threshold, each time the threshold is set by the threshold setting device. The threshold setting device sets as a new threshold, a value between the currently set threshold and the previously set threshold, which has been set before the currently set threshold and stored in the data buffer, when canceling the currently set threshold.

REFERENCES:
patent: 4908875 (1990-03-01), Assael et al.
Patent Abstracts of Japan-corresponding to the references 1 to 3.

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