Image processing apparatus including binary data producing unit

Details Image processing apparatus including binary data producing unit Image processing apparatus including binary data producing unit

1990-04-24

1993-01-26

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

35821311, 358448, 358466, 358483, H04N 104

Patent

active

051826577

ABSTRACT:
An image data processing apparatus binary-codes an image signal obtained from an image sensor of the CCD type or the like so as to output a binary-coded image signal. The image signal obtained from the image sensor A/D-converted into digital image data. Based upon the digital image data, average values of luminance values of the digital image data are calculated for an array of pixels in a preselected area of the CCD. This average value is used as a threshold level for binary coding the image data for these pixels at the center portion of this preselected area. Furthermore, to detect coutours this data processing apparatus calculates a gradient in the luminance values of the pixels in a portion of the preselected area of the CCD in an X direction and a Y direction, and the gradient value is used to obtain binary-coded data in accordance with the above-described method.

REFERENCES:
patent: 4841374 (1989-06-01), Kotani et al.
patent: 4908875 (1990-03-01), Assael et al.

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