Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1994-07-21
1995-08-22
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358448, H04N 140
Patent
active
054445531
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: 4194221 (1980-03-01), Stoffel
patent: 4554593 (1985-11-01), Fox et al.
patent: 4674126 (1987-06-01), Kotera
patent: 4841374 (1989-06-01), Kotani et al.
patent: 4908875 (1990-03-01), Assael et al.
Sano Teruo
Sato Takashi
Casio Computer Co. Ltd.
Coles Sr. Edward L.
Grant II Jerome
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