Solid state image scanning system for producing a binary output

Details Solid state image scanning system for producing a binary output Solid state image scanning system for producing a binary output

1977-12-30

1979-11-06

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358163, 358221, H04N 314, H04N 514

Patent

active

041737725

ABSTRACT:
An image scanning system which alternately illuminates a charge transfer device with a focused, then defocused image of a line at a time of a document in order to provide comparison signals for binarization of the image concurrent with cancellation of dark current and sensitivity variations. The system includes focus-defocus, variable optical path length optical elements which are operated at a reduced speed by processing a line array at a time instead of a single picture element at a time in the image. A single charge transfer device chip comprises the scanner array, and includes a simple analog line memory comprised of light responsive elements, shift registers, gates, and a 1-bit comparator to perform the binarization. The charge transfer devices may be comprised of charge coupled devices (CCD) or bucket brigade devices (BBD) building blocks.

REFERENCES:
patent: 4065788 (1977-12-01), Meier et al.

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