Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1977-05-18
1979-06-19
Murray, Richard
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358138, H04N 712
Patent
active
041588568
ABSTRACT:
A technique for converting video information into sequences of digital words in a form which can be readily accepted by a computer. The generated digital words exclude some information content of the video signals which is not necessary for certain pattern recognition and control purposes. In accordance with the preferred embodiment of the invention, there is provided a clock having a rate which is in synchronism with the video line and field information. A comparator is provided for comparing the video signals to a prescribed standard and for generating digital indications as a function of the comparisons. Each digital indication is preferably a binary bit which indicates whether the compared video signal is above or below the prescribed threshold. Means, synchronized with the clock rate, are provided for serially accumulating a predetermined number of successive digital indications. Finally, means are provided for reading out each group of accumulated digital indications. In an embodiment of the invention, means are provided for detecting the nature of digital indications over a given period, for example one field. The detected value is then used for modifying the prescribed standard.
REFERENCES:
patent: 3980809 (1976-09-01), Cook
Murray Richard
Novack Martin M.
Sangamo Weston, Inc.
Sherman William R.
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