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Home I/O Systems Conversion-of-multilevel-digital-data-to-binary-data

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Details
Inventors: Suzuki, Kazuhiro; Murayama, Noboru;
Assignee: Ricoh Company, Ltd. (JP)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:

A system for converting a multilevel video signal into a binary video signal for use in an image processing machine such as a facsimile machine or digital copier includes a threshold setting circuit which first determines average density levels of a predetermined number of scanning lines and then a digitally weighted average of these average density levels, said digitally weighted average being used as a threshold for the binary conversion processing.

DETAILED DESCRIPTION The above-described disadvantages of the prior art are overcome with the present invention and an improved system for converting a multilevel digital video signal into a binary video signal is provided.
In accordance with the present invention, among a plurality of scanning lines, including the current scanning line and other scanning lines in its vicinity, to obtain a binary video signal therefrom, predetermined two or more scanning lines are selected to obtain a weighted average in video signal level.
Using the thus obtained weighted average or the weighted average multiplied by a certain proportionality constant as a threshold level for binary conversion, a multilevel video signal is converted into a binary video signal.
Therefore, it is a primary object of the present invention to provide an improved system for converting a multilevel video signal, analog or digital, into a binary video signal.
Another object of the present invention is to provide a binary video signal conversion system which is minimized in losing information during binary conversion.
A further object of the present invention is to provide a system for converting a multilevel video signal into a binary video signal which is least susceptible to the density level of the background of an original being scanned.
A still further object of the present invention is to provide a system for converting a multilevel video signal into a two-valued video signal without losing information for thin or pale lines.
Other objects, advantages and novel features of the present invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings.



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