Method and apparatus for reducing image distortion in an asynchr

Details Method and apparatus for reducing image distortion in an asynchr Method and apparatus for reducing image distortion in an asynchr

1992-04-09

1994-11-29

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Auxiliary signal

358447, 358486, H04N 104

Patent

active

053695046

ABSTRACT:
A method and apparatus for reducing the distortion of image signals captured by an asynchronous scanning system during a transient period caused by temporarily disabling the scanning operation. Where in during normal operation, the asynchronous scanning system drives a document to be scanned relative to a scanning array which produces image signals representative of the document. Subsequently, the signals are transmitted to a host through an interface at a rate which may exceed the reception rate of the host, the asynchronous operation of the scanning system being regulated by start and stop signals which, respectively, enable and disable the scanning operation. The method used for reducing the image signal distortion during the transient period includes storing the image signals for the scanline acquired by the scanning array prior to disabling the scanning operation and storing at least one scanline of image signals for the scanlines acquired by the scanning array subsequent to restarting the scanning operation. Subsequently, the stored image signals are interpolated to generate additional scanlines of corrected image signals to replace those scanlines lost or those distorted while the scanning system was operating in the transient state.

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