Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-03-07
1991-05-28
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358167, H04N 5208, H04N 5213
Patent
active
050199080
ABSTRACT:
In a digital image processing system, an A/D converter digitizes an input analog 2-field (i.e. 525 lines NTSC) video signal into first and second digital video field data components of a digital video frame, and the data of the first and second fields is stored in an image memory. Under control command, the first digital video field data is read-out of the image memory, switched to a data output and D/A converted into a first analog video field for supplying the first field component of an analog video still frame, and simultaneously the first digital video field data is also stored in a field memory. The second digital video field data is then read-out of the image memory into one input of an adder while the first digital video field data is read-out of the field memory into another input of the adder, whereby the first and second digital field data is digitally summed, then passed through a divider to provide the digital average of the data of the first and second digital video fields. The averaged digital video field data is then switched to the data output and D/A converted for supplying the second field component of a 2-field analog video still/freeze frame. Flicker due to relative motion occurring between the two fields of the input analog video frame is reduced by one-half in the output analog video frame due to the digitally performed averaging operation, providing an improved still/freeze frame video picture.
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Bushnell Robert E.
Chin Tommy P.
Samsung Electronics Co,. Ltd.
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