Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-10-11
1990-07-10
Peng, John K.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358135, 358105, 382 56, H04N 701, H04N 712, H04N 718
Patent
active
049410458
ABSTRACT:
Scan conversion apparatus for improving the vertical resolution of a television image for display comprises a field store for storing the previously transmitted field and a line store for storing video data representative of the previous line including the most recent picture element. In an interlaced system, the two vertically adjacent picture elements and the intermediate picture element transmitted in the previous field are used to provide five selectable values. The video data is also tested in accordance with three tests comprising a rank ordering test, a vertically sharp transition test and a motion test. According to the results of these tests, one of the five alternative values is chosen as an interpolated value for display with the vertically adjacent values for the currently transmitted field. The selection process may be assisted by the provision of an auxiliary signal indicative of the probability of motion of a predetermined block of data.
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"Theoretical and Subjective Comparison of Flicker-Reduction Methods", EBU Review-Technical, No. 222, Apr. 1987, pp. 70-79.
Peng John K.
Scientific-Atlanta, Inc.
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