Television – Special applications – Film – disc or card scanning
Patent
1995-04-07
1997-09-09
Britton, Howard W.
Television
Special applications
Film, disc or card scanning
348241, 348106, 386 5, 386110, H04N 338, H04N 5253, H04N 911
Patent
active
056661568
ABSTRACT:
A system and method to improve the quality of reproduced images on a film to video transfer device by scanning extra lines to reduce vertical aliasing and performing vertical sample rate reduction to produce the correct number of video output lines High frequency noise is reduced as a result of the vertical sample rate reduction which produces a line filtering. More lines are scanned than normal and the distance between lines is reduced so that the larger number of lines covers the original film image area. This has the effect of increasing the sampling frequency in the vertical direction and therefore reducing aliasing. To provide the correct number of lines in the output of the film to video sample, rate reduction is performed. Sample rate reduction is performed by filtering multiple adjacent lines to remove any high frequency content that would be aliased at the lower rate. Lines are discarded in a predefined sequence that is a function of the fractional reduction rate.
REFERENCES:
patent: 3886589 (1975-05-01), Nasu
patent: 4133009 (1979-01-01), Kittler
patent: 4298896 (1981-11-01), Heitmann
patent: 4823204 (1989-04-01), Holland
patent: 5159437 (1992-10-01), Lee
patent: 5179314 (1993-01-01), Walker
Spears Steven
Walker David
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