Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1992-04-27
1995-11-21
Hjerpe, Richard
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345153, G09G 500
Patent
active
054691885
ABSTRACT:
A method of pre-analyzing video signals obtained from a digital image stores the digital image in a frame buffer store in a specified video digital format. The amplitude, saturation and frequency of the stored digital image when converted into another video format, such as RGB or composite broadcast video, are each analyzed independently to identify areas of the stored digital image that might produce distortions in the final video format when displayed. Amplitude analysis is accomplished by converting the stored digital image into an RGB image, and each component is compared with predetermined limits to detect amplitude errors. Saturation analysis is accomplished by generating a saturation signal from the chrominance components of the stored digital image, and then comparing a function of the saturation signal with predetermined limits to detect oversaturation errors. Frequency analysis is accomplished by appropriately filtering each component of the stored digital image to pass only frequencies for that component that are not allowed in the target video format, and then detecting the occurrence of significant frequency values outside the filter frequency range as frequency errors. A display of the stored digital image, of appropriate waveforms related to the selected analysis function, and of discrete count values provides information to allow for interaction with an operator.
REFERENCES:
patent: 4257063 (1981-03-01), Loughry et al.
patent: 4775857 (1988-10-01), Staggs
patent: 4901009 (1990-02-01), Schultze et al.
Brown Gary L.
Bryant Ronald W.
Cone Kenneth F.
Krishnamurthy Suresh
McCormick Robert A.
Gray Francis I.
Hjerpe Richard
Tektronix Inc.
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