Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-03-01
1993-12-28
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 10, 371 27, H04N 1700, H04N 1702, H04N 1704
Patent
active
052744450
ABSTRACT:
A three-dimensional test signal for a video codec is generated by injecting a conventional foreground test signal at a predetermined location as a foreground component within a background test signal as a background component, the background component having a variable complexity. The three-dimensional test signal is input to the video codec and the output of the video codec is measured using conventional measurement instruments. The background component may be a pseudo-random noise signal, a zone plate signal or other variable complexity-type signal, with the foreground component occurring at greater intervals than the neighboring pixels used by the codec compression algorithm. The conventional measurement instruments display only the foreground component with distortions in the video codec caused by the complexity of the background component appearing in the display. A spectral display of the output of the video codec using a zone plate signal as the background component may also be used to characterize the video codec performance.
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Overton Michael S.
Penney Bruce J.
Stevens Douglas C.
Gray Francis I.
Groody James J.
Lee Michael H.
Tektronix Inc.
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