Method and apparatus for testing codec devices
AssigneeU S West Advanced Technologies, Inc.
InventorMarvin J. Straus
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Abstract
A video codec evaluation method and apparatus is provided that permits an objective evaluation of the performance of a codec. A plurality of motion graphics scenes, selected to test for specific motion artifacts, are stored on a video disc which is read by a video player and supplied to a codec under test. The evaluator views the graphic scenes as processed by the codec, on a monitor, and uses visual and audible scoring levels, that are incorporated on the disk, and associated with the graphic scene, to identify the onset or disappearance of motion artifacts and record a score for the test.
Claims18
A method of testing the ability of a codec to process data corresponding to a video scene that contains motion, comprising the steps of transmitting a test pattern which includes a moving video image of varying motion content and an accompanying audible scoring criteria, utilizing at least one codec for encoding and decoding the image, and displaying the image while concurrently reproducing the audible scoring criteria in order to provide a codec score at a time of occurrence of motion artifacts in a displayed image.
Apparatus for testing the performance of a codec comprising, playback means for reading audio and video signals from storage means and providing audio and video output signals, said storage means storing at least one test pattern of a motion graphic scene and an accompanying audible scoring criteria, codec means for processing said video output signals of said playback means, said codec means having a video input and a video output, means applying the video output signal of said playback means to the video input of said codec means, monitor means having audio and video inputs, means applying the video output of said codec means to the video input of said monitor means for displaying the video output of said codec means, means applying the audio output signal of said playback means to the audio input of said monitor means, whereby the production of motion artifacts during the processing of the test pattern may be correlated with a value from the scoring criteria.
Dependencies are inferred from the claim text.