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Technology Stocks : C-Cube

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To: John Rieman who wrote (35124)	8/11/1998 2:58:00 PM
From: BillyG	Read Replies (1) of 50808

Microsoft patent related to filtering prior to digital video compression. patents.ibm.com 5787203 : Method and system for filtering compressed video images INVENTORS: Lee; Ming-Chieh, Bellevue, WA Gu; Chuang, Redmond, WA ASSIGNEES: Microsoft Corporation, Redmond, WA ISSUED: July 28, 1998 FILED: Jan. 19, 1996 SERIAL NUMBER: 588056 ABSTRACT: A video compression error signal in a video compression scheme is affected by random and high frequency impulse noise. An error signal suppressor containing two filters is applied to the video compression error signal. The first filter reduces or eliminates random noise. The second filter eliminates high frequency impulse noise. Random and high frequency noise is reduced or eliminated from frequencies that are unimportant to human visual perception. The error signal suppressor reduces the overall video compression bitrate by up to between 10% and 20% which provides corresponding increases in video compression and transmission efficiency. The error signal suppressor is used in video compression encoding schemes such as MPEG to reduce random and high frequency noise. we claim: 1. A video compression filtering method for a video compression error signal, the error signal including the differences between the representations of an actual and approximate video object, the method comprising: applying a random noise filter to said video compression error signal to form a first filtered error signal with reduced random noise; applying an impulse noise filter to said first filtered error signal to form a second filtered error signal with reduced high frequency impulse noise; and using the second filtered error signal in a video compression encoding scheme.

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