Method and system for filtering compressed video images
First 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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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.
216 Citations
14 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 13)
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6. A compression filtering method for a video compression error signal, the video compression error signal representing differences between representations of an actual object and an approximate object, the method comprising:
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applying a predetermined error threshold filter to the video compression error signal to form a first filtered video compression error signal; identifying a group of plural pixels representing said first filter video compression error signal; applying a median filter to said group of plural pixels to determine a median pixel value; and assigning said median pixel value to each of the pixels in said group of plural pixels to form a modified pixel group. - View Dependent Claims (7, 8, 9, 10, 11, 12, 14)
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Specification