Patent US5787203A successfully refreshed from Google Patents.
US5787203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and system for filtering compressed video images
Assignee: Microsoft Technology Licensing LLC
•
Filing: 1996-01-19
•
Granted: 1998-07-28
•
Expires: 2016-01-19
Abstract
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.
Inventors
- 👤 Ming-Chieh Lee
- 👤 Chuang Gu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:23
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/20; H04N19/23; H04N19/80
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
89 words
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.
Claim 2
Dependent Claim
89 words
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.
Claim 3
Dependent Claim
14 words
The method of claim 1 where the random noise filter includes a threshold filter.
Claim 4
Dependent Claim
15 words
The method of claim 1 where the impulse noise filter includes a cross-shaped median filter.
Claim 5
Dependent Claim
17 words
The method of claim 3 where the cross-shaped median filter is a five pixel cross-shaped median filter.
Claim 6
Dependent Claim
12 words
The method of claim 1 where the object is of arbitrary configuration.
Claim 7
Dependent Claim
104 words
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: 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.
Claim 8
Dependent Claim
104 words
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: 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.
Claim 9
Dependent Claim
43 words
The method of claim 6 where applying a predetermined error threshold filter to the video compression error signal includes setting said video compression signal to magnitude zero whenever said video compression error signal is of a magnitude less than said predetermined error threshold.
Claim 10
Dependent Claim
14 words
The method of claim 6 where the median filter includes a cross-shaped median filter.
Claim 11
Dependent Claim
17 words
The method of claim 8 where the cross-shaped median filter is a five pixel cross-shaped median filter.
Claim 12
Dependent Claim
29 words
The method of claim 6 where the plural pixels have luminance and chromaticity values and median pixel values are determined with respect to the pixel luminance and chromaticity values.
Claim 13
Dependent Claim
26 words
The method of claim 6 where plural pixels have RGB color coordinate values and median pixel values are determined with respect to RGB color coordinate values.
Claim 14
Dependent Claim
12 words
The method of claim 6 where the object is of arbitrary configuration.
Claim 15
Dependent Claim
19 words
A computer readable medium having stored therein instructions for causing a computer to execute the method of claim 1.
Claim 16
Dependent Claim
19 words
A computer readable medium having stored therein instructions for causing a computer to execute the method of claim 6.
References Cited (Backward Citations)
US3873971A
Cited
US4751742A
Cited
US4754492A
Cited
US4802005A
Cited
US4745633A
Cited
US5070465A
Cited
US4912549A
Cited
EP0395293A1
Cited
US5067014A
Cited
WO1991011782A1
Cited
US5214504A
Cited
US5148497A
Cited
US5117287A
Cited
US5103306A
Cited
US4999705A
Cited
US5155594A
Cited
US5086477A
Cited
US5020121A
Cited
EP0474307A2
Cited
EP0497586A2
Cited
US5258836A
Cited
US5251030A
Cited
US5294979A
Cited
US5295201A
Cited
US5376971A
Cited
US5467442A
Cited
US5424783A
Cited
EP0614318A2
Cited
EP0625853A2
Cited
US5598215A
Cited
US5459519A
Cited
US5517327A
Cited
US5572258A
Cited
US5574572A
Cited
US5621660A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-07-27 | 2002-01-26 | 2002-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-07-27 | 2006-01-26 | 2006-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-07-27 | 2010-01-26 | 2010-07-28 | $7700.00 | Window Closed / Lapsed |