EP0540102A1
Expired / Lapsed
EP
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Arrangement for reducing artifacts in video signals
Assignee: Koninklijke Philips NV
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Filing: 1992-10-23
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Granted: —
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Expires: 2012-10-23
Abstract
Abstract In order to obtain the benefits of benefits of field and frame recursive noise reduction while reducing the detriments thereof, a circuit arrangement includes a motion compensated frame recursive noise reduction circuit (12,14,18,24,32,34) and a motion compensated field recursive noise reduction circuit (36,38,42,52,32). The outputs of these two noise reduction circuits are then combined (18). The motion compensation signals for the field and frame recursive noise reduction circuits are determined such that in the case of little or no detected motion, the system is biased toward frame recursive noise reduction to achieve the best resolution on still and slow moving scenes. While in the case of increased motion, the circuit reverts more to field recursive noise reduction to reduce smearing.
Inventors
- 👤 Red Alan Darby
- 👤 Johannes Franciscus Aloysius Koppelmans
- 👤 Johannes Marius Menting
- 👤 Gerard De Haan
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 18:33
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/21; H04N7/00; H04N7/015; H04N7/0152; H04N7/0155
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
69 words
An arrangement for reducing noise in television signals, comprising: means for obtaining motion information signals from said television signals; means for delaying said television signals by a field period and by a frame period, thereby creating field delayed television signals and frame delayed television signals; means for combining said television signals, said field delayed television signals and said frame delayed television signals in dependence upon said motion information signals.
Claim 2
Dependent Claim
16 words
An arrangement as claimed in claim 1, wherein said television signals comprise said motion information signals.
Claim 3
Dependent Claim
29 words
An arrangement as claimed in claim 2, wherein said television signals are HD-MAC television signals and said motion information signals are DATV signals encoded in said HD-MAC television signals.
Claim 4
Dependent Claim
71 words
A normal definition television receiver including a television signal artifacts reducing arrangement, comprising: means for receiving high definition television signals having motion information signals; means for extracting said motion information signals from said high definition television signals; means for delaying said high definition television signals, thereby producing delayed television signals; and means for combining said high definition television signals and said delayed television signals in dependence upon said motion information signals.
Claim 5
Dependent Claim
32 words
An arrangement as claimed in claim 4, wherein said delaying means include a frame delay and said combining means comprise a transversal filter for furnishing a television signal with reduced encoding artifacts.
Claim 6
Dependent Claim
32 words
An arrangement as claimed in claim 4, wherein said delaying means include a frame delay and said combining means comprise a recursive filter for furnishing a television signal with reduced noise artifacts.
Claim 7
Dependent Claim
330 words
An arrangement for combining field and frame recursive noise reduction for input video signals, said input video signals forming, on display, picture frames including two successive fields of scanning lines, said apparatus comprising: an input for receiving said input video signals; field delay means coupled to said input for delaying said input video signals by the duration of a single field forming field delayed video signals; frame delay means coupled to said input for delaying said input video signals by the duration of a single frame forming frame delayed video signals; means coupled to said frame delay means for performing a frame recursive noise reduction on said input video signals, comprising first means for subtracting said input video signals from said frame delayed video signals forming a first difference signal, means coupled to said first subtracting means for providing a portion of said first difference signal in dependence on a first motion signal applied to a control input thereof, and combining means for adding said portion of said first difference signal to aid input video signals thereby forming frame recursive noise reduced video signals; means for determining the first motion signal from said first difference signal at an output of said first subtracting means; means coupled to said field delay means for performing a field recursive noise reduction on said input video signals, comprising second means for subtracting said input video signals from said field delayed video signals forming a second difference signal, means coupled to said second subtracting means for providing a portion of said second difference signal in dependence on a second motion signal applied to a control input thereof, and means for adding said portion of said second difference signal to said frame recursive noise reduced video signals; means for determining an intermediate motion signal from said second difference signal at an output of said second subtracting means; and means for determining the second motion signal by combining said intermediate motion signal with said first motion signal.
Claim 8
Dependent Claim
62 words
An apparatus as claimed in claim 7, wherein said means for determining said first motion signal comprises: means for filtering said first difference signal and for determining an absolute value thereof; and means for storing a noise reduction curve, having an input for receiving said absolute value of said filtered first difference signal and an output for providing said first motion signal.
Claim 9
Dependent Claim
62 words
An apparatus as claimed in claim 7, wherein said means for determining said intermediate motion signal comprises: means for filtering said second difference signal and for determining an absolute value thereof; and means for storing a noise reduction curve, having a input for receiving said absolute value of said filtered second difference signal and a output for providing said intermediate motion signal.
Claim 10
Dependent Claim
80 words
An apparatus as claimed in claim 7, wherein said means for determining said second motion signal comprises: means for subtracting said first motion signal from said intermediate motion signal thereby forming a resultant difference signal; and means for setting said second motion signal equal to said resultant difference signal if said resultant difference signal is greater than zero, and for setting said second motion signal equal to zero if said resultant difference signal is less than or equal to zero.
References Cited (Backward Citations)
US4954894A
Cited
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