US5032905A
Expired / Lapsed
US
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Accurate detection of a drastic change between successive pictures
Assignee: NEC Corp
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Filing: 1990-05-11
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Granted: 1991-07-16
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Expires: 2010-05-11
Abstract
Abstract On detecting a drastic change, such as a scene change, between current and previous ones of successive pictures which are represented by a digital video signal and each of which comprises a predetermined number of picture elements, the digital video signal is processed by using correlations between the picture elements within each of the successive pictures to produce a processed signal which represents processed results for each of the successive pictures. A statistical distribution of the processed results is calculated from the processed signal. The statistical distribution of the processed results in the current picture is collated with the statistical distribution of the processed results in the previous picture to be produced as a change detection signal representative of the drastic change with reference to a relationship between the statistical distribution of the processed results in the current picture and the statistical distribution of the processed results in the previous picture. The processed signal may be obtained by producing a difference signal between the digital video signal and a prediction signal predictive of the digital video signal by using the correlations. Alternatively, an orthogonal transform is carried out for the digital video signal to produce the processed signal.
Inventors
- 👤 Toshio Koga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:45
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/147; G; G06; G06T; G06T7/00; G06T7/20; G06T7/277; H04N19/00; H04N19/10; H04N19/134; H04N19/142; H04N19/169; H04N19/179; H04N19/85; H04N19/87; H04N5/144
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
158 words
A method of detecting a scene change between current and previous pictures which are two adjacent ones of successive pictures represented by an input digital video signal, each of said successive pictures comprising a predetermined number of picture elements, said method comprising the steps of: processing said input digital video signal by using correlations between the picture elements within each of said successive pictures to produce a processed signal which represents processed results for each of said successive pictures; calculating a statistical distribution of said processed results in response to said processed signal; and collating the statistical distribution of said processed results in said current picture with the statistical distribution of said processed results in said previous picture to produce a change detection signal representative of said scene change with reference to a relationship between the statistical distribution of said processed results in said current picture and the statistical distribution of said processed results in said previous picture.
Claim 2
Independent Claim
158 words
A method of detecting a scene change between current and previous pictures which are two adjacent ones of successive pictures represented by an input digital video signal, each of said successive pictures comprising a predetermined number of picture elements, said method comprising the steps of: processing said input digital video signal by using correlations between the picture elements within each of said successive pictures to produce a processed signal which represents processed results for each of said successive pictures; calculating a statistical distribution of said processed results in response to said processed signal; and collating the statistical distribution of said processed results in said current picture with the statistical distribution of said processed results in said previous picture to produce a change detection signal representative of said scene change with reference to a relationship between the statistical distribution of said processed results in said current picture and the statistical distribution of said processed results in said previous picture.
Claim 3
Dependent Claim
80 words
A method as claimed in claim 1, wherein said processing step comprises the steps of: predictively producing, in response to said input digital video signal, a prediction signal predictive of said input digital video signal by using correlations between the picture elements within each of said successive pictures; and producing, as said processed signal, a difference signal which represents, as said processed results, differences between said input digital video signal and said prediction signal for each of said successive pictures.
Claim 4
Dependent Claim
51 words
A method as claimed in claim 1, wherein said processing step is for carrying out an orthogonal transform of said input digital video signal to produce, as said processed signal, a result signal which represents, as said processed results, transform results of said orthogonal transform for each of said successive pictures.
Claim 5
Dependent Claim
76 words
A method as claimed in claim 1, wherein said collating step comprises the steps of: calculating distribution differences between the statistical distribution of said processed results in said current picture and the statistical distribution of said processed results in said previous picture; and comparing each of said distribution differences with a predetermined threshold value to produce said change detection signal with reference to a relationship between each of said distribution differences and said predetermined threshold value.
Claim 6
Dependent Claim
77 words
A method as claimed in claim 4, wherein said distribution difference calculating step comprises the steps of: temporarily memorizing the statistical distribution of said processed results in said current picture during one frame of said input digital video signal to produce a delayed distribution having a delay which is equal to said one frame; and producing differences between the statistical distribution of said processed results in said current picture and said delayed distribution as said distribution differences.
Claim 7
Dependent Claim
54 words
A method as claimed in claim 4, wherein: said distribution difference calculating step is for calculating a sum of absolute values of said distribution differences; said comparing step being for comparing said sum with said predetermined threshold value to produce said change detection signal when said sum is greater than said predetermined threshold value.
Claim 8
Dependent Claim
179 words
A detecting device for detecting a scene change between current and previous pictures which are two adjacent ones of successive pictures represented by an input digital video signal, each of said successive pictures comprising a predetermined number of picture elements, said device comprising: processing means for processing said input digital video signal by using correlations between the picture elements within each of said successive pictures to produce a processed signal which represents processed results for each of said successive pictures; statistical distribution calculating means connected to said processing means and supplied with said processed signal for calculating a statistical distribution of said processed results; and collating means connected to said statistical distribution calculating means for collating the statistical distribution of said processed results in said current picture with the statistical distribution of said processed results in said previous picture to produce a change detection signal representative of said scene change with reference to a relationship between the statistical distribution of said processed results in said current picture and the statistical distribution of said processed results in said previous picture.
Claim 9
Dependent Claim
179 words
A detecting device for detecting a scene change between current and previous pictures which are two adjacent ones of successive pictures represented by an input digital video signal, each of said successive pictures comprising a predetermined number of picture elements, said device comprising: processing means for processing said input digital video signal by using correlations between the picture elements within each of said successive pictures to produce a processed signal which represents processed results for each of said successive pictures; statistical distribution calculating means connected to said processing means and supplied with said processed signal for calculating a statistical distribution of said processed results; and collating means connected to said statistical distribution calculating means for collating the statistical distribution of said processed results in said current picture with the statistical distribution of said processed results in said previous picture to produce a change detection signal representative of said scene change with reference to a relationship between the statistical distribution of said processed results in said current picture and the statistical distribution of said processed results in said previous picture.
Claim 10
Dependent Claim
94 words
A detecting device as claimed in claim 7, wherein said processing means comprises: prediction signal producing means responsive to said input digital video signal for predictively producing a prediction signal predictive of said input digital video signal by using correlations between the picture elements within each of said successive pictures; and difference signal producing means connected to said prediction signal producing means for producing, as said processed signal, a difference signal which represents, as said processed results, differences between said input digital video signal and said prediction signal for each of said successive pictures.
Claim 11
Dependent Claim
52 words
A detecting device as claimed in claim 7, wherein said processing means is for carrying out an orthogonal transform of said input digital video signal to produce, as said processed signal, a result signal which represents, as said processed results, transform results of said orthogonal transform for each of said successive pictures.
Claim 12
Dependent Claim
96 words
A detecting device as claimed in claim 7, wherein said collating means comprises: distribution difference calculating means connected to said statistical distribution calculating means for calculating distribution differences between the statistical distribution of said processed results in said current picture and the statistical distribution of said processed results in said previous picture; and comparing means connected to said distribution difference calculating means for comparing each of said distribution differences with a predetermined threshold value to produce said change detection signal with reference to a relationship between each of said distribution differences and said predetermined threshold value.
Claim 13
Dependent Claim
101 words
A detecting device as claimed in claim 10, wherein said distribution difference calculating means comprises: temporary memorizing means connected to said statistical distribution calculating means for temporarily memorizing the statistical distribution of said processed results in said current picture during one frame of said input digital video signal to produce a delayed distribution having a delay which is equal to said one frame; and means connected to said statistical distribution calculating means and to said temporary memorizing means for producing differences between the statistical distribution of said processed results in said current picture and said delayed distribution as said distribution differences.
Claim 14
Dependent Claim
55 words
A detecting device as claimed in claim 10, wherein: said distribution difference calculating means is for calculating a sum of absolute values of said distribution differences; said comparing means being for comparing said sum with said predetermined threshold value to produce said change detection signal when said sum is greater than said predetermined threshold value.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-15 | 1995-01-14 | 1995-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-15 | 1999-01-14 | 1999-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-15 | 2003-01-14 | 2003-07-16 | $7700.00 | Window Closed / Lapsed |