Accurate detection of a drastic change between successive pictures
First Claim
1. 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.
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Accused Products
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.
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Citations
12 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. 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:
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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. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification