Accurate detection of a drastic change between successive pictures
Patent 5032905 Issued on July 16, 1991. Estimated Expiration Date: 
May 11, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 11, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMethod and device of coding a digital video signal for reproduction of pictures with a high quality even upon occurrence of a drastical change between the pictures Method of and device for estimating motion in a sequence of pictures TV picture motion vector measurement by correlation of pictures Patent #: 4890160 InventorAssigneeApplicationNo. 522026 filed on 05/11/1990US Classes:348/700Motion dependent key signal generation or scene change detectionExaminersPrimary: Kostak, Victor R.Attorney, Agent or FirmInternational ClassH04N 007/18Foreign Application Priority Data1989-05-11 JPAbstractOn 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. | |
