Accurate detection of a drastic change between successive pictur

Details Accurate detection of a drastic change between successive pictur Accurate detection of a drastic change between successive pictur

1990-05-11

1991-07-16

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358136, H04N 718

Patent

active

050329057

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.

REFERENCES:
patent: 4689672 (1987-08-01), Furukawa et al.
patent: 4875094 (1989-10-01), Haghiri et al.
patent: 4890160 (1989-12-01), Thomas

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