Method and apparatus for scene change detection in digital video compression
US5844607A · kind A · utility
17Cited by
12References
3Claims
0Family size
Assignee
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Key dates
| Filing date | Apr 3, 1996 |
| Grant date | Dec 1, 1998 |
| Priority date | — |
| Expiry date | Apr 3, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/15
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of encoding a picture in an MPEG2 compliant digital video encoder. The method calculates a contrast function, EQU Contrast=.SIGMA..vertline.P(j)-P(j+1).vertline. and thereafter calculates a quantization adjustment function therefrom EQU M(i+1)=C(i+1)/C(i)!M(i), where C=Contrast, P(j) is the luminance or chrominance of the j.sup.th pixel, and M(i)is the average quantization of the i.sup.th picture. The quantization or picture type is adjusted in response to the contrast function, C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.