Efficient down conversion system for 2:1 decimation
US6487249B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 9, 1998 |
| Grant date | Nov 26, 2002 |
| Priority date | — |
| Expiry date | Oct 9, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/59
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An HDTV down conversion system including an apparatus for forming a low resolution 2:1 down converted video signal from an encoded video signal representing a video image. The encoded video signal is a frequency-domain transformed high resolution video signal with motion prediction. The apparatus includes a receiver for receiving encoded video signals as a plurality of high resolution frequency-domain video coefficient values. A down conversion filter receives and weights the high resolution frequency-domain video coefficient values to form a set of low passed frequency-domain video coefficients. An inverse-transform processor transforms the set of frequency-domain video coefficients into a set of pixel values. An averaging filter transforms selected ones of the pixel values in the set of pixel values into averaged pixel values. A decimating processor deletes selected ones of the set of pixel values to provide the low resolution video signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.