Upsampling filter and half-pixel generator for an HDTV downconversion system
US6184935A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 1999 |
| Grant date | Feb 6, 2001 |
| Priority date | — |
| Expiry date | Mar 29, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video down conversion system compliant with the Advanced Television Systems Standard (ATSC) includes a decoder which decodes a Main Profile, High Level (MP@HL) image and employs a downconversion processor to produce a standard definition video signal. The system stores a subsampled image in order to reduce memory requirements and employs an upsampling filter to generate reference image data from the stored. subsampled image. The reference image data spatially correspond to the image data produced by the video decoder before it is subsampled. The upsampling filter uses different filter coefficients based on the subsampling phase of the stored image and the half-pixel indicator in the motion vector which is used to locate the downsampled reference image data in the stored subsampled image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.