Method and apparatus for encoding selected images at lower resolution
US5262855A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1992 |
| Grant date | Nov 16, 1993 |
| Priority date | — |
| Expiry date | Mar 25, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/15
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for encoding a sequence of digital motion video images at more than one resolution. In a first embodiment, it is determined whether an image selected from the sequence is part of either a dissolve, a fade, a fast motion region or a complex motion region. If the selected image is part of either a dissolve, a fade, a fast motion region or a complex motion region, then the selected image is encoded at a reduced resolution level. In a further embodiment, a selected image is provided for encoding. A determination is then made whether a parameter derived from an estimate of the available decoding time is above a predetermined threshold. If the parameter is above the predetermined threshold, then the selected image is encoded at a reduced resolution. In a still further embodiment, a selected image from a sub-sequence of images is provided for encoding. A determination is then made whether the quantization step size associated with the image is greater than a predetermined threshold. If the quantization step size is greater than the predetermined threshold, then the image is encoded at a reduced resolution. The image is partially encoded if it is within the first N m…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.