Method and apparatus for predictive coding of moving images while adaptively changing the method in accordance with them
US5418569A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 9, 1993 |
| Grant date | May 23, 1995 |
| Priority date | — |
| Expiry date | Jun 9, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/15
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for predictive coding of moving images consists of the steps of calculating preliminary prediction errors of an original group of frames of moving images, accumulating the preliminary prediction errors to obtain an accumulated value, omitting one or more frames from the original group of frames to produce a decimated group of frames of moving images in cases where the accumulated value is larger than a modified order threshold value Th.sub.2, weighting quantization weighting factors in cases where the accumulated value is larger than a decimated order threshold value TH.sub.3, calculating prediction errors of the decimated group of frames, quantizing the prediction errors with the quantization weighting factors, encoding the prediction errors to produce pieces of output data of which each are composed of a plurality of codes. The amount of the codes of the output data is lower than an upper limit, and the decimated group of frames of moving images is distinctly reproduced by decoding the codes of the output data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.