Method and apparatus for compressing and decompressing a digital video signal using predicted and error images
US5134478A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 23, 1991 |
| Grant date | Jul 28, 1992 |
| Priority date | — |
| Expiry date | May 23, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/85
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a method of encoding a sequence of frames of a full color digital motion video signal, the initial frame of the sequence is selected for encoding at multiple levels of resolution. The initial frame becomes a previous target image and a previous reconstructed image is formed by storing a reconstructed image. After processing the initial frame, each subsequent frame of the sequence of frames is then selected as the target image. Displacement vectors, representing the magnitude and displacement between regions in the target image being processed and corresponding regions in the previous target image are provided. Each displacement vector is applied to a corresponding region in the previous reconstructed image to form a predicted image. The displacement vectors are encoded using a binary tree technique with off-center splits. An error image, which is formed by subtracting pixel values in the predicted image from corresponding pixel values in the target image is encoded at multiple levels of resolution using a binary tree technique with off-center splits. A new previous target image is formed by storing the target image being processed in place of the previous target image. A new pre…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.