Data compression system having perceptually weighted motion vectors
US5301019A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 17, 1992 |
| Grant date | Apr 5, 1994 |
| Priority date | — |
| Expiry date | Sep 17, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/124
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A data compression system responsive to a preprocessed digitally encoded high definition video signal includes a discrete cosine transform, a frequency weighting filter, and an inverse discrete cosine transform circuit to provide a digitally encoded video signal within which the high frequency terms of the discrete cosine transform have been reduced. A motion compensated predictive coding data compression system organizes the current frame and a previous frame into a plurality of pixel blocks. The pixel blocks are compared by an error calculating and matching circuit under the influence of a timing control to provide an error value output. A spatial weighting factor is applied to each error value output to provide spatially weighted error values which are used to produce a corresponding plurality of motion vectors. The motion vector corresponding to the lowest weighted error value is selected by a motion vector selector for application to a channel buffer/encoder and eventual transmission.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.