Method and apparatus for low frequency removal in vector quantization
US5235418A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1991 |
| Grant date | Aug 10, 1993 |
| Priority date | — |
| Expiry date | Nov 19, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/94
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for low-frequency removal in vector quantization of an image frame. An image frame is converted to plurality of input vectors. A mean value of each input vector is determined and transmitted to a plurality of reception sites. A low-frequency component of each input vector is then determined and removed from the input vector. A scalar mean value of each low-frequency removed vector is then determined and subtracted therefrom to produce a residual vector. The residual vectors are then vector quantized and the vector quantized data is transmitted to the reception sites. At a reception site, the transmitted mean values and vector quantized data are received and each input vector is reproduced therefrom. From the reproduced input vectors, the image frame is recreated for display at the reception site.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.