Video signal processing
US6757333B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 2000 |
| Grant date | Jun 29, 2004 |
| Priority date | — |
| Expiry date | Jul 18, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/431
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Video signal processing apparatus in which at least two input video signals are combined in proportions determined by a pixel key signal to generate an output video signal for compression, at least one of the input video signals each having respective associated compression parameters from a data compression process applied to that video signal; comprises:means for detecting an average pixel key signal value across each of a plurality of blocks of pixels of the output video signal; andmeans for comparing the average pixel key signal values with first and second thresholds, the first threshold representing a pixel key signal value corresponding to combination having primarily one of the video signals, and the second threshold representing a pixel key signal value corresponding to combination having primarily the other of the video signals;in which:if the average pixel key signal value for a block lies between the first and second thresholds, that block of the output video signal is compressed using newly derived compression parameters; andif the average pixel key signal value for a block lies outside the range defined by the first and second thresholds, the compression parameters as…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.