Method and apparatus for converting a video input signal of progressive scan form to an interlaced video output signal of doubled field rate and employing progressive scan to progressive scan interpolation for reduction of visual artifacts
US5517247A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 1993 |
| Grant date | May 14, 1996 |
| Priority date | — |
| Expiry date | Oct 5, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/0132
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Video signals of interlaced form are first converted to progressive scan (non-interlaced) form and then picture elements are generated that lie between the "progressive" picture elements and are interpolated by a vertical one-half (1/2) line shuffling by application of a vertical averaging. The interpolated picture elements are buffer stored and are read out again at twice the frame repetition rate whereby each second line of the stored interpolated picture elements is emitted delayed in time by 10 milli-seconds. Fields in the format 100 Hz, 2:1 interlace thereby ensue. Advantageously, interpolated picture elements are used in all of the output fields thereby avoiding picture disturbences at the frame rate (25 Hz) of the original video signal. For increasing the subjective vertical sharpness, a vertical peaking may additionally be carried out.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.