Method for inserting a visual element into an MPEG bit stream
US6621866B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 28, 2000 |
| Grant date | Sep 16, 2003 |
| Priority date | — |
| Expiry date | Jan 28, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/8358
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A transcoding method for inserting a visual element into an encoded bit stream with minimal decoding of the encoded bit stream. The transcoding method includes the steps of receiving an encoded bit stream containing a picture, partially decoding a copy of the bit stream, determining if a segment of the picture in the bit stream is affected by the insertion of the visual element, re-encoding the segment if the segment is affected by the insertion of the visual element, and outputting the re-encoded bit stream. The encoded and re-encoded bit streams may be MPEG-encoded bit streams. The re-encoded bit stream may be output using a bit rate control process that randomly selects an initial processing point within the re-encoded bit stream, requantizes the re-encoded bit stream using a modified quantization table, and/or utilizes a slice-level stopping criteria for selectively starting or ending bit rate control.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.