Surveillance system
US6842540B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 2000 |
| Grant date | Jan 11, 2005 |
| Priority date | — |
| Expiry date | Jul 28, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/60
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A surveillance image is acquired from a surveillance camera. Supplement information (such as date and time, and surveillance camera number) relating to the surveillance image is acquired. By imaging the supplement information, supplement information image data is generated. A quantized discrete cosine transform coefficient block obtained by conducting discrete cosine transform and then quantization on surveillance image data of the surveillance image is added to a quantized discrete cosine transform coefficient block obtained by conducting discrete cosine transform and then quantization on the supplement information image data. A resultant sum is subjected to Huffman encoding. The result is recorded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.