Information-processing device and information-processing system
US7502053B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 21, 2006 |
| Grant date | Mar 10, 2009 |
| Priority date | — |
| Expiry date | Oct 15, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T1/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
For an information terminal to be operated by users for collecting predetermined pieces of information from remote information devices by free-space optical communication, the present invention provides a technique for suppressing the power consumption of the information terminal by minimizing the amount of calculation performed to collect the aforementioned information. According to the present invention, each information device emits ID light on which a low-frequency pilot signal is superimposed. The information terminal captures a series of frames of images including the ID light and locates the ID light within the images by the following steps: (1) creating multiple levels of binned images having different resolutions for each frame of the image; (2) calculating an evaluation index for each pixel within a target range of the binned images at each level, from the lowest to the highest resolution, where the target range is narrowed every time the process switches over to a lower level. In (2), the evaluation index is calculated by an evaluation function including fast Fourier transformation performed throughout the series of frames of images. The evaluation index thus calculated …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.