The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 11, 2010
Filed:
Jul. 27, 2005
Keiichiro Kagawa, Ikoma, JP;
Yuki Maeda, Ikoma, JP;
Jun Ohta, Ikoma, JP;
Japan Science and Technology Agency, Kawaguchi-shi, JP;
National University Corporation Nara Institute of Science and Technology, Ikoma-shi, JP;
Abstract
In a system for data communication between an information terminal to be operated by a user and remote communication nodes, the present invention intends to suppress the power consumption of the information terminal. For that purpose, communication nodesandeach emit diffuse light carrying a pilot signal blinking at a low frequency to notify the presence of the communication node and an ID signal belonging to a higher frequency range, the ID signal containing inherent address etc. for identifying each communication node. A mobile phoneas the information terminal captures an image and processes the image data to detect the pilot signal of each communication node. Then, determining the position of each node and setting a limited range for reading the pixels around that position, the mobile phonereads the detection signals of the pixels within the limited range at high speed and obtains identification information. This information is used to identify each node and eliminate influences of any other light source that apparently resembles the pilot signal.