Information transmission system, information sending device, information receiving device, information transmission method, information sending method, information receiving method and program product

Patent metadata

Field	Value
Publication number	US-9716554-B2
Application number	US-201414508888-A
Country	US
Kind code	B2
Filing date	Oct 7, 2014
Priority date	Jun 23, 2011
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

An information transmission system includes: an information sending device including a light emitting section that emits light in a plurality of colors, a modulating section that modulates information to be transmitted into signals composed of changes in color, and a light emission control section that controls the light emitting section to emit light while changing color temporally based on the signals generated by the modulating section; and a receiving device including a camera that captures an image having color, and a control and communication section that detects a temporal color change of the light emitting section emitting light by light emission control by the information transmitting device, from images consecutively captured by the camera, decodes the detected color change into information, and outputs the generated information to a display section.

First claim

What is claimed is:

1. An information sending device comprising:
a table in which signals included in information to be transmitted are associated with information on color changes in a plurality of stages based on redundancy;
a modulating section which modulates the information to be transmitted into signals composed of changes in color by referencing the table; and
a light emission control section which controls a light emitting section which emits light in a plurality of colors to emit light while changing color temporally based on the signals generated by the modulating section,
wherein the light emission control section further controls the light emitting section by setting a temporal color change period comprising a light emission period in which the light emission control section controls the light emitting section to emit light while changing color of the emitted light temporally and a non-light emission period in which the light emission control section controls the light emitting section to not emit light, and during which the color of the temporal color change period is black.

2. The information sending device according to claim 1 , wherein a configuration of the color changes is determined based on color separation characteristics or color shade adjustment characteristics of a light receiving device for receiving the color changes during light reception.

3. The information sending device according to claim 2 , wherein the light receiving device includes an image sensor.

4. The information sending device according to claim 1 , wherein the light emitting section is a pixel area of an image display section which emits light in a plurality of colors in pixel units.

5. The information sending device according to claim 4 , wherein the pixel area has a frame display area set around a periphery thereof which is used to differentiate from an image displayed outside of the pixel area.

6. An information sending method comprising:
modulating information to be transmitted into signals composed of changes in color by referencing a table in which signals included in the information to be transmitted are associated with information on color changes in a plurality of stages based on redundancy; and
controlling a light emitting section which emits light in a plurality of colors to emit light while changing color temporally based on the signals generated in the modulating,
wherein the light emitting section is further controlled by setting a temporal color change period comprising a light emission period in which the light emission control section controls the light emitting section to emit light while changing color of the emitted light temporally and a non-light emission period in which the light emission control section controls the light emitting section to not emit light, and during which the color of the temporal color change period is black.

7. A non-transitory computer-readable storage medium having a program stored thereon that is executable by a computer to control the computer to perform functions comprising:
modulation processing for modulating information to be transmitted into signals composed of changes in color by referencing a table in which signals included in the information to be transmitted are associated with information on color changes in a plurality of stages based on redundancy; and
light emission control processing for controlling a light emitting section which emits light in a plurality of colors to emit light while changing color temporally based on the signals generated by the modulation processing,
wherein the light emission control processing further controls the light emitting section by setting a temporal color change period comprising a light emission period in which the light emission control section controls the light emitting section to emit light while changing color of the emitted light temporally and a non-light emission period in which the light emission control section controls the light emitting section to not emit light, and during which the color of the temporal color change period is black.

Assignees

• Casio Computer Co Ltd

Inventors

• Iizuka Nobuo
• Kaneko Keiichi
• Kikuchi Masaaki

Classifications

• H04B10/69

  Electrical arrangements in the receiver · CPC title

• H04B10/116

  Visible light communication · CPC title

• H04B10/1129 Primary

  Arrangements for outdoor wireless networking of information · CPC title

• H04B10/516 Primary

  Details of coding or modulation · CPC title

• H04B10/11

  Arrangements specific to free-space transmission, i.e. transmission through air or vacuum · CPC title