# US 2014/0193162 A1 · Information transmission system, information sending device, information receiving device, information transmission method, information sending method, information receiving method and program product > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0193162 A1 - Document ID: US20140193162A1 - Status: Published application - Kind: A1 - Application number: 14/210,347 - Filed: 2014-03-13 - Published: 2014-07-10 - Earliest claimed: 2011-06-23 - Assignees: Casio Computer Co., Ltd. - Applicants: Casio Computer Co., Ltd. - Inventors: Nobuo IIZUKA; Keiichi KANEKO; Masaaki KIKUCHI - Web page: https://patentgrep.com/patent/US20140193162A1 ## CPC - H04B 10/516: Details of coding or modulation - H04B 10/11: Arrangements specific to free-space transmission, i.e. transmission through air or vacuum - H04B 10/1129: {Arrangements for outdoor wireless networking of information} - H04B 10/116: Visible light communication - H04B 10/548: Phase or frequency modulation - H04B 10/69: Electrical arrangements in the receiver - H04B: TRANSMISSION ## 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. ## Claims ### Claim 1 An information transmission system comprising: an information sending device including a light emitting section which emits light in a plurality of colors, a modulating section which modulates information to be transmitted into signals composed of changes in color, and a light emission control section which controls the light emitting section to emit light while changing color temporally based on the signals generated by the modulating section; and an information receiving device including an imaging section which captures an image having color, a converting section which converts color change of images consecutively captured by the imaging section to information on color space including at least saturation and brightness as parameters, a generating section which generates an image expressed by the parameters of saturation and brightness on color space generated by the converting section from the images consecutively captured by the imaging section, a detecting section which detects the temporal color change by identifying an image of the light emitting section whose light emission control has been performed by the information sending device, based on the image generated by the generating section, a decoding section which decodes the color change detected by the detecting section into information, and an information output section which outputs the information generated by the decoding section. ### Claim 2 (depends on 1) The information transmission system according to claim 1, wherein: the information on color space generated by the converting section includes a hue parameter; and the decoding section decodes the color change into the information by judging the color change detected by the detecting section as change in hue parameter in the color space, and converting the color change to corresponding signal sequence. ### Claim 3 (depends on 1) The information transmission system according to claim 1, wherein: the information sending device and the information receiving device each further include a table in which signals included in information to be transmitted and received are associated with information on color changes in a plurality of stages; the modulating section modulates the information to be transmitted into the signals composed of changes in color by referencing the table; and the decoding section decodes the color change detected by the detecting section into the information by referencing the table. ### Claim 4 (depends on 3) The information transmission system according to claim 3, wherein the table defines types of acceptable color changes based on a redundancy level. ### Claim 5 (depends on 1) The information transmission system according to claim 1, wherein the information sending device includes a display device which displays a predetermined image by emitting light in a plurality of colors in pixel units. ### Claim 6 (depends on 5) The information transmission system according to claim 5, wherein the light emission control section controls light emission while changing color temporally using a pixel area of the display device as the light emitting section. ### Claim 7 The information transmission system according to claim. 6, wherein the pixel area of the display device whose light emission control has been performed by the light emission control section has a frame display area set around a periphery thereof which is used to differentiate from an image displayed outside of the pixel area. ### Claim 8 An information receiving device comprising: an imaging section which captures an image having color; a converting section which converts color change of images consecutively captured by the imaging section to information on color space including at least saturation and brightness as parameters; a generating section which generates an image expressed by the parameters of saturation and brightness on color space generated by the converting section from the images consecutively captured by the imaging section; a detecting section which detects a pixel area whose color changes temporally by identifying the pixel area whose color changes, based on the image generated by the generating section; a decoding section which decodes the color change detected by the detecting section into information; and an information output section which outputs the information generated by the decoding section. ### Claim 9 (depends on 8) The information receiving device according to claim 8, wherein: the information on color space generated by the converting section includes a hue parameter; and the decoding section decodes the color change into the information by judging the color change detected by the detecting section as change in hue parameter in the color space, and converting the color change to corresponding signal sequence. ### Claim 10 (depends on 8) The information receiving device according to claim 8, further comprising: a table in which signals included in information to be decoded are associated with information on color changes in a plurality of stages; wherein the decoding section decodes the color change detected by the detecting section into the information by referencing the table. ### Claim 11 An information transmission method comprising: modulating information to be transmitted into signals composed of changes in color; performing light emission control by controlling a light emitting section which emits light in a plurality of colors so that the light emitting section emits light while changing color temporally based on the signals generated in the modulating; converting color change of images consecutively captured by an imaging section which captures an image having color to information on color space including at least saturation and brightness as parameters; generating an image expressed by the parameters of saturation and brightness on color space generated by the converting from the images consecutively captured by the imaging section; detecting a temporal color change of the light emitting section emitting light by performing the light emission control, based on the image generated by the generating; decoding the color change detected in the detecting into information; and outputting the information generated in the decoding. ### Claim 12 An information receiving method comprising: converting color change of images consecutively captured by an imaging section which captures an image having color to information on color space including at least saturation and brightness as parameters; generating an image expressed by the parameters of saturation and brightness on color space generated in the converting from the images consecutively captured by the imaging section; detecting a pixel area whose color changes temporally by identifying the pixel area whose color changes, based on the image generated in the generating; decoding color change detected in the detecting into information; and outputting the information generated in the decoding. ### Claim 13 A non-transitory computer-readable storage medium having a program stored thereon that is executable by a computer in an image display device having an imaging section which captures an image having color, the program being executable by the computer to control the computer to perform functions comprising: conversion processing for converting color change of images consecutively captured by the imaging section to information on color space including at least saturation and brightness as parameters; generation processing for generating an image expressed by the parameters of saturation and brightness on color space generated by the conversion processing from the images consecutively captured by the imaging section; detection processing for detecting a pixel area whose color changes temporally by identifying the pixel area whose color changes, based on the image generated by the generation processing; decode processing for decoding color change detected by the detection processing into information; and information output processing for outputting the information generated by the decode processing. ### Claim 14 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. ### Claim 15 (depends on 14) The information sending device according to claim 14, 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. ### Claim 16 (depends on 15) The information sending device according to claim 15, wherein the light receiving device includes an image sensor. ### Claim 17 (depends on 14) The information sending device according to claim 14, 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. ### Claim 18 (depends on 17) The information sending device according to claim 17, 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. ### Claim 19 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. ### Claim 20 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.