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

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.

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.

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.

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.

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.