Sending device, receiving device, communication system, and sending method and receiving method

Abstract

The invention provides a sending device, a receiving device, a sending method and a receiving method. The transmitting device includes: an illumination unit capable of changing the characteristics of emitted light in time series; and a control unit that sets a predetermined period for a symbol included in transmitted information, and uses the value of the symbol within the period to use The lighting part is controlled in such a manner that the characteristic of the light emitted from the lighting part changes in time series. On the other hand, the receiving device has: an imaging unit that generates an image covering an imaging range including at least a part of the range irradiated with light from the transmitting device at a predetermined imaging cycle; Each of the plurality of images extracts a feature amount expressing characteristics of light emitted by an illumination section of the transmitting device; and a decoding section that decodes a value of a symbol based on a change in a time-series order of the feature amount from the symbol set to Each of a plurality of images included in a predetermined period is extracted.

Description

technical field [0001] The present invention relates to, for example, a communication system that transmits signals using light, and a transmitting device, a receiving device, a transmitting method, and a receiving method used in such a communication system. Background technique [0002] In the past, light emitting diodes (Light Emitting Diodes, LEDs) were widely used as illumination sources. Compared with incandescent lamps or fluorescent lamps, LEDs have a characteristic of faster response speed. Taking advantage of this feature, a visible light communication technology is being studied that communicates by superimposing information on illumination light emitted from LEDs by turning LEDs on and off at a speed that cannot be recognized by human eyes (see, for example, Non-Patent Document 1). [0003] Visible light communication is being studied for use in communication applications in places where the use of radio waves is restricted, information distribution limited to ar...

AI Technical Summary

Problems solved by technology

This is because the device on the receiving side cannot directly receive the light emitted by the device on the sending side. For example, when the light emitted by the device on the sending side is reflected by an object or the scattered light is received by the device on the receiving side, The possibility that the color of the light received is different from the original color due to the object

And, because the color of the light received is different from the color of light emitted by the device on the transmitting side, the color of the light received is not a color corresponding to the value of the data contained in the superimposed information, so the receiving It is difficult for the device on the sending side to accurately decode information that is superimposed on the light emitted by the device on the sending side

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