Visible light receiving method and apparatus using the same

摘要

A visible light is photographed through an optical diffusion filter with a camera of a portable terminal. The camera includes a pixel amplifier sequential output type imaging element in which electric charges generated in respective pixels are amplified by respective pixel amplifiers, to output imaging signals in sequence from the respective pixel amplifiers. A striped pattern based on an information signal is generated in the column direction or row direction in the imaging element, in a photographed optically-diffused image. The information signal is extracted to be demodulated on the basis of a state of generation of the striped pattern.

主权项

1. A visible light receiving method comprising:
a step of photographing a visible light that an information signal is superimposed on the visible light, and which is irradiated for visible light communication, as an image not to be formed, by the imaging element with a camera having a pixel amplifier sequential output type imaging element; and with the imaging element of the camera, a step of amplifying electric charges generated in respective pixels by respective pixel amplifiers, to output imaging signals in sequence from the respective pixel amplifiers; a step of carrying out image processing of image data acquired from the imaging signals by frame; and a step of extracting and demodulating information signals of a plurality of samples in one frame, wherein the imaging element accumulates electric charges in the pixels in the row or the pixels in the column at a timing for each row or each column of pixels, to output signals based on the electric charges accumulated in the respective pixels in sequence at timings for respective pixels from the pixel amplifiers of the respective pixels, and generates a striped pattern based on an information signal in the row direction or the column direction of the pixels in the photographed optically-diffused image, thereby extracting and demodulating the information signal on the basis of a state of generation of the striped pattern.