Abstract: A visible light transmitting signal is modulated on the basis of an information signal to be transmitted, and is superimposed on a visible light to be transmitted. A camera (10) photographs the transmitted visible light by use of a pixel amplifier sequential output type imaging element (11), and the pixel amplifier sequential output type imaging element (11) amplifies electric charges generated in respective pixels by respective pixel amplifiers (22), to output imaging signals in sequence from the respective pixel amplifiers (22). Image data of light and dark bands acquired from the imaging signals are taken in by frame, and a differential value is calculated for displacement of exposure amounts of the respective pixels output in sequence or the respective rows. The transmitted information signal is demodulated on the basis of the differential value of the imaging signals of a plurality of samples serving respective pixels or respective rows as one sample in one frame.

Abstract: A visible light transmitting signal is modulated on the basis of an information signal to be transmitted, and is superimposed on a visible light to be transmitted. A camera (10) photographs the transmitted visible light by use of a pixel amplifier sequential output type imaging element (11), and the pixel amplifier sequential output type imaging element (11) amplifies electric charges generated in respective pixels by respective pixel amplifiers (22), to output imaging signals in sequence from the respective pixel amplifiers (22). Image data of light and dark bands acquired from the imaging signals are taken in by frame, and a differential value is calculated for displacement of exposure amounts of the respective pixels output in sequence or the respective rows. The transmitted information signal is demodulated on the basis of the differential value of the imaging signals of a plurality of samples serving respective pixels or respective rows as one sample in one frame.

Abstract: 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.

Abstract: 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.