The invention relates to an optimal communication method and
system, in particular to a method and
system for obtaining information by the way of camera shooting, a camera shooting device and an information modulation device. The method and
system for obtaining information by the way of camera shooting, the camera shooting device and the information modulation device are characterized in that the system comprises a pick-up object and the camera shooting device, and the pick-up object gives out modulation light including additional information; the camera shooting device comprises a camera, a modulation pixel
demodulation unit and a display unit; the camera obtains an image of the pick-up object, image pixels of the image of the pick-up object acquire the additional information included in the modulation light through the modulation pixel
demodulation unit, and the additional information is displayed on a screen of the display unit. The method and system for obtaining information by the way of camera shooting, the camera shooting device and the information modulation device have the advantages that a modulator is used for modulating a
light source so that the additional information can be loaded, and the camera shooting device is used for demodulating and recovering the additional information, can acquire the information of the pick-up object and can also be used for transmitting advertising information; by the way of local modulating of image signals, the camera shooting device can acquire local information of the image such as brands and linkage of personal clothes.