Patent ID: 8886054

Claim:
An information transmission system comprising: a light emitting device which sends information by lighting up a predetermined area; and a light receiving device which captures images of the predetermined area in a time serial manner, and decodes and outputs the information from the captured images, wherein the predetermined area emits light which is color-modulated and multivalued by a combination of respective time-serial changes of at least three values colors, and color space information of the captured images includes parameters defined by three primary colors, wherein the light receiving device includes: a processing section which performs processing such that the processing brings parameters included in color space information of each pixel of the captured images closer to respective axes of the three primary colors; a converting section which converts the parameters of each pixel processed by the processing section to information defined by parameters including at least either of saturation and brightness; and a judging section which judges by filtering a shape of the predetermined area for the images composed of pixels defined by the parameters converted by the converting section based on predetermined conditions, and wherein the predetermined area having the shape filtered by the judging section is targeted, and the information is decoded based on color-modulated and multivalued information of the targeted area.