Technique of Attaching Information on Real Objects Using Temporally and Spatially Intensity of color modulated Light

- Case of String Pattern as Information -

Abstract

This paper describes a technique that can invisibly attach an information on a surface of real objects by using an illumination light in which temporally and spatially intensity of color modulated, and extract it from video image captured with video camera. We used string pattern as an information in this technique. We first assessed invisibility in terms of colors for a temporally and spatially intensity modulated pattern in the light. We also examined readability of an invisibly attached pattern on the real objects captured with a video camera. The results obtained from these experiments revealed that the invisibility with which the string pattern was embedded in the blue color component was higher rather than for the red and green components. Moreover, we confirmed a range in which invisibility and readability was compatible when the pattern was embedded in the blue color component in the light.