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This paper discusses a visible light communication (VLC) system using a digital signage and an image sensor. We propose a modulation scheme that data information signals are superimposed on a chroma component of the displayed image of the digital signage by taking advantage of the fact that human eyes are difficult to perceive chroma difference than brightness difference. Especially, the proposed scheme utilizes uniform color space to realize hardly perceivable data signal modulation. We show that the proposed scheme has better performance than the conventional scheme with the non-uniform color space.