Abstract
This paper proposes a method which lays a color image over a QR code to improve the readability and design ability of QR codes. The proposed method adjusts the luminance of the image according to the QR code to be free from decoding error. This feature of the proposed method allows put the image even on the space which surrounds the QR code for correct decoding. Another way to hide information on the space is introduced based on the above mentioned feature.
