Patent ID: 7942340

Claim:
A two-dimensional code comprising: an exterior region distinguishable from a background based on brightness or color, the exterior region having a square contour; and an interior region disposed such that a distance provided between a top side or a bottom side of the exterior region and the interior region is equal to a distance provided between a right side or a left side of the exterior region and the interior region, wherein the interior region is divided into cells of a predetermined size so that information is represented by brightness or color of each of the cells, wherein the cells, each having the shape of a hexagon, are disposed so as to abut each other, wherein the hexagon has equal height and width, wherein two vertices of the hexagon are positioned at midpoints of a right side and a left side of a quadrangle whose length of each side is equal to the height and the width of the hexagon, the quadrangle being circumscribed to the hexagon, and wherein four other vertices of the hexagon are positioned upside and downside of the quadrangle.