Patent ID: 8511562
Filing Date: 2013-08-20
Classification: G06K,Y10T

Abstract:
1. A layered two-dimensional code comprising a surface layer formed by layering a plurality of code layers each having information cells arranged in a two-dimensional matrix and by integrating said plurality of code layers, wherein each of said plurality of code layers is constructed of said information cells each having a color predetermined for each of said code layers; said surface layer comprises surface-layer information cells obtained by layering said code layers one upon another; and an index information code essentially including information of said predetermined color of each of said code layers is included at one part of said surface layer; when said information cells of said plurality of code layers are present and superposed one upon another at a position thereof corresponding to said surface-layer information cell, a color of said surface-layer information cell is obtained by executing an additive color mixture of colors of said code layers where said superposed information cells are present; when said information cell of only one of said code layers is present at said position thereof corresponding to said surface-layer information cell, said surface-layer information cell has the same color as that of said single code layer; and when said color obtained by executing said additive color mixture is the same as that of any of said plurality of code layers, said color obtained by executing said additive color mixture is converted into a color in accordance with a predetermined conversion algorithm so as to obtain said color of said surface-layer information cells, wherein said predetermined conversion algorithm is an algorithm capable of reversely converting the converted color into said color obtained by executing said additive color mixture includes using said index information code to determine the surface color layers from the predetermined color of each of the code layers.