Methods for constructing, generating, and reading dot-matrix code, dot-matrix code generating and reading terminals, and dot-matrix code system

A method for constructing a dot-matrix code, comprising:

• constructing a plurality of information units arranged in an N×N matrix;
• configuring the plurality of information units as information unit modules and/or marker unit modules, respectively;
• wherein each information unit is either one of the information unit modules or one of the marker unit modules, and the dot-matrix code consists of the information unit modules and the marker unit modules, wherein each information unit contains one and only one information point;
• storing, in each of the information unit modules, a value based on a relative position of the information point within the corresponding information unit module;
• and
• signaling identification information of the dot-matrix code through an arrangement of a subset of the information points, wherein the subset of the information points are contained in the marker unit modules;
• wherein, of the information points that are located in the marker unit modules, those representing the top boundary, the bottom boundary, the left boundary, or the right boundary of the dot-matrix code are located in centers of the marker unit modules, and a central marker unit module located in the center of the entire dot-matrix code contains an information point located in the upper left portion of the central marker unit module.

A method for constructing a dot-matrix code, comprising:

• constructing a plurality of information units arranged in an N×N matrix;
• configuring the plurality of information units as information unit modules and/or marker unit modules, respectively;
• wherein each information unit is either one of the information unit modules or one of the marker unit modules, and the dot-matrix code consists of the information unit modules and the marker unit modules, wherein each information unit contains one and only one information point;
• storing, in each of the information unit modules, a value based on a relative position of the information point within the corresponding information unit module;
• and
• signaling identification information of the dot-matrix code through an arrangement of a subset of the information points, wherein the subset of the information points are contained in the marker unit modules;
• wherein, of the information points that are located in the marker unit modules, those representing boundaries, not including vertices, of the dot-matrix code are located in centers of the marker unit modules, and those representing four vertices of the dot-matrix code are located in upper left portions of the marker unit modules.