Code pattern having cross-shaped positioning pattern and image processing device for processing the same

A code matrix, comprising:

• multiple code patterns arranged adjacent to each other, each code pattern comprising:
• a plurality of marks;
• and
• only one cross-shaped positioning pattern composed of five positioning marks, said five positioning marks including a central positioning mark, a first positioning mark, a second positioning mark, a third positioning mark, and a fourth positioning mark, wherein said central positioning mark, said first positioning mark, said second positioning mark, said third positioning mark, and said fourth positioning mark are distributed within a region along with other marks;
• wherein said first positioning mark, said second positioning mark, said third positioning mark, and said fourth positioning mark are four neighboring marks being closest to said central positioning mark in distance;
• wherein said central positioning mark, said first positioning mark, said second positioning mark, said third positioning mark, and said fourth positioning mark a positioning pattern having a shape of a cross;
• wherein a coordinate of said central positioning mark is equal to one-fourth of a sum of coordinates of said first positioning mark, said second positioning mark, said third positioning mark, and said fourth positioning mark;
• and
• wherein the five positioning marks of said positioning pattern form the only group of marks of the plurality of marks having the coordinate of the central positioning mark equal to one-fourth of a sum of coordinates of four respective nearest neighboring marks.

An image processing device, comprising:

• a first device for reading a code matrix composed of multiple code patterns arranged adjacent to each other, each code pattern having a plurality of marks;
• and
• a second device for calculating a correlative relationship between a positional coordinate of each of said marks and positional coordinates of four surrounding marks thereof, so as to find a central positioning mark and four positioning marks, wherein said central positioning mark is located centrally among said four positioning marks;
• wherein said central positioning mark and said four positioning marks form a positioning pattern having a shape of a cross;
• wherein a coordinate of said central positioning mark is equal to one-fourth of a sum of coordinates of said four positioning marks, and
• wherein said central positioning mark and said four positioning marks form the only group of marks of the plurality of marks having the coordinate of the central positioning mark, equal to one-fourth of a sum of coordinates of four respective nearest neighboring marks.

A method for processing a code matrix comprising multiple code patterns arranged adjacent to each other, wherein each code pattern includes a plurality of marks, said method comprising:

• reading said code pattern;
• and
• calculating a correlative relationship between a positional coordinate of each of said marks and positional coordinates of four positioning marks thereof to find a central positioning mark, wherein a coordinate of said central positioning mark is equal to one-fourth of a sum of coordinates of said four positioning marks thereof;
• wherein said central positioning mark and said four positioning marks form a positioning pattern having a shape of a cross within said code pattern;
• and
• wherein said central positioning mark and said four positioning marks form the only group of marks of the plurality of marks having the coordinate of the central positioning mark equal to one-fourth of a sum of coordinates of four respective nearest neighboring marks.