Code pattern for providing information and decoding method and image processing device

摘要

A code pattern for providing information is disclosed, which can effectively improve the ratio of effective marks, and the effective marks are distributed in a rhombus area. The code pattern comprises: a plurality of nominal positions and a plurality of information marks. The nominal positions are respectively located at a plurality of intersections of a plurality of first hypothetical lines and a plurality of second hypothetical lines, and the first hypothetical lines are parallel to one diagonal line within the rhombus area. The plurality of information marks are respectively disposed within the area formed by the nominal positions, and each information mark is used to represent one of at least two values.

主权项

1. A data reading method for code pattern, comprising the following steps:
searching for a plurality of boundary marks from a code pattern; defining a rhombus area according to the boundary marks, wherein the rhombus area comprises a plurality of information marks and at least one orientation mark; defining a plurality of nominal positions within the rhombus area according to the boundary marks, wherein the nominal positions are at intersections of a plurality of first hypothetical lines and a plurality of second hypothetical lines, and wherein the first hypothetical lines and the second hypothetical lines are respectively parallel to two diagonal lines of the rhombus area and non-parallel to sides of the rhombus area; searching for the at least one orientation mark to determine an orientation of the code pattern; and defining one of at least two values represented by the information marks according to the other nominal positions and the positions of the information marks, so as to obtain the information represented by the code pattern;
wherein the boundary marks are disposed at two adjacent sides of the rhombus area;wherein when a number of the boundary marks is five and a number of the at least one orientation mark is one, the code pattern is able to accommodate twelve information dots and has a ratio of effective marks about 66.7%; andwherein the ratio of effective marks is equal to a number of the information marks divided by a sum of the numbers of the boundary marks, the at least one orientation mark and the information marks.