2-dimensional code existing region detection method, two-dimensional code reading method, and recording medium

摘要

PROBLEM TO BE SOLVED: To shorten time needed for existence area detection processing itself by providing test lines obtained by setting start points at one edge of an image area and test lines obtained by setting end points at the other edge and making the end points of the respective test lines short by a prescribed length from the image area edge opposite to their start points. ;SOLUTION: Test lines are set so that the test directions of test lines adjacent to each other can be alternately opposite. That is, even though a test line (1) is made to direct from the left to the right, test lines (2) and (3) set on the both sides (upper and lower side) of the line (1) are made to direct from the right to the left. In test lines (4) to (9), test directions are made alternately opposite in the same way. Then, the end points of the respective test lines (1) to (9) are made short from the edge of an image area by a prescribed length W1. The prescribed length W1 is set with the minimum size of a two-dimensional image being a read object which can be taken on an image data memory as reference. Concretely, a length obtained by reducing the minimum size by 1 to 2 cells is defined as the prescribed length W1.;COPYRIGHT: (C)2000,JPO