Decoding method of two-dimensional point code

Abstract

The invention provides a decoding method of a two-dimensional point code, which comprises the following steps: defining the coordinates of the locating points of the two-dimensional point code; performing extrapolation and interpolation operations according to the coordinates of the locating points, so as to establish the coordinates of a plurality of virtual data points; and finally, comparing the data point with the virtual data points, so as to learn the reappearing information of the two-dimensional point code. When an image of the two-dimensional point code is inclined, all points in the image can still keep a geometrical relationship of interpolation and extrapolation; therefore, the decoding method is still applicable when the acquired image is inclined.

Description

technical field [0001] The present invention relates to a graphical digital code, in particular to a decoding method of a two dimensional bar code. Background technique [0002] Two-dimensional dot code is a pattern drawn according to specific rules to reproduce a specific information. It is often used in teaching materials, such as children's American English teaching materials. These teaching materials are printed with clear and obvious main characters, and compared with the main characters, the very small and unobvious two-dimensional dot codes are printed behind the main characters as the background of the main characters. When users read the main characters, At the same time, use the optical reading device to scan and input the two-dimensional point code in the background to a computer or other device, and the device will decode the two-dimensional point code and output its corresponding information to strengthen the user's understanding of the main characters. impress...

AI Technical Summary

Problems solved by technology

[0004] Although the encoding methods of each company are different, because the image input by the user's scan is often skewed, it is necessary to judge the angle difference between the 2D dot code image and the preset direction according to the positioning point and direction point when decoding. , after the two-dimensional point code is rotated and corrected, the information represented by the data point can be judged according to the position of the data point to perform the corresponding action. However, the calculation of the rotation needs to use sine and cosine operations, and the farther away from the rotation center point, the error The bigger it is, the calculation is complicated and it is easy to misjudge

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