Decoding method of two-dimensional point code

A decoding method and two-dimensional dot code technology, applied in the field of image digital coding, can solve the problems of skew, large error, easy misjudgment, etc.

Inactive Publication Date: 2009-12-30
ELAN MICROELECTRONICS CORPORATION
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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

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  • Decoding method of two-dimensional point code
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  • Decoding method of two-dimensional point code

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Embodiment Construction

[0014] The present invention proposes a method for quickly calculating virtual grid points and virtual data points using interpolation figure 1 and figure 2 The concept of the present invention is explained. When the coordinates of points A1 and A2 are known as (x1, y1) and (x2, y2) respectively, and the distance between point A1 and point A2 is equal to the distance between point A2 and point B1, use extrapolation The coordinates (a, b) of the point B1 are obtained, and then the coordinates of the points C1 and C2 can be obtained by interpolation according to the coordinates of the points A1, A2 and B1. The present invention applies this concept to two-dimensional point codes to quickly simulate and establish the coordinates of virtual grid points and virtual data points. The following is a two-dimensional point code based on five cross-shaped positioning points As an example to illustrate.

[0015] Figure 3 to Figure 5 It is a flow chart of an embodiment of the present...

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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...

Claims

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Application Information

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IPC IPC(8): G06K7/10G06K19/06G06F3/03
Inventor 敖振华陶逸欣
Owner ELAN MICROELECTRONICS CORPORATION
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