Robust recognition method for AR code marked on cylinder

An identification method and AR code technology, applied in the field of AR code identification, can solve the problem of low AR code recognition rate and other problems

Active Publication Date: 2017-02-15
SHIJIAZHUANG TIEDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a robust identification method for AR codes marked on

Method used

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  • Robust recognition method for AR code marked on cylinder
  • Robust recognition method for AR code marked on cylinder
  • Robust recognition method for AR code marked on cylinder

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0108] Such as figure 1 As shown, taking a classic AR code with an object to be identified on a certain cylinder and a data bit of 5×5 as an example, the robust identification method of the present invention includes the following steps:

[0109] 1. Improve the coding structure of the AR code by adding positioning flags in the AR code. The specific method is:

[0110] 1-1. Add a row of positioning flags with one data bit on the upper edge of the 5×5 AR code data area, and add a column of positioning flags with one data bit on the left side of the AR code data area. The row positioning flags and columns The positioning flags form an overlapping flag in the upper left corner, thereby forming a 6×6 resolution area.

[0111]1-2. Add a row positioning identifier of 101010 to the row positioning flag from left to right, add a column positioning identifier of 101010 to the column positioning flag from top to bottom, and overlap the identifier in the flag at the upper left corner If...

Embodiment 2

[0156] This embodiment is a robust identification of classic AR codes, and the specific method includes the following steps:

[0157] 1. Collect the AR code marked on the cylinder (see figure 1 ), get AR code area image I 0 .

[0158] 2. For AR code area image I 0 Perform adaptive threshold segmentation and morphological filtering to obtain the filtered binarized image I 1 (see image 3 ).

[0159] 3. Detection and filtering of binarized image I 1 After excluding the non-four vertices, non-convex quadrilateral contours and too small contours in the image, the contours that only contain the AR code area are obtained, and the pixels in the area other than the contours that only contain the AR code area are filled as representatives" 0" pure black, make a mask layer (see Figure 4 ), and then the AR code area image I 0 Copy it into the mask layer to get a binarized image I containing only the AR code area 2 (see Figure 5 ). The four vertices of the AR code area outlin...

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Abstract

The invention relates to a robust recognition method for an AR code marked on a cylinder, which comprises the steps of performing binarization on an AR code image, extracting the contour of a binarization image of the AR code, and performing straightening processing on an AR code regional image in the contour; performing arc distortion detection on a straightened AR code region, and rotating the straightened AR code region so as to enable a concave arc edge to face upward, and straightening the concave arc edge; straightening a convex arc edge by using a local adaptive compression algorithm so as to acquire an AR code region with the contour being rectangular; and performing nonlinear marking recognition on the AR code region. The robust recognition method provided by the invention solves problems that some traditional methods are low in recognition accuracy for the AR code and that the AR code cannot be correctly recognized when arc distortion is generated, and improves the robustness of AR code recognition.

Description

technical field [0001] The invention relates to a method for identifying an AR code, in particular to a method for robustly identifying an AR code marked on a cylinder. Background technique [0002] Augmented reality assisted maintenance technology superimposes virtual prompt information on the real scene, provides users with intuitive and flexible operation prompts in complex equipment maintenance, and can provide accurate and real-time maintenance assistance for users who are not familiar with complex equipment inspection and maintenance. It is of great significance to shorten the maintenance cycle of equipment, improve maintenance efficiency and reduce costs. [0003] The identification methods applied to augmented reality auxiliary maintenance systems generally include identification based on markers and identification based on natural features, and AR codes are typical markers applied to augmented reality systems, and have been widely used at present. However, due to t...

Claims

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Application Information

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IPC IPC(8): G06K9/20
CPCG06V10/23G06V30/10
Inventor 王伟明孙一杰杨萌何亚轩张勇闫德立靳邵云佀明华
Owner SHIJIAZHUANG TIEDAO UNIV
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