Dot-like distribution cooperative coding mark and its identification and positioning method

Abstract

The invention discloses a dot-shaped distributed cooperative coding mark and its identification and positioning method. The coding mark includes at least 6 circular mark points, the mark points include mark points A, B, C, O, and the positioning point includes a positioning point D. The other mark points are code points. Mark points A, B, C, and D are respectively located on the four corners of a square, and mark point A and anchor point D are located on the same diagonal line of the square, and mark point O is located at On the extension line of the line between marking point A and anchor point D, define the origin of the coded logo design coordinate system as marking point O, and the X-axis and Y-axis of the coded logo design coordinate system are parallel to the sides of the square. The points are distributed near the X axis and the Y axis, and the code points at different positions correspond to unique coded character values, and the coded character values ​​corresponding to each code point are combined into a unique coded value. The invention can realize a large number of unique coded marks, and its recognition algorithm is simple and fast, and the coded marks are positioned accurately.

Description

technical field [0001] The invention belongs to the technical field of digital close-range photogrammetry, and in particular relates to a dot-shaped distribution cooperative coding mark and an identification and positioning method suitable for large-scale structures and dynamic measurement objects. Background technique [0002] When performing dynamic measurements on large-scale structures within a large field of view, the surface of the structure often lacks clear and recognizable texture features, which makes it difficult to directly, quickly and accurately extract feature information on the surface of the structure, which cannot meet the experimental requirements. At present, the method of artificially laying cooperation signs on the structure under test is usually used to generate feature points for identification and tracking. Therefore, the design and application of artificial cooperation signs with unique code values ​​have received extensive research and attention. Ho...

AI Technical Summary

Problems solved by technology

For example, "a new measurement point coding method and recognition algorithm" proposed by Wang Chaoyin et al. is a kind of recognition of circular coding signs. limitation

[0003] In the related dot-distributed coding mark technology, the positions of the code points designed are generally closely arranged. In order to ensure accurate decoding and recognition, the code points in the same code mark cannot be adjacent to each other. In this way, in the limited design code point space In , the number of permutations and combinations of code points is greatly limited, and it is difficult to generate a rich number of unique codes

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