Point-like distribution cooperation coding sign and identification and positioning method

Abstract

The invention discloses a point-like distribution cooperation coding sign and an identification and positioning method. The coding sign comprises at least 6 circular sign points. The sign points comprise mark points A, B, C and O. A positioning point comprises a positioning point D. Other sign points are coding points. The mark points A, B, C, and O are located at the four vertex angles of a square respectively, and the mark point A and the positioning point D are located at the same diagonal line of the square. The mark point O is located at the extension line of a connection line between themark point A and the positioning point D, and the original point of a coding sign design coordinate system is defined as the mark point O. The X axis and the Y axis of the coding sign design coordinate system are parallel to the sides of the square. Each coding point is distributed near the X axis and the Y axis, and the coding points at different positions correspond to unique coding character values. The coding character values corresponding to each coding point form a unique coding value. In the invention, a rich number of unique coding signs can be realized, and a recognition algorithm issimple and fast, and the coding sign is 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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