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Identification method of point-distributed coded marks

A technology of encoding marks and identification methods, applied in the field of industrial digital photogrammetry, can solve the problems that cannot meet the needs of industrial digital photogrammetry

Active Publication Date: 2010-10-06
THE PLA INFORMATION ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The existing dot-distributed coded mark can produce 420 different coded values, which is much larger than the coded capacity of the concentric ring-shaped coded mark, but it still cannot meet the needs of existing industrial digital photogrammetry. Therefore, it is necessary to design a new The point distribution coding mark and its identification method to meet the needs of the rapidly developing industrial digital photogrammetry

Method used

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  • Identification method of point-distributed coded marks
  • Identification method of point-distributed coded marks
  • Identification method of point-distributed coded marks

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Embodiment Construction

[0018] The identification mark corresponding to the point distribution coding mark identification method of the present invention is as follows: figure 1 As shown, the coding mark includes a square coding surface, on which there are 8 circular reflective mark points of the same size, among which points 1 to 5 are template points, the other 3 points are coding points, and point 3 is Locating points, points 1~3 are collinear on the Y axis, points 4 and 5 are collinear on the X axis, and are symmetrical about the Y axis, and points 1, 2, and 3 are located on the upper side of the X axis and to the X axis The distance is from far to near, and there are 20 design mark points on the upper side of the X axis with the Y axis as the symmetrical axis and the same direction as point 1. For three of the mark points, the 20 design mark points are equally divided into two groups and listed on the left and right sides of the Y axis. Each group of 5 points is closely arranged in one column, a...

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Abstract

The invention relates to an identification method of point-distributed coding marks, comprising the following steps of: firstly, determining an initial point set and searching a point 3, a point 1 and a point 2; secondly, searching a point 4 and a point 5; and finally carrying out affine transformation and determining a coded value until all coded marks are identified. By using the method, accurate identification of all coded marks can be realized and the reasonability of the design of all point-distributed coding marks can be verified simultaneously.

Description

technical field [0001] The invention relates to a method for identifying a point-distributed coding mark, which belongs to the technical field of industrial digital photogrammetry. Background technique [0002] Photogrammetry usually requires the surface of the measured target to have rich and obvious texture information in order to extract sufficient and accurate feature points in image processing, while the surface of industrial parts usually lacks texture and cannot meet this requirement. Therefore, in industrial digital photogrammetry, the method of laying artificial marker points is often used to generate a sufficient number of feature points with obvious contrast. [0003] The coded mark is a special measurement mark, and each coded mark corresponds to a unique code (identification code), which can be automatically identified by digital image processing technology. The function of the coding mark mainly has two aspects: it is used in conjunction with the orientation t...

Claims

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Application Information

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IPC IPC(8): G06K9/62G01C11/00
Inventor 李广云李宗春冯其强
Owner THE PLA INFORMATION ENG UNIV
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