Method for decoding parallelogram coded mark based on graphic geometrical relationship

Abstract

The invention discloses a method for decoding parallelogram coded mark based on a graphic geometrical relationship, the parallelogram coded mark is composed of a parallelogram background pattern and a coding pattern, the coding pattern is arranged in the parallelogram background pattern and comprises a positioning pattern, a directional pattern and a coding combination pattern, the directional pattern and the positioning pattern are used for judging the direction of the parallelogram coding mark; and the coding combination pattern is used for coding four vertexes of the coding mark. The coding pattern in the parallelogram coding mark provided by the invention can automatically judge the relative rotation direction of the detected target and the camera in the processes of camera calibration, three-dimensional data splicing and the like, and the flexibility is improved; the positions of the patterns of the constituent parts are distinguished through a graph geometrical relationship and a vector product method, and the robustness is high; according to a decoding method, the decoding accuracy is greatly improved; the invention has the advantages of high efficiency and high decoding speed, and can realize real-time decoding.

Description

technical field [0001] The invention relates to the field of visual measurement in computer vision, in particular to a decoding method of a parallelogram coded mark based on graphic geometric relations, which is applicable to the fields of camera calibration, target feature extraction, stereo matching, three-dimensional data splicing and the like. Background technique [0002] In visual measurement, feature recognition and matching of measured objects is one of the research hotspots in this field. However, in the case of high-resolution large field of view or other complex backgrounds, the accuracy of feature extraction and matching cannot meet the accuracy requirements, and by setting coded marks on the surface of the measured object, the current feature extraction and matching can be greatly improved. Speed ​​and accuracy, and can also solve the matching problem of multiple images. Therefore, the design and identification of coded signs is a key link in visual measurement...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at overcoming the defects of the existing coded marks, and proposes a decoding method for parallelogram coded marks based on graphic geometric relations, which is suitable for multi-eye stereo vision calibration under a large field of view, and has great advantages for affine transformed images. Good stability, large coding capacity, high coding precision and accuracy for larger objects

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