Abstract
Coded mark point, as an important part of automatic matching, is widely used in stereo vision and photogrammetry. An encoding scheme named the Initial Dot encoding scheme, has been designed based on the programme of concentric rings, and which is able to solve restrictions on the number of codes and promote the stability of decoding. The designed coding pattern includes three functional points: locating point, start point and coded point. The maximum coding number of the Initial Dot scheme can reach 262,144 when the number of code bits is 18. The recognition experiments show that the Initial Dot encoding scheme can achieve 100% recognition rate at a 75 degree angle, which is very difficult for other coding schemes. By comparing experiments with the Schneider encoding scheme for a large flexible panel, the recognition rate of the proposed scheme is 99%, which is higher than the recognition rate of 90% of the Schneider scheme. The experimental results indicate that the Initial Dot encoding scheme can be successfully applied on flexible solar panels under a 1000 mm × 500 mm field of view.
Highlights
Vision measurement with its advantages of non-contact, high precision, high efficiency and good stability has a wide range of applications in large field-of-view measurements [1,2]
Compared with the traditional coded scheme, the number of the coded mark of Initial Dot scheme is improved by about ten times
Through the comparison between the scheme and the Schneider scheme, it is proved that the scheme has better stability than the Schneider scheme when the coded size is above 15mm, especially when the shooting angle is greater than 45 degrees
Summary
Vision measurement with its advantages of non-contact, high precision, high efficiency and good stability has a wide range of applications in large field-of-view measurements [1,2]. It is necessary to design a coding scheme which can satisfy the coding number and satisfy the decoding stability to meet the measurement requirements under a large field of view [6]. At this stage, the coded mark points have a good application prospect in measurement [7,8]
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