[논문]Development of 3D scanner using structured light module based on variable focus lens

Kim, Kyu-Ha; Lee, Sang-Hyun

doi:10.17703/ijact.2020.8.3.260

Development of 3D scanner using structured light module based on variable focus lens 원문보기

The International journal of advanced culture technology, v.8 no.3, 2020년, pp.260 - 268

Kim, Kyu-Ha (LINC+ (Leaders in Industry-university Cooperation), Honam University) , Lee, Sang-Hyun (Dept. of Computer Engineering, Honam University)

Abstract ▼ AI-Helper

Currently, it is usually a 3D scanner processing method as a laser method. However, the laser method has a disadvantage of slow scanning speed and poor precision. Although optical scanners are used as a method to compensate for these shortcomings, optical scanners are closely related to the distance and precision of the object, and have the disadvantage of being expensive. In this paper, 3D scanner using variable focus lens-based structured light module with improved measurement precision was designed to be high performance, low price, and usable in industrial fields. To this end, designed a telecentric optical system based on a variable focus lens and connected to the telecentric mechanism of the step motor and lens to adjust the focus of the variable lens. Designed a connection structure with optimized scalability of hardware circuits that configures a stepper motor to form a system with a built-in processor. In addition, by applying an algorithm that can simultaneously acquire high-resolution texture image and depth information and apply image synthesis technology and GPU-based high-speed structured light processing technology, it is also stable for changes to external light. We will designed and implemented for further improving high measurement precision.

주제어

표/그림 (10)

그림 Figure 1. Variable focus lens 2D and 3D design
그림 Figure 3. Camera-Process for implementing projector calibration
그림 Figure 3. Process for 3D point cloud creation
그림 Figure 4. Triangulation principle of structured light type 3D scanner (left), prototype of structured light type 3D scanner with variable focus lens (right)
표 Table 1. Development specifications of 3D scanning
그림 Figure 5. Embedded board circuit diagram for integrated power supply and lens control of 3D scanner
그림 Figure 6. Sample
그림 Figure 7. Filtering extraction point data screen and 3D Point Clouds
그림 Figure 8. Manufactured 3D scanner system
그림 Figure 9. 3D Scanner system produced as a result of research

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문제 정의

3D scan data and actually designed 3D design data of parts are required for deviation analysis by utilizing 3D scan data acquired through technology development results in this paper. In order to acquire such data, it was tested using the Geomagic tool, and by performing deviation analysis as a result of the test, it is possible to visually express the deviation between the design data and the produced product.

제안 방법

Here, the correction supports a function that can be photographed by examining a stripe pattern and a screen mode capable of checking photographed image information. Also, it is developed to support camera power ON/OFF, laser ON/OFF, motor rotation, calibration value correction, camera brightness correction, and camera view function.
It is a technique of acquiring three-dimensional coordinates of the detected point. First, calibration of the camera and projector must be performed in order to calculate the three-dimensional coordinates of the coincidence point. In addition, the accuracy of the restored three-dimensional shape is affected by the camera and projector calibration results.
3D scan data and actually designed 3D design data of parts are required for deviation analysis by utilizing 3D scan data acquired through technology development results in this paper. In order to acquire such data, it was tested using the Geomagic tool, and by performing deviation analysis as a result of the test, it is possible to visually express the deviation between the design data and the produced product.
This paper designed 3D scanner using variable focus lens-based structured light module that improved measurement precision for use in industrial sites with high performance, low price. In order to solve this structural problem, designed a telecentric optical system based on a variable focus lens, and was connected to a telecentric mechanism of the step motor and lens for adjusting the focus of the variable lens.
In order to distinguish between the coordinates of the corner point obtained in this way and distinct from another corner point, let's call it the outer corner point. In this study, harris corner Algorithm was used for acquisition of the outer corner point. The four external corner points obtained from the camera image are named each camera corner: C₁, camera corner: C₂, camera corner: C₃, and camera corner: C₄.
Corresponding to projector's outer corner points P₁, P₂, P₃, and P₄ must be obtained. In this study, projecting one marker into the pattern and matching the center of the marker with each corner get the projector corner point. This process is the corner point tracking [10].
Among the active sensor-based, the method that has attracted the most attention in recent years is a method using structured light. This method projects a pre-designed 2D pattern onto a stationary object and takes a camera to analyze the deformation and distortion of the pattern to extract 3D information of the object. At this time, the pattern used is various in color and shape such as binary, color, and stripes, and it is possible to acquire a model with accuracy similar to that of 3D scanner using structured light and configure a relatively low-cost system.
This study developed the variable focus lens to make a low price and high precision 3D scanner usable in the manufacturing industry. The variable focus lens was designed as to be able to adjust the distance of the focal point through rotational movement of the lens barrel made of a telecentric optical system.
When the deviation analysis of the 3D scanner using the variable focus lens-based structured light module manufactured and researched in this paper performs deviation analysis, the deviation between the design data and the produced product is visually expressed, and the size of the deviation up to 10µ units. It was confirmed that it was possible to measure very accurately.

대상 데이터

The image data captured by the hardware device is analyzed by software to generate three-dimensional data. The software consists of a 3D scanner calibration module, a structured light pattern repeats imaging module, and an object junction module. In order to calibrate the position and angle of the scanner devices, 3D scanner calibration was applied to correct the projection position of the projector and the camera angle using a marker based image processing technique.

참고문헌 (12)

Edmund Optics, The Advantages of Telecentricity (Application Notes, Imaging Resource Guide), Section 5.1.
S. I. Son., D. Pugal., T. Hwang., H. R. Choi., J. C. Koo., Y. Lee., K. Kim., and J.-D. Nam, "Electromechanically driven variable-focus lens based on transparent dielectric elastomer," Appl. Opt., Vol. 51, No. 15, pp. 2987-2996, 2012. DOI: 10.1364/AO.51.002987

상세보기
L. Zhang, B. Curless, and S.M. Seitz, "Space time Stereo: Shape Recovery for Dynamic Scenes," Comput. Vision Pattern Recognit, pp. 367-374. June 2003. DOI: 10.1109/CVPR.2003.1211492
O. Alexander et al., "Creating a Photoreal Digital Actor: The Digital Emily Project," Eur. Conf. Visual Media Production, 2009. DOI: 10.1109/CVMP.2009.29
K. H. Jeong., G. Liu., N. Chronis., and L. Lee., "Tunable microdoublet lens array," Opt. Express, Vol. 12, No. 11, pp. 2494-2500, 2004. DOI: 10.1364/OPEX.12.002494

상세보기
N. T. Nguyen, "Micro-optofluidic Lenses: A review: Biomicrofluidics," Vol 4, No 3, pp. 031501(1) - 031501(15), 2010. DOI: 10.1063/1.3460392

상세보기
F. Carpi., G. Frediani., S. Turco., and D. Rossi., "Bioinspired tunable lens with muscle-like electroactive elastomers," Advanced Function. Mater, 21, pp. 4152-4158, 2011. DOI: 10.1002/adfm.201101253

상세보기
S. Shian., R. M. Diebold., and D. R. Clarke., "Tunable lenses using transparent dielectric elastomer actuators," Optics Express, Vol. 21, Issue 7, pp. 8669-8676, 2013. DOI: 10.1364/OE.21.008669

상세보기
Y-. C. Choi., C-. S. Rim, "Design of a Telecentric Lens with a Smartphone Camera to Utilize Machine Vision," Korean Journal of Optics and Photonics, Vol. 29, No. 4, pp. 149-158, 2018. DOI: 10.3807/KJOP.2018.29.4.149
S-. Y. Park？, G. G. Park？, L. Zhang., "An Easy Camera-Projector Calibration Technique for Structured Light 3-D Reconstruction," The KIPS Transactions: Part B, Vol. 17B, No. 3, pp. 215-226. 2010. DOI: 10.3745/KIPSTB.2010.17B.3.215

원문보기 상세보기
http://www.meshlab.net/
Sang-Hyun Lee, "Research and development of haptic simulator for Dental education using Virtual reality and User motion," International Journal of Advanced Culture Technology(IJACT), 64, pp. 52-57, 2018. DOI: 10.17703//IJACT2018.6.4.52

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