JAE-SANG HYUN

The importance of vision system in Robotics becomes more significant. Especially, in unstructured enviroments such as construction sites, the performance of vision system to recognize the surrounding environment is much lower than the level of tasks that robots can complete. With the help of commercialized 3D sensors, many robots utilize the 3D sensor as eyes, however, the accuracy and resolutio..

Depending on the applications of the 3D sensing, we need to customize 3D scanners. For example, the system in the figure achieves a speed of 3D sensing up to 10,000 Hz and sub-pixel error for studies of flapping bird or vibration in manufacturing. I can develop the system for each application, using CMOS / CCD cameras and different types of projection patterns (laser speckle pattern/ statistical..

Using structured light for 3D reconstruction is preferrable for high-accuracy and high-speed 3D model acquisition, since users can control the patterns (signal) to be projected on objects (Active method of 3D reconstruction). Main research focuses on the pattern algorithm development and mathematical analysis for the 3D result.

- Purdue University: Ph.D., Mechanical Engineering (May. 2020 Expected) - Purdue University: M.S., Mechanical Engineering (May. 2019) - Yonsei University: B.S., Mechanical Engineering (Mar. 2015)

Jae-Sang Hyun is attending SPIE Optics+Photonics at San Diego convention center to give a presentation. (11102-7) Say Hello to him!

The number of patterns used to reconstruct one 3D image is of great importance to high-speed 3D shape measurement. This paper presents a method to reduce the number of patterns by using Hilbert transform with only three binary patterns. Two fringe patterns at different frequencies and one DC component pattern are used for absolute phase retrieval. We directly applied Hilbert transform to the diffe..

This paper presents a method to overcome the light spectral range limitation of using digital-light-processing (DLP) projector for 3D shape measurement by developing a mechanical projector. The mechanical projector enables much broader spectral range of light than that the DLP projector allows. The rapidly spinning disk with binary structures can generate desired sinusoidal patterns at a frequen..

Paper Title: Phase-based Stereo Matching for High-accuracy Three-dimensional Optical Sensing Presenting Author: Jae-Sang Hyun Session Time and Dates: September 18, 2019 from 5:15 PM to 6:45 PM Session Title: 3D and Light -Field Optics

One of the major challenges of employing a two-frequency (or -wavelength) phase-shifting algorithm for absolute three-dimensional (3D) shape measurement is its sensitivity to noise. Therefore, three- or morefrequency phase-shifting algorithms are often used in lieu of a two-frequency phase-shifting algorithm for applications where the noise is severe. This paper proposes a method to use geometri..

This paper presents a method that recovers high-quality 3D absolute coordinates point by point with only five binary patterns. Specifically, three dense binary dithered patterns are used to compute the wrapped phase; and the average intensity is combined with two additional binary patterns to determine fringe order pixel by pixel in phase domain. The wrapped phase is temporarily unwrapped point ..