LEE Changjoo
| Department of Engineering Science | Assistant Professor |
| Cluster III (Fundamental Science and Engineering) | Assistant Professor |
Researcher Information
Degree
Field Of Study
Career
Educational Background
- Apr. 2021 - Mar. 2025
Kansai University, Graduate School of Science and Engineering, Integrated Science and Engineering Major, Japan - Mar. 2019 - Feb. 2021
Kyungpook National University, School of Electronic and Electrical Engineering, Optoelectronics and Electromagnetic wave Engineering, Korea, Republic of - Mar. 2012 - Feb. 2019
Pusan National University, College of Natural Science, Department of Physics, Korea, Republic of
Research Activity Information
Award
Paper
- Correction of the wavelength error in transmission of a full-color holographic 3D image
Chang-Joo Lee; Hirohito Nishi; Kyoji Matsushima
Lead, Optics Express, Optica Publishing Group, 32, 10, 17012-17027, 23 Apr. 2024, Peer-reviwed, When a digital holographic image represented by a sampled wavefield is transmitted and the wavelength used in the three-dimensional (3D) display devices does not agree exactly with the wavelength of the original image data, the reconstructed 3D image will differ slightly from the original. This slight change is particularly problematic for full-color 3D images reconstructed using three wavelengths. A method is proposed here to correct the holographic image data and reduce the problems caused by wavelength mismatch. The effectiveness of the method is confirmed via theoretical analysis and numerical experiments that evaluate the reconstructed images using several image indices.
Scientific journal, English - Rapid calculation of CGH using the multiplication of down-scaled CGH with shifted concave lens array function
Chang-Joo Lee; Seung-Yeol Lee
Lead, Current Optics and Photonics, 6, 1, 51-59, 25 Feb. 2022, Peer-reviwed
Scientific journal, English - Extremely high-definition computer generated hologram calculation algorithm with concave lens function
Chang-Joo Lee; Woo-Young Choi; Kwan-Jung Oh; Keehoon Hong; Kihong Choi; Sang-Hoon Cheon; Joongki Park; Seung-Yeol Lee
Lead, Korean Institute of Broadcast and Media Engineers, 25, 6, 836-844, 30 Nov. 2020, Peer-reviwed
Scientific journal, Korean - Numerical analysis on a viewing angle enhancement of a digital hologram by attaching a pixelated random phase mask
Woo-Young Choi; Chang-Joo Lee; Bum-Su Kim; Kwan-Jung Oh; Keehoon Hong; Hyon-Gon Choo; Jisun Park; Seung-Yeol Lee
Applied Optics, Optica Publishing Group, 60, 4, A54-A61, 16 Oct. 2020, Peer-reviwed, In a digital hologram, the maximum viewing angle of a computer-generated hologram (CGH) is limited by pixel pitch due to the diffraction grating equation. Since reducing pixel size of display panel is challenging and costly, we propose a method to expand the viewing angle of a digital hologram by attaching an aligned pixelated random phase mask (PRPM) onto the CGH pattern based on analysis of simulation results. By introducing a phase-averaging process to the widely used iterative Fourier transform algorithm, an optimized CGH pattern can be obtained in conjunction with a PRPM. Based on scalar diffraction theory, viewing angle enhancement characteristics were verified by comparing the perspective views of a two-plane hologram using a virtual eye model. In addition, we performed full electromagnetic simulations that included effects due to potential fabrication errors such as misalignment, thickness variation, and internal reflections and diffractions between the CGH and random mask patterns. From the simulation results, by attaching a 1.85 µm-sized pixel pitch PRPM to a 3.7 µm CGH, the viewing angle can be easily expanded almost identical to that of a CGH with 1.85 µm-pixel pitch.
Scientific journal, English
Lectures, oral presentations, etc.
- Integrated correction for mixed error in parameter of full-color object wavefield
Chang-Joo Lee; Hirohito Nishi; Kyoji Matsushima
Oral presentation, English, Proc. SPIE 13917, Practical Holography XXXX: Displays, Materials, and Applications, Peer-reviewed
20 Jan. 2026
17 Jan. 2026- 23 Jan. 2026 - Recent Techniques in Full-Color Large-Scale Computer Holography
Kyoji Matsushima; Hirohito Nishi; Chang-Joo Lee; Takeshi Imai; Shunsuke Fujiki; Ryosuke Katsura
Invited oral presentation, English, The 24th International Meeting on Information Display, Peer-reviewed
22 Aug. 2024
20 Aug. 2024- 23 Aug. 2024 - Correction of parameter mismatches in transmission of holographic 3D images
Chang-Joo Lee; Hirohito Nishi; Kyoji Matsushima
Oral presentation, English, The 24th International Meeting on Information Display, Peer-reviewed
21 Aug. 2024
20 Aug. 2024- 23 Aug. 2024 - Correction algorithm for wavelength mismatch of sampled wavefield in full-color computer holography
C.-J. Lee; H. Nishi; K. Matsushima
Oral presentation, English, 12th International Symposium on Display Holography, Peer-reviewed
29 Jun. 2023
26 Jun. 2023- 01 Jul. 2023 - Computation techniques in tera-pixel-scale full-parallax computer holography for 3D display
K. Matsushima; H. Nishi; R. Katsura; C.-J. Lee
Invited oral presentation, English, The 12th Laser Display and Lighting Conference 2023, Peer-reviewed
21 Apr. 2023
17 Apr. 2023- 21 Apr. 2023 - カラーコンピュータホログラフィにおける波長誤差の補正アルゴリズム
Lee Changjoo; 西 寛仁; 松島恭治
Oral presentation, Japanese, HODIC学生シンポジウム, Peer-reviewed
22 Feb. 2023
22 Feb. 2023- 22 Feb. 2023 - Digital hologram calculation methods for enhancing viewing angle, computation speed, and depth extraction
Seung-Yeol Lee; Woo-Young Choi; Chang-Joo Lee; Joongki Park
Invited oral presentation, English, Digital holography and Information Photonics 2020, Peer-reviewed
18 Dec. 2020
18 Dec. 2020- 18 Dec. 2020 - Extremely High-Definition Computer Generated Hologram Calculation Algorithm with Concave Lens Function
Seung-Yeol Lee; Chang-Joo Lee; Woo-Young Choi; Kwan-Jung Oh; Keehoon Hong; Kihong Choi; Sang-Hoon Cheon; Joongki Park
Oral presentation, Korean, Proceedings of the Korean Society of Broadcast Engineers Conference, Peer-reviewed
15 Jul. 2020
13 Jul. 2020- 15 Jul. 2020 - Study on Increasing the Viewing Angle of the Computer Generated Hologram via Random Pixelated Phase Mask
Woo-Young Choi; Chang-Joo Lee; Bum-Su Kim; Kwan-Jung Oh; Keehoon Hong; Hyon-Gon Choo; Jisun Park; Seung-Yeol Lee
Poster presentation, Korean, Proceedings of the Korean Society of Broadcast Engineers Conference, Peer-reviewed
13 Jul. 2020
13 Jul. 2020- 15 Jul. 2020 - Reforming of Computer Generated Hologram Pattern through Angular Spectrum Domain Computation
Chang Joo Lee; Woo Young Choi; Joong Ki Park; Kwan Jung Oh; Kee Hoon Hong; Ki Hong Choi; Seung Yeol Lee
Poster presentation, English, OPTICS & PHOTONICS International Congress 2020, Peer-reviewed
22 Apr. 2020
20 Apr. 2020- 24 Apr. 2020 - Interpolation and shifting of digital holograms through computations on spatial frequencies domain
Chang-Joo Lee; Woo-Young Choi; Joongki Park; Kwan-Jung Oh; Keehoon Hong; Kihong Choi; Seung-Yeol Lee
Poster presentation, Korean, Digital Holography and Information Photonics 2019, Peer-reviewed
18 Dec. 2019
17 Dec. 2019- 20 Dec. 2019
