The Journal of the Convergence on Culture Technology (문화기술의 융합)

The International Promotion Agency of Culture Technology (국제문화기술진흥원)
권호 표지
DOI QR코드

DOI QR Code

A Study on the Digital Holographic Image Acquisition Method using Chroma Key Composition

크로마키 합성을 이용한 디지털 홀로그래피 이미지 획득 방법 연구

  • 김호식 (광운대학교 일반대학원 실감융합콘텐츠학과) ;
  • 권순철 (광운대학교 스마트융합대학원) ;
  • 이승현 (광운대학교 인제니움학부)
  • Received : 2022.04.30
  • Accepted : 2022.05.09
  • Published : 2022.05.31
Download PDF
⟨ Previous Next ⟩

Abstract

As 5G is getting developed, people are getting interested in immersive content. Some predicts that immersive content may be implemented in real life such as holograms, which were only possible in movies. Holograms, which has been studied for a long time since Dennis Gabor published the basic theory in 1948, are constantly developing in a new direction with digital technology. It is developing from a traditional optical hologram, which is produced by recording the interference pattern of light to a computer generated hologram (CGH) and a digital hologram printer. In order to produce a hologram using a digital hologram printer, holographic element (Hogel) image must first be created using multi-view images. There are a method of directly photographing an actual image and a method of modeling an object using 3D graphic production tool and rendering the motion of a virtual camera to acquire a series of multi-view images. In this paper, we propose a new method of getting image, which is one of the visual effect, VFX, producing multi-view images using chroma key composition. We shoot on the green screen of actual object, suggest the overall workflow of composition with 3D computer graphic(CG) and explain the role of each step. We expected that it will be helpful in researching a new method of image acquisition in the future if all or part of the proposed workflow to be applied.

5G기술의 발전과 함께 실감형 콘텐츠에 대한 관심이 커지고 있다. 영화 속에서나 가능했던 홀로그램과 같은 실감형 콘텐츠가 현실에서도 구현될 것이라는 전망이 나오고 있다. 1948년 데니스 가버가 기본 이론을 발표한 이후로 오랜 기간 연구되어 온 홀로그램 분야도 디지털 기술을 접목하여 새로운 방향으로 발전을 계속하고 있다. 빛의 간섭패턴을 기록하여 제작하는 전통적인 광학식 홀로그램으로부터 컴퓨터 형성 홀로그램 (computer generated hologram, CGH)과 디지털 홀로그램 프린터 분야로 발전하고 있다. 디지털 홀로그램 프린터를 이용해 홀로그램을 제작하기 위해서는 우선 여러 장의 다시점 이미지를 이용하여 호겔 (holographic element, Hogel) 이미지를 생성해야 한다. 연속된 다시점의 이미지를 획득하는 방법으로는 실사를 직접 촬영하는 방법과 3D 그래픽 제작 도구를 이용하여 오브젝트를 모델링하고 가상 카메라의 움직임을 렌더링하는 방법이 각각 사용되고 있다. 본 논문에서는 새로운 이미지 획득 방법으로 시각효과 (visual effect, VFX) 기법 중 한 가지인 크로마키 합성 기술을 이용해 다시점 이미지를 제작하는 방법을 제안한다. 실사를 그린 스크린 위에 배치하여 촬영하고, 3D 컴퓨터 그래픽 (comuter graphic, CG) 배경과 합성을 하는 전체 워크플로우를 제시하고, 각 단계의 역할을 설명한다. 제시된 워크플로우의 전체나 일부를 응용하면 추후 새로운 이미지 획득 방법을 연구하는 데에 도움이 될 것으로 기대한다.

Keywords

Acknowledgement

본 연구는 문화체육관광부 및 한국콘텐츠진흥원의 연구개발지원사업으로 수행되었음. (과제번호: R2021040083) 이 논문은 2021년도 광운대학교 우수연구자 지원사업에 의해 연구되었음.

References

  1. Newsis, "Hologram Conversations Like Star Wars in 2030 When 6G Became a Daily Life," NEWSIS, July 19, 2020.
  2. Hyejeong Nam, "Samsung Electronics Holds '6G Forum' to Lead Next Generation Communication Technology," Segye Ilbo, April 14, 2022.
  3. Hyung-Nam Moon, Hee-in Cho, and Youngmi Han, "Mixed Reality(MR) Technology Trends and Development Prospect," JCCT, Vol. 3, No. 3, pp.21-25, August, 2017, http://dx.doi.org/10.17703/JCCT.2017.3.3.21
  4. Shim Youn Sook, "Technology Trends of Realistic Contents and Application to Educational Contents," JCCT, Vol. 5, No. 4, pp. 315-320, November, 2019, http://dx.doi.org/10.17703/JCCT.2019.5.4.315
  5. Joon Ho Kim, Byoung Sung Lee, and Seong Jhin Choi, "A study on metaverse construction and use cases for non-face-to-face education," JCCT, Vol. 8, No. 1, pp. 483-497, January, 2022, http://dx.doi.org/10.17703/JCCT.2022.8.1.483
  6. Joy Kim, "A Study on the Metaverse as an Arts Educational Medium - Focusing on ifland of the SKT Metaverse Platform," Vol. 7, No. 4, pp. 391-396, November, 2021, http://dx.doi.org/10.17703/JCCT.2021.7.4.391
  7. JinHyeok Lim, "Kingsman hologram meeting... KT's First Live Video Conference of 'Seoul-LA'," Seoul Economics, March 5, 2019.
  8. D. Gabor, "A new microscopic principle," Nature, 161, pp. 777-778, 1948, https://doi.org/10.1038/161777a0
  9. D. Gabor, "Microscopy by reconstructed wavefronts," Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Vol. 197, No. 1051, pp. 454-487, 1949, https://doi.org/10.1098/rspa.1949.0075
  10. Soonchul Kwon, "Digital hologram making system using the depth information of an image," A doctoral dissertation, 2012.
  11. Yves Gentet, Philippe Gentet, "CHIMERA, a new holoprinter technology combining low-power continuous lasers and fast printing," Applied Optics, Vol. 58, Issue 34, pp. G226-G230, 2019, https://doi.org/10.1364/AO.58.00G226
  12. Erkhembaatar Dashdavaa, Anar Khuderchuluun, Young-Tae Lim, Seok-Hee Jeon, and Nam Kim, "Holographic stereogram printingbased on digitally computed contentgeneration platform," The International Society for Optics and Photonics (SPIE), 2019, https://doi.org/10.1117/12.2510902
  13. Half-Parallax (Horizontal-Parallax-Only) instruction, https://www.ultimate-holography.com/chimera
  14. Junsu Kim, "Chroma Keying in Video Compositing with Matting," Korea Design Knowledge Society, 2015, DOI : 10.17246/jkdk.2015..34.024
  15. Junsu Kim, "A Case Study on VFX Production using a Matchmoving Techniques," Korea Digital Design Council, Journal of Digital Design, Vol. 10, No. 1, pp. 255-264, 2010, DOI : 10.17280/jdd.2010.10.1.025
  16. Ik Heui Lee, "Visual Effect and Application of Stereoscopic 3D Image Using Timelapse," Korea Science & Art Forum, Vol. 18, pp. 509-518, 2014, DOI : 10.17548/ksaf.2014.12.18.509
  17. Basic Tutorials, https://lrtimelapse.com/tutorial/basic/
  18. After Effects Tutorial - Warp Stabilizer, https://youtu.be/i-WuS2r8750
  19. How To Stabilize Motion In After Effects, https://youtu.be/q2lzMKkq_cg
  20. Junsang Lee, Junhong Park, and Imgeun Lee, "Video Production Method using Match Moving Technique," J. Korea Inst. Inf. Commun. Eng., Vol. 20, No. 4, pp. 755-762, April, 2016, http://dx.doi.org/10.6109/jkiice.2016.20.4.755
  21. Sungju Youm, "A Case Study of Efficient match moving method for Film Industrial Business," Global e-Business Association, The e-Business Studies, Vol. 15, No. 6, December, pp. 213-230, 2014.
  22. https://www.videocopilot.net/products/element2/
  23. Advanced Keying Techniques in After Effects - Tutorial, https://youtu.be/paYuWCEZ2Kg