Browse > Article
http://dx.doi.org/10.3807/HKH.2008.19.6.394

Integral Imaging System Enabling Enhanced Depth of Field Incorporating a Birefringent Liquid Crystal Lens Array  

Park, Chan-Kyu (Department of Electronic Engineering, Kwangwoon University)
Hwang, Yong-Seok (Department of Electronic Engineering, Kwangwoon University)
Lee, Sang-Shin (Department of Electronic Engineering, Kwangwoon University)
Publication Information
Korean Journal of Optics and Photonics / v.19, no.6, 2008 , pp. 394-399 More about this Journal
Abstract
An integral imaging system enabling enhanced depth of field by incorporating a pair of liquid-crystal (LC) lens arrays was proposed and demonstrated. The lens arrays exhibit two different refractive indexes depending on the light polarization. The proposed LC lens array I and II were implemented by depositing a ZLI-4119 LC and an E-7 LC, respectively, on top of a lens-array substrate in glass. When the two LC lens arrays were aligned appropriately, a birefringence was obtained for a specific light polarization in such a way that the incoming light sees different refractive indexes for them. As a result, the focal length associated with the imaging system utilizing the LC lens arrays was adaptively varied, thereby enhancing the depth of field for the image reconstruction. We have theoretically analyzed the proposed integral imaging system with the $LightTools^{(R)}$ to confirm that the focal length could be adjusted with the help of the birefringent lens array. Finally the proposed imaging system successfully reconstructed the objects. The birefringent lens array employing the ZLI-4119 LC produced a real image with the focal length of 680 mm, while the other using the E-7 LC yielded a virtual image with the focal length of -29 mm.
Keywords
3차원 디스플레이;집적영상;액정;가변 초점;렌즈어레이;이미지 복원;
Citations & Related Records
연도 인용수 순위
  • Reference
1 G. Lippmann, “La photograhie integrale,” Compt. -Rend. Acad. Sci., vol. 146, pp. 446-451, 1908
2 F. Okano, H. Hoshino, J. Arai, and I. Yuyama, “Real-time pickup method for a three-dimensional image based on integral photography,” Appl. Opt., vol. 36, no. 7, pp. 1598-1603, 1997   DOI
3 N. Davies, M. McCormick, and L. Yang, “Three-dimensional imaging systems: a new development,” Appl. Opt., vol. 27, no. 21, pp. 4520-4528, 1988   DOI
4 B. Lee, S, Jung, and J.-H Park, “Viewing-angle-enhanced integral imaging by lens switching,” Opt. Lett., vol. 27, no. 10, pp. 818-820, 2002   DOI
5 Y. Kim, J. Park, H. Choi, J. Kim, S. Cho, and B. Lee, “Depth-enhanced three- dimensional integral imaging by use of multilayered display devices,” Appl. Opt., vol. 45, no. 18, pp. 4334-4343, 2006   DOI
6 Y. S. Hwang, T. H. Yoon, J. C. Kim, “Design and fabrication of variable focusing lens arrays using liquid crystal for integral photography,” Jpn. J. Appl. Phys., vol. 42, no. 5, pp. 6434-6440, 2003   DOI
7 J. Park, S. Jung, H. Choi, and B. Lee, “Integral imaging with multiple image planes using a uniaxial crystal plate,” Opt. Exp., vol. 11, no. 16, pp. 1862-1875, 2003   DOI
8 J. Lee, S. Kim, and E. Kim, “Reconstruction of a threedimensional object and system analysis using ray tracing in practical integral imaging system,” Proc. SPIE, vol. 6695, pp. 19-27, 2007   DOI
9 Y. Kim, H. Choi, J. Kim, S.-W. Cho, Y. Kim, G. Park, and B. Lee, “Depth-enhanced integral imaging display system with electrically variable image planes using polymer-dispersed liquid crystal layers,” Appl. Opt., vol. 46, no. 18, pp. 3766-3773, 2007   DOI
10 C. K. Park, Y. S. Hwang, and S. S. Lee, “Integral imaging system with enhanced depth of field using birefringence lens array,” Proc. IMID, vol. 8, pp. 1135-1137, 2008