Extraction of a Distance Parameter in Optical Scanning Holography Using Axis Transformation

et al. 2016

ETRI J

For the implementation of a real‐time holographic camera, fast and automatic holographic image reconstruction is an essential technology. In this paper, we propose a new automatic depth‐detection algorithm for fast holography reconstruction, which is particularly useful for optical scanning holography. The proposed algorithm is based on the inherent phase difference information in the heterodyne signals, and operates without any additional optical or electrical components. An optical scanning holography setup was created using a heterodyne frequency of 4 MHz with a 500‐mm distance and 5‐mm depth resolution. The reconstruction processing time was measured to be 0.76 s, showing a 62% time reduction compared to a recent study.

Section: Fast Holographic Image Reconstruction Usingmentioning

confidence: 99%

Fast Holographic Image Reconstruction Using Phase Shifting-assisted Depth Detection Scheme in Optical Scanning Holography

Lee

Min

et al. 2016

ETRI J

“…이 방법들은 탐색 알고 리즘이나 검색 알고리즘 등을 통해서 홀로그램이 복원되는 깊이 위치를 찾아내는 방식들이다 [5][6][7][8][9] . Real-only 홀로그램으로 합성하는 과정은 다음과 같다.…”

Section: 부분 선택법unclassified

Auto-focus of Optical Scanning Holographic Microscopy Using Partial Region Analysis

Kim¹,

Korean Journal of Optics and Photonics

2011

Self Cite

In this paper, we propose an auto-focusing algorithm which extracts a depth parameter by analyzing a selected part of a hologram, and we use experimental results to show that the algorithm is practical. First, we record a complex hologram using Optical Scanning Holography. Next we select some part of hologram and extract depth information through Gaussian low pass filtering, synthesizing a real-only hologram, power fringe-adjusted filtering and inverting to a new frequency axis. Finally, we reconstruct the hologram automatically using the extracted depth location.

“…Much research has been carried out concerning 3D displays [1][2][3][4][5][6][7][8]. Among them, stereoscopic displays with special glasses or autostereoscopic multi-view displays with a few viewpoints are the representative 3D display technologies being deployed on a commercial scale.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional Binocular Holographic Display Using Liquid Crystal Shutter

Journal of the Optical Society of Korea

Jeong

et al. 2011

We present a novel approach to the holographic three-dimensional display using a liquid crystal shutter for binocular display applications. One of the difficult problems in implementing a binocular holographic three-dimensional display is the extremely narrow viewing angle. This problem is attributed to the spatial light modulator pixel number which restricts the maximum spatial bandwidth of the spatial light modulator. In our proposed method, a beam splitter and liquid crystal shutter are used to present two holograms of a three-dimensional scene to the corresponding eyes. The combination of holographic display and liquid crystal shutter can overcome the problem of the extremely narrow viewing angle, presenting threedimensional images to both eyes with correct accommodation depth cues.