Digital holographic video service system for natural color scene

Seo, Young-Ho; Lee, Yoon-Hyuk; Koo, Ja-Myung; Kim, Woo-Youl; Yoo, Ji-Sang; Kim, Dong-Wook

doi:10.1117/1.oe.52.11.113106

Cited by 12 publications

(8 citation statements)

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“…In the case of calculating CGHs on the RX, the object point information, rather than a hologram itself, is transmitted. The service issue requires additional explanation and discussion, which is beyond the scope of this paper [12,13].…”

Section: Hologram Video Systemmentioning

confidence: 99%

“…The Display system displays digital holograms using a spatial light modulator (SLM). If there is no holographic display, the CGHs are converted into 2-D, 3-D stereoscopic, or multi-view images, which are then displayed [12].…”

Section: Hologram Video Systemmentioning

confidence: 99%

“…We developed a new system to obtain 3-D object point information using a vertical-type hybrid camera system with an RGB and depth camera, and we used it to calculate CGHs [12]. The present paper focuses on hologram generation using GPGPUs.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High-Performance Computer-Generated Hologram by Optimized Implementation of Parallel GPGPUs

Lee¹,

Seo²,

Yoo³

et al. 2014

Journal of the Optical Society of Korea

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We propose a new development for calculating a computer-generated hologram (CGH) through the use of multiple general-purpose graphics processing units (GPGPUs). For optimization of the implementation, CGH parallelization, object point tiling, memory selection for object point, hologram tiling, CGMA (compute to global memory access) ratio by block size, and memory mapping were considered. The proposed CGH was equipped with a digital holographic video system consisting of a camera system for capturing images (object points) and CPU/GPGPU software (S/W) for various image processing activities. The proposed system can generate about 37 full HD holograms per second using about 6K object points.

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Section: Hologram Video Systemmentioning

confidence: 99%

Section: Hologram Video Systemmentioning

confidence: 99%

See 1 more Smart Citation

High-Performance Computer-Generated Hologram by Optimized Implementation of Parallel GPGPUs

Lee¹,

Seo²,

Yoo³

et al. 2014

Journal of the Optical Society of Korea

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“…서로 다른 카메라를 이용하기 때문 에 컬러 영상의 객체와 깊이 카메라로부터 획득한 거리 정보는 서로 틀어지는 현상이 생기게 된다. 따라서 두 정 보의 오차를 줄이기 위하여 콜드미러를 이용하여 카메라 쌍을 수직으로 구성한다 [17] . 또한 깊이 카메라로부터 획득한 깊이 정보는 QCIF (176x144)의 해상도로 출력한다 [7] .…”

Section: ⅰ 서 론unclassified

System Architecture for Digital Hologram Video Service

Lee¹,

Seo²,

Kim³

2014

Journal of Broadcast Engineering

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The purpose of this paper is to propose a service system for a digital hologram video, which has not been published yet. This system assumes the existing service framework for 2-dimensional or 3-dimensional image/video, which includes data acquisition, processing, transmission, reception, and reconstruction. This system includes acquisition of color and depth image pairs from a image acquisition system with vertical rigs, rectification of acquired image pairs and generating digital hologram. Also it is designed to reduce the CGH (computer-generated hologram) generation time to 1/3. It also includes some additional and optional functions such as watermarking, compression, and encryption.

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“…Because even a CGH needs a lot of time for calculations, some proposed a faster hardware implementation of a CGH method [3]. A hologram, either analog or digital, obtained either optically or by calculation, is very highly valued because its generation cost is very high and the information it contains is also very intensive [4]. Thus, there is high demanded to protect the ownership and defend against exposure to a person who is not allowed.…”

Section: Introductionmentioning

confidence: 99%

A Content Hiding Method for Digital Hologram Using Multiple Fresnel Diffraction

Seo

Lee²,

Kim

2020

Applied Sciences

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A digital hologram (DH) is so highly valued that it needs to be protected from exposure to an unpermitted person, which could be done by a content encryption. We propose an encryption scheme for digital holograms, whose goal is to hide their information with maximal visual distortion and minimal ration of the encrypted data. It uses the characteristics of the Fresnel transform and signal processing techniques. As the diffraction distance increases the region containing the object information relative to the whole diffraction plane becomes smaller. Therefore our scheme diffracts a given digital hologram twice: the first transform for reconstructing the image contained by the hologram and the second transform for concentrating the energy of the object into a small region. Then only the energy-concentrated region is encrypted to reduce the amount of data to be encrypted. Experimental results show that when the diffraction distance of the second transform is about 20 m, the encryption ratio is only 0.0058% of the hologram data, which is enough to hide the object information unrecognizably.

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Digital holographic video service system for natural color scene

Cited by 12 publications

References 0 publications

High-Performance Computer-Generated Hologram by Optimized Implementation of Parallel GPGPUs

High-Performance Computer-Generated Hologram by Optimized Implementation of Parallel GPGPUs

System Architecture for Digital Hologram Video Service

A Content Hiding Method for Digital Hologram Using Multiple Fresnel Diffraction

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