Information hiding for digital holograms by electronic partial encryption methods

Kim, Dong-Wook; Choi, Hyun-Jun; Choi, Young‐Geun; Yoo, Ji-Sang; Seo, Young-Ho

doi:10.1016/j.optcom.2007.05.065

Cited by 17 publications

(13 citation statements)

References 6 publications

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“…The obtained image (DC coefficients) is then 2DDWT'ed in the next step. As can see in the previous research [11], the result from encrypting LH subband shows the best efficiency. By considering the fact mentioned previously and examining various cases, we decided to choose the subband combinations to be encrypted as follow, which is on the assumption that 6-level MDWT is performed.…”

Section: B Hybrid Encryption Algorithmsupporting

confidence: 56%

“…In the first step, a DCT is applied to each digital hologram. The DCT was successfully applied to digital hologram encryption [11]. In the next step, called "merging", DC coefficients belonging to different segmentation images are grouped into blocks which are DWT'ed.…”

Section: B Hybrid Encryption Algorithmmentioning

confidence: 99%

“…A hologram is a relatively much expensive 3dimensional image content that, recently, researchers in many institutions around the world are studying encryption techniques for holograms. But most of them are the optical methods which use optical elements or optical parameters to hide the information [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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A Hybrid Encryption Technique for Digital Holography using DCT and DWT

Choi¹,

Seo²,

Kim³

2011

Journal of information and communication convergence engineerin

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In this paper, we present a hybrid encryption for a digital hologram which is the most valuable image content. The encryption algorithm is based on a hybrid technique implementation a fourdimensional transform combining the discrete wavelet transform(DWT) and the discrete cosine transform (DCT). The encryption scheme is composed on the basis of the energy distribution. The experimental results showed that encrypting only 0.0244% of the entire data was enough to hide the constants of the hologram. The encryption algorithm expected to be used effectively on the researches on encryption and others for digital holographic display.

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Section: B Hybrid Encryption Algorithmsupporting

confidence: 56%

Section: B Hybrid Encryption Algorithmmentioning

confidence: 99%

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A Hybrid Encryption Technique for Digital Holography using DCT and DWT

Choi¹,

Seo²,

Kim³

2011

Journal of information and communication convergence engineerin

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“…Moreover, one of the main advantages of digital holography is the convenience and flexible to implement in microscopy and measurement process considering the image storage, numerical reconstruction and transmission. Therefore, digital holography has been paid a wide attention in recent years [3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Digital Holographic System for Three-Dimensional Microstructure Measurement

Huang

Zhao

Wang

2009

2009 International Conference on Information Engineering and Computer Science

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Digital holography is a digitized holography, which is very suitable for phase imaging of microstructure object. An offaxis lensless Fourier transform digital holographic system was built and analyzed. The recording and numerical reconstruction of digital hologram was discussed. The model of phase aberration in numerical reconstruction of wavefront was presented. Experimental investigations were performed for a USAF test target. The accurate phase image was obtained by combining an automatic phase aberration compensation procedure and manual adjustment process. The lateral resolution of approaching to the theoretical limit was achieved experimentally. Also, the height profiles of the test target was obtained and given.

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“…최근에는 DWPT(discrete wavelet packet transform)을 이용하여 에너지 집중도가 높은 주파 수 대역을 탐색한 후에 해당 영역을 암호화하는 기법도 개 발되었다 [7] . [8] .…”

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Hardware Architecture of High Performance Cipher for Security of Digital Hologram

Seo¹,

Yoo²,

Kim

2012

Journal of Broadcast Engineering

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In this paper, we implement a new hardware for finding the significant coefficients of a digital hologram and ciphering them using discrete wavelet packet transform (DWPT). Discrete wavelet transform (DWT) and packetization of subbands is used, and the adopted ciphering technique can encrypt the subbands with various robustness based on the level of the wavelet transform and the threshold of subband energy. The hologram encryption consists of two parts; the first is to process DWPT, and the second is to encrypt the coefficients. We propose a lifting based hardware architecture for fast DWPT and block ciphering system with multi-mode for the various types of encryption. The unit cell which calculates the repeated arithmetic with the same structure is proposed and then it is expanded to the lifting kernel hardware. The block ciphering system is configured with three block cipher, AES, SEED and 3DES and encrypt and decrypt data with minimal latency time(minimum 128 clocks, maximum 256 clock) in real time. The information of a digital hologram can be hided by encrypting 0.032% data of all. The implemented hardware used about 200K gates in 0.25μm CMOS library and was stably operated with 165MHz clock frequency in timing simulation.

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Information hiding for digital holograms by electronic partial encryption methods

Cited by 17 publications

References 6 publications

A Hybrid Encryption Technique for Digital Holography using DCT and DWT

A Hybrid Encryption Technique for Digital Holography using DCT and DWT

Digital Holographic System for Three-Dimensional Microstructure Measurement

Hardware Architecture of High Performance Cipher for Security of Digital Hologram

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