Digital hologram encryption using discrete wavelet packet transform

Seo, Young-Ho; Choi, Hyun-Jun; Kim, Dong-Wook

doi:10.1016/j.optcom.2008.10.028

Cited by 17 publications

(15 citation statements)

References 12 publications

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“…where H and W are width and height of the original picture, and P (x, y) and C (x, y) represent the gray scale intensity The lower PSNR values of the encrypted picture indicate the difficulty in the recovery of the original picture from the encrypted picture without having the correct decryption key [1,7,8,25]. The obtained results for different modes of A5/1 and W7 encryption algorithms as well as the different encrypted frames are available in Tables 1 and 2.…”

Section: The Peak Signal To Noise Ratio Of the Encrypted Framesmentioning

confidence: 99%

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Encryption of Video Main Frames in the Field of DCT Transform Using A5/1 and W7 Stream Encryption Algorithms

Bahrami

Naderi

2014

Arab J Sci Eng

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Recently, creating security in multimedia systems involving video has become one of the main needs in commercial and military usages. The most important traits of video frames are simultaneousness of frames and high volume of information. Considering these features, A5/1 and W7 stream ciphers are used for video main frames in the field of selective encryption of each DCT transform coefficient.In addition, a suitable method is expressed in order to select the encryption method of DCT transform coefficients by the stream algorithms. The simulation results of MAT-LAB software show that this method is suitable for multimedia security in terms of both security and execution speed of the algorithm.

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Section: The Peak Signal To Noise Ratio Of the Encrypted Framesmentioning

confidence: 99%

“…For this purpose, fast and lightweight encryption algorithms are used in frequency conversion. Discrete cosine transform (DCT) and wavelet transform are usually used for multimedia data including video [6][7][8]. The most necessary and important information is available only in some of the initial coefficients in DCT transform [9].…”

Section: Introductionmentioning

confidence: 99%

Encryption of Video Main Frames in the Field of DCT Transform Using A5/1 and W7 Stream Encryption Algorithms

Bahrami

Naderi

2014

Arab J Sci Eng

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“…With the advancement of the computing technology, the holographic encryption process can be conducted with numerical means or a combination of numerical and optical means, which are more flexible and easier to implement than the classical optical methods. Along this direction, successful attempts have been made and published on the digital holographic processing techniques for information security [9][10][11][12][13]. Despite the success achieved to date on digital holography encryption, there are a number of problems which have become identified as areas of investigation in recent years.…”

Section: Introductionmentioning

confidence: 99%

Fast numerical generation and encryption of computer-generated Fresnel holograms

2010

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In the past two decades, generation and encryption of holographic images have been identified as two important areas of investigation in digital holography. The integration of these two technologies has enabled images to be encrypted with more dimensions of freedom on top of simply employing the encryption keys. Despite the moderate success attained to date, and the rapid advancement of computing technology in recent years, the heavy computation load involved in these two processes remains a major bottleneck in the evolution of the digital holography technology. To alleviate this problem, we have proposed a fast and economical solution which is capable of generating, and at the same time encrypting, holograms with numerical means. In our method, the hologram formation mechanism is decomposed into a pair of onedimensional (1D) processes. In the first stage, a given three-dimensional (3D) scene is partitioned into a stack of uniformed spaced horizontal planes and converted into a set of hologram sublines. Next, the sublines are expanded to a hologram by convolving it with a 1D reference signal. To encrypt the hologram, the reference signal is first convolved with a key function in the form of a maximum length sequence (also known as MLS, or M-sequence). The use of a MLS has two advantages. First, an MLS is spectrally flat so that it will not jeopardize the frequency spectrum of the hologram. Second, the autocorrelation function of an MLS is close to a train of Kronecker delta function. As a result, the encrypted hologram can be decoded by correlating it with the same key that is adopted in the encoding process. Experimental results reveal that the proposed method can be applied to generate and encrypt holograms with a small number of computations. In addition, the encrypted hologram can be decoded and reconstructed to the original 3D scene with good fidelity.

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“…여기에는 디지털 홀로그램의 획득/생 성, 홀로그램 영상 디스플레이뿐만 아니라 디지털 홀로그 램 데이터의 압축 [5] , 정보보호 [6] , 정보보안 [7] , 심지어는 디 지털 홀로그램 데이터를 서비스하기 위한 시스템 [8] 까지 포함되고 있다. 특히 [9] [10][11][12] .…”

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Arbitrary Viewpoint/Disparity Stereoscopic Image Generation from a Digital Hologram

Lee¹,

Choi²,

Kim

et al. 2014

Journal of Broadcast Engineering

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This paper proposes a method to generate a stereoscopic image pair from a digital hologram by considering the situation that digital hologram data is serviced but the end-user does not have the proper display equipment, etc. We use Fresnel transform as the method to convert a digital hologram into an image. Each image of the stereoscopic image pair uses a part of the given digital hologram and the sizes of the two partial digital holograms for the two images are chosen to be the same. Here, the size of the image is adjusted by the size of the partial digital hologram and the disparity between the pair images is adjusted by the distance between the centers of the two partial hologram. This paper also deals with how to adjust the size and the disparity of the images. In this paper the generated stereoscopic images are implemented as an anaglyphic display type to confirm the feeling of distance by wearing the red-blue glasses.

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Digital hologram encryption using discrete wavelet packet transform

Cited by 17 publications

References 12 publications

Encryption of Video Main Frames in the Field of DCT Transform Using A5/1 and W7 Stream Encryption Algorithms

Encryption of Video Main Frames in the Field of DCT Transform Using A5/1 and W7 Stream Encryption Algorithms

Fast numerical generation and encryption of computer-generated Fresnel holograms

Arbitrary Viewpoint/Disparity Stereoscopic Image Generation from a Digital Hologram

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