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Optical encryption for large-sized images using random phase-free method
Tomoyoshi Shimobaba,Takashi Kakue,Yutaka Endo,Ryuji Hirayama,Daisuke Hiyama,Satoki Hasegawa,Yuki Nagahama,Marie Sano,Takashige Sugie,Tomoyoshi Ito +9 more
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An optical encryption framework that can encrypt and decrypt large-sized images beyond the size of the encrypted image using the random phase-free method and scaled diffraction is proposed.Abstract:
We propose an optical encryption framework that can encrypt and decrypt large-sized images beyond the size of the encrypted image using our two methods: random phase-free method and scaled diffraction. In order to record the entire image information on the encrypted image, the large-sized images require the random phase to widely diffuse the object light over the encrypted image; however, the random phase gives rise to the speckle noise on the decrypted images, and it may be difficult to recognize the decrypted images. In order to reduce the speckle noise, we apply our random phase-free method to the framework. In addition, we employ scaled diffraction that calculates light propagation between planes with different sizes by changing the sampling rates.read more
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Improvement of the image quality of random phase--free holography using an iterative method
Tomoyoshi Shimobaba,Takashi Kakue,Yutaka Endo,Ryuji Hirayama,Daisuke Hiyama,Satoki Hasegawa,Yuki Nagahama,Marie Sano,Minoru Oikawa,Takashige Sugie,Tomoyoshi Ito +10 more
TL;DR: In this article, an iterative random phase-free method with virtual convergence light was proposed to obtain large reconstructed images exceeding the size of the hologram, without the assistance of random phase.
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Journal ArticleDOI
Optical image encryption based on input plane and Fourier plane random encoding.
Philippe Réfrégier,Bahram Javidi +1 more
TL;DR: A new optical encoding method of images for security applications is proposed and it is shown that the encoding converts the input signal to stationary white noise and that the reconstruction method is robust.
Journal ArticleDOI
Double random-phase encoding in the Fresnel domain
Guohai Situ,Jingjuan Zhang +1 more
TL;DR: A lensless optical security system based on double random-phase encoding in the Fresnel domain is proposed, which can encrypt a primary image to random noise by use of two statistically independent random- phase masks in the input and transform planes, respectively.
Journal ArticleDOI
Encrypted optical memory system using three-dimensional keys in the Fresnel domain.
Osamu Matoba,Bahram Javidi +1 more
TL;DR: Encryption and decryption of optical memory in a LiNbO(3) :Fe photorefractive crystal by use of angular multiplexing is demonstrated.
Journal ArticleDOI
Securing information by use of digital holography.
Bahram Javidi,Takanori Nomura +1 more
TL;DR: An information security method that uses a digital holographic technique that provides secure storage and data transmission and can be electrically decrypted by use of the digital hologram of the key.
Journal ArticleDOI
Optical image compression and encryption methods
Ayman Alfalou,Christian Brosseau +1 more
TL;DR: Optical processing methodologies, based on filtering, are described that are applicable to transmission and/or data storage and the advantages and limitations of a set of optical compression and encryption methods are discussed.