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• W2004355006 abstract "The complex Fresnel field that contains three-dimensional (3-D) information about an object can be retrieved from an optically generated and electronically detected single off-axis Fresnel hologram of a 3-D object. The retrieved complex Fresnel field gives the appearance of a noise-like distribution. This is primarily due to the scattering nature of the object and the resulting speckle noise, which is a salient trait of the reconstruction process of a hologram. We describe a possible method for securing holographic information by digital encoding of the Fresnel field. A single random-phase Fourier plane encoding is carried out with an assumption that the noisy nature of the complex field may be equivalent to the primary random mask-bonded field, as in the case of conventional double random-phase Fourier plane encoding. The analogy between the decryption process and the numerical reconstruction of the hologram leads to a single-step reconstruction of the complex object field from the encrypted Fresnel field, thus saving computational power. The use of a single off-axis hologram is helpful in zero-order and twin-image free reconstruction. The algorithm is explained with experimental results to support the proof of the concept." @default.
• W2004355006 created "2016-06-24" @default.
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• W2004355006 date "2007-04-01" @default.
• W2004355006 modified "2023-09-30" @default.
• W2004355006 title "Digital Fresnel field encryption for three-dimensional information security" @default.
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• W2004355006 doi "https://doi.org/10.1117/1.2727377" @default.
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