We made the complex hologram of a three-dimensional image using the modified triangular interferometer, and presented and analyzed the three-dimensional images numerically reconstructed from it.
We synthesized and analyzed the optical transfer function (OTF) of the modified triangular interferometer (MTI) using two-pupil synthesis method. In the case of MTI, we demonstrated that we can obtain bipolar functions and complex hologram without bias by two-pupil synthesis method.
KEYWORDS: Digital watermarking, Holography, Image restoration, Holograms, Image compression, Digital holography, Image quality, Binary data, 3D image reconstruction, Transform theory
We propose a new watermarking scheme that can be used to embed multiple bits and also resilient to JPEG compression and geometrical transforms such as scaling, rotation, and cropping, based on holographic watermark that allows multiple watermark recovery without original content (cover image). The holographic watermark is that Fourier transformed digital hologram, embedded into cover image in the spatial domain. The proposed method has not only increased robustness with a stronger embedding but also imperceptibility of the watermark in the evaluation process. To compare with the conventional scheme, the spread spectrum, we embedded and recovered maximum 1,024 bits that consist of binary number over PSNR (peak signal-to-noise ratio) 39dB. And also, we computed robustness with BER (bit-error rate) corresponding the above attacks.
We proposed a new spatio-angularly multiplexed holographic memory system using moving windows and double-focusing lens, which can eliminate crosstalk due to two neighboring moving windows in the vertical direction of the conventional moving window holographic memory system, and demonstrated its feasibility through optical experiments.
By controlling the pixels of a liquid crystal display (LCD) electronically, we fabricated a real-time moving window on a LCD, through which light passes. Using the moving window and multi-focusing lens, we suggested a non-mechanical spatio- angular multiplexed holographic memory system and demonstrated its feasibility through optical experiments. The principle of the proposed method and optical experimental results are also presented.
We present a new holographic display system that reconstructs the complex hologram (which is free from the bias and the conjugate image) obtained from the modified triangular interferometer. This system is based on the Mach- Zehnder interferometer with modification of inserting liquid crystal displays (LCDs) and a wave plate. The information of the real and imaginary parts of the complex hologram are transferred to LCDs and the lights passed through LCDs are recombined by a beam splitter. By Fresnel diffraction, the desired image is reconstructed. We demonstrated through theoretical analysis and experiments that the image reconstruction from the complex hologram is possible using the proposed system.
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