講演・口頭発表等 - 野村　孝徳

Multiwavelengths holgoraphic image fusion using 2D discrete wavelet transform

Proc. Soc. Photo-Opt. Instrum. Eng.  2005年  

Hybrid optical encryption of a three-dimensional object

Optics in Information Systems (SPIE Int. Technical Group Newsletter)  2005年  

Optical encryption based on the input phase mask designed for the space bandwidth of the optical system

Takanori Nomura, Bahram Javidi

Proceedings of SPIE - The International Society for Optical Engineering  2005年  

　概要を見る

To improve the image quality of the decrypted image through the double-random phase-encoding optical encryption, the design method of the input phase mask is proposed. The input phase mask is iteratively designed so that the extent of the Fourier spectrum of the product of an input image and the input phase mask matches to the space bandwidth of the optical system. By using the designed input phase mask, we show that the bit-error rate is improved. We also discuss the number of the phase levels of the designed input phase mask.

Quasi one-shot phase-shifting digital holography

Takanori Nomura, Shinji Murata, Eiji Nitanai, Takuhisa Numata

Proceedings of SPIE - The International Society for Optical Engineering  2005年  

　概要を見る

The quasi one-shot phase-shifting digital holography using phase difference of orthogonal polarizations is proposed. The use of orthogonal polarizations can make it possible to record two phase-shifted holograms simultaneously. By combining the holograms with distributions of a reference wave and an object wave, the complex field of the wavefront of a 3D object can be obtained. As two phase-shifted holograms can be obtained simultaneously in the proposed method, even a moving object can be recorded.