The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 04, 2001
Filed:
May. 25, 2000
Katsunori Kawano, Nakai-machi, JP;
Jiro Minabe, Nakai-machi, JP;
Takehiro Niitsu, Nakai-machi, JP;
Tsutomu Ishii, Nakai-machi, JP;
Yasunari Nishikata, Nakai-machi, JP;
Kazuo Baba, Nakai-machi, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
A method and an apparatus capable of filtering based on desired spatial frequency characteristics without loss of Fourier spectrum frequency components, and of matched filtering of high recognition capability without losing functions of data recording and reconstruction as well as high-speed transmission and retrieval features and mass storage capacity characteristic of a holographic memory. Fourier transformed object light with 0° polarization of a target image is stored as a hologram using reference light having a spatial polarization distribution such that a daughter wavelet on scale m has 90° polarization. The hologram is retrieved using the Fourier transformed object light with 0° polarization. The hologram yields diffracted light in the form of a spatial frequency component which corresponds to scale m and is polarized 90° with respect to the other spatial frequency components. A polarizing element is used to extract only the spatial frequency component corresponding to scale m. Given reference light having a spatial polarization distribution in conformity with a shape of a spatial frequency filter, retrieval light of 0° polarization is applied for low-pass and high-pass filtering upon reconstruction.