All optical image processing and pattern recognition apparatus using stimulated photon echoes
July 5, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3638029 3766498 Phase conjugate correction for high gain amplifier systems Information storage system using a photon echo medium Phase conjugate relative position sensor Optically implemented memory correlator using a photorefractive crystal Associative holographic memory apparatus employing phase conjugate mirrors Associative holographic memory apparatus employing phase conjugate mirrors and a two-wave mixing contra-directional coherent image amplifier System and method for encoding information onto an optical beam Optical processing in III-V and II-VI compound semiconductors Patent #: 4948212 InventorsAssigneeApplicationNo. 721459 filed on 07/05/1991US Classes:359/26, Sequential frames on moving film359/299, Opto-optical device359/321, Having particular chemical composition or structure359/561, For correlation365/119, Color centers382/210Spatial filtering (e.g., holography)ExaminersPrimary: Arnold, Bruce Y.Assistant: Parsons, David R. Attorney, Agent or FirmInternational ClassesG02F 001/00G02B 027/46 G06K 009/74 G06E 003/00 AbstractAn image processing apparatus having a third-order nonlinear stimulated photon echo medium (1). The photon echo medium (1) can store large numbers of images in the form of a Fourier transformed pattern by spectral modulation. The spectral modulation is carried out by sending optical pulses in an optical pulse train having (or not having) image information to the medium (1) so that the population in the ground and excited states are modulated after the passage of the pulse trains and pulses. The Fourier transformed pattern is converted back to temporal modulation, consisting of a sequence of echo pulses that reproduce the original data pulse train. By using the apparatus, ultrafast operation such as convolution and correlation between a number of reference images and a test image can be achieved. | |
