Real-time image difference detection using a polarization rotati

Details Real-time image difference detection using a polarization rotati Real-time image difference detection using a polarization rotati

1988-04-29

1990-03-13

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358106, 382 31, 340716, 350337, 350347E, 353 20, H04N 718

Patent

active

049087029

ABSTRACT:
An image difference detection system is described, of the type wherein two created image representations such as transparencies representing the images to be compared lie coplanar, while light passes through the two transparencies and is formed into coincident images at the image plane for comparison. The two transparencies are formed by portions of a polarization rotation spacial light modulator display such as a multi-pixel liquid crystal display or a magneto optical rotation type. In a system where light passing through the two transparencies is polarized in transverse directions to enable the use of a Wollaston prism to bring the images into coincidence, a liquid crystal display can be used which is devoid of polarizing sheets that would interfere with transverse polarizing of the light passing through the two transparencies.

REFERENCES:
patent: 3389056 (1975-06-01), Mayer, Jr. et al.
patent: 3787117 (1974-01-01), Watkins
patent: 4330712 (1982-05-01), Yoshida
patent: 4458993 (1984-07-01), Kempf
patent: 4476465 (1984-10-01), Anderson
patent: 4513441 (1985-04-01), Henshaw
patent: 4542404 (1985-09-01), Duschl
patent: 4612666 (1986-09-01), King
patent: 4637056 (1987-01-01), Sherman et al.
patent: 4648053 (1987-03-01), Fridge
patent: 4653867 (1987-03-01), Urabe et al.
patent: 4663670 (1987-05-01), Ito et al.
patent: 4680627 (1987-07-01), Sase et al.
patent: 4692943 (1987-09-01), Pietzsch et al.
patent: 4770500 (1988-09-01), Kalmanash et al.
patent: 4772101 (1988-09-01), Liu
"Real-Time Optical Interferometric Image Subtraction by Wave Polarization", Zhao et al; Applied Optics, vol. 4, #21, Nov. '82.
"Application of Inexpensive LC TV to Optical Parallel Logic"; SPIE vol. 825, Spatial Light Modulators and Applications; Yu et al; 1987; pp. 163-168.
"Real-Time LC TV XOR and XNOR-Gate Binary Image Subtraction Technique", Applied Optics, vol. 26, #14, Jul. '87, Yu et al.

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