• DocumentCode
    3553555
  • Title

    A real time Fourier plane filter

  • Author

    Aldrich, R.E. ; Krol, F.J. ; Simmons, W.A.

  • Author_Institution
    Itek Corporation, Lexington, Mass.
  • Volume
    18
  • fYear
    1972
  • fDate
    1972
  • Firstpage
    112
  • Lastpage
    112
  • Abstract
    An electrically addressed, liquid crystal, fourier plane filter capable of real time optical image processing is described. The filter consists of two parts, a wedge filter having forty 9° segments and a ring filter having twenty concentric rings in a one inch diameter active area. Transmission of the filter in the off (transparent) state exceeds fifty percent. By using polarizing optics, contrast as high as 104:1 can be achieved at voltages compatible with FET switching technology. A phenomenological model for the dynamic scattering will be presented for this special case.
  • Keywords
    High speed optical techniques; Image processing; Light scattering; Liquid crystals; Optical character recognition software; Optical filters; Optical scattering; Optical sensors; Valves; Voltage;
  • fLanguage
    English
  • Publisher
    ieee
  • Conference_Titel
    Electron Devices Meeting, 1972 International
  • Type

    conf

  • DOI
    10.1109/IEDM.1972.249333
  • Filename
    1477156
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=3553555