Resources Contact Us Home
Electro-optical detection system for reflection free underwater images from aircraft

Image Number 2 for United States Patent #5444441.

An electro-optical detection system for detecting objects 12 embedded within a partially transmitting medium comprises means 20 to receive electro-magnetic radiation in two close spectral channels 28, 212: a signal channel 212 where the wavelength and bandwidth of the signal channel are optimized to correspond to the peak of transmission of the medium and a reference channel 28 where the wavelength and bandwidth are selected to correspond to a spectral region where attenuation in the medium is high. The signal and reference channels are then subtracted (213) so as to remove the effect of reflected radiation from the signal channel 212. The signal is processed digitally (218) to provide an enhanced image of the field of view. In a particular arrangement for detecting objects underwater a CCD TV camera 20 is used with three separate CCD detector arrays providing concurrent red (R), green (G), blue (B) output signals. The green and blue signals are combined in an adjustable ratio to provide the image signal to match the prevailing conditions of the partially transmitting sea. A notch filter is employed to cut out light in a spectral band between the signal and reference channels.

  Recently Added Patents
Single mode optical fiber with improved bend performance
Data management tool
Respirator belt having bumper cushion
Charging member, electrophotographic apparatus, and process cartridge
Wide bandwidth hybrid antenna for combination EAS and RFID label or tag
Architectural panel with natural fossil spade leaf embossed surface
Scanned image projection system employing intermediate image plane
  Randomly Featured Patents
Promoted porous catalyst
Apparatuses, methods, and systems for thermal management of hybrid vehicle SCR aftertreatment
Remote split scan detector
Water-dilutable coating
System and method for aligning a laser transmitter
Device and method of controlling flash memory
Display device for shifting location of pixels and method thereof
Automatic recovery of a corrupted boot image in a data processing system
Color detection and/or recognition apparatus
Hybrid locating method and system for locating a mobile terminal in a wireless communications network