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
Electrowetting display devices with a reflective plate structure
Pyrrolidine-1,2-dicarboxamide derivatives
Translucent internal graphics enhancement
Color image forming apparatus with contact control of process units
Device for installing conducting components in structures
Pluggable power cell for an inverter
  Randomly Featured Patents
Construction of illuminating ribbon of light bulbs
Method and apparatus for analysis of relative levels of biodiesel in fuels by near-infrared spectroscopy
Apparatus for prolonging rechargeable battery life and power in a wireless communicating hand-held system
Semi-crystalline, semi-aromatic terpolymers with superior post-molding shrinkage and balance of mechanical performance
System and method for mailing services including notification to recipient of items requiring time sensitive actions
Article exhibiting enhanced adhesion between a dielectric substrate and heat spreader and method
Motor controller having automatic permanent single phase wiring detection
Method for scheduling packetized data traffic
Portable draft bar