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
Piperazinedione compounds
Silicon carbide substrate, epitaxial wafer and manufacturing method of silicon carbide substrate
Method and system for associating a cell-sector with time-dependent location parameters
Electronic multiparty accounts receivable and accounts payable system
Nickel-cobalt-manganese multi-element lithium ion battery cathode material with dopants and its methods of preparation
Accessory sleeve
  Randomly Featured Patents
Semiconductor processing system for processing discrete pieces of substrate to form electronic devices
Pipe connection for heat exchangers
Quinonoid intermediates from chloroprene
Exhaust gas recirculation system
Fluid-release mold and the method of manufacturing the same
Hybrid Tea rose plant named `Meikatana`
Hydrostatic vehicle control
Truck with driver cab
Bedside video communication system
Vertical tube structure for bicycles