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
Focus adjustment unit and optical scanning microscope
Multistable electromagnetic actuators
Headset electronics
Device and method for quantizing and inverse quantizing LPC filters in a super-frame
Digital broadcasting transmission and reception system, and a signal processing method using turbo processing and turbo decoding
Oscillation circuit
Plastic floor-wall transition methods, materials, and apparatus
  Randomly Featured Patents
Method and apparatus for real-time weld process monitoring in a pulsed laser welding
Aromatic cyanate ester silane coupling agents
Poultry chiller having an integral sump compartment
Seal integrity evaluation method
Magnetic memory unit and magnetic memory array
Timer circuit and semiconductor memory incorporating the timer circuit
Method and system for measuring left ventricle volume
Electronic apparatus
Constant-output atomizer
Configurable field definition document