AN ELECTRO-OPTICAL DETECTION SYSTEM FOR REFLECTION FREE UNDERWATER IMAGES FROM AIRCRAFT

摘要

electro optical system for detection of objects (12) embedded in a partially transmissif.it includes a sensor device (20) of electromagnetic radiation in two spectral channels (28) spaced), a signalling channel (212) in which the wavelength and the bandwidth is optimized to match the peak of transmission the middle.a reference track (28) in which the wavelength and bandwidth are selected so as to correspond to a wavelength region in which the attenuation in the medium is high. second, we subtract (213) signalling pathways and reference, etc. (e) to remove from the signalling channel (212), the effects of the reflected radiation.there is a digital signal processing (218) to obtain an enhanced image of the visual field.in a system for detection of underwater objects, using a television camera charge coupled detector (20) having three separate networks charge coupled sensor providing output signals of red (r), green (g) and the blue (b).according to a report by the associated adjustable red and blue color signals so as to obtain an image signal, adapted to the conditions in the sea in transmissive. a band stop filter is used to eliminate the narrow band light in a spectral band of the signal channels and reference.