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Low light level color image television system including electronic contrast enhancement system

  • US 5,051,821 A
  • Filed: 02/26/1991
  • Issued: 09/24/1991
  • Est. Priority Date: 06/24/1988
  • Status: Expired due to Fees
First Claim
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1. A low light level television system having a first channel which detects the nocturnal light reflected by objects in the visible spectrum and in the near infrared (400 nm to approximately 1000 nm) and a second channel which detects another part of the spectrum, each channel including a low light level picture pick-up or detector tube and an input lens adapted to the range of the detected wavelength, the sensitivity range of the first channel being determined by the sensitivity of the photocathode of the detector tube, the signals of the two channels being combined to produce an image on a television monitor, characterized in that the second channel also detects the light reflected from the objects in a wavelength range formed by the visible part (400 nm to approximately 700 nm) of the spectrum of the first channel, this sensitivity range of the second channel included in the sensitivity range of the first channel rendering it possible to improve the contrast and the noise of the image, the two tubes being positioned side-by-side so as to have the two images coincide and being provided with two electronic control and synchronous output circuits, the monitor being a colour television monitor, the first and second channels each acting on one of the colour input channels of the monitor to recover their information components via different combined colours in accordance with a single coloured image.

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