Procedure and means for producing a false colour picture

Details Procedure and means for producing a false colour picture Procedure and means for producing a false colour picture

H - Electricity

04

N

350/43

H04N 9/04 (2006.01)

Patent

CA 2031742

PROCEDURE AND MEANS FOR PRODUCING A FALSE COLOUR PICTURE ABSTRACT OF DISCLOSURE The invention concerns a procedure and means for forming a wrong colour picture, in said procedure being utilized a video camera comprising advantageously a plurality of semiconductor detectors, such as CCD detectors, having a sensitivity range in respect of wavelength extending into the near infra-red range. The invention is characterized in that before the semicon- ductor detector array (2) of the camera is placed a high-pass filter (4) cutting off blue light so that only near infra-red radiation gas access to the blue light detectors (N'), both near infra-red radiation and green light have access to the green light detectors (G') and both near infra-red radiation and red light have access to the red light detectors (R'=, whereby from the outputs (B,G,R) of the camera (1) or equival- ent are obtained signals (ir,ir+g,ir+r) representing the respective combinations of radiation. From the sig- nal (ir+g) representing the intensity of near infra-red radiation and green light obtained from the camera (1) and from the signal (ir+r) representing the intensity of near infra-red radiation and red light is in a sub- tractor (5) subtracted the signal (ir) representing the intensity of near infra-red radiation, whereupon the output signals indicate, in equivalent order, the in- tensity of green and red light (g,r) and the intensity of near infra-red radiation (ir), whereupon in a swap- per (5) the order of the signals (g,r,ir) is changed in order to obtain the desired combined wrong colour sig- nal. (Fig. 2)

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