Observation system and method

An observation system comprising a first optical path capable of receiving a first optical radiation emitted by a scene to be observed and including a first sensor configured to generate a first digital image from the first optical radiation;

• a second optical path capable of receiving a second optical radiation emitted by the scene and including a second sensor configured to generate a second digital image from the second optical radiation;
• a display configured to display a third digital image from the first and second digital images;
• and a third optical path coupled to the display and designed to observe the third digital image;
• wherein it includes a fourth optical path connecting the first and third optical paths, and in that the first optical path includes an optical element configured to transmit a part of the first optical radiation to the fourth optical path.