1. An image acquisition system, comprising: a single set of focussing optics focussing an incident beam coming from a scene to be imaged on a first sensor and a second sensor exhibiting identical spectral response curves, followed by separation means separating the irradiance of the beam coming from the focussing optics into a first and a second predetermined fraction, the separation means furthermore orienting the first fraction of the beam irradiance coming from the focussing optics towards the first sensor and the second fraction of the light beam coming from the focussing optics towards the second sensor, control means for controlling a first acquisition or integration time of the scene to be imaged by the first sensor so as to obtain a first image and/or a second acquisition or integration time of the scene to be imaged by the second sensor so as to obtain a second image, and merging means that merge the first image coming from the first sensor and the second image coming from the second sensor so as to generate a final image, the control means controlling the integration time of the first sensor and of the second sensor as a function of the histogram only of the image from the sensor having the shortest integration time between the first sensor and the second sensor.