An image sensor comprising a plurality of pixels distributed in a plurality of elementary groups of a plurality of pixels each, wherein: each pixel comprises a photoelectric conversion element and an individual capacitive storage element; and each elementary group of pixels comprises a shared capacitive storage element, the sensor further comprising a control circuit capable, during a current image acquisition phase, of implementing, in each elementary group of pixels, the steps of: a) during a first integration sub-period, coupling the photoelectric conversion elements of the pixels of the group to the shared capacitive storage element, to integrate a current representative of the sum of the photo-currents generated by the photoelectric conversion elements of the pixels of the group, and coupling the individual capacitive storage elements of the pixels of the group to the shared capacitive storage element to distribute the photogenerated charges between the shared capacitive storage element and the individual capacitive storage elements; and b) during a second integration sub-period following the first integration sub-period, in each pixel of the group, isolating the individual capacitive storage element of the pixel from the shared capacitive storage element and coupling the photoelectric conversion element of the pixel to the individual capacitive storage element of the pixel to integrate in the individual capacitive storage element of the pixel a current representative of the photocurrent generated by the photoelectric conversion element of the pixel. each pixel comprises a photoelectric conversion element and an individual capacitive storage element; and each elementary group of pixels comprises a shared capacitive storage element, the sensor further comprising a control circuit capable, during a current image acquisition phase, of implementing, in each elementary group of pixels, the steps of: a) during a first integration sub-period, coupling the photoelectric conversion elements of the pixels of the group to the shared capacitive storage element, to integrate a current representative of the sum of the photo-currents generated by the photoelectric conversion elements of the pixels of the group, and coupling the individual capacitive storage elements of the pixels of the group to the shared capacitive storage element to distribute the photogenerated charges between the shared capacitive storage element and the individual capacitive storage elements; and b) during a second integration sub-period following the first integration sub-period, in each pixel of the group, isolating the individual capacitive storage element of the pixel from the shared capacitive storage element and coupling the photoelectric conversion element of the pixel to the individual capacitive storage element of the pixel to integrate in the individual capacitive storage element of the pixel a current representative of the photocurrent generated by the photoelectric conversion element of the pixel. a) during a first integration sub-period, coupling the photoelectric conversion elements of the pixels of the group to the shared capacitive storage element, to integrate a current representative of the sum of the photo-currents generated by the photoelectric conversion elements of the pixels of the group, and coupling the individual capacitive storage elements of the pixels of the group to the shared capacitive storage element to distribute the photogenerated charges between the shared capacitive storage element and the individual capacitive storage elements; and b) during a second integration sub-period following the first integration sub-period, in each pixel of the group, isolating the individual capacitive storage element of the pixel from the shared capacitive storage element and coupling the photoelectric conversion element of the pixel to the individual capacitive storage element of the pixel to integrate in the individual capacitive storage element of the pixel a current representative of the photocurrent generated by the photoelectric conversion element of the pixel.