An image sensor system that includes a plurality of super-pixels; a condition detector readout; a plurality of latches; an analog-to-digital circuit shared between at least two super-pixels; and each super-pixel comprises: a first photosensitive element; a detector that is electrically connected to the first photosensitive element and configured to generate a trigger signal when an analog signal proportional to brightness of light impinging on the first photosensitive element matches a condition; at least one second photosensitive element; and at least one exposure measurement sub-circuit that is electrically connected to the at least one second photosensitive element and configured to integrate an analog signal proportional to brightness of light impinging on the second photosensitive element onto a node; the system characterised in that the detector of each super-pixel is associated with a latch connected to the analog-to-digital circuit shared between the at least two super-pixels of the image sensor, each latch also being associated with the at least one exposure measurement sub-circuit of each super-pixel; the detector of each super-pixel is further configured to communicate with the condition detector readout to transfer the trigger signal to enable the associated latch of the associated exposure measurement sub-circuit, or the detector of each superpixel is further configured to communicate with the condition detector readout to transfer the trigger signal and the associated latch of the associated exposure measurement sub-circuit is enabled by an external readout trigger; and wherein the exposure measurement sub-circuit of each super-pixel is further configured, in response to at least one periodic control signal, to transfer the integrated signal from the node to the analog-to-digital circuit shared between the at least two super-pixels of the image sensor when the associated latch is enabled. a first photosensitive element; a detector that is electrically connected to the first photosensitive element and configured to generate a trigger signal when an analog signal proportional to brightness of light impinging on the first photosensitive element matches a condition; at least one second photosensitive element; and at least one exposure measurement sub-circuit that is electrically connected to the at least one second photosensitive element and configured to integrate an analog signal proportional to brightness of light impinging on the second photosensitive element onto a node; the system characterised in that the detector of each super-pixel is associated with a latch connected to the analog-to-digital circuit shared between the at least two super-pixels of the image sensor, each latch also being associated with the at least one exposure measurement sub-circuit of each super-pixel; the detector of each super-pixel is further configured to communicate with the condition detector readout to transfer the trigger signal to enable the associated latch of the associated exposure measurement sub-circuit, or the detector of each superpixel is further configured to communicate with the condition detector readout to transfer the trigger signal and the associated latch of the associated exposure measurement sub-circuit is enabled by an external readout trigger; and wherein the exposure measurement sub-circuit of each super-pixel is further configured, in response to at least one periodic control signal, to transfer the integrated signal from the node to the analog-to-digital circuit shared between the at least two super-pixels of the image sensor when the associated latch is enabled.