An input device includes a plurality of sensor electrodes and a processing system. The plurality of sensor electrodes is configured for capacitive sensing in a sensing region of the input device. The processing system is configured to receive first sensor information about the sensing region from the plurality of sensor electrodes, and to receive second sensor information about the sensing region from an auxiliary sensing device coupled to the sensing region. The processing system is further configured to dynamically calibrate the plurality of sensor electrodes based at least in part on the first sensor information and the second sensor information. In some aspects, the auxiliary sensing device may comprise one or more optical sensors.