A system for capturing one or more sensor images of an object , the system comprising: a touch system including a touch-sensitive screen and a display ; wherein the touch system is configured to detect the object when the object is within a proximity to the touch-sensitive screen , and to derive one or more parameters based on an interaction with the object ; and a fingerprint sensor system including a ultrasonic sensor array and a processing component , wherein the ultrasonic sensor array is coupled to the touch-sensitive screen , wherein the ultrasonic sensor array includes a set of transmitters configured to transmit ultrasonic signals and a set of receivers configured to receive ultrasonic signals and wherein at least a portion of the sensor array overlaps with at least a portion of the touch-sensitive screen ; and wherein the processing component is configured to determine, based on the one or more parameters, whether to capture one or more images of the object via the ultrasonic sensor array and to determine, based on the one or more parameters, optimal sensor operating parameters and to adjust the sensor operating parameters, and in response to a determination, derived by the touch system , to capture one or more images of the object , the processing component is configured to activate the set of transmitters to transmit an ultrasonic signal and is further configured to capture, based on the ultrasonic signal reflected from the object the one or more images of the object , wherein the object is a finger , and wherein the touch system includes capacitive electrodes that are configured to detect liveness of the finger by measuring the capacitance against time, and wherein the capacitive electrodes are segmented on an upper layer of the ultrasonic sensor array . a touch system including a touch-sensitive screen and a display ; wherein the touch system is configured to detect the object when the object is within a proximity to the touch-sensitive screen , and to derive one or more parameters based on an interaction with the object ; and a fingerprint sensor system including a ultrasonic sensor array and a processing component , wherein the ultrasonic sensor array is coupled to the touch-sensitive screen , wherein the ultrasonic sensor array includes a set of transmitters configured to transmit ultrasonic signals and a set of receivers configured to receive ultrasonic signals and wherein at least a portion of the sensor array overlaps with at least a portion of the touch-sensitive screen ; and wherein the processing component is configured to determine, based on the one or more parameters, whether to capture one or more images of the object via the ultrasonic sensor array and to determine, based on the one or more parameters, optimal sensor operating parameters and to adjust the sensor operating parameters, and in response to a determination, derived by the touch system , to capture one or more images of the object , the processing component is configured to activate the set of transmitters to transmit an ultrasonic signal and is further configured to capture, based on the ultrasonic signal reflected from the object the one or more images of the object , wherein the object is a finger , and wherein the touch system includes capacitive electrodes that are configured to detect liveness of the finger by measuring the capacitance against time, and wherein the capacitive electrodes are segmented on an upper layer of the ultrasonic sensor array . <EOS>