A three-dimensional image, 3DI, system comprising: a modulator configured to generate a first modulation signal having a first modulation frequency and a second modulation signal having a second modulation frequency; an illumination source configured to generate a modulated light signal based on the first modulation signal; a sensor core including a pixel array modulated by the second modulation signal, wherein at least one pixel of the pixel array is configured to receive the modulated light signal reflected from an object as a reflected modulated light signal and to demodulate the reflected modulated light signal using the second modulation signal during an image acquisition to generate a measurement signal, wherein the at least one pixel is configured to generate a plurality of measurement signals based on a plurality of image acquisitions taken at different acquisition times; and a control unit including at least one processor, the control unit configured to: control a phase difference between the first modulation signal and the second modulation signal by setting the first modulation frequency and the second modulation frequency to have a predetermined frequency difference greater than zero; control the sensor core to initiate the plurality of image acquisitions at the different acquisition times; receive the plurality of measurement signals, and calculate a depth of the object based on the plurality of measurement signals, wherein the depth is a distance from the 3DI system to the object. a modulator configured to generate a first modulation signal having a first modulation frequency and a second modulation signal having a second modulation frequency; an illumination source configured to generate a modulated light signal based on the first modulation signal; a sensor core including a pixel array modulated by the second modulation signal, wherein at least one pixel of the pixel array is configured to receive the modulated light signal reflected from an object as a reflected modulated light signal and to demodulate the reflected modulated light signal using the second modulation signal during an image acquisition to generate a measurement signal, wherein the at least one pixel is configured to generate a plurality of measurement signals based on a plurality of image acquisitions taken at different acquisition times; and a control unit including at least one processor, the control unit configured to: control a phase difference between the first modulation signal and the second modulation signal by setting the first modulation frequency and the second modulation frequency to have a predetermined frequency difference greater than zero; control the sensor core to initiate the plurality of image acquisitions at the different acquisition times; receive the plurality of measurement signals, and calculate a depth of the object based on the plurality of measurement signals, wherein the depth is a distance from the 3DI system to the object. control a phase difference between the first modulation signal and the second modulation signal by setting the first modulation frequency and the second modulation frequency to have a predetermined frequency difference greater than zero; control the sensor core to initiate the plurality of image acquisitions at the different acquisition times; receive the plurality of measurement signals, and calculate a depth of the object based on the plurality of measurement signals, wherein the depth is a distance from the 3DI system to the object. <EOS>