A computer-implemented method comprising: receiving data corresponding to an ambient-corrected image of a subject illuminated by an illumination unit providing temporally modulated illumination with a modulation frequency that is higher than a frame acquisition rate used by an imaging device to obtain a set of images having a different spatial intensity modulation pattern in each image due to the temporally modulated illumination and the imaging device operating in a rolling shutter mode, wherein the ambient-corrected image is determined based on the different spatial intensity modulation pattern in each image of the obtained set of images, and wherein pixel intensity information from each image of the obtained set of images is used to construct the ambient-corrected image by determining, from the pixel intensity information of each image of the obtained set of images, pixel intensity registered due to ambient lighting and the pixel intensity registered due to the temporally modulated illumination in each image of the obtained set of images and constructing the ambient-corrected image from the pixel intensity information of each image of the obtained set of images based on the pixel intensity registered due to the temporally modulated illumination in each image of the obtained set of images; determining a signal-to-noise ratio, SNR, of at least a portion of the ambient-corrected image; and in response to determining that the SNR is below a target SNR, causing an indication of an illumination parameter to be sent to the illumination unit to increase an amplitude modulation depth of the temporally modulated illumination used to illuminate the subject while the imaging device acquires a subsequent set of images for constructing a subsequent ambient-corrected image with increased SNR for at least a portion of the subsequent ambient-corrected image. receiving data corresponding to an ambient-corrected image of a subject illuminated by an illumination unit providing temporally modulated illumination with a modulation frequency that is higher than a frame acquisition rate used by an imaging device to obtain a set of images having a different spatial intensity modulation pattern in each image due to the temporally modulated illumination and the imaging device operating in a rolling shutter mode, wherein the ambient-corrected image is determined based on the different spatial intensity modulation pattern in each image of the obtained set of images, and wherein pixel intensity information from each image of the obtained set of images is used to construct the ambient-corrected image by determining, from the pixel intensity information of each image of the obtained set of images, pixel intensity registered due to ambient lighting and the pixel intensity registered due to the temporally modulated illumination in each image of the obtained set of images and constructing the ambient-corrected image from the pixel intensity information of each image of the obtained set of images based on the pixel intensity registered due to the temporally modulated illumination in each image of the obtained set of images; determining a signal-to-noise ratio, SNR, of at least a portion of the ambient-corrected image; and in response to determining that the SNR is below a target SNR, causing an indication of an illumination parameter to be sent to the illumination unit to increase an amplitude modulation depth of the temporally modulated illumination used to illuminate the subject while the imaging device acquires a subsequent set of images for constructing a subsequent ambient-corrected image with increased SNR for at least a portion of the subsequent ambient-corrected image. <EOS>