A physiological parameter measurement device (100) comprising a processor (102) and a video processing module (110) coupled to the processor (102) to divide each of a plurality of frames of a video into a plurality of blocks, where the video is of a body part of a subject whose physiological parameter is to be determined. The video processing module (110) further is to select a block having highest peak signal to noise ratio (PSNR) from amongst the plurality of blocks. Further, the video processing module (110) is to extract a photoplethysmogram (PPG) signal from the video based on a block identifier associated with the block. The physiological parameter measurement device (100) further comprises a signal enhancement module (112) coupled to the processor (102), to process the PPG signal to obtain an enhanced PPG signal for determining a value of the physiological parameter for the subject.
