A method for determining physiological parameters associated with a subject using a hand held device (100) is described herein. In an implementation, the method includes capturing a video of a body part (126) of the subject from a camera (128) of the hand held device (100). From the video, a plurality of windows is obtained, each of the windows having a predetermined number of frames. Further, at least one quantized colour value is determined for one or more colour models, for each frame in the plurality of windows. Based on the at least one quantized colour value of each frame, consistency of the video is determined by performing a consistency analysis for a predetermined number of determinant windows from the plurality of windows. In response to the determination of consistency, at least one physiological parameter for the subject is ascertained.
