According to an aspect there is provided an apparatus for identifying living skin tissue in a video sequence the apparatus comprising a processing unit configured to obtain a video sequence the video sequence comprising a plurality of image frames divide each of the image frames into a first plurality of frame segments form a first plurality of video sub sequences each video sub sequence comprising a frame segment from the first plurality of frame segments for two or more of the image frames divide each of the image frames into a second plurality of frame segments the second plurality of frame segments comprising a greater number of frame segments than the first plurality of frame segments form a second plurality of video sub sequences each video sub sequence comprising a frame segment from the second plurality of frame segments for two or more of the image frames analyze the video sub sequences in the first plurality of video sub sequences and the second plurality of video sub sequences to determine a pulse signal for each video sub sequence and analyze the pulse signals to identify areas of living skin tissue in the video sequence.
