1. A method of determining a video signal's noise level, the video signal comprising a series of frames, the method comprising: receiving a first video signal portion, the first video signal portion comprising a plurality of pixels corresponding to a first frame; comparing a first set of the plurality of pixels corresponding to the first frame with a second set of the plurality of pixels corresponding to the first frame; using the comparison in determining a noise level of the video signal portion; and if the determined noise level is below a first threshold, then improving a second video signal portion's sharpness, the second video signal portion corresponding to a second frame, the second frame subsequent to the first frame.