Noise adjusted recursive filter

Details Noise adjusted recursive filter Noise adjusted recursive filter

H - Electricity

04

N

350/48, 350/81

H04N 5/217 (2006.01) H04N 5/21 (2006.01)

Patent

CA 1248626

Abstract A noise adjusted recursive filtering apparatus is presented for use in processing video signals having picture portions and predetermined nonpicture portions. A noise detector responds to video signals during a nonpicture portion for providing a noise signal having a magnitude representative of the average noise level on the video signal. A recursive filter is provided for filtering the video signal and this filter includes a delay for delaying the input video signal together with circuitry for determining the difference between a present input video signal and a delayed video signal. The difference signal as well as the noise level signal are employed for purposes of providing a correction signal which is added to the input signal to provide an output video signal. The correction signal is a nonlinearly related percentage of the difference signal and varies as a function of the difference signal and the noise level signal.

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