H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/48, 350/81
H04N 5/21 (2006.01)
Patent
CA 1126860
ABSTRACT OF THE DISCLOSURE A recursive noise reduction system for a television system uses the spatial corelation in a frame difference signal derived by element-by-element subtraction of an incoming video signal from corresponding picture elements of a relatively noise-free stored video signal to reduce noise in a video signal. The spatial corelation is used to suppress the com- ponents of the frame difference signal which are due to frame-to-frame changes in the video resulting from motion in the scene, thus producing a signal which contains sub- stantially only the noise in the incoming video. The noise signal thus derived is subtracted from the incoming video signal to produce a noise-reduced output signal for display or recording. The noise-reduced output signal and the incoming video are added together in varying proportions according to the amount of scene-to-scene motion detected and the sum is stored for use in subsequent treatment of new incoming video.
336033
Gowling Lafleur Henderson Llp
Sony Corporation
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