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Nonlinear temporal filter for television picture noise reduction

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1 Author(s)
Dennis, T.J. ; University of Essex, Department of Electrical Engineering Science, Colchester, UK

A conventional recursive interframe lowpass filter for 625 line 5.5 MHz monochrome television is modified so that its attenuation of frame differences is instantaneously dependent on their amplitude. This results in improved rendition of motion when compared with the original design. Performance is assessed by objective measurement of noise attenuation for a range of input noise levels and nonlinear characteristics, and by subjective opinion tests on pictures containing noise and movement.

Published in:

Electronic Circuits and Systems, IEE Proceedings G  (Volume:127 ,  Issue: 2 )

Date of Publication:

April 1980

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