The Digital Wetgate: A Third-Generation Noise Reducer

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: SMPTE J
Volume: 105, No. 2, pp. 95–100
Abstract: This paper describes the development of noise-reduction technology and addresses its applications. First-generation noise reducers using linear filtering techniques such as recursive or transversal filters were designed for removing film grain noise or tape noise of analog VTRs. With the introduction of nonlinear median filtering techniques it became possible to conceal impulse-type noise such as film dust, randomly dispersed film scratches, or FM sparkles. A third-generation noise reducer now has been developed by BTS. By the use of advanced techniques for error detection and motion adaption it is now possible to conceal large film dirt or fixed vertical film scratches — so-called tramline scratches. A wide range of new features especially designed for film reproduction, such as automatic pulldown and scene-change detection, provide great concealment power in the digital wetgate.
Publication Date: 1996-02-01
DOI: 10.5594/J04670
ISSN: Print: 0036-1682
Link: https://doi.org/10.5594/J04670
Author(s): Gerhard WischermannGerhard Wischermann is with BTS Broadcast Television Systems GmbH, Weiterstadt, Germany D-64331.
bio
Gerhard Wischermann is with BTS Broadcast Television Systems GmbH, Weiterstadt, Germany, where he is involved in project management and responsible for the development of the BTS noise-reducer family. Wischermann holds a Diplom-Engineer degree in communications engineering from the Technische Hochschule Darmstadt. In 1977 he joined BTS, where he worked on advanced developments in digital signal processing until taking on his current responsibilities. Wischermann has presented three papers at SMPTE conferences; two of these have been published in the Journal.
Copyright: © 1996 Society of Motion Picture and Television Engineers, Inc.

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Gerhard Wischermann; The Digital Wetgate: A Third-Generation Noise Reducer, SMPTE Journal ( Volume: 105, Issue: 2, February 1996); SMPTE, 1996. Available at https://doi.org/10.5594/J04670

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Gerhard Wischermann; The Digital Wetgate: A Third-Generation Noise Reducer, SMPTE Journal ( Volume: 105, Issue: 2, February 1996); SMPTE, 1996. Available at https://doi.org/10.5594/J04670

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Gerhard Wischermann; The Digital Wetgate: A Third-Generation Noise Reducer, SMPTE Journal ( Volume: 105, Issue: 2, February 1996); SMPTE, 1996. Available at https://doi.org/10.5594/J04670

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<span class="citation">Gerhard Wischermann; <cite>The Digital Wetgate: A Third-Generation Noise Reducer</cite>, SMPTE Journal ( Volume: 105, Issue: 2, February 1996); SMPTE, 1996. Available at <a href="https://doi.org/10.5594/J04670" target="_blank" rel="noopener">https://doi.org/10.5594/J04670</a></span>

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Gerhard Wischermann; The Digital Wetgate: A Third-Generation Noise Reducer, SMPTE Journal ( Volume: 105, Issue: 2, February 1996); SMPTE, 1996
doi: 10.5594/J04670
url: https://doi.org/10.5594/J04670

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Gerhard Wischermann; <cite id="bib-10-5594-j04670">The Digital Wetgate: A Third-Generation Noise Reducer</cite>, SMPTE Journal ( Volume: 105, Issue: 2, February 1996); SMPTE, 1996
<span class="doi">10.5594/J04670</span>
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