| US 7,548,277 B2 | ||
| Device and method for estimating the noise of a video signal | ||
| Jean-Yves Babonneau, L'Hermitage (France); Jacky Dieumegard, Rennes (France); and Olivier Le Meur, Talensac (France) | ||
| Assigned to Thomson Licensing, Boulogne-Billancourt (France) | ||
| Filed on Oct. 13, 2004, as Appl. No. 10/964,088. | ||
| Claims priority of application No. 03 12007 (FR), filed on Oct. 14, 2003. | ||
| Prior Publication US 2005/0128356 A1, Jun. 16, 2005 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. H04N 5/217 (2006.01) | ||
| U.S. Cl. 348—607 [348/620; 348/701] | 7 Claims |
| 1. Device for estimating a noise level of a video signal representing image sequences comprising
movement compensated interpolation means generating a movement compensated output signal,
a recursive filter designed to receive on a first input the movement compensated output signal and on a second input the video
signal, said recursive filter generating a video output signal, the video output signal being compensated by the movement
compensated interpolation means to produce the movement compensated output signal,
means of calculating a difference between the video signal and the movement compensated output signal,
means of estimating the noise level of the video signal according to the calculated difference and a maximum threshold delimiting
the calculated difference, wherein the means of estimating includes:
a comparator for comparing each calculated difference to the maximum threshold; and
an accumulator for accumulating the calculated differences that are less than the maximum threshold to produce an accumulated
sum of differences used to estimate the noise level of the video signal according to the calculated difference and the maximum
threshold.
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