Motion-compensated noise estimation for efficient prefiltering in a video encoder

For efficient prefiltering prior to video encoding, exact noise strength of an input video sequence should be found, but it is actually a very difficult process. This paper presents an accurate noise estimation scheme using multiresolution motion estimation in a video encoder. Firstly, if the multir...

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Bibliographic Details
Main Authors: Byung Cheol Song, Kang Wook Chun
Format: Conference Proceeding
Language:English
Subjects:
Additive noise
Data compression
Degradation
Discrete cosine transforms
Motion estimation
Noise reduction
Research and development
Video compression
Video sequences
Wiener filter
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Summary:For efficient prefiltering prior to video encoding, exact noise strength of an input video sequence should be found, but it is actually a very difficult process. This paper presents an accurate noise estimation scheme using multiresolution motion estimation in a video encoder. Firstly, if the multiresolution motion estimator finds minimum block-matching errors at the finest resolution and the middle resolution, the differences between the two block-matching errors are computed and averaged for all the macroblocks (MBs) in an input frame. Based on a property that the average difference of each frame is linearly proportional to its noisiness, the noise strength of the input frame is precisely estimated. Experimental results show that the proposed noise estimation is very accurate.
ISSN:1522-4880
2381-8549
DOI:10.1109/ICIP.2003.1246654