1. Fast and Reliable Structure-Oriented Video Noise Estimation.
- Author
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Amer, Aishy and Dubois, Eric
- Subjects
- *
BROADCASTING industry , *ESTIMATION theory , *ALGORITHMS , *MATHEMATICAL statistics , *COMMUNICATIONS industries , *TELECOMMUNICATION systems - Abstract
Noise can significantly impact the effectiveness of video processing algorithms. This paper proposes a fast white-noise variance estimation that is reliable even in images with large textured areas. This method finds intensity-homogeneous blocks first and then estimates the noise variance in these blocks, taking image structure into account This paper proposes a new measure to determine homogeneous blocks and a new structure analyzer for rejecting blocks with structure. This analyzer is based on high-pass operators and special masks for corners to stabilize the homogeneity estimation. For typical video quality (PSNR of 29-40 dB), the proposed method outperforms other methods significantly and the worst-case estimation error is 3 dB, which is suitable for real applications such as video broadcasts. The method performs well both in highly noisy and good-quality images. It also works well in images including few uniform blocks. [ABSTRACT FROM AUTHOR]
- Published
- 2005
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