H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 5/21 (2006.01) G06T 7/40 (2006.01) H04N 3/15 (2006.01) H04N 5/335 (2006.01) H04N 7/26 (2006.01) H04N 17/00 (2006.01)
Patent
CA 2413067
Noise can be introduced into a video image in many ways and can significantly impact the effectiveness of video processing algorithms. This paper proposes a fast automated white-noise estimation method that gives reliable estimates in video images with low and high noise levels and images with smooth and textured areas. This technique finds homogeneous blocks and estimates the noise variance in these blocks. It takes video image structure into account. The method uses a new measure to determine if a block is homogeneous. The proposed method selects intensity-homogeneous blocks in a video image by rejecting blocks with structure using a new structure analyzer. The analyzer used is based on high-pass operators and special masks for corners to allow implicit detection of structure and to stabilize the homogeneity estimation. For typical video quality (PSNR of 20-40 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 surveillance or broadcasts. The method performs well even in images with few smooth areas and in highly noisy images.
Amer Aishy
Concordia University
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