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19 January 2009 An image-noise filter with emphasis on low-frequency chrominance noise
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Chrominance noise appears as low frequency colored blotches throughout an image, especially in darker flat areas. The effect is more pronounced in lower light levels where the characteristic features are observed as irregularly shaped clusters of colored pixels that vary anywhere from 15 to 25 pixels across. This paper proposes a novel, simple and intuitive method of reducing chrominance noise in processed images while minimizing color bleeding artifacts. The approach is based on a hybrid multi scale spatial dual tree adaptive wavelet filter in hue-saturation-value color space. Results are provided in terms of comparisons on real images between the proposed method and another state of the art method.
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Radu V. Gheorghe, Sergiu R. Goma, and Milivoje Aleksic "An image-noise filter with emphasis on low-frequency chrominance noise", Proc. SPIE 7250, Digital Photography V, 72500B (19 January 2009); doi: 10.1117/12.805751;

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