4 March 2021 Color-compressive bilateral filter and nonlocal means for high-dimensional images
Christina Karam, Kenjiro Sugimoto, Keigo Hirakawa
Author Affiliations +
Abstract

We propose accelerated implementations of bilateral filter (BF) and nonlocal means (NLM) called color-compressive bilateral filter (CCBF) and color-compressive nonlocal means (CCNLM). CCBF and CCNLM are random filters, whose Monte-Carlo averaged output images are identical to the output images of conventional BF and NLM, respectively. However, CCBF and CCNLM are considerably faster because the spatial processing of multiple color channels are combined into a single random filtering process. This implies that the complexity of CCBF and CCNLM is less sensitive to color dimension (e.g., hyperspectral images) relatively to other BF and NLM methods. We experimentally verified that the execution time of CCBF and CCNLM are faster than the existing “fast” implementations of BF and NLM, respectively.

© 2021 SPIE and IS&T 1017-9909/2021/$28.00© 2021 SPIE and IS&T
Christina Karam, Kenjiro Sugimoto, and Keigo Hirakawa "Color-compressive bilateral filter and nonlocal means for high-dimensional images," Journal of Electronic Imaging 30(2), 023001 (4 March 2021). https://doi.org/10.1117/1.JEI.30.2.023001
Received: 28 November 2020; Accepted: 15 February 2021; Published: 4 March 2021
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KEYWORDS
Optical filters

Image filtering

Convolution

Image processing

Hyperspectral imaging

Denoising

Gaussian filters

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