Multispectral image denoising with optimized vector non-local mean filter

Abstract

Nowadays, many applications rely on images of high quality to ensure good performance in conducting their tasks. However, noise goes against this objective as it is an unavoidable issue in most applications. Therefore, it is essential to develop techniques to attenuate the impact of noise, while maintaining the integrity of relevant information in images. We propose in this work to extend the application of the Non-Local Means filter (NLM) to the vector case and apply it for denoising multispectral images. The objective is to benefit from the additional information brought by multispectral imaging systems. The NLM filter exploits the redundancy of information in an image to remove noise. A restored pixel is a weighted average of all pixels in the image. In our contribution, we propose an optimization framework where we dynamically fine tune the NLM filter parameters and attenuate its computational complexity by considering only pixels which are most similar to each other in computing a restored pixel. Filter parameters are optimized using Stein's Unbiased Risk Estimator (SURE) rather than using ad hoc means. Experiments have been conducted on multispectral images corrupted with additive white Gaussian noise and PSNR and similarity comparison with other approaches are provided to illustrate the efficiency of our approach in terms of both denoising performance and computation complexity.

Optimal weighted bilateral filter with dual‐range kernel for Gaussian noise removal

“…SURE provides a means of the unbiased estimate to MSE without the knowledge of reference , and is widely used for optimal parameter selection of the denoising method by minimising the risk estimate [24, 25].…”

A Novel Adaptive Non-Local Means-Based Nonlinear Fitting for Visibility Improving

“…Lianghai et al [10] proposed a two-stage quaternion switching vector filter for color impulse noise removal. Ahmed Ben Said et al [11] proposed a Multispectral image denoising with optimized vector non-local mean filter to illustrate the efficiency of the approach in terms of both denoising performance and computation complexity. Jonatas Lopes de Paivaa et al [12] proposed an approach based on hybrid genetic algorithm (HGA) applied to the image denoising problem.…”