Abstract
The transform-based multi-sensor image denoising methods are inefficient in restoring fine details and texture information of noisy images. The fixed and non-adaptive curvelet transform (CT) design limits its performance in image denoising tasks. Moreover, the Karhunen-Loeve Transform (KLT)-based multi-sensor image fusion techniques premise that high variance’s first two principal components are an excellent option for weights used for the weighted average multi-sensor source images. However, the selected weights are non-optimal in this method, considering the less relevant information of source images. The experimental section has several examples showing the key advantages of the proposed optimized CT-based natural image denoising technique over seven existing denoising methods. First, our image denoising method introduces a modified Meyer window (used in unequally-spaced fast Fourier transform (USFFT))-based novel optimized USFFT CT (OUSFFT CT) and a modified wrapping window (WW)-based novel optimized WW CT (OWW CT) to address non-adaptive nature of curvelet transform. These windows are used for the decomposition of noisy source images into low- and high-frequency coefficients. The coefficients are hard thresholds to remove the noisy artifacts in the source image. Moreover, the denoised images are used for fusion purposes to obtain fused images with less noise. Secondly, our proposed image fusion method presents an optimized algorithm to fuse multi-sensor source images. In this method, KLT based weights are optimized by considering more relative information of source images and improve the fused image’s information interpretation capability. The qualitative and quantitative evaluations of fused images show that our method provides better fusion results than five different state-of-the-art medical, multi-focus, and infrared image fusion methods. The proposed image denoising method has 1% and 2.2% increment on average of PSNR and SSIM values, respectively, compared to existing state-of-the-art methods. The proposed image fusion method has a 9.04% increment on the average value of image fusion metrics compared to existing state-of-the-art methods.
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Vishwakarma, A., Bhuyan, M.K. A curvelet-based multi-sensor image denoising for KLT-based image fusion. Multimed Tools Appl 81, 4991–5016 (2022). https://doi.org/10.1007/s11042-021-11570-z
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DOI: https://doi.org/10.1007/s11042-021-11570-z