Multi-Focus Image Fusion Using Geometric Algebra Based Discrete Fourier Transform

Abstract

For color image fusion, existing traditional algorithms regard each color image pixel as a scalar which may lose the relationships among spectral channels. In this paper, a novel multi-focus image fusion algorithm using geometric algebra based Discrete Fourier Transform (GA-DFT) is proposed. First, a novel Discrete Fourier Transform based on geometric algebra (GA) is provided. Second, the proposed algorithm represents the color image as a GA multivector by mapping the RGB channels into the GA space. Third, the variance is selected as a contrast measure to fuse the source images in GA space. The experimental results demonstrate that the proposed algorithm can achieve the comparable performance with its counterparts in terms of subjective quality evaluation, and outperform most of the traditional algorithms in terms of objective quality metrics, indicating good performance in image fusion applications.

Pansharpening scheme using spatial detail injection–based convolutional neural networks

“…A CNN-based model is prepared for the extraction of the spatial detail information of the PAN image and provides better spatial and spectral resolution. It is justified by applying different transfer functions such as wavelet transform (WT) [16,37], discrete Fourier transform (DFT) [49] and Fractional Fourier transform (FrFT) [15] at the place of CNN in the proposed scheme. The qualitative results of the methods are provided in Figure 5a-e and quantitative results are shown in Table 2 for the IKONOS satellite dataset.…”

Analisa Faktor Yang Mempengaruhi Kualitas Tidur Lansia Di Panti

“…Hasil Penelitian (Brewster et al, 2019) menunjukan bahwa lingkungan yang bising, kotor dan sempit dapat berdampak negatif pada fisiologis, perilaku dan fungsi kognitif hal ini dapat mengganggu tidur yang pada akhirnya mempengaruhi kualitas tidur lansia. Pada penelitian (Li & Jiang, 2020) lansia mengeluh tidak bisa tidur karena lingkungan yang kotor dan berbau. 70% lansia mengaku tidak nyaman dengan bau busuk yang mengganggu tidur mereka.…”

“…Kualitas tidur mencakup durasi tidur, latensi tidur, serta aspek subjektif seperti tidur malam dan istirahat. Kualitas yang baik dilihat dari kebugaran, kesehatan dan bagaimana seseorang itu terlihat segar di pagi hari (Li & Jiang, 2020) Masalah kualitas tidur pada lansia seharusnya dapat menjadi perhatian yang lebih karena jika dibiarkan dapat menyebabkan berbagai macam hal yang merugikan baik untuk kesehatan tubuh ataupun menurunkan angka harapan hidup lansia. (Cherukuri et al 2018).…”

Towards Reducing Severe Defocus Spread Effects for Multi-Focus Image Fusion via an Optimization Based Strategy

“…In other words, MMFNet segments the scene into three parts, i.e., a focus region, a defocus region and the boundary. The fused image is computed by [2] + B f (X [1] , X [2] ),…”

“…The first one is the transform domain based methods. Its basic idea is to utilize a transformer (e.g., discrete Fourier transform [2], discrete wavelet transform [3], non-subsampled contourlet transform [4], etc.) to convert source images into the feature domain, in which salient features can be easily detected.…”