A new metric based on extended spatial frequency and its application to DWT based fusion algorithms

Image Fusion Based on the \({\Delta ^{ - 1}} - T{V_0}\) Energy Function

“…The larger Q AB/F value indicates that the fused result contains more information from the input images. Spatial frequency (SF) measurement [30,31] is about the overall activity level in an image. The spatial frequency is defined as follows:…”

Adaptive Technique for Image Fusion based on Non-Subsampled Shearlet Transform-Spatial Frequency-Human Visual Factor

“…Images' space spatial frequency (SF) [11] can be reflected pixel points' active index. The more is the SF value, the more active is the images' pixel points.…”

Cognitive Image Fusion and Assessment

“…In recent years, a number of computational image fusion quality assessment metrics have therefore been proposed (e.g. Angell, 2005;Blum, 2006;Chari et al, 2005;Chen & Varshney, 2005;Chen & Varshney, 2007;Corsini et al, 2006;Cvejic et al, 2005a;Cvejic et al, 2005b;Piella & Heijmans, 2003;Toet & Hogervorst, 2003;Tsagiris & Anastassopoulos, 2004;Ulug & Claire, 2000;Wang & Shen, 2006;Xydeas & Petrovic, 2000;Yang et al, 2007;Zheng et al, 2007;Zhu & Jia, 2005). Although some of these metrics agree with human visual perception to some extent, most of them cannot predict observer performance for different input imagery and scenarios.…”