Table 1 Common evaluation metrics for multifocal image fusion. It can be categorized as source image-based and fused image-based metrics.

From: A new generative method for multi-focus image fusion of underwater micro bubbles

Category

Methods

Fused image-based

Cross entropy (CE)23,Average gradient (AG)24

Edge intensity (EI)25,Standard deviation (SD)26

Spatial frequency (SF)27

Source image-based

Entropy (EN)28,Mutual information (MI)29

Feature mutual information (FMI)30

Normalized mutual information (NMI)31

Peak signal-to-noise ratio (PSNR)32

Nonlinear correlation information entropy(\(Q_{NCIE}\))33

Edge based similarity measurement(\(Q^{AB/F}\))34

Structural similarity index measure (SSIM)35

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