Image Fusion Evaluation Metrics

This is a comprehensive collection of 13 image fusion performance metrics gathered from online sources, including Average Gradient, Edge Intensity, Information Entropy, Gray Mean Value, Standard Deviation (Mean Square Error MSE), Root Mean Square Error, Peak Signal-to-Noise Ratio (PSNR), Spatial Frequency (SF), Image Definition, Mutual Information (MI), Structural Similarity (SSIM), Cross Entropy, and Relative Standard Deviation. Let's share and discuss implementation approaches together!