Include more Metric Distance algorithms:

• Color cost functions: Jjnd, Jil and Jhl
• DEitp
• CIE Delta-E 2016 (simply an Euclidean of CAM16-UCS)
• PSNR-HSV (in VMAF plugin)
• PSNR-HMA
• IW-PSNR
• iCAM
• Image Fidelity Metrics (IFM, used with YCxCz)
• VMAF (Video Multi-Method Assessment Fusion)
• SRC (Spearman Rank-order Correlation) (monotonicity prediction )
• PCC (Pearson linear Correlation) (prediction linearity)
• KRC (Kendall Rank Correlation)
• VIF (Visual Information Fidelity)
• VSI
• MCPD (Mean Co-Located Pixel Difference)
• DLM (Detail Loss Metric)
• SFF
• DSCSI
• ADD-GSIM
• SCQI
• INRF-IQ (Intrinsically Nonlinear Receptive Field Image Quality)
• VQM (Video Quality Model)
• VQMG (General Video Quality Model)
• MOVIE (MOtion-tuned Video Integrity Evaluation)
• PEVQ (Perceptual Evaluation of Video Quality)
• BRISQUE (Blind/Referenceless Image Spatial Quality Evaluator)
• NIQE (Naturalness Image Quality Evaluator)
• PIQE (Perception based Image Quality Evaluator).
• Video BLIINDS (BLind Image Integrity Notator using DCT-Statistics)
• DIIVINE (Distortion Identification-based Image Verity and INtegrity Evalutation)
• NRQA-NRIQA (No-Reference Quality Assessment for JPEG2000 Compressed Images using Natural Scene Statistics)
• NRQA-DCT (No-Reference Quality Assessment algorithm for Block-Based compression artifacts)
• NIMA: Neural Image Assessment
• MANIQA: Multi-dimension Attention Network for no-reference Image Quality Assessment

SSIM Related:

• SSIMPLUS
• 4-SSIM
• G-SSIM
• SSIM HSV
• IW-SSIM
• SR_SSIM
• DSSIM