All image quality metrics you need in one package.
Sewar is a python package for image quality assessment using different metrics. You can check documentation here.
- [x] Mean Squared Error (MSE)
- [x] Root Mean Sqaured Error (RMSE)
- [x] Peak Signal-to-Noise Ratio (PSNR) 
- [x] Structural Similarity Index (SSIM) 
- [x] Universal Quality Image Index (UQI) 
- [x] Multi-scale Structural Similarity Index (MS-SSIM) 
- [x] Erreur Relative Globale Adimensionnelle de Synthèse (ERGAS) 
- [x] Spatial Correlation Coefficient (SCC) 
- [x] Relative Average Spectral Error (RASE) 
- [x] Spectral Angle Mapper (SAM) 
- [x] Spectral Distortion Index (D_lambda) 
- [x] Spatial Distortion Index (D_S) 
- [x] Quality with No Reference (QNR) 
- [x] Visual Information Fidelity (VIF) 
- [x] Block Sensitive - Peak Signal-to-Noise Ratio (PSNR-B) 
- [ ] Add command-line support for No-reference metrics
Just as simple as
pip install sewar
a simple example to use UQI
>>> from sewar.full_ref import uqi >>> uqi(img1,img2) 0.9586952304831419
Example usage for command line interface
sewar [metric] [GT path] [P path] (any extra parameters)
An example to use SSIM
foo@bar:~$ sewar ssim images/ground_truth.tif images/deformed.tif -ws 13 ssim : 0.8947009811410856
Available metrics list
mse, rmse, psnr, rmse_sw, uqi, ssim, ergas, scc, rase, sam, msssim, vifp, psnrb
Special thanks to @sachinpuranik99 and @sunwj.
 "Image quality assessment: from error visibility to structural similarity." 2004)  "A universal image quality index." (2002)  "Multiscale structural similarity for image quality assessment." (2003)  "Quality of high resolution synthesised images: Is there a simple criterion?." (2000)  "A wavelet transform method to merge Landsat TM and SPOT panchromatic data." (1998)  "Fusion of multispectral and panchromatic images using improved IHS and PCA mergers based on wavelet decomposition." (2004)  "Discrimination among semi-arid landscape endmembers using the spectral angle mapper (SAM) algorithm." (1992)  "Multispectral and panchromatic data fusion assessment without reference." (2008)  "Image information and visual quality." (2006)  "Quality Assessment of Deblocked Images" (2011)
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