# Perceptual Sharpness Index (PSI)
A Perceptual Image Sharpness Metric Based on Local Edge Gradient Analysis

MATLAB implementation of the Perceptual Sharpness Index (PSI)

* `PSI.m` - Computes the Perceptual Sharpness Index (PSI).
* `PSI_demo.m` - Demonstrates the computation for a single image.

> Note that the performance of the algorithm may slightly alter with the MATLAB version used (due to MATLAB's edge function).

Please cite the following [paper](http://feichtenhofer.github.io/pubs/Feichtenhofer_Image_Sharpness_Metric_IEEE_SPL_2013.pdf) if you use this code.

```
#!bibtex

@article{feichtenhofer2013perceptual,
  title={A perceptual image sharpness metric based on local edge gradient analysis},
  author={Feichtenhofer, Christoph and Fassold, Hannes and Schallauer, Peter},
  journal={Signal Processing Letters, IEEE},
  volume={20},
  number={4},
  pages={379--382},
  year={2013},
  publisher={IEEE}
}
```

Christoph Feichtenhofer

cfeichtenhofer AT gmail.com

http://feichtenhofer.github.io