Sharpness Estimation From Image Gradients

The simplest form of estimating the sharpness feature from a grayscale image

Sharpness estimation using gradients
This is the most simple and basic measure of sharpness. Although many great other techniques exist, even this primitive estimation algorithm finds itself decent practical usage.
The file reads an image and iteratively smooths it more and more to present how sharpness reduces. The method is tested against mean and unsharp (sharpen) filtering.

Usage: Just execute this file. (Remember to have lena.jpg next to this file). All results will be printed to matlab console.

Copyright (c) 2011, Tolga Birdal <http://www.tbirdal.me>