Introduction - If you have any usage issues, please Google them yourself
		 
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This the matlab implementation of following noise level estimation:
Xinhao Liu, Masayuki Tanaka and Masatoshi Okutomi
Noise Level Estimation Using Weak Textured Patches of a Single Noisy Image
IEEE International Conference on Image Processing (ICIP), 2012.
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Copyright (C) 2012 Masayuki Tanaka. All rights reserved.
mtanaka@ctrl.titech.ac.jp 
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 Contents
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* NoiseLevel.m
 The main code of the noise level estimation.
 You can show the description by
 > help NoiseLevel
 
 demo.m also includes simple usage.
 This algorithm is implemented with only single m file. 
 
* demo.m
 Demonstration example.
* lena.png
 Sample image.
* README.txt
 This file.
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 Note
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We used the maximum eigenvalue of the gradient covariance matrix