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Universal Color to Gray Conversion

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Universal Color to Gray Conversion



11 May 2010 (Updated )

This function provides some methods to convert a color image to a gray-value image.

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The implemented methods are:
1) 'normal', 'standard': rgb2gray of Matlab; ITU-R Recommendation BT.601.
2) 'avg', 'average': the output is the average of all three channels.
3) 'minavg', 'min_avg', 'min_average', 'minimum_average': The minimum-average method introduced in [1] for document image processing. it has less color dependency.

[1] R. Farrahi Moghaddam and M. Cheriet, A multi-scale framework for adaptive binarization of degraded document images, Pattern Recognition, 43, pp. 2186--2198, 2010, DOI: 10.1016/j.patcog.2009.12.024

ugray0 = universal_color_to_gray_converter(u, method_flag, method_name);
      u is the input color image.
      method_flag is 'method'
      method_name is one of above mentioned methods.
      ugray0 is the output gray-level image.
ugray0 = universal_color_to_gray_converter(u);
      u is the input color image.
      ugray0 is the output gray-level image; in this case, the method is 'min_avg';

MATLAB release MATLAB 7.5 (R2007b)
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Comments and Ratings (2)
27 Oct 2012 Hossein Ziaei Nafchi

Thank you Dr. Farrahi Moghaddam.

13 Feb 2012 ranjeetsinh

really good

11 May 2010

removed unnecessary file

18 May 2010

A description/acknowledgment on the sample image is added.

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