Description of slimg2mat

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slimg2mat

PURPOSE

SLIMG2MAT Converts an image array to a double matrix

SYNOPSIS

function M = slimg2mat(img)

DESCRIPTION

SLIMG2MAT Converts an image array to a double matrix

 $ Syntax $
   - M = slimg2mat(img)

 % Arguments $
   - img:      the image
   - M:        the converted matrix

 $ Description $
   - M = slimg2mat(img) converts a variety of image arrays to a double
     2D matrix. In detail, the RGB image will be turned to a grayscale 
     image, in addition, the value of uint8 or other integer types will
     be converted to double value with range [0, 1] by im2double.

 $ History $
   - Created by Dahua Lin, on Jul 25th, 2006

CROSS-REFERENCE INFORMATION

This function calls:

This function is called by:

• slimgsetprep SLIMGSETPREP organizes the images in a MATLAB friendly way

SOURCE CODE

0001 function M = slimg2mat(img)
0002 %SLIMG2MAT Converts an image array to a double matrix
0003 %
0004 % $ Syntax $
0005 %   - M = slimg2mat(img)
0006 %
0007 % % Arguments $
0008 %   - img:      the image
0009 %   - M:        the converted matrix
0010 %
0011 % $ Description $
0012 %   - M = slimg2mat(img) converts a variety of image arrays to a double
0013 %     2D matrix. In detail, the RGB image will be turned to a grayscale
0014 %     image, in addition, the value of uint8 or other integer types will
0015 %     be converted to double value with range [0, 1] by im2double.
0016 %
0017 % $ History $
0018 %   - Created by Dahua Lin, on Jul 25th, 2006
0019 %
0020 
0021 
0022 % color processing
0023 d = ndims(img);
0024 n = size(img, 3);
0025 if d > 3 || n == 2 || n > 3
0026     error('sltoolbox:invalidimg', ...
0027         'The image should be 1-channel gray image or 2-channel RGB image');
0028 end
0029 if n == 3
0030     img = rgb2gray(img);
0031 end
0032 
0033 % type conversion
0034 if isa(img, 'double')
0035     M = img;
0036 else
0037     M = im2double(img);
0038 end
0039 
0040 
0041

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