Ajout de paramètres optionnels pour g_viz_field et g_stabilize + un GUI pour g_rect.

src/utilities/g_rgb2gray.m

+function I = g_rgb2gray(X)
+%G_RGB2GRAY Convert RGB image or colormap to grayscale.
+%   G_RGB2GRAY converts RGB images to grayscale by eliminating the
+%   hue and saturation information while retaining the
+%   luminance.
+%
+%   If RGB2GRAY exists in the Matlab path, it overrides this function and
+%   uses the one from the toolbox instead.
+%
+%   I = G_RGB2GRAY(RGB) converts the truecolor image RGB to the
+%   grayscale intensity image I.
+%
+%   NEWMAP = G_RGB2GRAY(MAP) returns a grayscale colormap
+%   equivalent to MAP.
+%
+%   Class Support
+%   -------------  
+%   If the input is an RGB image, it can be uint8, uint16, double, or
+%   single. The output image I has the same class as the input image. If the
+%   input is a colormap, the input and output colormaps are both of class
+%   double.
+%
+%   Example
+%   -------
+%   I = imread('board.tif');
+%   J = rgb2gray(I);
+%   figure, imshow(I), figure, imshow(J);
+%
+%   [X,map] = imread('trees.tif');
+%   gmap = rgb2gray(map);
+%   figure, imshow(X,map), figure, imshow(X,gmap);
+%
+%   See also IND2GRAY, NTSC2RGB, RGB2IND, RGB2NTSC, MAT2GRAY.
+
+%   Original file: Copyright 1992-2013 The MathWorks, Inc. 
+%   And some changes by me.
+
+if exist('rgb2gray','file')
+    I = rgb2gray(X);
+else
+X        = parse_inputs(X);
+origSize = size(X);
+
+% Determine if input includes a 3-D array 
+threeD = (ndims(X)==3);
+
+% Calculate transformation matrix
+T    = inv([1.0 0.956 0.621; 1.0 -0.272 -0.647; 1.0 -1.106 1.703]);
+coef = T(1,:);
+
+if threeD
+  %RGB
+  
+  % Do transformation
+  if isa(X, 'double') || isa(X, 'single')
+
+    % Shape input matrix so that it is a n x 3 array and initialize output matrix  
+    X          = reshape(X(:),origSize(1)*origSize(2),3);
+    sizeOutput = [origSize(1), origSize(2)];
+    I = X * coef';
+    I = min(max(I,0),1);
+
+    %Make sure that the output matrix has the right size
+    I = reshape(I,sizeOutput);
+    
+  elseif isa(X,'uint8')
+    % Transforms to double to do the transformations as some functions are
+    % not available without the Image Processing toolbox.
+    I = uint8(g_rgb2gray(double(X)/255)*255);
+  elseif isa(X,'uint16')
+    I = uint16(g_rgb2gray(double(X)/255)*255);
+  end
+
+else
+  I = X * coef';
+  I = min(max(I,0),1);
+  I = [I,I,I];
+end
+
+end
+%%%
+%Parse Inputs
+%%%
+function X = parse_inputs(X)
+
+
+if ismatrix(X)
+  if (size(X,2) ~=3 || size(X,1) < 1)
+    error(' images:rgb2gray:invalidSizeForColormap')
+  end
+  if ~isa(X,'double')
+    error(' images:rgb2gray:notAValidColormap')
+  end
+elseif (ndims(X)==3)
+    if ((size(X,3) ~= 3))
+      error(' images:rgb2gray:invalidInputSizeRGB')
+    end
+else
+  error(' images:rgb2gray:invalidInputSize')
+end
+  
+
+%no logical arrays
+if islogical(X)
+  error(' images:rgb2gray:invalidType')
+end