彩色图像处理（RGB图像）

rgb=imread('001.bmp');%读入一幅图像

 fR=rgb(:,:,1);%

 fG=rgb(:,:,2);%三种分量RGB的分解

fB=rgb(:,:,3);%

 imshow(fB);%显示Blue分量

 rgb_img=cat(3,fR,fG,fB);%三个分量组合

 imshow(rgb)%显示原图

 figure,imshow(rgb_img);%显示合成图

 

 

%rgbcube%

function rgbcube(vx, vy, vz)

%RGBCUBE Displays an RGB cube on the MATLAB desktop.

%   RGBCUBE(VX, VY, VZ) displays an RGB color cube, viewed from point

%   (VX, VY, VZ).  With no input arguments, RGBCUBE uses (10, 10, 4)

%   as the default viewing coordinates.  To view individual color

%   planes, use the following viewing coordinates, where the first

%   color in the sequence is the closest to the viewing axis, and the 

%   other colors are as seen from that axis, proceeding to the right

%   right (or above), and then moving clockwise. 

%

%      -------------------------------------------------

%           COLOR PLANE                  ( vx,  vy,  vz)

%      -------------------------------------------------

%       Blue-Magenta-White-Cyan          (  0,   0,  10)

%       Red-Yellow-White-Magenta         ( 10,   0,   0)

%       Green-Cyan-White-Yellow          (  0,  10,   0)

%       Black-Red-Magenta-Blue           (  0, -10,   0)

%       Black-Blue-Cyan-Green            (-10,   0,   0)

%       Black-Red-Yellow-Green           (  0,   0, -10)

%

 

%   Copyright 2002-2004 R. C. Gonzalez, R. E. Woods, & S. L. Eddins

%   Digital Image Processing Using MATLAB, Prentice-Hall, 2004

%   $Revision: 1.5 $  $Date: 2003/10/13 00:52:14 $

 

% Set up parameters for function patch.

vertices_matrix = [0 0 0;0 0 1;0 1 0;0 1 1;1 0 0;1 0 1;1 1 0;1 1 1];

faces_matrix = [1 5 6 2;1 3 7 5;1 2 4 3;2 4 8 6;3 7 8 4;5 6 8 7];

colors = vertices_matrix; 

% The order of the cube vertices was selected to be the same as 

% the  order of the (R,G,B) colors (e.g., (0,0,0) corresponds to 

% black, (1,1,1) corresponds to white, and so on.)

 

% Generate RGB cube using function patch.

patch('Vertices', vertices_matrix, 'Faces', faces_matrix, ...

      'FaceVertexCData', colors, 'FaceColor', 'interp', ...

      'EdgeAlpha', 0) 

 

% Set up viewing point.

if nargin == 0

   vx = 10; vy = 10; vz = 4;

elseif nargin ~= 3

   error('Wrong number of inputs.')

end

axis off

view([vx, vy, vz])

axis square