## 2 部分代码

function y = isrgb(x)%ISRGB Return true for RGB image.%   FLAG = ISRGB(A) returns 1 if A is an RGB truecolor image and%   0 otherwise.%%   ISRGB uses these criteria to determine if A is an RGB image:%%   - If A is of class double, all values must be in the range%     [0,1], and A must be M-by-N-by-3.%%   - If A is of class uint8 or uint16, A must be M-by-N-by-3.%%   Note that a four-dimensional array that contains multiple RGB%   images returns 0, not 1.%%   Class Support%   -------------%   A can be of class uint8, uint16, or double. If A is of %   class logical it is considered not to be RGB.%%   See also ISBW, ISGRAY, ISIND.%   Copyright 1993-2003 The MathWorks, Inc.  %   $Revision: 1.15.4.2$  $Date: 2003/08/23 05:52:55$wid = sprintf('Images:%s:obsoleteFunction',mfilename);str1= sprintf('%s is obsolete and may be removed in the future.',mfilename);str2 = 'See product release notes for more information.';warning(wid,'%s\n%s',str1,str2);y = size(x,3)==3;if y   if isa(x, 'logical')      y = false;   elseif isa(x, 'double')      % At first just test a small chunk to get a possible quick negative        m = size(x,1);      n = size(x,2);      chunk = x(1:min(m,10),1:min(n,10),:);               y = (min(chunk(:))>=0 && max(chunk(:))<=1);      % If the chunk is an RGB image, test the whole image      if y         y = (min(x(:))>=0 && max(x(:))<=1);      end   endend

## 4 参考文献

[1]李小琦. 基于Matlab的图像阈值分割算法研究[J]. 软件导刊, 2014, 13(12):3.