Code covered by the BSD License

# Point Pattern Matching Algorithm for Hand Gesture / American Sign Language (ASL) Recognition

### Caglar Arslan (view profile)

17 Feb 2011 (Updated )

A demonstration of American Sign Language recognition by using a Point Pattern Matching Algorithm.

isrgb1(x)
```function y = isrgb1(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.
%

%   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str1= sprintf('%s is obsolete and may be removed in the future.',mfilename);
%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
end
end
```