MATLAB: Error in corr2 function in matlab

corr2MATLAB

I have created templates of number and symbols and want to match the vehicle number plate with template using corr2 function. While running the code got the following error
Error using corr2
Expected input number 1, A, to be two-dimensional.
MAtlab code for template creation
%CREATE TEMPLATES
one=imread('1.png'); 
one=imresize(one,[42 24]);
two=imread('2.png');
two=imresize(two,[42 24]);
three=imread('3.png');
three=imresize(three,[42 24]);
four=imread('4.png');
four=imresize(four,[42 24]);
five=imread('5.png'); 
five=imresize(five,[42 24]);
zero=imread('0.png');
zero=imresize(zero,[42 24]);
sign=imread('sign.png');
sign=imresize(sign,[42 24]);
number=[one two three four  five zero ];
character=[number sign];
NewTemplates1=mat2cell(character,42,[24 24 24 24 24 24 24], 3);
save ('NewTemplates1','NewTemplates1')
clear all
matlab code for reading the letter
load NewTemplates1 % Loads the templates of characters in the memory.
snap=imread('untitled.png');
snap=imresize(snap,[42 24]); % Resize the input image so it can be compared with the template's images.
comp=[ ];
for n=1:length(NewTemplates1)
    sem=corr2(NewTemplates1{1,n},snap); % Correlation the input image with every image in the template for best matching.
    comp=[comp sem]; % Record the value of correlation for each template's character.
end
vd=find(comp==max(comp)); % Find the index which correspond to the highest matched character.
%*-*-*-*-*-*-*-*-*-*-*-*-*-
% Accodrding to the index assign to 'letter'.
% Alphabets listings.
if vd==1 
    letter='1';
elseif vd==2 
    letter='2';
elseif vd==3
    letter='3';
elseif vd==4 
    letter='4';
elseif vd==5
    letter='5';
elseif vd==6
    letter='0';
elseif vd==7
    letter='sign';
end
For kind information: The size of individual component in template is 42x24x3 uint8 and the input image also same dimension. Please provide the suggestion to do further.

Best Answer

You are asking corr2 to operate on a 42 x 24 x 3 array. That is a 3d array which is not something that corr2 can use. Your array is 3d because you are carrying through rgb. You need to do each plane independently, or you need to switch to greyscale, or you need to reshape so that you are working in 2d.
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