How to read special characters using MATLAB in OCR ?

Question

Shavi 2012-4-20

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/36057-how-to-read-special-characters-using-matlab-in-ocr

评论： Walter Roberson 2018-12-20

How to read special characters using MATLAB in OCR ? Special characters like + , / | etc.

or

We can say that how to modify read_letter function which is used to read letters in OCR?

Please help me... Thanks

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Samreen kayani 2018-12-20

在 MATLAB Online 中打开

%CREATE TEMPLATES
%Letter
clc;
close all;
A=imread('letters_numbers\A.bmp');B=imread('letters_numbers\B.bmp');
C=imread('letters_numbers\C.bmp');D=imread('letters_numbers\D.bmp');
E=imread('letters_numbers\E.bmp');F=imread('letters_numbers\F.bmp');
G=imread('letters_numbers\G.bmp');H=imread('letters_numbers\H.bmp');
I=imread('letters_numbers\I.bmp');J=imread('letters_numbers\J.bmp');
K=imread('letters_numbers\K.bmp');L=imread('letters_numbers\L.bmp');
M=imread('letters_numbers\M.bmp');N=imread('letters_numbers\N.bmp');
O=imread('letters_numbers\O.bmp');P=imread('letters_numbers\P.bmp');
Q=imread('letters_numbers\Q.bmp');R=imread('letters_numbers\R.bmp');
S=imread('letters_numbers\S.bmp');T=imread('letters_numbers\T.bmp');
U=imread('letters_numbers\U.bmp');V=imread('letters_numbers\V.bmp');
W=imread('letters_numbers\W.bmp');X=imread('letters_numbers\X.bmp');
Y=imread('letters_numbers\Y.bmp');Z=imread('letters_numbers\Z.bmp');
%lower case letters
a=imread('letters_numbers\a.png');b=imread('letters_numbers\b.png');
c=imread('letters_numbers\c.png');d=imread('letters_numbers\d.png');
e=imread('letters_numbers\e.png');f=imread('letters_numbers\f.png');
g=imread('letters_numbers\g.png');h=imread('letters_numbers\h.png');
i=imread('letters_numbers\i.png');j=imread('letters_numbers\j.png');
k=imread('letters_numbers\k.png');l=imread('letters_numbers\l.png');
m=imread('letters_numbers\m.png');n=imread('letters_numbers\n.png');
o=imread('letters_numbers\o.png');p=imread('letters_numbers\p.png');
q=imread('letters_numbers\q.png');r=imread('letters_numbers\r.png');
s=imread('letters_numbers\s.png');t=imread('letters_numbers\t.png');
u=imread('letters_numbers\u.png');v=imread('letters_numbers\v.png');
w=imread('letters_numbers\w.png');x=imread('letters_numbers\x.png');
y=imread('letters_numbers\y.png');z=imread('letters_numbers\z.png');
%Number
one=imread('letters_numbers\1.bmp');  two=imread('letters_numbers\2.bmp');
three=imread('letters_numbers\3.bmp');four=imread('letters_numbers\4.bmp');
five=imread('letters_numbers\5.bmp'); six=imread('letters_numbers\6.bmp');
seven=imread('letters_numbers\7.bmp');eight=imread('letters_numbers\8.bmp');
nine=imread('letters_numbers\9.bmp'); zero=imread('letters_numbers\0.bmp');
%*-*-*-*-*-*-*-*-*-*-*-
letter=[A B C D E F G H I J K L M...
    N O P Q R S T U V W X Y Z];
number=[one two three four five...
    six seven eight nine zero];
lowercase = [a b c d e f g h i j k ...
     l m n o p q r s t u v w x y z];
character=[letter number lowercase];
templates=mat2cell(character,42,[24 24 24 24 24 24 24 ...
    24 24 24 24 24 24 24 ...
    24 24 24 24 24 24 24 ...
    24 24 24 24 24 24 24 ...
    24 24 24 24 24 24 24 24 ...
    24 24 24 24 24 24 24 24 ...
    24 24 24 24 24 24 24 24 ...
    24 24 24 24 24 24 24 24 ...
    24 24]);
save ('templates','templates')
clear all

i am facing problem while load .bmp files

can you please help me

Walter Roberson 2018-12-20

What leads you to suspect that you are having trouble loading bmp files?

Are you using MS Windows? Do you have a directory named letters_numbers in your current folder? Do the noted files exist inside that folder?

The code given is not suitable for Mac or Linux: for those, all of the \ inside the file names should be changed to / . MS Windows supports / as well as \ so the code would be more general if / were to be used. But better yet would be to convert to use a named directory and fullfile()

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Answer 1

Aliyu Abdu 2012-5-3

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/36057-how-to-read-special-characters-using-matlab-in-ocr#answer_46555

在 MATLAB Online 中打开

You can check for "OCR.." in the "file exchanger", or you can simply try the code;

%CREATE TEMPLATES
%Letter
clc;
close all;
A=imread('letters_numbers\A.bmp');B=imread('letters_numbers\B.bmp');
C=imread('letters_numbers\C.bmp');D=imread('letters_numbers\D.bmp');
E=imread('letters_numbers\E.bmp');F=imread('letters_numbers\F.bmp');
G=imread('letters_numbers\G.bmp');H=imread('letters_numbers\H.bmp');
I=imread('letters_numbers\I.bmp');J=imread('letters_numbers\J.bmp');
K=imread('letters_numbers\K.bmp');L=imread('letters_numbers\L.bmp');
M=imread('letters_numbers\M.bmp');N=imread('letters_numbers\N.bmp');
O=imread('letters_numbers\O.bmp');P=imread('letters_numbers\P.bmp');
Q=imread('letters_numbers\Q.bmp');R=imread('letters_numbers\R.bmp');
S=imread('letters_numbers\S.bmp');T=imread('letters_numbers\T.bmp');
U=imread('letters_numbers\U.bmp');V=imread('letters_numbers\V.bmp');
W=imread('letters_numbers\W.bmp');X=imread('letters_numbers\X.bmp');
Y=imread('letters_numbers\Y.bmp');Z=imread('letters_numbers\Z.bmp');
%lower case letters
a=imread('letters_numbers\a.png');b=imread('letters_numbers\b.png');
c=imread('letters_numbers\c.png');d=imread('letters_numbers\d.png');
e=imread('letters_numbers\e.png');f=imread('letters_numbers\f.png');
g=imread('letters_numbers\g.png');h=imread('letters_numbers\h.png');
i=imread('letters_numbers\i.png');j=imread('letters_numbers\j.png');
k=imread('letters_numbers\k.png');l=imread('letters_numbers\l.png');
m=imread('letters_numbers\m.png');n=imread('letters_numbers\n.png');
o=imread('letters_numbers\o.png');p=imread('letters_numbers\p.png');
q=imread('letters_numbers\q.png');r=imread('letters_numbers\r.png');
s=imread('letters_numbers\s.png');t=imread('letters_numbers\t.png');
u=imread('letters_numbers\u.png');v=imread('letters_numbers\v.png');
w=imread('letters_numbers\w.png');x=imread('letters_numbers\x.png');
y=imread('letters_numbers\y.png');z=imread('letters_numbers\z.png');
%Number
one=imread('letters_numbers\1.bmp');  two=imread('letters_numbers\2.bmp');
three=imread('letters_numbers\3.bmp');four=imread('letters_numbers\4.bmp');
five=imread('letters_numbers\5.bmp'); six=imread('letters_numbers\6.bmp');
seven=imread('letters_numbers\7.bmp');eight=imread('letters_numbers\8.bmp');
nine=imread('letters_numbers\9.bmp'); zero=imread('letters_numbers\0.bmp');
%*-*-*-*-*-*-*-*-*-*-*-
letter=[A B C D E F G H I J K L M...
    N O P Q R S T U V W X Y Z];
number=[one two three four five...
    six seven eight nine zero];
lowercase = [a b c d e f g h i j k ...
     l m n o p q r s t u v w x y z];
character=[letter number lowercase];
templates=mat2cell(character,42,[24 24 24 24 24 24 24 ...
    24 24 24 24 24 24 24 ...
    24 24 24 24 24 24 24 ...
    24 24 24 24 24 24 24 ...
    24 24 24 24 24 24 24 24 ...
    24 24 24 24 24 24 24 24 ...
    24 24 24 24 24 24 24 24 ...
    24 24 24 24 24 24 24 24 ...
    24 24]);
save ('templates','templates')
clear all

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Shavi 2012-5-7

okay dats fine..

The problem is suppose we have smallcase letter 'c' and uppercase letter 'C'.

So i want to know how to differentiate between these two while matching templates?

Thanks Abdu!!

ayushi 2016-6-26

sir i can't able to find the correct example for special characters template matching method how to do the template matching of "@,+)*&%^$" all those special characters please help me to find out the correct procedure i have already cropped the templates and stored it in the folder and now i am not getting how to add those in the array when i am directly writting the special characters its showing error how to do please guide me ..thank you

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Answer 2

Walter Roberson 2012-4-20

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/36057-how-to-read-special-characters-using-matlab-in-ocr#answer_45150

Mathworks does not supply any routine named "read_letter".

I see that there are multiple contributions in the MATLAB File Exchange that include routines named "read_letter". If you are using one of those, people would need to know which one in order to have a chance of providing advice.

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Shavi 2012-5-2

%function read_letter

function letter=read_letter(imagn,num_letras)

% Computes the correlation between template and input image

% and its output is a string containing the letter.

% Size of 'imagn' must be 42 x 24 pixels

% Example:

% imagn=imread('D.bmp');

% letter=read_letter(imagn)

%load templates

global templates

comp=[ ];

for n=1:num_letras

sem=corr2(templates{1,n},imagn);

comp=[comp sem];

%pause(1)

end

vd=find(comp==max(comp));

%*-*-*-*-*-*-*-*-*-*-*-*-*-

if vd==1

letter='A';

elseif vd==2

letter='B';

elseif vd==3

letter='C';

elseif vd==4

letter='D';

elseif vd==5

letter='E';

elseif vd==6

letter='F';

elseif vd==7

letter='G';

elseif vd==8

letter='H';

elseif vd==9

letter='I';

elseif vd==10

letter='J';

elseif vd==11

letter='K';

elseif vd==12

letter='L';

elseif vd==13

letter='M';

elseif vd==14

letter='N';

elseif vd==15

letter='O';

elseif vd==16

letter='P';

elseif vd==17

letter='Q';

elseif vd==18

letter='R';

elseif vd==19

letter='S';

elseif vd==20

letter='T';

elseif vd==21

letter='U';

elseif vd==22

letter='V';

elseif vd==23

letter='W';

elseif vd==24

letter='X';

elseif vd==25

letter='Y';

elseif vd==26

letter='Z';

%*-*-*-*-*

elseif vd==27

letter='1';

elseif vd==28

letter='2';

elseif vd==29

letter='3';

elseif vd==30

letter='4';

elseif vd==31

letter='5';

elseif vd==32

letter='6';

elseif vd==33

letter='7';

elseif vd==34

letter='8';

elseif vd==35

letter='9';

elseif vd==36

letter='0';

%********

elseif vd==37

letter='a';

elseif vd==38

letter='b';

elseif vd==39

letter='c';

elseif vd==40

letter='d';

elseif vd==41

letter='e';

elseif vd==42

letter='f';

elseif vd==43

letter='g';

elseif vd==44

letter='h';

elseif vd==45

letter='i';

elseif vd==46

letter='j';

elseif vd==47

letter='k';

elseif vd==48

letter='l';

elseif vd==49

letter='m';

elseif vd==50

letter='n';

elseif vd==51

letter='o';

elseif vd==52

letter='p';

elseif vd==53

letter='q';

elseif vd==54

letter='r';

elseif vd==55

letter='s';

elseif vd==56

letter='t';

elseif vd==57

letter='u';

elseif vd==58

letter='v';

elseif vd==59

letter='w';

elseif vd==60

letter='x';

elseif vd==61

letter='y';

elseif vd==62

letter='z';

elseif vd==63

letter='|';

elseif vd==64

letter='|';

elseif vd==65

letter='|';

else

letter='';

%*-*-*-*-*

end

Walter Roberson 2012-5-3

Is "c" a "special character", or did you switch topics?

Shavi 2012-5-7

no no ...

actually c is a smallcase letter 'C'.

So i want to know how to differentiate between these two while matching templates?

I know that this ques is not about special characters but i need the solution for this one too.

Thanks Roberson!!

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Answer 3

HanBaba 2018-3-25

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/36057-how-to-read-special-characters-using-matlab-in-ocr#answer_311864

Can anyone please tell me why we have taken 42 & 24 ? any theory behind this ? I'll be waiting for your positive reply !

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Walter Roberson 2018-3-25

This is just based upon the available training data.

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