error found while writing in notepad using OCR

I get an error ehile writing in notepad which is last line in my code,which in have pasted below,my input imge is a score card(AFTER CROPPING FROM A IMAGE)i.e IND 77-4,wen i use OCR to write to note pad,i get output as IND 7ZK,CAN ANYONE TELL WHAT MISTAKE I HAVE MADE

% PRINCIPAL PROGRAM

warning off %#ok<WNOFF>

% Clear all

clc, close all, clear all

% Read image

imagen=imread('samp22.jpg');

% Show image

imshow(imagen);

title('INPUT IMAGE WITH NOISE'

% Convert to gray scale

if size(imagen,3)==3 %RGB image

    imagen=rgb2gray(imagen);

end

% Convert to BW

threshold = graythresh(imagen);

imagen =~im2bw(imagen,threshold);

% Remove all object containing fewer than 30 pixels

imagen = bwareaopen(imagen,30);

%Storage matrix word from image

%FIGURE,IM

word=[ ];

re=imagen;

%Opens text.txt as file for write

fid = fopen('text.txt', 'wt');

% Load templates

load templates

global templates

% Compute the number of letters in template file

num_letras=size(templates,2);

while 1

    %Fcn 'lines' separate lines in text

    [fl re]=lines(re);

    imgn=fl;

    %Uncomment line below to see lines one by one

    figure,imshow(fl);pause(0.5)    

    %-----------------------------------------------------------------     
    % Label and count connected components

    [L Ne] = bwlabel(imgn);    

    for n=1:Ne

        [r,c] = find(L==n);

        % Extract letter

        n1=imgn(min(r):max(r),min(c):max(c));  

        % Resize letter (same size of template)

        img_r=imresize(n1,[42 24]);

         %imshow(img_r);pause(0.5)
        %-------------------------------------------------------------------
        % Call fcn to convert image to text

        letter=read_letter(img_r,num_letras);

        % Letter concatenation

        word=[word letter];

    end
    %fprintf(fid,'%s\n',lower(word));%Write 'word' in text file 
(lower)

    fprintf(fid,'%s\n',word);%Write 'word' in text file (upper)

    % Clear 'word' variable

    word=[ ];

    if isempty(re)  %See variable 're' in Fcn 'lines'

        break

    end

end

fclose(fid);

%Open 'text.txt' file

winopen('text.txt')

[Jan]

Please format the code to improve the readability.

Answer 1

[Jan]

WARNING OFF is a bad idea. Usually warnings should be avoided, not ignored.

CLEAR ALL is also a bad idea. It removes all parsed functions from the memory and reading the files again from the disk takes a lot of time. There is not benefit to use this. Nevertheless it appears in many files of beginners, such that I assume it is recommended in a textbook. In spite of this, it is not useful.

If I understand correctly, the problem is found in this line (and all other lines do not concern the problem at all):

letter = read_letter(img_r, num_letras);

This function replies a wrong character - correct? As long as we do not have any information about this function, it is impossible to suggest any improvements.

[Ahmed Mehar]

Jan Simon here is the function definition of read_letter........ function letter=read_letter(imagn,num_letras) global templates comp=[ ]; for n=1:num_letras sem=corr2(templates{1,n},imagn); comp = [comp sem]; end vd=find(comp==max(comp)); %*-*-*-*-*-*-*-*-*-*-*-*-*- if vd==1 letter='A'; elseif vd==2 letter='a'; elseif vd==3 letter='B'; elseif vd==4 letter='b'; elseif vd==5 letter='C'; elseif vd==6 letter='c'; elseif vd==7 letter='D'; elseif vd==8 letter='d'; elseif vd==9 letter='E'; elseif vd==10 letter='e'; elseif vd==11 letter='F'; elseif vd==12 letter='f'; elseif vd==13 letter='G'; elseif vd==14 letter='g'; elseif vd==15 letter='H'; elseif vd==16 letter='h'; elseif vd==17 letter='I'; elseif vd==18 letter='i'; elseif vd==19 letter='J'; elseif vd==20 letter='j'; elseif vd==21 letter='K'; elseif vd==22 letter='k'; elseif vd==23 letter='L'; elseif vd==24 letter='l'; elseif vd==25 letter='M'; elseif vd==26 letter='m'; elseif vd==27 letter='N'; elseif vd==28 letter='n'; elseif vd==29 letter='O'; elseif vd==30 letter='o'; elseif vd==31 letter='P'; elseif vd==32 letter='p'; elseif vd==33 letter='Q'; elseif vd==34 letter='q'; elseif vd==35 letter='R'; elseif vd==36 letter='r'; elseif vd==37 letter='S'; elseif vd==38 letter='s'; elseif vd==39 letter='T'; elseif vd==40 letter='t'; elseif vd==41 letter='U'; elseif vd==42 letter='u'; elseif vd==43 letter='V'; elseif vd==44 letter='v'; elseif vd==45 letter='W'; elseif vd==46 letter='w'; elseif vd==47 letter='X'; elseif vd==48 letter='x'; elseif vd==49 letter='Y'; elseif vd==50 letter='y'; elseif vd==51 letter='Z'; elseif vd==52 letter='z';

end

Answer 2

[roja m]

num_letras=size(templates,2); here why we have to take 2? if u know explaination of each line of program then plz esplain me.