How to read image character with OCR?

Question

bee lebah 2022-6-21

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1744965-how-to-read-image-character-with-ocr

回答： bee lebah 2022-6-25

Hi can you help me please.

I have a problem with my program, my ocr program doesn't read letters, it reads only the number '1' which I think is coming from 'else' in file read.m.

And why does this one have a double result?

read.m

function letter=read(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='ha';
elseif vd==2
    letter='na';
elseif vd==3
    letter='ca';
elseif vd==4
    letter='ra';
elseif vd==5
    letter='ka';
elseif vd==6
    letter='da';
elseif vd==7
    letter='ta';
elseif vd==8
    letter='sa';
elseif vd==9
    letter='wa';
elseif vd==10
    letter='la';
elseif vd==11
    letter='pa';
elseif vd==12
    letter='dha';
elseif vd==13
    letter='ja';
elseif vd==14
    letter='ya';
elseif vd==15
    letter='nya';
elseif vd==16
    letter='ma';
elseif vd==17
    letter='ga';
elseif vd==18
    letter='ba';
elseif vd==19
    letter='tha';
elseif vd==20
    letter='nga';
elseif vd==21
    letter='hi';
elseif vd==22
    letter='ni';
elseif vd==23
    letter='ci';
elseif vd==24
    letter='ri';
elseif vd==25
    letter='ki';
elseif vd==26
    letter='di';
elseif vd==27
    letter='ti';
elseif vd==28
    letter='si';
elseif vd==29
    letter='wi';
elseif vd==30
    letter='li';
elseif vd==31
    letter='pi';
elseif vd==32
    letter='dhi';
elseif vd==33
    letter='ji';
elseif vd==34
    letter='yi';
elseif vd==35
    letter='nyi';
elseif vd==36
    letter='mi';
elseif vd==37
    letter='gi';
elseif vd==38
    letter='bi';
elseif vd==39
    letter='thi';
elseif vd==40
    letter='ngi';
elseif vd==41
    letter='hu';
elseif vd==42
    letter='nu';
elseif vd==43
    letter='cu';
elseif vd==44
    letter='ru';
elseif vd==45
    letter='ku';
elseif vd==46
    letter='du';
elseif vd==47
    letter='tu';
elseif vd==48
    letter='su';
elseif vd==49
    letter='wu';
elseif vd==50
    letter='lu';
elseif vd==51
    letter='pu';
elseif vd==52
    letter='dhu';
elseif vd==53
    letter='ju';
elseif vd==54
    letter='yu';
elseif vd==55
    letter='nyu';
elseif vd==56
    letter='mu';
elseif vd==57
    letter='gu';
elseif vd==58
    letter='bu';
elseif vd==59
    letter='thu';
elseif vd==60
    letter='ngu';
elseif vd==61
    letter='he';
elseif vd==62
    letter='ne';
elseif vd==63
    letter='ce';
elseif vd==64
    letter='re';
elseif vd==65
    letter='ke';
elseif vd==66
    letter='de';
elseif vd==67
    letter='te';
elseif vd==68
    letter='se';
elseif vd==69
    letter='we';
elseif vd==70
    letter='le';
elseif vd==71
    letter='pe';
elseif vd==72
    letter='dhe';
elseif vd==73
    letter='je';
elseif vd==74
    letter='ye';
elseif vd==75
    letter='nye';
elseif vd==76
    letter='me';
elseif vd==77
    letter='ge';
elseif vd==78
    letter='be';
elseif vd==79
    letter='the';
elseif vd==80
    letter='nge';
elseif vd==81
    letter='ho';
elseif vd==82
    letter='no';
elseif vd==83
    letter='co';
elseif vd==84
    letter='ro';
elseif vd==85
    letter='ko';
elseif vd==86
    letter='do';
elseif vd==87
    letter='to';
elseif vd==88
    letter='so';
elseif vd==89
    letter='wo';
elseif vd==90
    letter='lo';
elseif vd==91
    letter='po';
elseif vd==92
    letter='dho';
elseif vd==93
    letter='jo';
elseif vd==94
    letter='yo';
elseif vd==95
    letter='nyo';
elseif vd==96
    letter='mo';
elseif vd==97
    letter='go';
elseif vd==98
    letter='bo';
elseif vd==99
    letter='tho';
elseif vd==100
    letter='ngo';
else
    letter='1';
end

gui

% --- Executes on button press in buttonpilgam.
function buttonpilgam_Callback(hObject, eventdata, handles)
open=guidata(gcbo);
[filename, formatfile] = uigetfile ('*','BukaGambar');
im=imread(fullfile(formatfile, filename));
set(open.figure1,'CurrentAxes',open.axes1);
set(imagesc(im));
set(open.axes1,'Userdata',im);
%handles.im = im;
%guidata(hObject,handles);
%axes(handles.axes1);
%imshow(handles.im);
% hObject    handle to buttonpilgam (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% --- Executes on button press in button3proses.
function button3proses_Callback(hObject, eventdata, handles)
%Proses Grayscale
open=guidata(gcbo);
g=get(open.axes1,'Userdata');
if size(g,3)==3
    g=rgb2gray(g);
end
set(open.figure1,'CurrentAxes',open.axes2);
set(imshow(g));
set(open.figure1,'Userdata',g);
set(open.axes2,'Userdata',g);
%Proses Grayscale to Threeshold
%open=guidata(gcbo);
%g=get(open.axes2,'Userdata');
%if size(g,3)==3
%    g=im2bw(g);
%end
%set(open.figure1,'CurrentAxes',open.axes3);
%set(imshow(g));
%set(open.figure1,'Userdata',g);
%set(open.axes3,'Userdata',g);
%Proses Threshold to Biner
open=guidata(gcbo);
g=get(open.axes2,'Userdata');
threshold = graythresh(g);
g=~im2bw(g,threshold);
g2=g;
set(open.figure1,'CurrentAxes',open.axes4);
set(imshow(g2));
g=bwareaopen(g,50);
set(open.figure1,'Userdata',g);
set(open.axes4,'Userdata',g);
%Proses OCR
word=[ ];
text=[ ];
re=g;
load templates
global templates
num_letras=size(templates,2);
while 1
   
    [fl re]=lines(re);
    imgn=fl;
    n=0;
    spacevector = [];
    rc = fl;
    
    while 1
        %[fc rc space]=letter_crop(rc);
        %while 1
        %Fcn 'letter_crop' separate letters in a line
       [fc rc space]=letter_crop(rc);  %fc =  first letter in the line
                                       %rc =  remaining cropped line
                                       %space = space between the letter
                                       %   cropped and the next letter
       %uncomment below line to see letters one by one
       %figure,imshow(fc);pause(0.5)
       img_r = imresize(fc,[42 24]);   %resize letter so that correlation
                                       %can be performed
       n = n + 1;
       spacevector(n)=space;
       
       %Fcn 'read_letter' correlates the cropped letter with the images
       %given in the folder 'letters_numbers'
       letter = read(img_r,num_letras);
       
       %letter concatenation
       word = [word letter];
       
       if isempty(rc)  %breaks loop when there are no more characters
           break;
       end
     end
    
        max_space = max(spacevector);
        no_spaces = 0;
         for x= 1:n   %loop to introduce space at requisite locations
           if spacevector(x+no_spaces)> (0.75 * max_space)
              no_spaces = no_spaces + 1;
                for m = x:n
                  word(n+x-m+no_spaces)=word(n+x-m+no_spaces-1);
                end
               word(x+no_spaces) = ' ';
               spacevector = [0 spacevector];
           end
         end
    %-----------------------------------------------------------------
    % 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,[90 90]);
        %-------------------------------------------------------------------
        % Call fcn to convert image to text
    %    letter=read(img_r,num_letras);
        % Letter concatenation
    %    max_space = max(spacevector);
    %    no_spaces = 0;
    %     for x= 1:n   %loop to introduce space at requisite locations
    %       if spacevector(x+no_spaces)> (1 * max_space)
    %          no_spaces = no_spaces + 1;
    %            for m = x:n
    %              word(n+x-m+no_spaces)=word(n+x-m+no_spaces-1);
    %            end
    %           word(x+no_spaces) = ' ';
    %           spacevector = [0 spacevector];
    %       end
    %     end
    %    word=[word letter];
    %end
    text = char(text, word);
    % Clear 'word' variable
    %fprintf(text,'%s\n',word);
    word=[ ];
    %*When the sentences finish, breaks the loop
    if isempty(re)  %See variable 're' in Fcn 'lines'
        break
    end
end
set(handles.figure1,'Visible','on');
set(handles.text8hslteks,'String',[text]);
set(handles.text8hslteks,'FontSize',10);
guidata(hObject, handles);
%cropping
% hObject    handle to button3proses (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)