error in reading special characters

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FIR 2011-10-21

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https://ww2.mathworks.cn/matlabcentral/answers/18965-error-in-reading-special-characters

i am reading a text using ocr but in that i have some special characters ,my ocr doest not recognise that character,can u suggest any idea

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Answer 1

Walter Roberson 2011-10-21

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https://ww2.mathworks.cn/matlabcentral/answers/18965-error-in-reading-special-characters#answer_25367

Either you have a bug in your OCR routine, or your OCR routine is not powerful enough to handle those characters (perhaps you have not trained it enough on those characters?)

In past postings you have described this as a problem with Notepad, as if your OCR is working correctly but writing to Notepad gets you something different. That possibility seems a bit unlikely. Have you tracked the decimal (or hex) value of the characters your OCR routine claims to find, and then in a different program tried writing exactly that pattern to Notepad to see what happens? Is your OCR routine coming up with characters that need more than 8 bits to store internally? For that matter, coming up with characters greater than 127 so that character sets and fonts start being an issue?

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Walter Roberson 2011-10-22

"refers"? I don't understand that. References, perhaps?

"cods" I am guessing is "codes".

I am not sure what you are asking, but possibly you are asking for a reference to which characters are capable of being represented within the MATLAB "char" data type. If so, you can see a pretty complete list at http://www.ssec.wisc.edu/~tomw/java/unicode.html

Everything you see in that chart can be stored as a single MATLAB "char", *including* even the sets such as Tibetan, Cherokee, and Arabic.

However! You need the appropriate font(s) to read most of those characters. And you need two bytes to represent anything beyond Basic Latin if you are using the UTF-8 encoding scheme, and you need three or more bytes to represent anything beyond the Thaana alphabet if you are using the UTF-8 encoding scheme or are using one of the UTF-16 encoding schemes.

Generally speaking, if you are writing out characters beyond Basic Latin (0-127) that you expect another program to be able to read, then you need to take care to encode the data properly as you write it, which might require calls to unicode2native() or native2unicode(). For a discussion of that process, see http://www.mathworks.com/matlabcentral/answers/6347-arabic-document

Still, based upon the examples you had posted earlier, the impression people would have gotten was that your OCR was recognizing and emitting characters that were purely in the Basic Latin subset (0-127), and saving such characters normally takes no special treatment at all. There do, though, appear to be some applications (including some Microsoft applications) that seem to assume that everything is encoded in one of the UTF-16 encodings (and sometimes don't even include a Byte Order Mark!): if you ran into one of those rogue programs then you would certainly need to take special care to arrange your input according to the non-standard requirements of that particular program.

FIR 2011-10-22

% PRINCIPAL PROGRAM

warning off %#ok<WNOFF>

% Clear all

clc, close all, clear all

% Read image

imagen=imread('image.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

fclose(fid);

%Open 'text.txt' file

winopen('text.txt')

sample image is http://imgur.com/Ajmsi

FIR 2011-10-22

http://imgur.com/YHYFD and for this image also in need to extract score

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error in reading special characters

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error in reading special characters

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