ocr problem

jan this is the code for 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)
  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='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';
  else
      letter='0';
  end

Answer 1

[Naz]

Check out this similar problem. Instead of having so much else ifs, do a conversion of a number to string. That is, 'A' is a 65, so, you can say letter=num2str(sv+64). In this case, if sv=1, the sum is 65 and if you do number-to-string conversion you will get an 'A'. Notice, for numbers,if you can encode the '0' as vd==27 and '9' as vd==35, it will be easier to code.

[FIR]

Naz please look at this link

http://www.mathworks.in/matlabcentral/answers/19134-error-reading-special-character-using-ocr

where i have posted the questions for this problem

[tariq]

كيف يمكنني الكشف عن رقم لوحة السيارة في ocrالماتلاب عِنـديّ مشكلة بال

How can I find the car plate number in OCR Matlab? I have a problem

Answer 2

[Walter Roberson]

The long if/else chain can be replaced by:

transtab = ['A':'Z' '1':'9'];

if vd < 1 || vd > length(transtab)
  letter = '0';
else
  letter = transtab(vd);
end

[FIR]

walter ,yet my problem is not solved

[FIR]

walter can u answer to my question in this link

http://www.mathworks.com/matlabcentral/answers/19165-output-in-frequency-bands