MATLAB Answers

Pat
0

reading letters using OCR

Asked by Pat
on 15 Feb 2013

I have a image in want to read the letters,but those letters are not read it shows just one letter,plz tell how to read it using ocr

my inage

http://imgur.com/4hyFwWc

  5 Comments

my cropped portion of image

http://imgur.com/y63Dlu2,Gt8XDJG

Which is the original? The green one or the gray one?

the green one is original,i had converted to gray scale and processed it

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2 Answers

Answer by Walter Roberson
on 15 Feb 2013

Instead of converting to grayscale, threshold on the green channel.

  1 Comment

Walter i did as following even though text is not clear 
clc
clear all
close all
I=imread('elgi1.bmp');
imshow(I);
K=imcrop(I);
thresh=80;
Rchannel = K(:,:,1);
Gchannel = K(:,:,2);
Bchannel = K(:,:,3);
Map = Gchannel>thresh; 
figure,imshow(Map)
 u= bsxfun(@times,K,uint8(Map)); %apply map to whole image
 figure,imshow(u) 

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Answer by Image Analyst
on 15 Feb 2013

Those are very crude letters. It will probably take a pretty sophisticated OCR routine to recognize those. This MATLAB forum does not go into OCR much, except to refer you to the File Exchange or a web search. But you'll have trouble finding any OCR that can recognize those letters. You'd need substantial processing to turn them into something a lot more recognizable, and we just don't get into that kind of complicated algorithm development here. About all I could suggest is to use something like imclose() and bwmorph() to try to morph them into something that looks more like normal letters.

  1 Comment

MY code so far 
clc
clear all
close all
I=imread('elgi1.bmp');
imshow(I);
K=imcrop(I);
J=rgb2gray(K);
% bw = im2bw(J,graythresh(K))
bw=im2bw(J);
figure,imshow(bw)
se = strel('disk',5);
closeBW = imclose(bw,se);
figure, imshow(closeBW)
BW2 = bwmorph(closeBW,'thicken');
figure, imshow(BW2)
BW3 = bwmorph(BW2,'spur');
figure, imshow(BW3)
se1 = strel('square',8) 
closeBW1 = imclose(BW3 ,se1);
figure, imshow(closeBW1)

is there still more way ti read those letters as normal one,pleas eassist

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