I want to segment the characters from a page, which contain around more than 1500 characters. The problem is that while extracting the characters in different figures it becomes slowing down rapidly. It is little fast upto 50 to 60 characters.

Question

Y.L.K KHUMAN 2014-7-6

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/140568-i-want-to-segment-the-characters-from-a-page-which-contain-around-more-than-1500-characters-the-pr

评论： Image Analyst 2014-7-7

Here is the program:

 close all;
 clear all;
 clc;
 I=imread('book1-15.tif'); %%Read Image
 %figure(1)
 %imshow(I);
 %title('INPUT IMAGE WITH NOISE');
 if size(I,3)==3 % RGB image %%Convert to gray scale
    I=rgb2gray(I);
 end
 threshold = graythresh(I); %%Convert to binary image
 I =~im2bw(I,threshold);
 I = bwareaopen(I,60); %%Remove all object containing fewer than 1 pixels
 %figure(2) %%Show image binary image
 %imshow(~I);
 %title('INPUT IMAGE WITHOUT NOISE')
 Iedge=edge(uint8(I));  % EDGE DETECTION 
 %figure(3), imshow(Iedge);
 %title('EDGE ONLY')
 se=strel('square',1); % IMAGE DILATION
 Iedge2=imdilate(Iedge,se);
 %figure(4), imshow(Iedge2);
 %title('DILATED IMAGE')
 %ifill=imfill(Iedge2,'holes'); %IMAGE FILLING
 %g =imclearborder(ifill, 8);
 %figure(5), imshow(g);
 %title('FILLED IMAGE')
 seD = strel('diamond',1);               %IMAGE SMOOTHENING
 BWfinal = imerode(Iedge2,seD);              
 BWfinal = imerode(BWfinal,seD);
 BWoutline = bwperim(BWfinal);           % PRODUCING TRUE IMAGE
 Segout = I;
 Segout(BWoutline) = 255;
 %figure(5), imshow(Segout), title('outlined original image');
 [L, a,]=bwlabel(Segout);   %%Label connected components
 propied=regionprops(L,'BoundingBox');  %%Measure properties of image regions
 for n=1:size(propied,1)  %%Plot Bounding Box
    rectangle('Position',propied(n).BoundingBox,'EdgeColor','g','LineWidth',1);
 end
 for n=1:a   %%Objects extraction
    [r,c] = find(L==n);
    n1=Segout(min(r):max(r),min(c):max(c));
    figure, subimage(~n1);
   % pause(0.5)
    %imsave();
 end

Input Image:

In this program it segment very slowly. I want to segment it very fast.

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Answer 1

Image Analyst 2014-7-6

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https://ww2.mathworks.cn/matlabcentral/answers/140568-i-want-to-segment-the-characters-from-a-page-which-contain-around-more-than-1500-characters-the-pr#answer_143912

Perhaps try a method like this http://www.icsd.aegean.gr/lecturers/kavallieratou/publications_files/ICDAR2005.pdf, which someone else here was going to try. I have another one that was presented at Electronic imaging - maybe I'll try it on your image if I get time.

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Y.L.K KHUMAN 2014-7-7

So, is it drawback for MATLAB that took lots of time.?

Image Analyst 2014-7-7

Different algorithms take different lengths of time. Some of mine take a second or two. I've heard of others running simulations that take days. How long yours takes depends on what it's doing and how efficient you were at programming it up. I can't tell where one character stops and another starts in that language. You have to tell it. 25 minutes to find 577 characters does seem like a long time and there may be more efficient algorithms than whatever you did, so I referred you to papers where they do that kind of thing.

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