How to Segment the characters from left to right

Question

Rutika Titre 2016-1-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/262399-how-to-segment-the-characters-from-left-to-right

评论： sayar chit 2017-11-14

Hello Sir,

I am segmenting line of text and then want to segment individual characters from left to right. In my code after applying bounding box of each character the character are not reading from left to right and even I want to display the output that the input text was what ever I give the input image.Thank you in advance.

%%Read Image
imagen=imread('2.png');
%%space
sp=10;
%%Show image
figure(1)
imshow(imagen);
title('INPUT IMAGE WITH NOISE')
%%Convert to gray scale
if size(imagen,3)==3 % RGB image
    imagen=rgb2gray(imagen);
end
%%Convert to binary image
threshold = graythresh(imagen);
imagen =~im2bw(imagen,threshold);
%imagen = imclose(imagen, strel('rectangle',[3 ceil(Sp/2)]));
%%Remove all object containing fewer than 30 pixels
imagen = bwareaopen(imagen,15);
pause(1)
%%Show image binary image
figure(2)
imshow(~imagen);
title('INPUT IMAGE WITHOUT NOISE')
%%Label connected components
[L Ne]=bwlabel(imagen);
%%Measure properties of image regions
propied=regionprops(L,'BoundingBox');
hold on
%%Plot Bounding Box
for n=1:size(propied,1)
    rectangle('Position',propied(n).BoundingBox,'EdgeColor','g','LineWidth',2)
end
hold off
pause (1)
%%Objects extraction
figure
for n=1:Ne
    [r,c] = find(L==n);
    n1=imagen(min(r):max(r),min(c):max(c));
    imshow(~n1);
    pause(0.5)
      end

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sayar chit 2017-11-14

@Rutika Titre!

Can you give me character segmentation. My mail is chitsanlwin.maths.mm@gmail.com. Thank you in advance.

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Answer 1

Walter Roberson 2016-1-2

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https://ww2.mathworks.cn/matlabcentral/answers/262399-how-to-segment-the-characters-from-left-to-right#answer_204842

You have the bounding boxes. Sort them by x coordinate.

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Rutika Titre 2016-1-2

Error using sort sorting direction must be 'ascend' or 'descend'.

Error in objectextrac (line 47) [~, sortorder] = sort(bounds, 'rows');

Sir, I m getting this error.It should segment each character as we read. First line all characters from left to right and then second line from left to right. Thanking You!

Walter Roberson 2016-1-2

在 MATLAB Online 中打开

As the correction to the above,

bounds = vertcat(propied.BoundingBox);
[~, sortorder] = sortrows(bounds);
propied = propied(sortorder);

However this does not sort by line. To do that you need to figure out where the line boundaries are and proceed a line at a time sorting by the bounding box. You could consider horizontal profiling to find the line bounds.

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