How to Segment the characters from left to right

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

[sayar chit]

@Rutika Titre!

Can you give me character segmentation. My mail is [e-mail]. Thank you in advance.

Answer 1

[Walter Roberson]

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

[Rutika Titre]

Thank You Sir, I actually did not understand exactly "objects Extraction".

[Rutika Titre]

Sir Please help me I am not getting the error how to segment from left to right . I mean I am not understanding .How to sort them by x coordinate

[Walter Roberson]

bounds = vertcat(propied.BoundingBox);
[~, sortorder] = sort(bounds, 'rows');
propied = propied(sortorder);

Now propied has been put into order, left-most first. In cases of ties, the top-most one will appear first.

Note: the 'v' of 'every' on the second line starts to the left of the 'o' of the 'Some' of the first line, so the order will be 'S' (first line) 'e' (second line) 'v' (second line) 'o' (first line). That is because you asked for left to right, not line by line.

[Rutika Titre]

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]

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.

Answer 2

[Reshma Viswambharan]

How can i do line by line segmentation? plz tell me which code i used for this and how i eliminate logos in number plate. plz help me...

[Rutika Titre]

Hi Reshma, This is the link http://www.mathworks.com/matlabcentral/answers/112857-how-to-automatically-identify-text-lines-from-projection-plot. I hope this helps you in line segmentation. Try this.