oversegmentation of printed arabic writing

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yamina jafri
yamina jafri 2017-4-13
评论： Tehmina Kakar 2018-7-14
Hello, Iam work in Matlab Arabic OCR.. in the segmentation phase, i segmente word to characters using Vertical projection method but it's suffer from over segmentation problem in some characters! any suggest of how can i solve this problem please help!
% // Original Code of Vertical Projection for Segmentation by Ana Ainul S.
%//last modofication by yamina_os
y =1;
a = imread ('text9.png');
myFolder = 'C:\Users\Aicha\Desktop\images';
%%Binarization %%
level = graythresh (a);
b = im2bw (a, level);
%%Complement %%
c = imcomplement (b);
% se = strel ('square', 1);
% c = imclose(com, se);
%%PadArray %%
i=padarray(c,[0 10]);
%%Vertical Projecttion for Character Segmentation
verticalProjection = sum(i, 1);
set(gcf, 'Name', 'Segmentation Trial', 'NumberTitle', 'Off')
subplot(2,2,1);imshow(i);
subplot(2,2,3);
plot(verticalProjection, 'b-');
grid on;
% *Defining the threshold to determine baseline area* %
threshold=max(verticalProjection)/3;
% threshold = 0;
% threshold=min(verticalProjection)/3;
% threshold = 5; % Threshold >0 used to detect the baseline of cursive characters
thresholdedProjection=verticalProjection > threshold;
count=0;
startingColumns = [];
startingColumnsIndex=0;
for j =1:length(thresholdedProjection)
if thresholdedProjection(j)
if(count>0)
startingColumnsIndex=startingColumnsIndex+1;
startingColumns(startingColumnsIndex)= j-floor(count/2);
count=0;
end
else
count=count+1;
end
end
endingColumns=[startingColumns(2:end)-1 j-floor(count/2)];
y=1;
% *Extract each region, result of segmentation process*
for k = 1 : length(startingColumns)
% Get sub image of just one character
subImage = i(:, startingColumns(k):endingColumns(k));
% im = subImage;
s = subImage;
p = bwmorph(s,'thin',Inf);
% Normalization using algorithm 2%
% p = normalization2 (t);
subplot(2,2,2);
imagesc (p);
axis equal off;
pause (0.5);
% figure,
imshow (p);
% Morphological Operation - Thinning %
% t = bwmorph(p,'thin',Inf);
n =1;
z=1
for n = 1 : length (z)
formatSpec = 'data.%d.%d.png';
baseFileName = sprintf(formatSpec, z, k);
fullFileName = fullfile(myFolder, baseFileName);
% Do the write to disk.
imwrite(p, fullFileName);
end
end

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