I want to segment the word which is between the black color . i could'd by this code help please.

Question

Y.L.K KHUMAN 2014-5-22

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https://ww2.mathworks.cn/matlabcentral/answers/130691-i-want-to-segment-the-word-which-is-between-the-black-color-i-could-d-by-this-code-help-please

关闭： MATLAB Answer Bot 2021-8-20

 close all;
 clear all;
 clc;
 im=imread('Segmented_line1.jpg');%read the image
 figure, imshow(im);
 bw=im2bw(im);%convert the image im into binary(black and white)
 a=~bw;
 figure, imshow(a);
 b=sum(a,1);
 % Measure lengths of all "0" regions.
 measurements = regionprops(b == 0, 'Area', 'PixelIdxList');
 % Get indexes of those regions that are >= 20 in length.
 fiveLongRegions = find([measurements.Area] >= 20);
 theIndexes = vertcat(measurements(fiveLongRegions).PixelIdxList);
 c=a;
 c(:,theIndexes)=1;
 figure, imshow(c);
 e=~c;
 figure, imshow(e);
 [x,y]=size(e);
 mat1=sum(e,1);
 mat2=x-mat1;%subtract each element of the sum matrix(mat1) from the width length(no. of columns)
mat3=mat2~=0;
mat4=diff(mat3);
index1=find(mat4);
[q,w]=size(index1);%size of index2 matrix is q*w
kap=1;
lam=1;
iii=1;
ii=1;
while kap<((q/2)+1);%number of loops=number of lines
    k=1;
    mat5=([]);
    for j=(index1(lam)+1):1:index1(lam+1)
    mat5(k,:)=e(j,:); %store the line segmented matrix
            k=k+1;
    end
            mat6=sum(mat5,2); %sum the elements of the line segmented matrix columnwise
            mat7=(index1(lam+1)-index1(lam))-mat6; %subtract each element of the sum matrix(mat6) from the height length(no. of rows)
            mat8=mat7~=0;
            mat9=diff(mat8);
            index2=find(mat9);
            [z,r]=size(index2);
              nm=rectangle('position',[index1(1)+1,index1(iii),index2(r)-index2(1),index1(iii+1)-index1(iii)+1]);
                set(nm,'edgecolor','r')
            lam=lam+2;   
        kap=kap+1;
        iii=iii+2;
        file_name=sprintf('Segmented_line%d.jpg',ii);
        imwrite(mat5,file_name,'tif');
        ii=ii+1;
end

input image:

segmented by black pixel:

i want to save words which are segmented by the black pixels.

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Answer 1

Image Analyst 2014-5-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/130691-i-want-to-segment-the-word-which-is-between-the-black-color-i-could-d-by-this-code-help-please#answer_137972

See my Image Segmentation Tutorial: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862. It does that. All you have to do is to change the sign of the threshold to segment black regions instead of bright regions, and change the filename of course.