How to Improve Image binarization and segmentation?

Question

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original.jpg

Dear all,

I am doing image segmentation. But my reseult include some unwated areas.

Could anyone help me to improve it ? or any ideal to remove it

Thanks

Han

This is my code.

Original_image = rgb2gray(imread('original.jpg'));
[rows, columns] = size(Original_image);
leftHalf = Original_image(:, 1:floor(columns/1.3));
rightHalf = Original_image(:, floor(columns/1.3)+1 : end);
imwrite(leftHalf,'2_.png')
%Pre thresholding
warning off;
x=leftHalf
imshow(x);
title('Original Grayscale Image');
figure;
x=im2double(x);
d=im2bw(x);
imshow(d);
imwrite(d,'2_mask1.png');