After finding the threshold, how can i redraw the histogram and the image using the new thresold value

This is the code to find the thresold

clc; clear all; close all;

i= imread('cameraman.jpg'); [m,n]=size(i); figure, imshow(i);

[rows, columns, numberOfColorBands] = size(i)

if numberOfColorBands > 1 i = i(:, :, 2); % Take green channel. end

 [y x]=imhist(i)

 figure(2), imhist(i);

 p=y/(m*n);

t=100;

while true

    disp(t);

    m1=(x>t);

    u1= sum(x(m1).*p(m1))/sum(p(m1));

    m2=(x<=t);

    u2= sum(x(m2).*p(m2))/sum(p(m2));

    tnew=(u1+u2)/2;

    if t==tnew
        break;
    else
        t=tnew;
    end 
end

After finding the threshold, how can i redraw the histogram and also the cameraman image by using the new threshold value.

can anyone help me in this.

Thank you