%%初始部分，讀取圖像及計算相關信息


clear;
close all;
clc;

%format long;
t0=clock;
I=imread('Lenna.bmp');

%threshold_opt=graythresh(I);

I1=im2bw(I,98/25);

figure(1);
imshow(I);
title('源圖');

figure(2);
imshow(I1);
%title('閾值分割后的圖像');
threshold_opt*255

t1=clock;
search_time=etime(t1,t0);
search_time