1 简介
图像分 割技 术在计 算机视 觉 、模 式识别 、医学图像处理等领 域应 用十分广 泛 ，其主要 目的是从一 幅图像 中提取感兴趣 的目标，它是图像分析和图像理解的基础。至今，提出的分割算法 已有上千种 ，其 中最经典 的方法就是基 于灰度 阈值 的分割方法 。在 图像 阈值 化分割计 算 中 ，Otsu法… 因计算 简单 、实时性高等优点被广泛使用。但是 ，一维 Otsu方法只考虑 了图像灰度信 息 ，对噪声较为敏 感 ，抗噪性较 弱 。为解决传统二维 Otsu算法在含噪声较多的图像应用中分割效果较差这一问题 ，本文提出一种基于中值滤波的二维 Otsu图像分割算法 。该算法充分将中值滤波和二维Otsu算法结合起来 ，弥补 了二维 Otsu算法去噪性能的不足 。本文首先利用 自适应 加权中值滤波对噪声图像进行滤波处理；然后再将滤波后的中值图像的二维直方图区域划分由原来 的四分法改为二分法 ，充分考虑了二维直方 图内的每一
个像素点的信息，利用改进的二维 Otsu算法对图像作精确分割 ，计算复杂度 降低，提高了算法的实用性。
考虑 N维 Otsu算法在含噪声较多的图像应用中分割效果较差这一问题 ，本文首先提出一种中值 滤波 ，然后使用该滤波对噪声图像进行滤波处理 。该滤波算法包括三个过程 ：
a)对噪声图像进行噪声检测 ；
b)依据窗口中噪声点的个数来确定滤波窗口的大小 ；
C)利用中值滤波对噪声图像进行滤波。
2 部分代码
function varargout = experiment3(varargin)% EXPERIMENT3 MATLAB code for experiment3.fig% EXPERIMENT3, by itself, creates a new EXPERIMENT3 or raises the existing% singleton*.%% H = EXPERIMENT3 returns the handle to a new EXPERIMENT3 or the handle to% the existing singleton*.%% EXPERIMENT3('CALLBACK',hObject,eventData,handles,...) calls the local% function named CALLBACK in EXPERIMENT3.M with the given input arguments.%% EXPERIMENT3('Property','Value',...) creates a new EXPERIMENT3 or raises the% existing singleton*. Starting from the left, property value pairs are% applied to the GUI before experiment3_OpeningFcn gets called. An% unrecognized property name or invalid value makes property application% stop. All inputs are passed to experiment3_OpeningFcn via varargin.%% *See GUI Options on GUIDE's Tools menu. Choose "GUI allows only one% instance to run (singleton)".%% See also: GUIDE, GUIDATA, GUIHANDLES% Edit the above text to modify the response to help experiment3% Last Modified by GUIDE v2.5 31-May-2018 16:55:57% Begin initialization code - DO NOT EDITgui_Singleton = 1;gui_State = struct('gui_Name', mfilename, ... 'gui_Singleton', gui_Singleton, ... 'gui_OpeningFcn', @experiment3_OpeningFcn, ... 'gui_OutputFcn', @experiment3_OutputFcn, ... 'gui_LayoutFcn', [] , ... 'gui_Callback', []);if nargin && ischar(varargin{1}) gui_State.gui_Callback = str2func(varargin{1});endif nargout [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});else gui_mainfcn(gui_State, varargin{:});end% End initialization code - DO NOT EDIT% --- Executes just before experiment3 is made visible.function experiment3_OpeningFcn(hObject, eventdata, handles, varargin)% This function has no output args, see OutputFcn.% hObject handle to figure% eventdata reserved - to be defined in a future version of MATLAB% handles structure with handles and user data (see GUIDATA)% varargin command line arguments to experiment3 (see VARARGIN)% Choose default command line output for experiment3handles.output = hObject;% Update handles structureguidata(hObject, handles);% UIWAIT makes experiment3 wait for user response (see UIRESUME)% uiwait(handles.figure1);% --- Outputs from this function are returned to the command line.function varargout = experiment3_OutputFcn(hObject, eventdata, handles) % varargout cell array for returning output args (see VARARGOUT);% hObject handle to figure% eventdata reserved - to be defined in a future version of MATLAB% handles structure with handles and user data (see GUIDATA)% Get default command line output from handles structurevarargout{1} = handles.output;function edit1_Callback(hObject, eventdata, handles)% hObject handle to edit1 (see GCBO)% eventdata reserved - to be defined in a future version of MATLAB% handles structure with handles and user data (see GUIDATA)% Hints: get(hObject,'String') returns contents of edit1 as text% str2double(get(hObject,'String')) returns contents of edit1 as a double% --- Executes during object creation, after setting all properties.function edit1_CreateFcn(hObject, eventdata, handles)% hObject handle to edit1 (see GCBO)% eventdata reserved - to be defined in a future version of MATLAB% handles empty - handles not created until after all CreateFcns called% Hint: edit controls usually have a white background on Windows.% See ISPC and COMPUTER.if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor')) set(hObject,'BackgroundColor','white');end% --- Executes on button press in pushbutton1.function pushbutton1_Callback(hObject, eventdata, handles)% hObject handle to pushbutton1 (see GCBO)% eventdata reserved - to be defined in a future version of MATLAB% handles structure with handles and user data (see GUIDATA)shiyan3 = rgb2gray(imread('shiyan3.bmp'));size_filter_m = str2double(get(handles.edit1,'string'));size_filter_n = str2double(get(handles.edit2,'string'));if isnan(size_filter_m) size_filter_m = 3;endif isnan(size_filter_n) size_filter_n = 3;function edit2_Callback(hObject, eventdata, handles)% hObject handle to edit2 (see GCBO)% eventdata reserved - to be defined in a future version of MATLAB% handles structure with handles and user data (see GUIDATA)% Hints: get(hObject,'String') returns contents of edit2 as text% str2double(get(hObject,'String')) returns contents of edit2 as a double% --- Executes during object creation, after setting all properties.function edit2_CreateFcn(hObject, eventdata, handles)% hObject handle to edit2 (see GCBO)% eventdata reserved - to be defined in a future version of MATLAB% handles empty - handles not created until after all CreateFcns called% Hint: edit controls usually have a white background on Windows.% See ISPC and COMPUTER.if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor')) set(hObject,'BackgroundColor','white');end
3 仿真结果
4 参考文献
[1]倪麟, 龚劬, 曹莉,等. 基于自适应加权中值滤波的二维Otsu图像分割算法[J]. 计算机应用研究, 2013, 30(2):3.
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部分理论引用网络文献，若有侵权联系博主删除。
