[image defogging] image defogging based on dark channel and non-mean filtering with matlab code

1 Content introduction

Fog is actually an aerosol composed of tiny droplets of suspended particles in the atmosphere , Often milky white , Its bottom lies on the earth's surface , So it can also be seen as a cloud close to the ground . Mist is not much different from fog , One explanation for it is light fog , Mostly grayish white , Very close to the color of fog . Fog in a broad sense includes fog 、 Haze 、 Sand dust 、 Smoke and other physical phenomena that limit visual effects . Due to the existence of fog , Outdoor image quality is reduced , If you don't deal with , Often can not meet the relevant research 、 Application requirements . Under the influence of fog , Light passing through the surface of an object is absorbed and reflected by particles in the atmosphere , Resulting in poor image quality , The details are vague 、 The color is dim .

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2 Simulation code

 function varargout = txrh(varargin)% TXRH MATLAB code for txrh.fig%      TXRH, by itself, creates a new TXRH or raises the existing%      singleton*.%%      H = TXRH returns the handle to a new TXRH or the handle to%      the existing singleton*.%%      TXRH('CALLBACK',hObject,eventData,handles,...) calls the local%      function named CALLBACK in TXRH.M with the given input arguments.%%      TXRH('Property','Value',...) creates a new TXRH or raises the%      existing singleton*.  Starting from the left, property value pairs are%      applied to the GUI before txrh_OpeningFcn gets called.  An%      unrecognized property name or invalid value makes property application%      stop.  All inputs are passed to txrh_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 txrh% Last Modified by GUIDE v2.5 22-Apr-2019 21:49:06% Begin initialization code - DO NOT EDITgui_Singleton = 1;gui_State = struct('gui_Name',       mfilename, ...    'gui_Singleton',  gui_Singleton, ...    'gui_OpeningFcn', @txrh_OpeningFcn, ...    'gui_OutputFcn',  @txrh_OutputFcn, ...    'gui_LayoutFcn',  [] , ...    'gui_Callback',   []);if nargin && ischar(varargin{1})    gui_State.gui_Callback = str2func(varargin{1});end​if 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 txrh is made visible.function txrh_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 txrh (see VARARGIN)% Choose default command line output for txrhhandles.output = hObject;% Update handles structureguidata(hObject, handles);% UIWAIT makes txrh wait for user response (see UIRESUME)% uiwait(handles.figure1);​% --- Outputs from this function are returned to the command line.function varargout = txrh_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;​% --- 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)​​​​​​global I[filename,pathname]=uigetfile({'*.bmp;*.tif;*.png','(*.bmp;*.jpg;*.gif;*.tif)';'*.bmp','(*.bmp)';'*.jpg','(*.tif)';'*.gif','(*.tif)';},' Open the picture ');if isequal(filename,0)||isequal(pathname,0)%§ì    return;else    I=imread([pathname,filename]);end% [m,n,l]=size(I1);% Read the picture 1 Show % if l==3%     I1=rgb2gray(I1);% endaxes(handles.axes1)imshow(I)title(' Original picture ')% --- Executes on button press in pushbutton2.% --- Executes on button press in pushbutton3.function pushbutton3_Callback(hObject, eventdata, handles)% hObject    handle to pushbutton3 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)global I ;​% %matlab 2014a% clc;% clear all;% [filename,pathname]=uigetfile({'*.jpg;*.bmp;*.tif;*.png;*.gif','All Image Files';'*.*','All Files'});  % I = imread([pathname,filename]);% Read image % % figure;% set(gcf,'outerposition',get(0,'screensize'));% imshow(I);xlabel(' original image ');[h,w,s]=size(I);min_I=zeros(h,w);           %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Get dark channel image for i=1:h                     for j=1:w        dark_I(i,j)=min(I(i,j,:));    endendfigure;imshow(dark_I);xlabel(' Dark channel image ');%imwrite(dark_I,'dark_I.jpg');Max_dark_channel=double(max(max(dark_I)))  % Sky brightness dark_channel=double(0.9*dark_I);%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Nonlocal mean filtering % Parameters  T=5;h=6.5;t=3;f=1;for t=1:TI0=NLmeans(dark_channel,t,f,h);endfigure; imshow(uint8(I0));xlabel(' Non mean filtered image ')%​​function edit10_Callback(hObject, eventdata, handles)% hObject    handle to edit10 (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 edit10 as text%        str2double(get(hObject,'String')) returns contents of edit10 as a double​% --- Executes during object creation, after setting all properties.function edit10_CreateFcn(hObject, eventdata, handles)% hObject    handle to edit10 (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 Running results

4 reference

[1] Yuan Kai , Wang xiaofeng . An image defogging algorithm combining dark channel and color decay a priori [J]. Modern computers , 2018, No.622(22):36-41.

[2] Wang Hongyu et al . " Image defogging method and system based on dark channel and nonlocal prior .", 2019.

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