Procesamiento de imágenes básico en general

En este apartado os muestro un vídeo donde realizo procesamiento de imágenes para poder cambiar el tipo de imagen en función de sus colores, añadiéndole ruido  y filtrándola:


Como os comento en el vídeo os explico mas detalladamente el filtro de mediana:
si tenemos 9 píxeles en 3 filas y 3 columnas, y el pixel del medio es el que tiene un valor muy diferente a los demás, se le asigna el valor de la mediana, es decir, ordenamos los 9 valores en orden ascendente y se coge el valor del quinto como el valor que se le asigna al pixel diferente.

Interfáz gráfica 

Programa con archivos .m e imágenes:

http://www.mediafire.com/download/se0jts0cka5i6k4/Interfaz_con_los_filtros_a_aplicar_a_una_imagen.rar

Código(no es un archivo .m, sino que es una interfaz(GUI)):

function varargout = Interfazfiltros2(varargin)
% INTERFAZFILTROS2 MATLAB code for Interfazfiltros2.fig
%      INTERFAZFILTROS2, by itself, creates a new INTERFAZFILTROS2 or raises the existing
%      singleton*.
%
%      H = INTERFAZFILTROS2 returns the handle to a new INTERFAZFILTROS2 or the handle to
%      the existing singleton*.
%
%      INTERFAZFILTROS2('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in INTERFAZFILTROS2.M with the given input arguments.
%
%      INTERFAZFILTROS2('Property','Value',...) creates a new INTERFAZFILTROS2 or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before Interfazfiltros2_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to Interfazfiltros2_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 Interfazfiltros2

% Last Modified by GUIDE v2.5 03-Mar-2014 23:13:31

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @Interfazfiltros2_OpeningFcn, ...
                   'gui_OutputFcn',  @Interfazfiltros2_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 Interfazfiltros2 is made visible.
function Interfazfiltros2_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 Interfazfiltros2 (see VARARGIN)

% Choose default command line output for Interfazfiltros2
handles.output = hObject;
handles.myImage = [];
% Update handles structure
guidata(hObject, handles);

% UIWAIT makes Interfazfiltros2 wait for user response (see UIRESUME)
% uiwait(handles.figure1);


% --- Outputs from this function are returned to the command line.
function varargout = Interfazfiltros2_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 structure
varargout{1} = handles.output;


% --- Executes on button press in cargarimagen.
function cargarimagen_Callback(hObject, eventdata, handles)
% hObject    handle to cargarimagen (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
    handles.myImage = imread('pinguinos.jpg');
    image(handles.myImage, 'Parent', handles.axes1);

    guidata(hObject, handles);


% --- Executes on selection change in menu1.
function menu1_Callback(hObject, eventdata, handles)
% hObject    handle to menu1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: contents = cellstr(get(hObject,'String')) returns menu1 contents as cell array
%        contents{get(hObject,'Value')} returns selected item from menu1
guidata(hObject, handles);
v=get(handles.menu1,'value');
switch v
    case 1
        imshow(handles.myImage, 'Parent', handles.axes2);
    case 2
        imshow(handles.myImage, 'Parent', handles.axes2);
    case 3
        image4=handles.myImage;
        image41(:,:,1)=image4(:,:,1);
        image41(:,:,2)=0;
        image41(:,:,3)=0;
        image(image41, 'Parent', handles.axes2);
    case 4
        image5=handles.myImage;
        image51(:,:,2)=image5(:,:,2);
        image51(:,:,1)=0;      
        image51(:,:,3)=0;
        image(image51, 'Parent', handles.axes2);
    case 5
        image6=handles.myImage;
        image61(:,:,3)=image6(:,:,3);
        image61(:,:,1)=0;
        image61(:,:,2)=0;       
        image(image61, 'Parent', handles.axes2);

    case 6  
        imagebw=im2bw(handles.myImage,0.5);
        imshow(imagebw, 'Parent', handles.axes2);
       
    case 7       
        im_gray=rgb2gray(handles.myImage);
        imshow(im_gray, 'Parent', handles.axes2);
    case 8
        im_gray2=rgb2gray(handles.myImage);
        im_edge=edge(im_gray2,'sobel');
        imshow(im_edge, 'Parent', handles.axes2);
    case 9
        im_gray3=imnoise(handles.myImage, 'salt & pepper');
        imshow(im_gray3, 'Parent', handles.axes2);
    otherwise
        im_gray4=rgb2gray(handles.myImage);
        im_gray5=imnoise(im_gray4, 'salt & pepper');
        imshow(im_gray5, 'Parent', handles.axes2); 
end

% --- Executes during object creation, after setting all properties.
function menu1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to menu1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: popupmenu 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 selection change in menu2.
function menu2_Callback(hObject, eventdata, handles)
% hObject    handle to menu2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: contents = cellstr(get(hObject,'String')) returns menu2 contents as cell array
%        contents{get(hObject,'Value')} returns selected item from menu2
guidata(hObject, handles);
v=get(handles.menu2,'value');
        im_gray7=rgb2gray(handles.myImage);
        im_gray8=imnoise(im_gray7, 'salt & pepper');
       
switch v
    case 1
        imshow(im_gray8, 'Parent', handles.axes4);
    case 2
        im_filt=medfilt2(im_gray8);
        imshow(im_filt, 'Parent', handles.axes4);
    case 3
        filtro=1/9*[1 1 1;1 1 1;1 1 1];
        filtro_suavizado=filter2(filtro,double(im_gray8));
        image(filtro_suavizado, 'Parent', handles.axes4);
    case 4
        [a b]=imhist(im_gray8);
        stem(b,a, 'Parent', handles.axes4)
    case 5 
        %como hay nivel de gris desde el 0 hasta el 255 no se puede aplicar
        %ecualizacion
        imshow(im_gray8, 'Parent', handles.axes4);  
    otherwise
        im_filt2=medfilt2(im_gray8);
        filtro3=1/9*[1 1 1;1 1 1;1 1 1];
        filtro_suavizado2=filter2(filtro3,double(im_filt2));
        image(filtro_suavizado2, 'Parent', handles.axes4);
       
end


% --- Executes during object creation, after setting all properties.
function menu2_CreateFcn(hObject, eventdata, handles)
% hObject    handle to menu2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: popupmenu 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 

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