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一、简介

如何在视频流中检测到人脸以及人脸追踪。对象检测和跟踪在许多计算机视觉应用中都很重要，包括活动识别，汽车安全和监视。所以这篇主要总结MATLAB的人脸检测和跟踪。
首先看一下流程。检测人脸——>面部特征提取——>脸部追踪。

二、源代码

unction varargout = facedetecion(varargin)% FACEDETECION MATLAB code for facedetecion.fig%      FACEDETECION, by itself, creates a new FACEDETECION or raises the existing%      singleton*.%%      H = FACEDETECION returns the handle to a new FACEDETECION or the handle to%      the existing singleton*.%%      FACEDETECION('CALLBACK',hObject,eventData,handles,...) calls the local%      function named CALLBACK in FACEDETECION.M with the given input arguments.%%      FACEDETECION('Property','Value',...) creates a new FACEDETECION or raises the%      existing singleton*.  Starting from the left, property value pairs are%      applied to the GUI before facedetecion_OpeningFcn gets called.  An%      unrecognized property name or invalid value makes property application%      stop.  All inputs are passed to facedetecion_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 facedetecion% Last Modified by GUIDE v2.5 01-May-2017 19:18:42% Begin initialization code - DO NOT EDITgui_Singleton = 1;gui_State = struct('gui_Name',       mfilename, ...                   'gui_Singleton',  gui_Singleton, ...                   'gui_OpeningFcn', @facedetecion_OpeningFcn, ...                   'gui_OutputFcn',  @facedetecion_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 facedetecion is made visible.function facedetecion_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 facedetecion (see VARARGIN)% Choose default command line output for facedetecionhandles.output = hObject;% Update handles structureguidata(hObject, handles);% UIWAIT makes facedetecion wait for user response (see UIRESUME)% uiwait(handles.figure1);% --- Outputs from this function are returned to the command line.function varargout = facedetecion_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 myvideo myvideo1;[fileName,pathName] = uigetfile('*.*','Please select an video');%文件筐，选择文件  if(fileName)     fileName = strcat(pathName,fileName);     fileName = lower(fileName);%一致的小写字母形式  else   %   J = 0;%记录区域生长所分割得到的区域    msgbox('Please select an video');     return; %退出程序  end  % boxlnserter = vision.ShapeInserter('BorderColor','Custom','CustomBorderColor',[255 0 0]);% videoOut = step(boxlnserter,videoFrame,bbox);myvideo = VideoReader(fileName);nFrames = myvideo.NumberOfFramesvidHeight = myvideo.HeightvidWidth = myvideo.Widthmov(1:nFrames) = struct('cdata',zeros(vidHeight,vidWidth,3,'uint8'),'colormap',[]); B_K = read(myvideo,1); axes(handles.axes1);    imshow(B_K);   % myvideo = VideoReader(fileName);% nFrames = myvideo.NumberOfFrames% vidHeight = myvideo.Height% vidWidth = myvideo.Width% mov(1:nFrames) = struct('cdata',zeros(vidHeight,vidWidth,3,'uint8'),'colormap',[]);%  B_K = read(myvideo,1);%     axes(handles.axes1);%     imshow(B_K);% --- Executes on button press in pushbutton2.function pushbutton2_Callback(hObject, eventdata, handles)% hObject    handle to pushbutton2 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)global myvideo myvideo1;nFrames = myvideo.NumberOfFramesvidHeight = myvideo.HeightvidWidth = myvideo.Widthmov(1:nFrames) = struct('cdata',zeros(vidHeight,vidWidth,3,'uint8'),'colormap',[]); faceDetector = vision.CascadeObjectDetector();% videoFileReader = vision.VideoFileReader(fileName);% videoFrame = step(videoFileReader);

三、运行结果

四、备注

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