Question

新人求助，matlab调用摄像头

Answer 1

　　首先确定安装好了摄像头的驱动，打开“应用程序”>“image acquisition”查看

　　新建图形用户界面：“新建”>“图形用户界面”

　　从左侧选择控件，添加到面板

　　双击空间进行属性设置，“string”为显示名称，“tag”为id。将两个axes的“visable“属性设置为”off“

　　更改”.m“文件：
　　function varargout = untitled1(varargin)
　　% UNTITLED1 MATLAB code for untitled1.fig
　　% UNTITLED1, by itself, creates a new UNTITLED1 or raises the existing
　　% singleton*.
　　%
　　% H = UNTITLED1 returns the handle to a new UNTITLED1 or the handle to
　　% the existing singleton*.
　　%
　　% UNTITLED1('CALLBACK',hObject,eventData,handles,...) calls the local
　　% function named CALLBACK in UNTITLED1.M with the given input arguments.
　　%
　　% UNTITLED1('Property','Value',...) creates a new UNTITLED1 or raises the
　　% existing singleton*. Starting from the left, property value pairs are
　　% applied to the GUI before untitled1_OpeningFcn gets called. An
　　% unrecognized property name or invalid value makes property application
　　% stop. All inputs are passed to untitled1_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 untitled1
　　
　　% Last Modified by GUIDE v2.5 12-Mar-2015 20:53:43
　　
　　% Begin initialization code - DO NOT EDIT
　　gui_Singleton = 1;
　　gui_State = struct('gui_Name', mfilename, ...
　　'gui_Singleton', gui_Singleton, ...
　　'gui_OpeningFcn', @untitled1_OpeningFcn, ...
　　'gui_OutputFcn', @untitled1_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 untitled1 is made visible.
　　function untitled1_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 untitled1 (see VARARGIN)
　　
　　% Choose default command line output for untitled1
　　handles.output = hObject;
　　
　　% Update handles structure
　　guidata(hObject, handles);
　　
　　% UIWAIT makes untitled1 wait for user response (see UIRESUME)
　　% uiwait(handles.figure1);
　　
　　
　　% --- Outputs from this function are returned to the command line.
　　function varargout = untitled1_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;
　　
　　global vid;
　　vid = videoinput('winvideo');
　　%set(vid,'ReturnedColorSpace','grayscale');
　　
　　function pushbutton1_Callback(hObject, eventdata, handles)
　　axes(handles.axes1);
　　global vid;
　　vidRes = vid.VideoResolution;
　　nBands = vid.NumberOfBands;
　　hImage = image( zeros(vidRes(2), vidRes(1), nBands) );
　　preview(vid, hImage);
　　
　　
　　% --- 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)
　　axes(handles.axes2);
　　global vid;
　　f=getsnapshot(vid);
　　imshow(f);

　　6
　　点击运行，单击”preview“进行预览，单击”snapshot“捕获图像