如何在Ubuntu14.04下Matlab调用摄像头

如果把四个摄像头分别插在电脑的四个USB口，可以同时预览四个摄像头的画面 2.用USB HUB连接之后，matlab可以识别四个摄像头，并且可以设置每个摄像头的对象 3.每次都能开启一个摄像头进行预览，然后就打不开其他的了。

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.

% hObjecthandle to figure

% eventdata reserved - to be defined in a future version of MATLAB

% handlesstructure 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)

% hObjecthandle to figure

% eventdata reserved - to be defined in a future version of MATLAB

% handlesstructure 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)

% hObjecthandle to pushbutton2 (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handlesstructure 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

首先打开已经注册过的MATLAB软件，界面如图。

如何利用MATLAB调用USB摄像头并显示图像

通过imaqhwinfo函数查看电脑上视频设备。

如何利用MATLAB调用USB摄像头并显示图像

选择‘winvideo’,并将设备信息赋值给变量info,

如何利用MATLAB调用USB摄像头并显示图像

返回的也是一个结构体，将设备的信息赋值给dev_info,

如何利用MATLAB调用USB摄像头并显示图像

同样返回的是一个结构体，我想需要的是设备的ID和其支持的分辨率，查看SupportedFormats中的详细信息.

如何利用MATLAB调用USB摄像头并显示图像

下面就可以创建视频输入对象了，定义为vid,vid函数有好几种形式，我们选择视频为最大分辨率，将显示设备的一些信息。

如何利用MATLAB调用USB摄像头并显示图像

使用preview函数即可将图像数据显示在屏幕上，preview(vid).

如何利用MATLAB调用USB摄像头并显示图像

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