新人求助，matlab调用摄像头

试一试这个程序，调用笔记本电脑自带摄像头
vid=videoinput('winvideo');
set(vid,'TriggerRepeat',inf);
h=figure('units','normalized','menubar','none','numbertitle','off');
ha=axes('parent',h,'units','normalized','position',[.005 .7 .99 .925]);
axis off;
hb=uicontrol('parent',h,'units','normalized','position',[.01 .1 .199 .6],'string','Preview','callback',...
    ['hf=figure(''units'',''normalized'',''menubar'',''none'',''numbertitle'',''off'');'...
    'axes(''parent'',hf,''units'',''normalized'',''position'',[.005 .007 .99 .99]);'...
    'objRes=get(vid, ''VideoResolution'');'...
    'nBands=get(vid,''NumberOfBands'');'...
    'hImage=image(zeros(objRes(2),objRes(1),nBands));'...
    'preview(vid,hImage);']);