%获取摄像头视频，并计算倾斜角，OK。
aviobj.quality = 100;
vid = videoinput(\'winvideo\',1);
set(vid,\'returnedcolorspace\',\'rgb\');
set(vid,\'framespertrigger\',10);
set(vid,\'timerperiod\',1);
set(vid,\'triggerrepeat\',0);
set(vid,\'timeout\',10);
vidRes = get(vid, \'VideoResolution\');
nBands = get(vid, \'NumberOfBands\');
subplot(1,2,1);
hImage = imshow( zeros(vidRes(2), vidRes(1), nBands),\'truesize\' );
preview(vid,hImage);
%frame{1} = getsnapshot(vid);
j=0;
while(1)
tic;
j=j+1;
   str = get(gcf,\'currentkey\');
   if strcmp(str,\'space\')
      break;
   else
    frame = getsnapshot(vid);%frame是当前的一帧彩色图像
    %gray=rgb2gray(frame);
    %subplot(1,2,2);plot(BMetric(event.Data,1),\'-.r\');
    angle=Aangle(frame);
    %subplot(1,2,2),imshow(gray,\'truesize\');
   % subplot(1,2,2),axis( [0 2000 0 100]),plot(j,angle,\'-or\'),hold on;
  
   end
 m(:,j)=getframe(gcf);
toc;
end
MOVIE2AVI(m,\'angle1.avi\',\'FPS\',3); %convert the movie matrix an avi file