Displaying all frames after capturing video on webcam

Question

Maria 2012-6-22

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/41831-displaying-all-frames-after-capturing-video-on-webcam

I want to display frames after capturing live video from webcam. The number of frames are specified in while loop.I am using imaqmontage but it displays only last frame where should I place this function so that I get all the frames capture after I stop my webcam.below is my code:

a = imaqhwinfo;
%[camera_name, camera_id, format] = getCameraInfo(a);
% Capture the video frames using the videoinput function
% You have to replace the resolution & your installed adaptor name.
vid = videoinput('winvideo');
% Set the properties of the video object
set(vid, 'FramesPerTrigger', Inf);
set(vid, 'ReturnedColorspace', 'rgb')
vid.FrameGrabInterval = 5;
%start the video aquisition here
start(vid)
figure
% Set a loop that stop after 100 frames of aquisition
while(vid.FramesAcquired<=20)
      % Get the snapshot of the current frame
     data = getsnapshot(vid);
     [frames timestamp] = getdata(vid,1);%to capture every available frame
     subplot(2,2,1:2);
     imshow(data)
     subplot(2,2,3); imshow(frames)
     subplot(2,2,4); imcontour(rgb2gray(frames),2);
     % Display the image
     set(gca, 'xticklabel', []);
     set(gca, 'yticklabel', []);
     xlabel([ 'Time Stamp t=' num2str(timestamp, '%2.1f') 'seconds']);
     pause(.5);
   end
stop(vid);
a = axes;
%Display each image frame acquired on axes a.
imaqmontage(data, 'Parent', a);