How to captured 60 Frames in 1 Sec?

Question

SAMEER ahamed 2014-1-11

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/112087-how-to-captured-60-frames-in-1-sec

评论： Walter Roberson 2014-1-14

Hi, below sample code which it's 60 frames per 60 seconds , but i need to generate 60 frames in 1 sec ? if any idea?

if true
  % code
vid = videoinput('winvideo',1, 'MJPG_1280x720');
vid1 = vid;
num_frames=60;
triggerconfig(vid1, 'Manual');
set(vid1,'FramesPerTrigger',num_frames);
start(vid1);
while 1
[data1 time1] = getdata(vid1,num_frames);
kk=length(time1);
for i=1:kk
  F=data1(:,:,:,i);
  aviobj = addframe(aviobj,F);
end
aviobj = close(aviobj);
end
end

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Answer 1

Walter Roberson 2014-1-11

0
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https://ww2.mathworks.cn/matlabcentral/answers/112087-how-to-captured-60-frames-in-1-sec#answer_120599

Your code will capture as many frames per second as it can. As you request that all 60 frames be captured in one command, you are already making the request as quickly as practical for that library interface.

With the code you show, there are three possible reasons that your code might take 60 seconds to capture 60 frames:

your video camera frame-rate itself is set to 1 frame per second and you need to try to set() a different rate; or
you are running out of physical memory and your system is paging to disk; or
your bandwidth to your camera is not fast enough to transfer more than one frame per second at that image size

Question: why are you closing the aviobj within the "while 1" loop? You do not show opening the object.

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SAMEER ahamed 2014-1-14

编辑：Walter Roberson 2014-1-14

在 MATLAB Online 中打开

Now i have change above code like ,how to get 60 frames in 0.01 milliseconds any calculation need ?

     vid = videoinput('winvideo',1, 'MJPG_1280x720');
  vid1 = vid;
  num_frames=60;
  triggerconfig(vid1, 'Manual');
  set(vid1,'FramesPerTrigger',num_frames);
  start(vid1);
  trigger(vid1);
  frame = getsnapshot(vid1);
   [data1 time1] = getdata(vid1,num_frames);
   kk=length(time1);
    disp(kk);%kk value 60
  aviobj = avifile('myrecord17.avi');
for i=1:kk
    F=data1(:,:,:,i);
    aviobj = addframe(aviobj,F);
end
aviobj = close(aviobj);