Multiple image acquisition objects cannot access the same device simultaneously.

i am getting an error that i can't bug, can anyone help me ,following is the code error:Multiple image acquisition objects cannot access the same device simultaneously. vid=videoinput('macvideo',1,'YCbCr422_1280x720'); triggerconfig(vid,'manual'); set(vid,'FramesPerTrigger',1); set(vid,'TriggerRepeat',Inf); start(vid); while(1) for j=1:3 trigger(vid); im=getdata(vid,1); if j==1 i_bef=im; end if j==3 i_aft=im; end end [x,y,u]=isub(i_aft,i_bef); end

Answer 1

[Image Analyst]

Does "videoinput" appear anywhere else in your m-file? It thinks you're trying to get more than one object talking to your camera.