Problems recording from two cameras using hardware trigger (master-slave cable)?

Question

Elisa Frasnelli 2016-4-25

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/280875-problems-recording-from-two-cameras-using-hardware-trigger-master-slave-cable

编辑： Elisa Frasnelli 2016-4-25

I have tried to record from two identical cameras simultaneously (I need them to start recording at exactly the same time) using hardware trigger between the two cameras through a master-slave cable. It seems that Matlab doesn't wait for this hardware trigger and thus the slave camera doesn't start recording after the master camera starts. The slave camera starts with the command but not with the trigger from the master camera, this gives a delay of about 300 ms between the start of the slave and master camera. Below the code that I have been using:

FRAMES_PER_TRIGGER = 10; %Create video object 1 (master camera) masterVid = videoinput ('gige', 1, 'mono8'); %Create video object 2 (slave camera) slaveVid = videoinput ('gige', 2, 'mono8'); masterSrc = getselectedsource (masterVid); slaveSrc= getselectedsource (slaveVid); % configure parameters for the master camera %set(masterSrc, 'SyncOut1SyncOutPolarity', 'RisingEdge') triggerconfig(masterVid, 'immediate'); set(masterVid, 'FramesPerTrigger', FRAMES_PER_TRIGGER); set(masterSrc, 'SyncOut1SyncOutSource', 'Exposing');

% configure parameters for the slave configs = triggerinfo(slaveVid); triggerconfig(slaveVid, 'hardware'); set(slaveSrc, 'AcquisitionStartTriggerMode', 'on'); %set(slaveSrc, 'AcquisitionStartTriggerActivation', 'RisingEdge'); set(slaveSrc, 'AcquisitionStartTriggerSource', 'Line1'); set(slaveSrc, 'AcquisitionRecordTriggerMode', 'on'); set(slaveSrc, 'AcquisitionRecordTriggerActivation', 'RisingEdge'); set(slaveSrc, 'AcquisitionRecordTriggerSource', 'Line1');

% Start Acquistion start(slaveVid) isrunning(slaveVid) islogging(slaveVid) start(masterVid) isrunning(masterVid) islogging(masterVid) islogging(slaveVid)

wait(masterVid) wait(slaveVid)

fprintf('Master Frames Available: %d \n', masterVid.FramesAvailable); fprintf('Slave Frames Available: %d \n', slaveVid.FramesAvailable); masterData = getdata(masterVid, FRAMES_PER_TRIGGER); slaveData = getdata(slaveVid, FRAMES_PER_TRIGGER);

firstMasterFrame = masterData(:,:,:,1); firstSlaveFrame = slaveData(:,:,:,1); subplot(1,2,1), subimage(firstMasterFrame) subplot(1,2,2), subimage(firstSlaveFrame)