Triggeractivation error in image acquisition toolbox

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HYZ
HYZ 2023-3-3
回答： Sachin 2023-3-16
Hi, I tried to record a video using Image acquisition toolbox.
src.TriggerActivation threw an error as below:
Attempt to modify currently read-only or inaccessible property: TriggerActivation.
Use IMAQHELP(OBJ, 'TriggerActivation') for information.
Could anyone suggest? Thanks.
vobj = videoinput("gentl", 1, "Mono8");
src = getselectedsource(vidobj);
vobj.LoggingMode='disk';
src.AcquisitionFrameCount = 200;
src.AcquisitionFrameRateEnable = "True";
src.AcquisitionFrameRate = 50;
src.ExposureAuto = "Off";
src.TriggerMode = "On";
src.TriggerSelector = "AcquisitionStart";
src.TriggerSource = "Software";
src.TriggerActivation = 'RisingEdge';
src.ExposureTime = 15000;
diskLogger = VideoWriter('C:\Users\user\Desktop\cameratest\test.avi', 'Grayscale AVI');
diskLogger.FrameRate = 50;
vobj.DiskLogger = diskLogger;
start(vidobj)
stop(vidobj)

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回答（1 个）

Sachin
Sachin 2023-3-16
Hi @HYZ,
I understand that you are getting error 'Attempt to modify currently read-only or inaccessible property: TriggerActivation' .
Some properties are only read-only in ‘videoinput’ object i.e. you cannot update those properties.
e.g. ‘Videoformat’ property is a read-only property and it is set by the ‘videoinput.’
Try this command after creating ‘videoinput’ object ‘vobj’ which will give you more information about the ‘triggeractivation’ property
imaqhelp(vobj,'Triggeractivation')
You can refer to the following page for more information about ‘videoinput’ and read-only properties.
https://www.mathworks.com/help/imaq/videoinput.html
Thanks
Sachin

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