I need help using image acquisition to record serveral AVI in a loop

Hi,

I have been working with MATLAB for a while now but i'm still new at this and have run into a problem that i need help on. recently I have been writing a code using image acquisition to record a behavior pattern of some paramecium while using a loop function function. The code works fine for the 1st AVI but when it loops back to record the 2nd AVI MATLAB would stop recording. The code I use is:

for i = 1:720

 vid = videoinput('dcam', 1, 'Y8_1024x768');

 vid.ROIPosition = [91 17 933 706];

 src = getselectedsource(vid);

 vid.FramesPerTrigger = 1;

 vid.FramesPerTrigger = 3000;

 src.FrameRate = '15';

 vid.LoggingMode = 'disk';

 Name = ['F:\51recordings_',int2str(i),'.avi'];

 diskLogger = avifile(Name, 'Compression', 'None', 'Quality', 75, 'keyframepersec', 2.14, 'FPS', 15);

 diskLogger = set(diskLogger, 'Colormap', gray(256));

 vid.DiskLogger = diskLogger;

 preview(vid);

 start(vid);

 pause(240);

 stoppreview(vid);

 diskLogger = close(vid.DiskLogger);

 close all

 clear

end

MATLAB would give me this error:

??? Error using ==> videoinput.videoinput at 388
dcam: Cannot determine device attributes when the device is in use.
Please close any running instances of this device.

Error event occurred at 11:13:44 for video input object: Y8_1024x768-dcam-1.
dcam: Error writing data to the DiskLogger file.
Failed to find the open file handle.
??? dcam: Error writing data to the DiskLogger file.
Failed to find the open file handle.

i think i need to close the preview window but i have tried close all and close all force but none of those have worked. I'm not sure what i should do any help would be appreciated.

Thank you,

Minh Tong

Answer 1

[Ilango]

Hey,

I think i found out what the problem was. The images that are being recorded in the first video stays in the object memory. I think it stops MATLAB from recording more. So after

 diskLogger = close(vid.DiskLogger);

add these two lines:

 delete(vid)

 clear vid

Worked for me.