please any help to CHANGE THIS CODE to acquire one gray image per 3 minute

hi i have this code that take video and many frame

all what i want is to take one gray image and one frame only avery 3 minute

imaqreset;
obj = videoinput('winvideo',1,'YUY2_640x480');
% triggerconfig(obj,'manual');
set(obj,'FramesPerTrigger',Inf);
set(obj,'ReturnedColorspace','RGB');
obj.FrameGrabInterval = 1;
framesneed = 1;
start(obj);

while(obj.FramesAcquired<=framesneed) 

      RGB2=getsnapshot(obj);
      imshow(RGB2);
      pause(3);
  end
  stop(obj);
  delete(obj);

Answer 1

[Mahdi]

Change the pause line to pause(180). It reads it in seconds.

[mangood UK]

thank you

what about the number of frame i need only one frame ??

and for gray???

[Walter Roberson]

FramesPerTrigger 1

ReturnedColorspace grayscale

[Mahdi]

Thanks Walter, I must be tired. I didn't notice the other questions.

[mangood UK]

thank you both

i will keep thread open for more problem if happen

rgards

Answer 2

[mangood UK]

thier is aproblem

my webcam have high resolution as i think

but in matlab say maximum resolution is only 640*480

how to solve this

can any suggestion

regards

[Walter Roberson]

Please show us the output of

devinfo = imaqhwinfo('winvideo', 1);
devinfo.SupportedFormats

[mangood UK]

hi walter

sorry for delay

this is the output of your code

Columns 1 through 2

    'YUY2_160x120'    'YUY2_320x240'

Column 3

    'YUY2_640x480'