videoinput object dimensions in custom GUI

Hi,

I am trying to acquire and process video frame by frame. So far I am able to achieve the task but my problem about setting dimension/size of videoinput object.

I am creating it as follows-

obj = videoinput('winvideo', deviceId, 'RGB24_640x480','ReturnedColorSpace','rgb');

triggerconfig(obj, 'manual');

set(obj, 'Tag', appTitle, 'FramesAcquiredFcnCount', 1, ... 'TimerFcn', @localFrameCallback, 'TimerPeriod', 0.01);

start(obj);

it opens the live video streaming and starts grabbing frames and does the necessary job in localFrameCallback.

Even if I try as follows-

obj = videoinput('winvideo', deviceId, 'RGB24_2592x1944','ReturnedColorSpace','rgb'); still the video streaming opens in same size/dimensions.

Can anybody please suggest how can I manipulate/ change videoinput object size/dimensions?

Note: I am using peekdata to grab frame.

Answer 1

[Image Analyst]

It should not. It should be created with the new size. Make sure you call delete() or clear() on the obj to make sure it's completely blown away before you try to create it anew.

[Image Analyst]

Can you use preview() instead of start?

Answer 2

[Yogi]

Thanks for reply. Yes I am calling delete() and clear as well to clear that obj completely, like this - delete(obj); clear obj;

As soon as I restart with different resolution it still shows in same size.I am not getting any clue.

Answer 3

[Yogi]

Please note I am using Matlab R2011b 32-bit.