User`s guide

Deleting Image Acquisition Objects

5-25

Deleting Image Acquisition Objects

When you finish using your image acquisition objects, use the delete function to remove

them from memory. After deleting them, clear the variables that reference the objects

from the MATLAB workspace by using the clear function.

Note When you delete a video input object, all the video source objects associated with

the video input object are also deleted.

To illustrate, this example creates several video input objects and then deletes them.

Create several image acquisition objects — This example creates several

video input objects for a single webcam image acquisition device, specifying several

different video formats. To run this example on your system, use the imaqhwinfo

function to get the object constructor for your image acquisition device and substitute

that syntax for the following code.

vid = videoinput('winvideo',1);

vid2 = videoinput('winvideo',1,'RGB24_176x144');

vid3 = videoinput('winvideo',1,'YV12_352x288');

Clean up — Always remove image acquisition objects from memory, and the

variables that reference them, when you no longer need them.

You can delete image acquisition objects one at a time, using the delete function.

delete(vid)

You can also delete all the video input objects that currently exist in memory in one

call to delete by using the imaqfind function. The imaqfind function returns an

array of all the video input objects in memory.

imaqfind

Video Input Object Array:

Index: Type: Name:

1 videoinput RGB555_128x96-winvideo-1

2 videoinput RGB24_176x144-winvideo-1

3 videoinput YV12_352x288-winvideo-1