isvalid
Determine whether image acquisition object is associated with image acquisition device
Syntax
bool = isvalid(obj)
Description
bool = isvalid(obj)
returns true
if
the video input object obj
is valid, otherwise false
.
An object is an invalid image acquisition object if it is no longer
associated with any hardware; that is, the object was deleted using
the delete
function. If this is the case, obj
should
be cleared from the workspace.
If obj
is an array of video input objects, bool
is
a logical array where each element in bool
represents
the corresponding element in obj
. If an object
in obj
is valid, the isvalid
function
sets the corresponding element in bool
to true
,
otherwise false
.
Version History
Introduced before R2006a
See Also
delete
| imaqfind
| videoinput