Image Acquisition Toolbox: Obtaining Camera Property Constraint Values

I'm currently attempting to obtain the available range of values for a number of camera settings using the Image Acquisition Toolbox, using multiple cameras that require either Mathlab's 'dcam' or 'gige' adaptor. In the case of the dcam, this is no problem, as I simply do the following:

 vid = ('dcam',1,'someFormat');
 src = getselectedsource(vid);
 info = propinfo(src);
 limits = info.someProperty.ConstraintValue;

The ConstraintValue field for each property gives me all the information I need. Now for the problem: in the case of the 'gige' adaptor, the ConstraintValue fields return as empty. However, it seems that this constraint info must exist somewhere, as if I try to set properties to values that are apparently outside their bounds using imaqtool, I get a message like the following:

 Warning: The value of AcquisitionFrameRateAbs should be between 0.014552 and   5.084944.

So is there some way [other than propinfo()] to find this information using the Image Acquisition Toolbox ?

[Evan]

Note that "AcquisitionFrameRateAbs" was probably a bad example, as another property lists the value bounds for the Framerate. Other properties, however, do not have this information stored in another field, so this solution wouldn't work for any other setting.

[Evan]

Finally, one workaround that I could think of would be to set each property to a value that is always "wrong," then parse the warning message by calling lastwarn. Manageable, but certainly messy and will complicate code considerably. If at all possible, I'd like to avoid this.

Answer 1

[Evan]

Just for the sake of having a "temporary" answer for this question, below is described the workaround I settled on for this issue:

   if strcmp(info.Constraint,'none') %If propinfo() doesn't return information
       set(src,'someProperty',-1e010) %Set property to "out-of-bounds" value
       limits = regexp(lastwarn,'(\d+(\.\d+)?)','match'); %Parse warn for limits
   else
       limits = info.someProperty.ConstraintValue;
   end