Livelink for MATLAB/COMSOL mphimage2geom help?

I'm trying to take an image from MATLAB and turn it into a geometry in COMSOL. I'm able to get the image into MATLAB just fine, but can't figure out how to turn it into a geometry for a COMSOL model. It sounds like mphimage2geom should work, but I keep getting error messages.

The syntax I've been trying to use is:

model=mphimage2geom(imagedata, level,...)

I'm assuming "imagedata" should just be the variable I have my image saved as, but I don't know what "level" corresponds to.

Any help would be very much appreciated. Thank you.

[Jiawei]

level = C means a slice to the image with contour value C