title: Background subtracting in MATLAB
body: <p>I'm looking to do background subtracting on an image. I'm new to MATLAB and new to image processing/analysis, so sorry if any of this sounds stupid. 1) Other than <strong>imsubtract()</strong> are there other ways to do background subtracting (besides comparing one image to another)? 2) In the Math Works <a href="http://www.mathworks.com/access/helpdesk_r13/help/toolbox/images/intro24.html" rel="nofollow noreferrer">explanation</a> for imsubtract() why do they make their structuring element a disk? This seems rather difficult so far because every time I try something, I end up not only subtracting the noisy background but also losing the parts of the image I want to look at!</p>