Determining a rectangular composite for panorama

Hello

I have a question regarding the creating of a mesh for warping two matching images for stitching. I have found an example of an image stitching process that uses a rectangular mesh but I can't find a reference to read up on it. The code I am talking about is at (http://www.vlfeat.org/applications/sift-mosaic-code.html). The line of code I don't get is,
box2 = [1 size(im2,2) size(im2,2) 1 ;
1 1 size(im2,1) size(im2,1) ;
1 1 1 1 ] ;

Which basically uses the row and column size of the two images. I would be very grateful if somebody can point me to a paper of a book that explains this.

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