Dragonframe 4.2.2: YES
Dragonframe 3.7.4: YES
Dragon Stop Motion 2.3.8: YES
(Dragonframe was previously called Dragon Stop Motion)
The Canon EOS 550D provides a live view via its USB connection. The live view size is 1056 x 704.
Dragonframe controls the Canon EOS 550D ISO, shutter speed, aperture (with digital lens), image quality, and size.