The HDR-AS15 has a Digital image stabiliser which is better than the Optical image stabiliser found on most similar spec camcorders that have been around for more than two years. Some compact cameras have digital Image stabilisation only, which simply boosts camera sensitivity (ISO) to obtain a faster shutter speeds to help prevent blur. No hardware is involved.
This video camera's image stabiliser type (Digital) is actually the worst image stabiliser type across all video cameras of this type and age.
An Optical image stabiliser is the best image stabiliser type across comparable types of video camera.