The HDR-AS15 has a Digital image stabilizer type which is better than the Optical image stabilizer type found on most camcorders that have been around for around the same time as it. 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 big total megapixels video cameras that came out more than two years ago.
The best image stabiliser type amongst similar types of video camera is Optical.