Scan Converter

1 INTRODUCTION
The use of digital technology within the security industry has revolutionised CCTV systems. Unfortunately, along with the undoubted benefits that this development has introduced, police video technicians needing to extract information from such systems have experienced fresh difficulties beyond those encountered with analogue systems. There is a hierarchy of preferred export methods currently employed by the police. At the top of this list is the removal of data in its original digital format via CD, DVD, hard disk drive, etc. However, the design of digital CCTV systems has often not fully taken account of their role in crime investigation. Consequently, when police video technicians attempt to retrieve evidential video in this form, they often find that it may not be possible to do so or that extraction in this manner is prohibitively time consuming. Many digital CCTV systems have a ‘Video Out’ connection available, allowing an analogue signal to be output and subsequently recorded. Police video practitioners will use this method...