Video Examination –
A variety of enhancement techniques can be employed on video evidence, it is important that the best video recording be submitted to obtain the best enhancement results, limitations on the enhancement process may exist if an analog copy or digital file that has undergone additional compression is submitted for analysis, techniques can include:
- Sharpening – makes edges of images in the recording become clearer and more distinct.
- Video Stabilization – reduce the amount of movement in the video, producing the smoothest possible playback.
- Masking – covers the face or areas of the video that may protect a witness, victim or law enforcement officer.
- Interlacing – in an analog system, interlaced scanning is used to record images (a technique of combining two television fields to produce a full frame of video). A process called de-interlacing may be used to retrieve the information in both fields of video.
- Demultiplexing – allows the isolation of each camera, in CCTV system a device called multiplexer is used to combine multiple video signals into a single signal or separate a combined signal. These devices are frequently used in security and law enforcement applications for recording and/or displaying multiple camera images simultaneously or in sessions.
