Securesight VL1 Specifikace stáhnout pdf (Strana 45)

©Securesight 2009 E&OE Issue 1.0

Page No. 44

To store video in a practical way and maximise the number of clips that

can be stored on a single SD memory card the VL1 compresses video in to

frames that match the video standard of 320 x 240 pixels or QVGA. Video

and photos still have the same field of view but video offers considerably

lower resolution than a photo.

Video is ideal for capturing action but photos are better for recognition.

Comparison of a

320 x 240 video frame

to 800 x 600 photo.

Digital Photos

Whilst digital photos cannot capture the action, they are very good for

providing evidence for identification of people.

Unlike digital video where each frame or picture must be small in size to

be recorded and stored quickly, because speed is not so important when

storing a photo they can be much larger and contain more pixels and

hence more information.

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Securesight VL1 Specifikace Strana 45