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Understanding digital images Additional reading
Your VL1 allows you to take either videos or photos or both. The choice
depends on what images you are trying to record.
The VL1 uses a single 1.3 Mega-pixel (Mp) image sensor to capture both
photos and video. This sensor has 1280 unique cells horizontally and 1024
cells vertically. In total it has 1280 x 1024 = 1310720 pixels or 1.3Mp
Digital video
A digital video is a succession of such digital frames played to the viewer
at a certain rate frames per second. The human eye can distinguish up
to 20 frames per second but anything faster gives the illusion of full
animation. The faster the frame rate, the smoother the video but the
more storage it requires. Similarly the larger the picture size the more
storage is required. The VL1 will automatically decide on the best frame
rate for each recording.
Page No. 43
Each cell is capable of measuring light
levels and colour. The camera lens
focuses the image onto the image
sensor and the camera reads the light
and colour level of every cell. It
stores this information as a digital
picture or frame.
©Securesight 2009 E&OE Issue 1.0
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