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As the most basic type of display multiplexer available, PIP units are rarely used, and yet extremely useful little devices.
Where two cameras are required to be displayed on a single monitor, the PIP can compress the secondary picture down to 1/9th of the normal screen size (1/4 option on some units) , and insert it into any corner of the main picture (see example below).
A typical application might be where a door entry camera views the area in front of the main entrance to a building, and the second camera identifies any visitors face on, this image being inserted into a dead corner of the main picture.
These units are also extremely useful for non security applications, such as interview monitoring, market and zoological research, and selected medical applications.
As well as inserting a second camera feed, the units will normally also allow the images to be swapped, or brought up full screen, either manually or by alarm contact closure. If recorded as a PIP insert, the image cannot be brought back up to full screen size, so this technique is really not at all suitable for mission critical applications.
(example covert image)
Two high resolution colour cameras were fitted with 6.2mm pinhole lenses (wide angle), and then 24Hour recorded onto a dedicated VHS Time Lapse Video Recorder
Picture quality was about 15% better during daylight hours.
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