Couple of days ago I was given a task to configure CCTV DVR device (AVTech 4 Channel MPEG 4 recorder). I prefer the embedded device approach as opposed to the cheap PC CCTV cards as the latter requires a full blown PC and it depends on Windows operating system (which naturally incur additional costs).
The AVTech CCTV DVR is priced slightly higher, but you get the perks of having a dedicated and compact device for your CCTV solution. It has a network interface which lets you configure and view your CCTV security camera over the internet.
Motion Detector Settings
Generally I’ve no trouble at all in using AVTech, the only thing that I’ve hard time figuring is the motion detector settings, which allows the camera to record the video only if it detects movement on one of its cameras.
Fortunally I found a source which reveals the meaning of each configurable settings on the AVtech CCTV device :
The sensitivity of comparing two different images. The smaller the value is,
the higher sensitivity for motion detection. The highest sensitivity setting is 00 and the lowest sensitivity setting is 15. The default value is 07.
The sensitivity regarding the size of the triggered object on the screen (the number of motion detection grids). The smaller the value, the higher sensitivity for motion detection. The highest sensitivity setting is 00 and the lowest sensitivity setting is 15. The default setting is 03.
Note: The default setting of Spatial Sensitivity is 03, which means once a object
is detected more than 3 grids, the system will get triggered. So the value
of Spatial Sensitivity must be less than the number of grids that you set
up for the motion detection area.
The sensitivity regarding how long the object gets triggered. The smaller the value, the higher motion detection sensitivity will be. The highest sensitivity setting is 00 and the lowest sensitivity setting is 15. The default setting is 02.
The value of RE is a reference for detection. The default value is 10, which means DVR will compare 10 continuous images at one time according to the sensitivity of LS, SS, TS simultaneously. The bigger the value, the higher sensitivity for motion detection. The highest sensitivity is 61.