Tag Archives: compression

How To Achieve Effective Motion Detection

SecuritySpy’s motion detection algorithm employs many techniques in order to accurately detect real motion events while minimising the rate of false-positive detections. But besides an effective algorithm, there are many choices about the setup and configuration of your video surveillance system that will help achieve reliable motion detection – these are outlined below.

1. Camera Angle

How you position and point the camera, as well as the focal length of the lens (how wide-angle it is) makes a big difference to the effectiveness of motion detection. The key points to consider are as follows:

  • The activity you want to capture should be relatively large in the frame. Don’t use a camera with a very wide-angle lens, as this will make objects and people appear very small – too small to trigger motion detection or make out any important features such as faces.
  • Point the camera downwards and don’t include any sky in the frame. At certain times of the day the sun may glare into the camera which would impair the its ability to render the scene with good enough definition, and may even damage its sensor.
  • Include just the area you want to capture in the frame; don’t include any irrelevant areas as this simply wastes the resolution of your camera.

Here is an example of a bad camera angle for motion detection:

Bad Camera Angle

Bad Camera Angle For Motion Detection

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Comparison of Streaming Formats

The latest version of SecuritySpy supports new streaming formats which significantly enhance compatibility with new and existing network cameras. The following information about these formats will be useful when making purchasing decisions and setting up video surveillance systems based upon SecuritySpy.

Network Streaming Protocols
There are two main protocols used for carrying video and audio data over IP networks: HTTP and RTSP. Using these protocols, it is possible to transmit video and audio in various compression formats (JPEG, MPEG-4, H.264, AAC etc.).

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