Scene Filter

Filters the input from a camera, to remove records that do not show the intended scene. To determine whether the camera is recording the intended scene, the input records are compared to a stored image. You can use this engine to filter out records, and therefore stop analysis, when a PTZ-capable CCTV camera has been moved by the operator.

Configuration Parameter Description
AnalysisInterval Specifies how often to compare the input to the background image.
BackgroundImage An image of the intended scene.
Input The name of the image track to analyze.
MaxMatchDifference The average difference in luminosity between pixels in the ingested frame and pixels in the stored image must not exceed this value for the scenes to be considered the same.
MinMatchCorrelation The correlation between the pixels in the ingested frame and pixels in the stored image must exceed this value for the scenes to be considered the same.
MinTransitionTime The minimum time duration that must pass before Media Server starts or stops filtering records.
Type The engine to use. Set this parameter to SceneFilter.

Output Tracks

This engine produces a single output track, named TaskName.Output. This track is a copy of the input track, but filtered so that it only contains video frames that match the background image. If the camera is moved to view another scene, the input video frames are filtered out.