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Figure 8-20 Face detection result
8.4 Setting IVS
This section introduces scene selection requirements, rule conguration, and global conguration
for IVS (intelligent video system).
Basic requirements on scene selection are as follows.
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The target should occupy no more than 10% of the whole image.
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The target size in the image should be no less than 10 × 10 pixels. The size of abandoned object
in the image should be no less than 15 × 15 pixels (CIF image). The target height and width
should no more than a third of the image height and width. The recommended target height is
10% of the image height.
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The brightness dierence of the target and the background should be no less than 10 gray
levels.
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The target should be continuously present in the image for no less than two seconds, and the
moving distance of the target should be larger than its width and no less than 15 pixels (CIF
image) at the same time.
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Reduce the complexity of surveillance scene as much as you can. Intelligent analysis functions
are not recommended to be used in scene with dense targets and frequent illumination change.
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Avoid areas such as glass, reective ground, water surface, and areas interfered by branch,
shadow and mosquito. Avoid backlight scene and direct light.
8.4.1 Global Conguration
Set global rules for IVS, including anti-disturb, depth of eld calibration, and valid motion
parameter for targets.
Calibration Purpose
Determine corresponding relationship between 2D image captured by the camera and 3D actual
object according to one horizontal ruler and three vertical rulers calibrated by the user and the
corresponding actual distance.
Operation Manual
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