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Operation Manual
Figure 8-22 Face detection result
8.4 Setting IVS
This section introduces scene selection requirements, rule configuration, and global configuration
for IVS (intelligent video system).
Basic requirements on scene selection are as follows.
●The target should occupy no more than 10% of the whole image.
●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.
●The brightness difference of the target and the background should be no less than 10 gray
levels.
●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.
●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.
●Avoid areas such as glass, reflective ground, water surface, and areas interfered by branch,
shadow and mosquito. Avoid backlight scene and direct light.
8.4.1 Global Configuration
Set global rules for IVS, including calibration area, calibration verification, and global sensitivity. Background Information
●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.
●Applicable Scene:
Medium or distant view with installation height of more than three meters. Scenes with
parallel view or ceiling-mounted are not supported.
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