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When a recumbent person is facing a camera or away from a camera, the correct operation of the detector isn't guaranteed.

To create the Person down detector, do the following:

Create the Human pose detector (see Configuring the Human pose detector).
Below the Human pose detector, click Create… → Person down detector.

By default, the Person down detector generates an event if a recumbent person is detected in the specified area.

If necessary, you can change the detector parameters. The list of parameters is given in the table:

Parameter	Value	Description
Other
Enable	Yes	The detector is enabled by default. To disable the detector, select the No value
Enable	No
Name	Person down detector	Enter the detector name or leave the default name
Type	Person down detector	Name of the detector type (non-editable field)
Basic settings
Number of measurements in a row to trigger detection	2	Specify the minimum number of frames with the corresponding pose or behavior for the detector to generate an event. The value must be in the range [1, 20]. The recommended (default) value is 2. Increasing the value can help eliminate false events but increases the risk of skips. Decreasing the value can help reduce skips, but increases the probability of false events

To save the parameters of the detector, click the Apply button. To cancel the changes, click the Cancel button.

To configure the detection area, do the following:

Set the detection area using the anchor points

in which a recumbent person must be detected.

For convenience of configuration, you can "freeze" the frame. Click the button. To cancel the action, click this button again.
To hide the detection area, click the button. To cancel the action, click this button again.
To delete the detection area, click the button.

Configuration of the detection area is complete.

For the Person down detector operation, you must configure the frame perspective first.

For this, do the following:

Specify the size of the same person in different parts of the frame by eye:

To create a leveling rod, left-click the video image to add two anchor points.
Set at least three calibration rods. The lower anchor points of any three rods must not be located on the same line (horizontal, vertical, slanting, and so on).
The size of the leveling rod must be about the average height of a person at this part of the frame.

You can resize the rod by stretching its anchor points

. You can move it on screen by dragging and dropping.
Axxon One 2.0 (english) > Person down detector > 13.jpg

When you set up leveling rods, the following conditions must be met:

the rods that are located at the same distance from the camera lens must be of the same size;
the feet of the rods must be located on the same surface (for example, floor);
in complex scenes, we recommend adding more than three rods to increase the accuracy of the detection;
in the parts of the frame where the lens vertical distortion is observed, the rods must be parallel to the nearest vertical objects (for example, door or wardrobe);
if you add only three leveling rods to a scene, you cannot remove them from the scene, you can resize them and change their location;
if you add more than three leveling rods to a scene, you can resize them and change their location, and remove them from the scene;
for portrait-oriented scenes (such as corridor, shopping aisle, warehouse aisle, and so on), the arrangement of the rods must form triangles.

For convenience of configuration, you can "freeze" the frame. Click the button. To cancel the action, click this button again.
The area for detection is displayed by default. To hide it, click the button. To cancel the action, click this button again.
To delete a rod, click the button.

Configuration of the Person down detector is complete.