General information

The scanning mode in Axxon One can improve detection of small objects or objects in areas far away from the camera. For example, when the camera is placed at a long distance and objects (such as people, smoke, fire) are small in the frame, scanning mode can improve detection.

In the scanning mode, the frame is divided into scanning windows for detection accuracy.

Scanning windows are parts of the frame that are analyzed separately and all together at the same time. Each scanning window analyzes a different part of the frame and detects events in it.

Scanning mode is available for the fire and smoke detection, pose detection, Neurocounter, Neurotracker.

The scanning mode doesn’t provide absolute detection accuracy, regardless of the number of windows.

Configuring the scanning mode

You can configure the scanning mode using the parameters of the corresponding detection tool. The list of required parameters and their values are presented in the table below.

ParameterValueDescription
Scanning windowYesSelect the Yes value to enable the scanning mode
No
Scanning window heightNumeric value (in pixels)

The height and width of the scanning window are determined according to the actual size of the frame and the required number of windows.

For example, the real frame size is 1920×1080 pixels. To divide the frame into four equal windows, set the width of the scanning window to 960 pixels and the height to 540 pixels

Scanning window width
Scanning window step height

The scanning step determines the relative offset of the windows. If the step is equal to the height and width of the scanning window respectively, the segments will line up one after another. 

Reducing the scanning step will increase the detection accuracy, but will also increase the CPU load. Decreasing the step below the height or width of scanning will cause the segments to overlap, while increasing the step can cause the detection tool to malfunction

Scanning window step width

Recommendations for configuring the scanning mode

  1. Set the same values for the window height and scanning step, as well as the window width and scanning step.
  2. Set the optimal number of scanning windows—from four to eight.
  3. The number of windows will depend on specific purposes, quality of the original frame, capabilities of devices. If the original frame is of low quality or small size, a large number of windows won’t increase the detection accuracy, but can lead to false alarms or no detection.
  4. You must select the number of scanning windows experimentally.
  5. If you didn’t get the detection tool responses at the same values of window and step, you must experimentally reduce the scanning steps relative to the height or width.

Increasing the number of windows increases the load on the device.

Example of configuring the scanning mode

It is necessary to configure the scanning mode for the smoke and fire detection to detect smoke in the distance. If the actual frame size is 1920×1080 pixels, set the following values in the detection tool settings to divide the frame into four equal windows:

  1. Scanning window—Yes.
  2. Scanning window height—540.
  3. Scanning window width—960.
  4. Scanning window step height—540.
  5. Scanning window step width—960.

As a result, the frame will be conditionally divided into four equal windows that will be analyzed separately and all together at the same time. If smoke or fire is detected in any of these windows, the detection tool can trigger.