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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.
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Scanning windows are parts of the frame that are analyzed separately and all together at the same time. Scanning windows allow the detection tool to receive more events, which improves the accuracy of detecting distant or small objects that might otherwise be missed.
Scanning mode is available for Fire Detection, Smoke Detection, Pose detection, Neurocounter, Neurotracker.
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The scanning mode doesn’t provide absolute detection accuracy, regardless of the number of windows. |
The scanning mode is available for:
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.
| Parameter | Value | Description | ||||
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| Scanning window | Yes | Select the Yes value to enable the scanning mode | ||||
| No | ||||||
| Scanning window height | Numeric 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 height or width of the scanning step will increase the number of windows due to their overlapping each other with an offset. This will increase the detection accuracy, but will also increase the CPU load
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| Scanning window step width |
Recommendations for configuring the scanning mode
- Set the same values for the window height and scanning step, as well as the window width and scanning step.
- Set the optimal number of scanning windows—from four to eight. 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. You must select the number of scanning windows experimentally.
- 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.
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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 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:
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