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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 detector to receive more events, which improves the accuracy of detecting distant or small objects that might otherwise can be missed.
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The scanning mode doesn’t provide absolute detection accuracy, regardless of the number of windows. |
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| 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 increases the number of windows due to their overlapping each other with an offset. This increases the detection accuracy, but also increases the CPU load
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| Scanning window step width |
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- 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 depends 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 events from a detector or no detection. You must select the number of scanning windows experimentally.
- If you didn’t don't get events from a detector 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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It is necessary to configure the scanning mode for the smoke detection detector to detect smoke in the distance. If the actual frame size is 1920×1080 pixels, set the following values in the detector settings to divide the frame into four equal windows:
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