To configure the water level detection, do the following:

1. Select the detection tool.

2. To record water level detection readings to the archive, set Yes for the Record mask to archive parameter (1).
   

3. If the camera supports multistreaming, select the stream for which detection is needed. Select a low-quality video stream to reduce the Server load (2).
4. Select a processing resource for decoding video streams (3). When you select a GPU, a stand-alone graphics card takes priority (when decoding with NVIDIA NVDEC chips). If there is no appropriate GPU, the decoding will use the Intel Quick Sync Video technology. Otherwise, CPU resources will be used for decoding.

5. Analyzed framed are scaled down to a specified resolution (4, 1920 pixels on the longer side). This is how it works:

   1. If the longer side of the source image exceeds the value specified in the Frame size change field, it is divided by two.

   2. If the resulting resolution falls below the specified value, it is used further.

   3. If the resulting resolution still exceeds the specified limit, it is divided by two, etc.

      For example, the source image resolution is 2048*1536, and the specified value is set to 1000. In this case, the source resolution will be halved two times (down to 512*384), as after the first division, the number of pixels on the longer side exceeds the limit (1024 > 1000).

      
      

      If detection is performed on a higher resolution stream and detection errors occur, it is recommended to reduce the compression.

      
      

6. Set the frame rate value for the detection tool to process per second (5). This value should be in the range [0.016, 100].

7. If the water in the frame is transparent and the detector cannot correctly identify its level, use neural network. Do the following:

   1. Select Yes for the Neural Network parameter (6).

   2. Select the neural network file (7).

8. Select a processing resource to run the detection algorithm on (8). If neural network is not used, the algorithm can run on the CPU only (see General Information on Configuring Detection). 
9. On the measurement scale (9, 10), set the top and bottom visible values in normal conditions.
10. Move the anchor points  in the preview window:

    1. to set the measurement scale in the frame;
       

       Top and bottom values of the measurement scale should match the actual settings (see i. 9).

       
       

       Water level sensor is shown in the lower left corner. If the sensor is blue, the water level is below high and critical marks. If the sensor is yellow, the water level is at high mark, but below critical mark. A red sensor means that water level is above critical mark.

       
       

    2. draw a line to set the top limit for water level upon reaching which the detection tool triggers an alarm;
    3. draw a line to set the top limit for water level upon reaching which the detection tool highlights the sensor icon in the video surveillance window with yellow color.
11. Click the Apply button.

When you have created a detection tool, you can see a sensor on the layout in the video surveillance window.

If the sensor icon is green , the water level is lower than both critical and high marks. If the icon is yellow , the water level is above the high mark, but below the critical mark. A red icon means that the water level is above the critical mark.

 You can also add a numerical value of the water level to the video surveillance window (see Configuring display of water level detection).