To configure the Visitors counter:

1. If the camera supports multistreaming, select the stream to be used for detection. Select a low-quality video stream to reduce Server load (1).
   
2. Select a processing resource for decoding video streams (2). When you select a GPU, a stand-alone graphics card takes priority (when decoding with NVidia NVDEC chips). If there's no appropriate GPU, the decoding will use the Intel Quick Sync Video technology. Otherwise, CPU resources will be used for decoding.

3. By default, the frame is compressed during the analysis to the specified size (3, default size is 1920 pixels on the larger side). In this case, the following algorithm is used:

   1. If the original resolution on the larger side of the frame is greater than the one specified in the Frame size change field, then it is divided in half.
   2. If the resulting resolution is less than the specified one, then the algorithm stops and this resolution is used.

   3. If the resulting resolution is still greater than the specified one, then it is divided in half until it becomes less.

      For example, the original video resolution is 2048*1536, the specified value is 1000. In this case, the original resolution will be halved 2 times (512*384), because after the first division, the value on the larger side of the frame will be greater than the specified value (1024>1000).

      
      

      To avoid detection errors on streams with a higher resolution, it is recommended that compression be reduced.

      
      

4. Set the frame rate value for the detection tool to process (4). This value should be in the range [0.016, 100]. 

5. By default, the detection tool outputs the Camera. Visitor access in the direction of "Entrance" and Camera. Visitor access in the direction of "Exit" events. If total footfall and visitor number control/exceeding notification is required, do the following:

   1. Select Yes for the People indoor counter parameter (6).

   2. Enter the current number of visitors within the area (5).

   3. Set the threshold value for the Visitors counter; exceeding this limit will generate the corresponding event (7).

6. In the Preview window, set the detection area. It is divided to two sectors, #1 and #2. When an object moves from #2 to #1, the system treats it as entry; alternatively, #1 to #2 is treated as exit.
   To configure the sectors, you can drag them by corners or sides. 

   

   To swap sectors, just click inside one of them.

   To show/hide sectors in the Preview window, click the button.

   
   

7. Click and specify the approximate size of a human. You can do so by dragging the corners of the rectangular area. 

   When specifying the size of a person, consider the Requirements for the person size in the frame.

   

8. Click Apply.

Configuration of the Visitors counter is now complete.