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Axxon PSIM software package components that are used for configuring video capture cards can give additional ADC resources to one or more cameras , and thus increase the frame rate of the video signal from these cameras. At the same time, the frame rate of the video signal from other cameras decreases.
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To do this, place the selected camera in the priority process queue.
An example of the reallocation of resources of one ADC between cameras is shown in the figure below.
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Operation modes of the video capture cards’ ADC
ADC operation mode is defined determined by the number of processed and digitized video signals. There are two modes:
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With default settings, you can receive digitized video signals with frame rates that are of 2 FPS in PAL format and 2.5 FPS in NTSC format.
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- Switch off the Camera objects that correspond to the idle video channels. This allows allocating the resources between working cameras only, thus increasing the frame rate of their video signals.
- Change frame grooming.
- Reallocate cameras on the ADC of the video capture card.
- Reallocate resources of one ADC between cameras (priority process queues).
In most cases, 1 and 2 setting steps are sufficient to set the frame rate. 3 3 and 4 setting steps are necessary only with high frame rate requirements to for one or more cameras.
Configuring video subsystem with disabled video channels
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To disable the Camera objects that correspond to the idle video channels in Axxon PSIM, do the following:
- Define Determine the numbers of the idle video capture channels (taking into account BNC plug numbering).
- Go to the Hardware tab in the System settings window.
- In the object tree on the Hardware tab, select the Camera object created before, with the same channel number as the BNC plug (idle channel). The settings panel for the selected object is displayed on the right of the Hardware tab.
- Make sure that video signal isn't displayed in the video surveilance surveillance window (1).
The display of the video signal in the video field indicates that the Camera object matches another video channel. - Specify the number of the video channel in the Channel number drop-down list on the Basic settings tab (2). Match the Camera object with the channel number, which corresponds to the BNC plug number and the Camera object number, or scan for a Camera object matched with the required channel number.
- Set the Disable checkbox (3).
- Click the Apply button.
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Actual frame rate
We recommend defining determining the actual frame rate of video signal digitization and then setting up the frame rate for video signals from video surveillance system cameras.
You must perform frame rates rate setup if frame rates of video signals from one or more cameras don't meet the requirements.
Actual frame rates are defined determined for each camera individually.
To define specify the actual frame rate for a selected camera, do the following:
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Changing frame decimation
By default, Axxon PSIM digitizes video signals with the frame rate lower than the maximum allowed one. This is caused by the following:
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Before reallocating cameras beteen between ADCs of the video capture card, disable the the Camera objects corresponding to disabled cameras (see Configuring video subsystem with disabled video channels section).
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Initial data. The card has four ADCs. They are matched to four Video capture device objects in the objects object tree. The video capture card may have up to 16 cameras connected to it. Eight cameras are actually connected to the video capture card. The objects matched to the remaining eight cameras are disabled. Each of the two ADCs, matched to the Video capture device 1 and Video capture device 2 objects, is configured to digitize the signals from four cameras. The ADCs matched to the Video capture device 3 and Video capture device 4 objects aren't configured to digitize signals from any cameras. An example of the objects object tree is given in figure A:
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- Select the Camera 1 object in the objects tree. The settings panel for the selected object is displayed.
- Select Video capture device 3 in the Video capture device list.
- Click the Apply button.
- The Camera 1 object moves to the child branch of the Video capture device 3 object (B).
- Repeat 1-4 1–4 steps for the Camera 3 and Camera 4 objects.
- Select the Video capture device 1 object in the objects tree.
- Make sure that the Rate slider is in the max position.
If the Rate slider is in the max position, then setup is completed.
If the Rlate Rate slider is in another position, move it to the max position and do 8-10 8–10 steps. - Click the Apply button.
- Close the System settings window and restart Axxon PSIM.
- The frame rate of the selected camera increases up to the Real time rate (for information on testing the frame rate change, see Actual frame rate).
- If the number of connected cameras doesn't allow setting up digitization of video signal from one of the cameras with the Real time rate (for example, when 15 out of 16 allowed cameras are connected) or if it is necessary to increase the frame rate of several cameras simultaneously to the rate lower than the Real time one, the allocation of cameras between ADCs is performed as follows: the cameras for which it is necessary to increase the frame rate are allocated between ADCs in the number less than the maximum allowable one. The frame rate is increased by as many times as the number of cameras on ADC is reduced.
Allocation of the video capture card's resources is complete.
Example 2. Configuring video signal digitization from two cameras with an increased frame rate
Task. Video signal signals on Camera 1 and Camera 5 must be digitized with an increased frame rate.
Initial data. The card has four ADCs. They are matched to four Video capture devicesdevice objects in the objects object tree. The video capture card may have up to 16 cameras connected to it. 12 cameras are actually connected to the video capture card. The objects matched to the remaining four cameras are disabled. Each of the three ADCs, matched to the Video capture device 1, Video capture device 2 and , and Video capture device 4 objects, is configured to digitize the signals from four cameras. The ADC, matched to the Video capture device 3 object, isn't configured to digitize the signals from any camera. An example of the objects object tree is given in figure A.
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- Select the Camera 1 object in the objects tree. The settings panel for the selected object is displayed.
- Select the Video capture device 3 value from the Video capture device list.
- Click the Apply button.
- The Camera 1 object moves to the child branch of the Video capture device 3 object (B);.
- Repeat 1-4 1–4 steps for the Camera 5 object.
- The frame rate on Camera 1 and Camera 5 increases twofold (for information on testing the frame rate change, see the Actual frame rate section).
- Click the Apply button.
Allocation of the video capture card's resources is complete.
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Example 1. The ADC is configured to digitize video signal signals from four cameras.
If all the cameras have a common queue, the ADC digitizes video signals in the following sequence:
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Example 2. The ADC is configured to digitize the video signal signals from three cameras.
If all the cameras have a common queue, the ADC digitizes video signals in the following sequence:
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Example 3. The ADC is configured to digitize video signal signals from four cameras.
If all the cameras have a common queue, the ADC digitizes video signals in the following sequence:
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Example 4. The ADC is configured to digitize video signal signals from four cameras.
If all the cameras have a common queue, the ADC digitizes video signals in the following sequence:
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