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Setting the compression rate

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The image is compressed to reduce the size of the video stream. Video isn't compressed when it is displayed on the video surveillance monitor of the server.

An If you increase in the compression rate, it leads to video degradation. Axxon PSIM software PSIM compresses video right after it is digitized by the video capture card before recording and/or transmitting it via the network to the Remote Workstationsremote workstations.

Set the video compression rate for each camera individually.

Axxon PSIMsoftware uses the Quality setting for uses the reverse Discwrite quality (analog camera) parameter for setting the compression rate parameter, which is reverse to the compression rateof the video signal.

In most cases, the default Quality setting is sufficient.value of the Discwrite quality (analog camera) parameter is sufficient.

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The Discwrite quality (analog camera) parameter works only for analog cameras.

If you want to change the compression rate of the videoTo change the video compression rate, do the following:

1. Go to the Hardware tab in the System settings window.
2. Select the Camera object created before in the objects tree, which corresponds to the adjusted camera.
Go to
3. Select the Basic settings tab on the settings panel of the Camera object.
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4. To improve the video quality, move the

Recording

5. Discwrite quality (analog camera) slider to the max position. To reduce the size of the video stream coming from the camera, move the

Recording quality slider

6. Discwrite quality (analog camera) slider to the min.

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   Use the

viewing field

7. video surveillance area to estimate the video quality enhancement or degradation.

8. Click the Apply button.

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Setting the key frame rate

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Axxon PSIMsoftware uses the Motion Wavelet algorithm for video processing and compression. Processed The video that is processed by this algorithm , the video is the sequence of key and delta frames. A The key frame is a full frame of an image. A The delta frame (differential frame) is an image containing only pixel blocks that differ from the previous key frame.

The Motion Wavelet algorithm guarantees consistency of video quality regardless of the key frame rate. With an increase in motion intensity in a the frame, the size of the delta frame increases, and the quality of the video remains unchanged. With very intense motion (more than 70% of the frame is engaged), the setting of the key frame rate is ignored, and every each frame is processed as a the key frame. 

Axxon PSIMsoftware sets the optimal key frame rate value by default: every eight eighth frame is processed as a the key frame. If there are no special requirements to for the video size and quality, we recommend keeping the default key frame rate.

To change the key frame rate, do the following:

1. Go to the Hardware tab in the System settings window.
2. Select the Camera object created before in the objects tree, which corresponds to the adjusted camera.
Go to
3. Select the Advanced settings tab on the settings panel of the Camera object.
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Specify
4. In the Key frames interval field, specify the required value of the key frame rate
in the Key frames interval field
5. .
6. Click the Apply button.

Setting the key frame rate is complete.

Setting the delta frame

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generation criterion

Axxon PSIMsoftware uses  uses the Motion Wavelet algorithm for video processing and compression.

The video that is processed Processed by this algorithm , the video is the sequence of key and delta frames. A The key frame is a full frame of an image. A The delta frame (differential frame) is an image containing only pixel blocks that differ from the previous key frame. You can compare the pixel blocks of a the key frame to the frame that follows the key one , by comparing the average brightness of these blocks. If the difference in brightness exceeds a preset the set value, it means that the block is considered to have fixed motionmotion is detected in the block, and this block becomes a part of a the delta frame. Otherwise, the block is considered to have it means that there is no motion in the block, and it isn't included in the delta frame.

Legitimate The legitimate values of pixel block brightness are in the range from 0 to 225. The block becomes a part of By default, the block is included in the delta frame , by default, if the difference between its average brightness in the current frame and in the previous key frame exceeds seven units. Increasing If you increase the value of this parameter, it allows reducing the size of the delta frame and, hence, the size of the video stream, by reducing the number of pixel blocks in that form the delta frame. Note that blocks containing the blocks with useful motion data in the frame now are more likely to be excluded from the processed video, which consequently leads to video degradation. Reducing If you reduce the value of the parameter that sets the criterion for including blocks in a the delta frame, it allows improving the video quality by increasing its size.

The optimal value of the parameter that sets the criterion for including blocks in a the delta frame is defined determined by the brightness gradient of the video background and moving objects in a the frame. You can increase the parameter value with at a high gradient and decrease the parameter value with at a low gradient.

To change the value of the parameter that sets the criterion for including blocks of pixels in delta frames, do the following:

1. Go to the Hardware tab in the System settings window.
2. Select the Camera object created before in the objects tree, which corresponds to the adjusted camera.
Go to
3. Select the Advanced settings tab on the settings panel of the Camera object.
4. In the Estimate motion field, specify the required value of the parameter that sets the criterion for including blocks of pixels in delta frames.
5. Click the Apply button.

Setting the delta frames frame generation criterion is complete.