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Table of Contents



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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 is not isn't compressed when it is displayed on the Monitor video surveillance monitor of the Serverserver.

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

Video Set the video compression rate is configured for each camera individually.

Axxon PSIM™ system PSIM uses the Quality setting for 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 value of the Discwrite quality (analog camera) parameter is sufficient.

Info
titleNote

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
    2. dialog box (1)
  2. window.
  3. Select the Camera object
    4. ,
  4. created before
    5. , corresponding to the camera to be adjusted,
  5. in the objects tree
    6. of the Hardware tab (2). The settings panel for the selected object is displayed on the right of the Hardware tab.
  6. , which corresponds to the adjusted camera.
  7. Select
    8. Go to
  8. the Basic settings tab on the settings panel of the Camera object
    9. (3)
  9. .
    Image Modified
    10. If it is necessary to

  10. To improve the video quality, move the

    11. Quality

  11. Discwrite quality (analog camera) slider to the

    12. Max (4).
    If it is necessary to

  12. max position. To reduce the size of the video stream coming from the camera, move the

    13. Quality slider

  13. Discwrite quality (analog camera) slider to the

    14. Min

  14. min.

    Info
    titleNote
    15. .
  15. Use the
    16. viewing field
  16. video surveillance area to estimate the video quality enhancement or degradation.
  17. Click the Apply button
    18. (5)
  18. .

...

Setting the key frame rate

...

Axxon PSIM™ software PSIM 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 which that differ from the previous key frame.

The Motion Wavelet algorithm guarantees consistency of a frame video quality regardless of the key frame rate. With an increase of in motion intensity in a the frame, the size of the delta frame is also increased increases, and the quality of the video does not changeremains 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 PSIM sets the optimal key frame rate value by default: every eighth The best value of frame rate is set by default in Axxon PSIM™ software: every 8th frame is processed as a the key frame. If there are no special requirements to for the video size and quality, it is recommended to keep 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
    2. dialog box (1)
  2. window.
  3. Select the Camera object
    4. ,
  4. created before
    5. , corresponding to the camera to be adjusted,
  5. in the objects tree
    6. of the Hardware tab (2). The settings panel for the selected object is displayed on the right of the Hardware tab.
  6. , which corresponds to the adjusted camera.
  7. Select
    8. Go to
  8. the Advanced settings tab on the settings panel of the Camera object
    9. (3)
  9. .
    Image Modified
    10. Specify
  10. In the Key frames interval field, specify the required value of the key frame rate
    11. in the Key frames interval field (4)
  11. .
  12. Click the Apply button
    13. (5)
  13. .

Key Setting the key frame rate is now configuredcomplete.

Setting the delta frame

...

generation criterion

Axxon PSIM™ software uses PSIM 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 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 which that differ from the previous key frame. To You can compare the pixel blocks of a the key frame to those of the frame next to that follows the key frame, one by comparing the average brightness of these blocks is compared. If the difference in brightness exceeds a preset the set value, it means that the motion is detected in the block is considered to have fixed motion, and it 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 is not included into isn't included in the delta frame.

Legitimate The legitimate values of pixel block brightness lie within 0-225 range. The block becomes a part of are in the range from 0 to 225. 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 7 seven units. If this value is increased, you increase the value of this parameter, it allows reducing the size of the delta frame is decreased, and and, hence, the size of the video stream size is consequently decreased, as a delta frame now contains less pixel blocks, by reducing the number of pixel blocks 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 and consequently there is , which consequently leads to video degradation. So, by reducing If you reduce the value of the parameter setting that sets the criterion for blocks to be included into a including blocks in the delta frame, you may improve the image while building up it allows improving the video quality by increasing its size.

The best optimal value of the parameter , which that sets the criterion for blocks to be included into a including blocks in the delta frame , is defined determined by the brightness gradient of the video background and the moving objects in a frame: with the frame. You can increase the parameter value at a high gradient and decrease the parameter may be increased; with value at a low gradient the parameter value is to be decreased.

Info
titleNote.

The Estimate motion parameter is ignored by the Motion Wavelet 7.1 and Motion Wavelet 7.1 Intr compressors.

To change the value of the parameter , which that sets the criterion for the block to be included into a delta frameincluding blocks of pixels in delta frames, do the following:

  1. Go to the Hardware tab in the System settings
    2. dialog box (1)
  2. window.
  3. Select the Camera object
    4. ,
  4. created before
    5. , corresponding to the camera to be adjusted,
  5. in the objects tree
    6. of the Hardware tab (2). The settings panel for the selected object is displayed on the right of the Hardware tab.Go to
  6. , which corresponds to the adjusted camera.
  7. Select the Advanced settings tab on the settings panel of the Camera object
    8. (3)
  8. .
    9. Image RemovedSpecify the
  9. In the Estimate motion field, specify the required value of the parameter
    10. , which
  10. that sets the criterion for
    11. the block to be included into the delta frame, into the Estimate motion field (4)
  11. including blocks of pixels in delta frames.
  12. Click the Apply button
    13. (5)
  13. .

Delta frames Setting the delta frame generation criterion is now setcomplete.