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Key frame rate settings

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

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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.
3. Go to the Advanced settings tab on the settings panel of the Camera object.
   
4. Specify the required value of key frame frames rate in the Key frames interval field.
5. Click the Apply button.

Setting the key frame frames rate is complete.

Setting the delta frame creation criterion

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

Processed by this algorithm, the video is the sequence of key and delta frames. A key frame is a full frame of an image. A 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 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 value, the block is considered to have fixed motion , and becomes a part of a delta frame. Otherwise, the block is considered to have no motion, and it isn't included in the delta frame.

Legitimate values of pixel block brightness are in the range from 0 to 225. The block becomes a part of 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 the value of this parameter allows reducing the size of the delta frame and, hence, the size of the video stream, by reducing the number of pixel blocks in the delta frame. Note that the blocks with useful motion data now are more likely to be excluded from the processed video, which consequently leads to video degradation. Reducing the value of the parameter that sets the criterion for including blocks in a delta frame allows improving the video quality by increasing its size.

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