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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.

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