Compression takes place between frames as well.
Temporal Compression
Although spatial compression removes redundancies from individual frames, there is also a great deal of redundancy from frame to frame. Temporal compression deals with this problem. While a number of approaches and very complicated algorithms are used, let's look at the general concept.
In order to understand how temporal compression works, it might be easier to deal with just two individual frames of video, one right after the other. In the first frame, a race car is speeding around the race track. If we look at the next frame of video, which happens only one one-thirtieth of a second later, the two frames are almost identical. Things have moved a little, but in such a short ...
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