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Uses of SAD
Maikmerten (talk | contribs) (Definition of SAD) |
Maikmerten (talk | contribs) (Uses of SAD) |
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Wikipedia has a [http://en.wikipedia.org/wiki/Sum_of_absolute_differences nice article on SAD]. | Wikipedia has a [http://en.wikipedia.org/wiki/Sum_of_absolute_differences nice article on SAD]. | ||
== Uses of SAD == | |||
A major use case for SAD is [http://en.wikipedia.org/wiki/Motion_estimation motion estimation], which is an integral part of most video compression schemes. Instead of transmitting complete frames, video codecs usually try to copy similar frame data from previously transmitted frames. The positions from which to copy parts of a previous frame are coded as [http://en.wikipedia.org/wiki/Motion_vector motion vectors]. This works well, as in video sequences most objects can be found in several consecutive frames, albeit they may have moved. | |||
SAD is often used to determine these motion vectors. | |||