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Temporal Dependency Results

To investigate temporal redundancy each of the sequences was coded using the same algorithms used to test spatial redundancy. Instead of beginning the search at the centre of the search area, the algorithms used the motion vector of the block at the same position in the previous frame.
Temporal Dependency of this type improved the performance of the Cross Search Algorithm when coding the Tennis Sequence but not the other sequences.


Football Sequence - TDB

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Performance of Independent algorithms compared to Dependent algorithms when coding the Football sequence.


Garden Sequence - TDB

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Performance of Independent algorithms compared to Dependent algorithms when coding the Garden sequence.

As the graphs above illustrate, temporal redundancy of the kind investigated failed to assist the block matching algorithms in finding blocks more economically. Some temporally dependent algorithms coded the Garden sequence using fewer criteria evaluations than their independent counterparts, but the resulting sequences were of lower quality. However they were not unreasonably lower.


Tennis Sequence - TDB

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Performance of Independent algorithms compared to Dependent algorithms when coding the Garden sequence.




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© Colin E. Manning 1996