Number of criteria evaluations required by OSA as the maximum displacement increased.
MSE values for the three sequences coded using OSA as the displacement increased.
Like both the TDL and TSS-H the Orthogonal Search Algorithm (
OSA) is logarithmic and exhibited similar step like behaviour. Like the TDL and TSS the number of matching criteria evaluations was dependent primarily on the displacement and not the sequence. The behaviour of the MSE was less regular than that of the TDL or TSS. It did not drop to a single minimum and rise continuously, but had several minima. For the Football sequence, for example, the MSE had minima at ±6, ±10 and ±18 pixels, the lowest MSE being at ±6.
[return to
Experiments and Conclusions]
© Colin E. Manning 1996