13.07.2015 Views

View - Statistics - University of Washington

View - Statistics - University of Washington

View - Statistics - University of Washington

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

••••8Figure 2.1(a) is a simulation <strong>of</strong> such an image, and Figure 2.1(b) shows the featuresdetected by our method.•• •••• • ••• • •••••• • •• ••••• •••• • • • •••••• •• ••• • ••• • • ••• •••••••••• ••• •• •••• •• •• • •••••• • ••• ••••••••••• ••••••••• •••••• ••••• •••• • • •• • • •• •••••• •• • • •••• • •• •••••• ••• • • • • • ••••••• ••••••••• • ••• ••• • • ••••• • ••••••• •••••••••••• ••• ••• •••••••••••• • • •• ••• • •• •• ••••• • • •••• • • • • •• •••• • ••• •••• • •• • ••• ••••• ••• •••• • •• ••••••• ••• ••••••••• •••••• •••• • •• ••(a)(b)Figure 2.1: (a) Simulated minefield with noise. (b) Final result.In Section 2.2, we give some background on principal curves and introduce ourprobability model and clustering algorithm. Section 2.2.3 presents our methodfor clustering on open principal curves, and Section 2.2.4 describes our use <strong>of</strong>approximate Bayes factors to choose the number <strong>of</strong> features and the amount <strong>of</strong>smoothing simultaneously and automatically. Initialization methods, including ourhierarchical principal curve clustering (HPCC) algorithm, are discussed in Section2.3. Examples are presented in Section 2.4, and in Section 2.5 we discuss otherapproaches and areas <strong>of</strong> further work.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!