Peter Kootsookos (@kootsoop)

Peter Kootsookos has worked in a mixture of academic research and commercial interests in Australia, Ireland, and the United States. His DSP interests are in estimation, filtering and extraction of information from images and video.

Deesspee #5

Peter Kootsookos ● September 16, 2009●1 comment

Peter Kootsookos's Deesspee #5 is a very short micro-post simply titled "Computers". It acts as a minimalist flag in the Deesspee series pointing readers toward the computing topic on DSPRelated; click through to view the original entry and any context or discussion. This compact post is useful if you track the author's brief topic markers or short-format updates.

The Nature of Circles

Peter Kootsookos ● February 21, 2009●3 comments

Averaging angles the usual way can produce nonsense: the mean of 0 and 359 degrees is not 179.5 when working with circular data. Peter Kootsookos shows the correct approach using vectorial or phasor averaging, converting angles to unit complex numbers and taking the argument of their sum. The short post points to directional statistics and a related IEEE paper for deeper details.

Correlation without pre-whitening is often misleading

Peter Kootsookos ● February 18, 2008●9 comments

Correlation, as one of the first tools DSP users add to their tool box, can automate locating a known signal within a second (usually larger) signal. The expected result of a correlation is a nice sharp peak at the location of the known signal and few, if any, extraneous peaks.

A little thought will show this to be incorrect: correlating a signal with itself is only guaranteed to give a sharp peak if the signal's samples are uncorrelated --- for example if the signal is composed...

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