DEMO: Converting an image profile into time series!

Sometimes, an image may be best thought of as a time series to ease various data mining tasks. The figures below show the time series obtained by converting a local (outer) angle at each and every point x of the image contour, starting from the stem of the leaf or from the neck area of the head profile. The angle is formed by two straight lines from point x-d to point x, and from point x to point x+d, where d is the d^th point forward and backward from the current contour point (along the image contour). In the demo video, this angle is shown by the lines in cyan/turquoise color on the contour (d = 40 for Face Profile, and d = 25 for Leaf Profiles). Note that all the degree values in the time series = raw angle – Pi, that is, if the two lines form a straight line (180 degrees), the value of the time series will be 0. And finally, each time series is z-normalized (mean = 0, standard deviation = 1).

Here’re the THREE animations (AVI movie files) that can be downloaded (may need to save the files first).

· FACE Profile to Time Series

· Maple Leaf to Time Series

· Oak Leaf to Time Series

For related publications in time series data mining (classification, clustering, Dynamic Time Warping (DTW), etc.), please visit my publications page.

For questions, comments or suggestions, email me.

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