Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unsupervised Threshold for Automatic Extraction of Dolphin Dorsal Fin
  Outlines from Digital Photographs in DARWIN (Digital Analysis and Recognition
  of Whale Images on a Network)   At least two software packages---DARWIN, Eckerd College, and FinScan, Texas
A&M---exist to facilitate the identification of cetaceans---whales, dolphins,
porpoises---based upon the naturally occurring features along the edges of
their dorsal fins. Such identification is useful for biological studies of
population, social interaction, migration, etc. The process whereby fin
outlines are extracted in current fin-recognition software packages is manually
intensive and represents a major user input bottleneck: it is both time
consuming and visually fatiguing. This research aims to develop automated
methods (employing unsupervised thresholding and morphological processing
techniques) to extract cetacean dorsal fin outlines from digital photographs
thereby reducing manual user input. Ideally, automatic outline generation will
improve the overall user experience and improve the ability of the software to
correctly identify cetaceans. Various transformations from color to gray space
were examined to determine which produced a grayscale image in which a suitable
threshold could be easily identified. To assist with unsupervised thresholding,
a new metric was developed to evaluate the jaggedness of figures ("pixelarity")
in an image after thresholding. The metric indicates how cleanly a threshold
segments background and foreground elements and hence provides a good measure
of the quality of a given threshold. This research results in successful
extractions in roughly 93% of images, and significantly reduces user-input
time.

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The categories of this paper are: stat
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The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
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The categories of this paper are: plasm-ph
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The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
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The categories of this paper are: cond-mat
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The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: nlin