Generalised Hilbert transforms for the estimation of growth direction in coral cores
Marchant, R., and Jackway, P. (2011) Generalised Hilbert transforms for the estimation of growth direction in coral cores. Proceedings of 2011 International Conference on Digital Image Computing: techniques and applications. DICTA 2011 International Conference on Digital Image Computing: techniques and applications , 6-8 December 2011, Noosa, QLD, Australia , pp. 660-665.
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View at Publisher Website: http://dx.doi.org/10.1109/DICTA.2011.117
Measuring coral growth rate is essential for monitoring coral reef health, and part of the process involves directional analysis of x-ray images of coral sections. The monogenic signal is useful for this application as it represents an image in terms of intrinsically-1D feature type (phase), strength (amplitude) and orientation. At certain locations the monogenic signal may give orientation errors, however these can be resolved using higher order generalised Hilbert transforms. We follow this approach, but combine components using a double angle representation as well as the sign of the phase. The improved algorithm is then applied to estimation of growth direction in coral x-ray images. An objective estimation of major growth axis, growth band location, and off axis extension compensation is now possible, and shows the usefulness of 2D analytic signal based image analysis.
|Item Type:||Conference Item (Refereed Research Paper - E1)|
|Keywords:||analytic signals, coral growth, coral reef, directional analysis, feature types, growth axis, growth directions, higher order, Hilbert transform, improved algorithm, monogenic signal, off-axis, orientation error, x-ray image, x ray analysis, estimation|
|FoR Codes:||08 INFORMATION AND COMPUTING SCIENCES > 0801 Artificial Intelligence and Image Processing > 080106 Image Processing @ 100%|
|SEO Codes:||97 EXPANDING KNOWLEDGE > 970101 Expanding Knowledge in the Mathematical Sciences @ 50%|
97 EXPANDING KNOWLEDGE > 970109 Expanding Knowledge in Engineering @ 50%
|Deposited On:||02 May 2012 15:55|
|Last Modified:||02 May 2012 18:01|
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