Tree ring area measurements using morphological image analysis

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Abstract:

This paper describes a semiautomatic methodology for measuring the areas of annual tree rings. The cross section of a tree stem is first prepared by sanding and dipping into polyethylene glycol to prevent it from cracking. A digital grey-scale image of the resulting stem disk is then acquired by a scanner at the spatial resolution of 600 dots per inch. This image is processed by a series of morphological image processing transformations so as to automatically outline the tree rings. User interaction is restricted to the correction of extraneous or missing boundaries generated by disturbing features such as knots and low-contrast or very narrow rings. The methodology has been developed for Picea abies (L.) Karst., and its applicability to other species is discussed.

Cet article décrit une méthode semi-automatique pour mesurer la surface des cernes annuels. La section radiale de la tige d'un arbre est d'abord sablée et trempée dans le polyéthylène glycol pour prévenir le fendillement. Une image numérique en tons de gris du disque de la tige est ensuite captée à l'aide d'un scanner dont la résolution est de 600 points au pouce. Cette image est traitée à l'aide d'une série de transformations pour le traitement morphologique des images afin de faire ressortir automatiquement les anneaux de croissance. L'utilisateur peut intervenir seulement pour effectuer des corrections dans le cas de cernes manquants ou superflus générés par des caractéristiques qui faussent l'interprétation, telles que les nœuds et les cernes peu contrastés ou très minces. La méthode a été développée pour Picea abies (L.) Karst. et son application à d'autres espèces fait l'objet de la discussion.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: June 1, 2001

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  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
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