A machine vision based approach for timber knots detection

Mohamad Mazen Hittawe; Désiré Sidibé; Fabrice Mériaudeau

doi:10.1117/12.2182770

30 April 2015 A machine vision based approach for timber knots detection

Mohamad Mazen Hittawe, Désiré Sidibé, Fabrice Mériaudeau

Proceedings Volume 9534, Twelfth International Conference on Quality Control by Artificial Vision 2015; 95340L (2015) https://doi.org/10.1117/12.2182770
Event: The International Conference on Quality Control by Artificial Vision 2015, 2015, Le Creusot, France

Abstract

Wood singularities detection is a primary step in wood grading enhancement. Our approach is purely machine vision based. The main objective is to compute physical properties like density, modulus of elasticity (MOE) and modulus of rupture (MOR) given wood surface images. Knots are one of the main singularities which directly affect the wood strength. Hence, our target is to detect knots and classify them into transverse and non-transverse ones. Then the Knots Depth Ratio (KDR) is computed based on all found transverse knots. Afterwards, KDR is used for the wood mechanical model improvement. Our technique is based on colour image analysis where the knots are detected by means of contrast intensity transformation and morphological operations. Then KDR computations are based on transverse knots and clear wood densities. Finally, MOE and MOR are computed using KDR images. The accuracy of number of knots found, their locations, MOE and MOR has been validated using a dataset of 252 images. In our dataset, these values were manually calculated. To the best of our knowledge our approach is the first purely machine vision based method to compute KDR, MOE and MOR.

Citation Download Citation

Mohamad Mazen Hittawe, Désiré Sidibé, and Fabrice Mériaudeau "A machine vision based approach for timber knots detection", Proc. SPIE 9534, Twelfth International Conference on Quality Control by Artificial Vision 2015, 95340L (30 April 2015); https://doi.org/10.1117/12.2182770

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