FOURIER TRANSFORM METHODS IN IMAGE ANALYSIS OF COMPRESSION WOOD AT THE CELLULAR LEVEL

Compression wood affects the overall quality of construction timber and paper quality. We have investigated the microscopic features of lumen shape and tracheid shape for compression wood studies and detection in softwoods. In this paper, we describe a method for directly analyzing tracheid and lumen shape over an entire image. The method uses the Fast Fourier Transform (FFT) and reduces the two-dimensional image data to one-dimensional data, from which lumen and tracheid shape can be evaluated. We illustrate the method by comparison of compression wood images to normal wood images. The results of detecting severe compression wood were successful, while the detection of weak compression wood was not satisfactory.

[1]  Robert Evans,et al.  Rapid Measurement of the Transverse Dimensions of Tracheids in Radial Wood Sections from Pinus radiata , 1994 .

[2]  N. O. Fuentes,et al.  A new surface characterization technique: RIMAPS (Rotated Image with Maximum Average Power Spectrum) , 2002, Journal of microscopy.

[3]  Adya P. Singh,et al.  Lignin distribution in mild compression wood of Pinus radiata , 1999 .

[4]  Rafael C. González,et al.  Local Determination of a Moving Contrast Edge , 1985, IEEE Transactions on Pattern Analysis and Machine Intelligence.

[5]  Gabriella Sanniti di Baja.  Well-Shaped, Stable, and Reversible Skeletons from the (3, 4)-Distance Transform , 1994, J. Vis. Commun. Image Represent..

[6]  L. Donaldson,et al.  COMPARISON OF SEGMENTATION METHODS FOR DIGITAL IMAGE ANALYSIS OF CONFOCAL MICROSCOPE IMAGES TO MEASURE TRACHEID CELL DIMENSIONS , 2001 .

[7]  T. E. Timell.  Compression Wood in Gymnosperms , 1986 .

[8]  William H. Press,et al.  The Art of Scientific Computing Second Edition , 1998 .

[9]  H. Saiki,et al.  Characterization of Cell Arrangement by Polar Coordinate Analysis of Power Spectral Patterns. , 1993 .

[10]  Jan Nyström,et al.  Image based methods for nondestructive detection of compression wood in sawn timber , 1999 .

[11]  C. Andersson,et al.  Classification of compression wood using digital image analysis , 1995 .

[12]  R. Jagels,et al.  Morphometric analysis applied to wood structure. I: Cross sectional all shape and area change in red spruce , 2007 .

[13]  T. Furuno,et al.  Quantitative morphological evaluation of cross-sectional vessel shapes in hardwoods using image processing , 1997 .

[14]  H. Saiki,et al.  Characterisation of vessel distribution by Fourier transform image analysis. , 1996 .

[15]  G. Borgefors,et al.  An image analysis method to measure cross-sectional tracheid dimensions on softwood increment cores , 2001 .

[16]  Takeshi Furuno,et al.  Digital image analysis of cross-sectional tracheid shapes in Japanese softwoods using the circularity index and aspect ratio , 1999, Journal of Wood Science.