Application of X-ray Computed Tomography to Automatic Wood Testing

Wood has long been an important building material. The wide variety in appearance, strength properties and the possibility of different dimensions are some of the reasons why wood is still very attractive for this purpose. Computed tomography offers great potential for non-destructive testing of the internal structure of wood. In the paper, we apply the computed tomography (CT) technology for log nondestructive testing and calculate the CT number range of different wood tomography slices in statistic method, then the parameters of CT window level and window width in wood testing procedure were set. Because of the linear relationship between wood density and CT number the fitting linear formula between CT number and wood density was calculated. As for the defects in the wood X-ray computed tomography scanning technology is applied to the detection of internal defects for the purpose of obtaining prior information that can be used to arrive at better log sawing decision. A method in wood CT image edge detection of defects based on multifractal theory is applied in the paper.