X射线图像法测定木材生长轮密度

A Measurement Method of Wood Growth Ring Density Based on X-Ray Combined Image Processing

提出X射线图像法测定木材生长轮密度和生长轮宽度的一种新方法,应用自编的软件,对图像进行预处理,获取其灰度值,根据图像的灰度值与穿透物材料密度的线性关系直接测定物体微密度,并与微密度测量仪测定结果进行对比。结果表明:X射线图像法与仪器法相比,平均密度误差为0.45%,相关系数为0.9664;生长轮宽度误差为0.34%,相关系数为0.9962,显著度密切相关。图像法测量生长轮密度和生长轮宽度是可行的,对于生长轮界限不明显的木材,图像法更优。

A new method of measuring wood growth ring density and growth width was produced with X-ray combind image processing in this paper. First gray-scale of X-ray image was got by the software developed ourselves and pretreated the image, then micro-density was measured directly by applying the linear relationship between gray scale and penetrate material density and contrasted with the result of microdensitometer in order to validate the correctness. The results indicate that the average error of the density values is 0.45%, correlation coefficient is 0.966 4; the error of the width of growth ring is 0.34%, correlation coefficient is 0.996 2, they are high correlation. X-ray combined image processing can be used to measure the density and the width of wood growth ring. X-ray image is a new way of measure technique of wood＇ s micro-density and it is better than microdensitometer ragure growth ring.