Abstract:

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.

Key words: X-ray combined image processing, growth ring density, image processing, gray-scale