Abstract
In this paper, we will introduce a simple digital camera system which judges degree of rock weathering and displays the results as contour images.
Through color information analyses of digital images of drilled core samples and adit walls combined with physical property tests, β -values: intercepts of regression lines on Green-Red plane obtained by the distribution of color vectors, were revealed to have clear correlative relation to the degrees of weathering and physical properties such as specific gravity and water absorption of the studied samples, and turned out to be suitable for an index of weathering degree.
In the said system we developed, digital images of excavated rock surfaces, such as tunnel face images took by ordinary digital camera are divided into many small analysis masks and β-values of the masks are obtained, then colored contour images of the β-values corresponding to the original digital pictures are drawn up and displayed. As we set up the colors of the contour image reflecting on color information of actual weathered rocks, the achieved contour images became similar to geological sketches and easy to be understood.
