Use the digital image processing method to describe the microstructure characteristics of different geotechnical materials. Firstly, the microstructure images of different geotechnical materials were obtained by Charged Coupled Device (CCD) camera and long distance microscope. Secondly, the clear parts of the same geotechnical material image which were taken at the same point but different focus were obtained by technology of multi-resolution wavelet transform in digital image processing method and combined to get a high definition image. And then the high definition images were enhanced by histogram equalization process to highlight the contrast ratio. Finally, the images were divided according to the threshold which was automatically extracted by the maximum deviation to extract the microstructure parameters of geotechnical material. After processing images of different geotechnical materials, it shows that the digital image processing technology which is studied could well apply to describe the microstructure characteristics of different geotechnical materials.
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