首先通过计算原始图像和特征灰度图像的分形维数实现第一次的粗分类提取，然后采用多重分形奇异谱方法进一步完成了细分。
At first, the fractal dimension is extracted from the original image and special gray image for the rough classification, and then the multi-fractal dimension is used for further classification.
接下来分析了路面图像的特点，并对原始路面图像进行了必要的预处理，进行灰度校正和几何校正。
Then by analyzing the characteristics of the road surface images, we carry out some necessary preprocesses such as gray scale calibration and geometry calibration to these images.
目前，数字水印技术研究所选取的原始图像仍以灰度图像为主，这样就使得数字水印技术的应用范围受到极大的限制。
The current applied range of digital watermarking technique is limited greatly because the gray value images are widely selected as original images.
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