The whole process is the morphology processing based on the gray-level image and binary mask, and is simple and easy to implement.
整个过程基本是对灰度图像和二值模板的形态处理，简单易行。
The original gray level image was changed into the macroscopical drawing information by pre-processing, threshold selection, image bivalency, edge detection and contour extraction and segmentation.
对原始数字图像实施预处理、二值化、轮廓提取及细化等处理后，将图像信息转变成宏观图形信息。
This paper presents an algorithm which directly computes the direction image on the gray level images. Experimental results show that it is feasible for fingerprint processing.
该文介绍了一种直接利用指纹灰度信息进行指纹图像方向图计算的方法，实验结果表明，它是行之有效的。
Image preprocessing: the image is processed by several algorithms including gray level stretch, homomorphic processing and image smoothing, and then the quality of image gets better.
图像预处理：采用灰度变换、同态滤波和平滑等方法对图像进行处理，提高了图像的质量。
Image preprocessing: the image is processed by several algorithms including gray level stretch, homomorphic processing and image smoothing, and then the quality of image gets better.
图像预处理：采用灰度变换、同态滤波和平滑等方法对图像进行处理，提高了图像的质量。
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