continuous directional image 连续方向图
eight-directional image 遍历八方向
roundness directional image 圆形方向图
After many algorithms are compared, several algorithms including segmentation, directional image, binarization and thinning are selected and simulated. The fingerprint image preprocessing is effective.
本文在前人工作的基础上，完成了如下工作： (1)通过比较多种预处理算法，本文选择并实现了指纹图像分割、求方向图、二值化和细化算法，构成了一个完整、快速、高效的预处理过程。
参考来源 - 指纹图像的特征提取与匹配·2,447,543篇论文数据，部分数据来源于NoteExpress
We propose a fingerprint coding algorithm based on directional image, EZW and MRWD algorithm.
在深入研究EZW和MRWD方法基础上，提出了一种结合指纹方向图的指纹压缩算法。
Firstly gain the continuously directional image of the fingerprint, secondly design orientation template using the directional image and filter the fingerprint image, lastly obtain the binary image.
先得到指纹图像的连续方向图，再根据此方向图设计方向滤波模板进行滤波，最后得到指纹的二值化图像。
The preprocessing in an automatic fingerprint identification system usually includes five steps: normalization, directional graph computation, image segmentation, filtering and binarization.
指纹预处理一般包括规格化、方向图计算、图像分割、滤波、二值化等环节，该文系统地讨论了各环节的有效算法。
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