... Atlantic Ridge 大西洋海岭; 大西洋之脊 收藏 ridge frequency 脊线频率; 纹线频率; 指纹频率; 纹路频率 收藏 pseudo structural ridge 构造脊假象 收藏 ...
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A method for ridge orientation acquirement is improved, and the orientation map is more accurate. A method for ridge frequency acquirement is improved, and the false ridge lines are avoided.
首先对纹线方向提取方法进行了改进，获得了较准确的方向图；然后对纹线频率的提取方法进行了改进，有效地避免了Gabor滤波后在脊线中留下伪纹线和小孔的问题。
参考来源 - 指纹识别算法研究These algorithms include orientation extraction, estimation of ridge frequency, circular Gabor filter, binarization and thinning.
包括方向图提取、脊线频率估算、圆形Gabor滤波、二值化、细化。
参考来源 - 低质量指纹图像预处理算法研究与应用·2,447,543篇论文数据，部分数据来源于NoteExpress
For calculating the frequency variance, a new method was proposed to calculate the ridge frequency.
为计算频率偏差，提出了一种新的频率计算方法。
We also improve on the binarization method of fingerprint images based on the 2nd derivative by the orientation and ridge frequency of the images.
在方向图和脊线频率的基础上，实现了一种基于脊线方向分析的方法对指纹图象进行二值化；
We also improve on the binarization method of fingerprint images based on the 2~(nd) derivative by the orientation and ridge frequency of the images.
在方向图和脊线频率的基础上，实现了基于二阶导数的指纹图像二值化算法；
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