关键词: 信息处理技术, 模式识别, 指纹, 纹线距离, 区域分割, 统计窗, 基线

Abstract: On the basis of analysing current methods of ridge distance estimation and not using conventional ideas to estimate ridge distance at a whole or block image, a new method at region level to estimate ridge distance of fingerprint images was put forward. A whole fingerprint image was adaptively partitioned into several regions according to the consistency of ridge directions. Based on binary valued fingerprint image, statistical window and base line of each region were defined. By using distance statistical method at the region unit, average ridge distance was estimated. Experimental results show that this method can reduce the effect of reference minutiae and poor quality image on ridge distance estimation, and the ridge distance estimation results are reliable and invariable to the resolution of image acquisition system.

Key words: information processing technology, pattern recognition, fingerprints, ridge distance, region segmentation, statistical window, base line