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出願の表示

1. CN101253536 - Fingerprint image background detecting device and detecting method

官庁
中華人民共和国
出願番号 200680031642.1
出願日 30.06.2006
公開番号 101253536
公開日 27.08.2008
特許番号 101253536
特許付与日 13.10.2010
公報種別 B
IPC
G06T 7/00
G物理学
06計算;計数
Tイメージデータ処理または発生一般
7イメージ分析
CPC
G06V 40/1335
G06V 40/1359
G06V 40/1347
出願人 Nippon Electric Co.
日本电气株式会社
発明者 Tatara Tetsuo
多田罗哲夫
代理人 zhujin gui
中科专利商标代理有限责任公司 11021
優先権情報 192025/2005 30.06.2005 JP
発明の名称
(EN) Fingerprint image background detecting device and detecting method
(ZH) 指纹图像背景检测设备及方法
要約
(EN) Even if a streaklike noise hard to distinguish from a ridge or a streak produced by a dragged finger is present, a fingerprint area and the background area are separated without the influence of their presence. A fingerprint image background detecting device for distinguishing the background area from the fingerprint area in an inputted fingerprint image comprises fingerprint feature extracting means (22) for determining the variation of the values of pixels parallel to the direction of a streaklike noise or a streak produced by a dragged finger for each of small areas into which the inputted fingerprint image is divided, temporary fingerprint area judging means (23) for judging whether or not each small area is a fingerprint area by comparing the variation of the pixel values of the small area determined by the fingerprint feature extracting means (22) with a threshold , and fingerprint area shaping means (24) for shaping the fingerprint area judged by the temporary fingerprint area judging means (23) into a convex figure and determining the areas other than the fingerprint areas as the background areas.
(ZH)

即使存在很难与隆起线区分开的通过拖动所产生的条状噪声或条纹,也可以将背景区域与印压区域彼此分开,而不受条纹存在的影响。用于判别输入指纹图像中的背景区域与印压区域的指纹图像背景检测设备包括:印压特征提取装置22,在通过划分所述输入指纹图像所获得的每个小区域中发现在与通过拖动所产生的条状噪声或条纹平行的方向上的像素值变化量;初步印压区域判决装置23,用于通过将由所述印压特征提取装置所发现的每个小区域的像素值变化量与阈值进行比较来判定印压区域;以及印压区域成形装置24,用于使由所述初步印压区域判决装置所判定的印压区域成形,以获得凸形图,以及用于获得除了印压区域以外的区域作为背景区域。