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出願の表示

1. US20090123040 - Fingerprint image background detection apparatus and detection method

官庁
アメリカ合衆国
出願番号 11994220
出願日 30.06.2006
公開番号 20090123040
公開日 14.05.2009
特許番号 08385612
特許付与日 26.02.2013
公報種別 B2
IPC
G06K 9/00
G物理学
06計算;計数
Kデータの認識;データの表示;記録担体;記録担体の取扱い
9印刷されたまたは手書きされた文字を読取るまたは認識するため,またはパターン,例.指紋,を認識するための方法または装置
出願人 Tatara Tetsuo
NEC Corporation
発明者 Tatara Tetsuo
代理人 Dickstein Shapiro LLP
優先権情報 2005-192025 30.06.2005 JP
発明の名称
(EN) Fingerprint image background detection apparatus and detection method
要約
(EN)

Even if streak-like noise or streaks caused by dragging which can be hardly distinguished from upheaval lines exist, background regions and impressing regions are separated from each other without being affected by existence of streaks. A fingerprint image background detection apparatus which discriminates background regions and impressing regions in an input fingerprint image includes impressing feature extraction means 22 which finds a pixel value variation quantity in a direction parallel to streak-like noise or streaks caused by dragging every small region obtained by dividing the input fingerprint image, tentative impressing region decision means 23 which judges impressing regions by comparing a pixel value variation quantity of every small region found by the impressing feature extraction means with a threshold, and impressing region shaping means 24 which shapes the impressing regions judged by the tentative impressing region decision means to obtain a convex shaped figure and obtains regions other than the impressing regions as background regions.