JP4519940B2 - 標識認証システム及び標識認証方法 - Google Patents
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- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
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Description
以下のようにして印刷した模擬紙幣についての認証試験を行った。印刷用のインクには、略球形の色材粒子を含有するインクを用いた。図1は、この発明の実施例としての標識認証システム1の構成を示すブロック図である。この標識認証システム1は、スキャナー2、コンピュータ3、プリンター4、CRT5及びキーボード6から構成されている。
紙幣の登録は、図2に示すフローチャートに従って、以下のように行われる。
まず、登録を受けようとする紙幣をスキャナー2にセットし、メッシュ区分ごとの色情報として印刷面の読み取りを2回以上行う(ステップS1)。このステップS3が読取工程である。ここで、スキャナー2は、XY配列のメッシュで区分けされた光反応素子によって、このメッシュ区分の大きさに応じた光学解像度で色情報を取得し、記憶部3bに保存する。一方、インクの色材粒子は、メッシュ区分の大きさよりも小さいため(例えば、スキャナー2が600dpiの解像度で色情報を取得する場合には、メッシュ区分は一辺が42.3μmとなり、色材粒子よりも大きくなる)、メッシュ区分内にあるいくつかの色材粒子の色組成は、ある単色のRGB値としてピクセルカラー化される。こうしてピクセルカラー化されたメッシュを変色クラスタと定義する。スキャンは複数回行われるため、印刷面に対するスキャン毎のメッシュ区分の区切り方の相違により、ピクセルカラー値がスキャン毎に変化する。図3に、印刷面に対するピクセルカラー化の様子を示した模式図を示す。そして、用いた印刷装置固有の登録番号をキーボード6から入力し、記憶部3bに保存する(ステップS2)。以上のステップ1〜3の工程のイメージを図4に示す。
上記のようにして行われた紙幣の認証は、図6に示すフローチャートに従って以下のように行われる。
まず、認証を行おうとする紙幣に付された暗号コード及び印刷装置固有の登録番号の少なくとも一方をキーボード6から入力する(ステップS20)。そして、その紙幣をスキャナー2にセットし、紙幣の印刷面のメッシュ区分ごとの色情報の読み取りを2回以上行う(ステップS21)。読み取り方法はステップS1と同様である。そして、位置補正を行い(ステップS22)、各メッシュ毎のピクセルカラー値の変化量を求め(ステップS23)、色変化暗号形状を生成し(ステップS24)、暗号コードを生成する(ステップS25)。ステップS22〜S25は、前述したステップS3〜S6と同様であり、説明を省略する。
Claims (9)
- 認証対象を該認証対象の画素よりも大きいメッシュに分割して該メッシュ区分ごとの色情報を前記メッシュ区分を変化させて2回以上読み取る読取手段と、
前記読み取り手段により読み取るごとに、前記メッシュ区分の各々の色情報から該メッシュ区分を変化させたことに起因して生じる色情報の変化に基づいて複数個の特徴点を抽出して記憶する特徴点抽出手段と
を備えることを特徴とする認証システム。 - 前記認証対象は、色材粒子が含有されているインクによって形成されており、
前記メッシュ区分の大きさは、該インクに含有されている該色材粒子の大きさよりも大きく、
前記特徴点抽出手段は、該メッシュ区分を変化させたときに該色材粒子の立体的な分布位置に起因して前記読み取るごとに生じる色情報の変化に基づいて特徴点を求めることを特徴とする請求項1に記載の認証システム。 - さらに、抽出された特徴点から認証用の暗号を生成する暗号生成手段を備えることを特徴とする請求項1または2に記載の認証システム。
- 前記暗号生成手段は、前記特徴点同士を結ぶ位置ベクトルに基づいて認証用の暗号を生成することを特徴とする請求項3に記載の認証システム。
- 前記特徴点抽出手段は、標識の複数回の読取に対して位置ずれの程度を反映しながら位置合わせを行うための位置補正手段を備えていることを特徴とする請求項1乃至4のいずれかに記載の認証システム。
- 認証対象を該認証対象の画素よりも大きいメッシュに分割して該メッシュ区分ごとの色情報を前記メッシュ区分を変化させて2回以上読み取る読取ステップと、
前記読み取りステップにより読み取るごとに、前記メッシュ区分の各々の色情報から該メッシュ区分を変化させたことに起因して生じる色情報の変化に基づいて複数個の特徴点を抽出して記憶する特徴点抽出ステップと
を備えることを特徴とする認証方法。 - 前記特徴抽出ステップは、前記読取ステップの解像度に依存することなく前記認証対象の特徴を抽出することを特徴とする請求項6記載の認証方法。
- さらに、前記抽出された特徴点から認証用の暗号を生成する暗号生成を備えることを特徴とする請求項7記載の認証方法。
- 前記認証用の暗号は、認証を行う前記認証対象を付するために用いた認証対象付着ステップを示す暗号を含むことを特徴とする請求項8記載の認証方法。
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US (1) | US8265381B2 (ja) |
EP (2) | EP1919184A4 (ja) |
JP (2) | JP4961564B2 (ja) |
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- 2006-07-25 EP EP12155828.2A patent/EP2495689B1/en not_active Not-in-force
- 2006-07-25 WO PCT/JP2006/314652 patent/WO2007013444A1/ja active Application Filing
- 2006-07-25 JP JP2007528472A patent/JP4961564B2/ja active Active
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US20080205766A1 (en) | 2008-08-28 |
EP1919184A4 (en) | 2011-08-24 |
HK1174418A1 (en) | 2013-06-07 |
JPWO2007013444A1 (ja) | 2009-02-05 |
JP4961564B2 (ja) | 2012-06-27 |
US8265381B2 (en) | 2012-09-11 |
JP2009290878A (ja) | 2009-12-10 |
EP2495689B1 (en) | 2014-10-22 |
EP2495689A1 (en) | 2012-09-05 |
EP1919184A1 (en) | 2008-05-07 |
WO2007013444A1 (ja) | 2007-02-01 |
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