JP2016153993A - Differential imaging method of seal face - Google Patents
Differential imaging method of seal face Download PDFInfo
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- JP2016153993A JP2016153993A JP2015046389A JP2015046389A JP2016153993A JP 2016153993 A JP2016153993 A JP 2016153993A JP 2015046389 A JP2015046389 A JP 2015046389A JP 2015046389 A JP2015046389 A JP 2015046389A JP 2016153993 A JP2016153993 A JP 2016153993A
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Abstract
Description
本発明は、印鑑の印面を綺麗に電子データ化する方法に関するものである。 The present invention relates to a method for converting a seal surface of a seal into electronic data cleanly.
従来、印面を電子データ化するために、紙に押印した***をスキャナーやカメラで読み取って、電子データ化していた。その後、特許文献１の様に、紙に押印せずに、直接印面をカメラで撮影し、その画像をそのまま、もしくは、２値化して電子データ化するものが発明された。 Conventionally, in order to convert a stamp surface into electronic data, a seal stamped on paper is read with a scanner or a camera and converted into electronic data. Thereafter, as in Patent Document 1, an image was directly invented that was not stamped on paper, but was directly photographed with a camera, and the image was converted into electronic data as it was or binarized.
しかし、印面を直接撮影しても綺麗に印面の画像が取得できないので、特許文献１の様に、特殊なシートを利用して、その上に印面を押し付ける事により、印面画像を鮮明に得ようとすると、利用しているうちに、シートが汚れてきたり、印面に残っていた朱肉がシートに付着したりして、シートの汚れが印面と共に撮影されてしまい、綺麗な印面画像を取得する事が出来なくなってしまうと言う問題があった。 However, since the image of the seal surface cannot be obtained even if the stamp surface is directly photographed, use a special sheet and press the stamp surface on it as in Patent Document 1 to obtain a clear image of the stamp surface. Then, while using the sheet, the sheet becomes dirty, or the vermilion remaining on the stamp surface adheres to the sheet, and the sheet stain is photographed together with the stamp surface, so that a beautiful stamp image is obtained. There was a problem that would be impossible.
そこで、本発明は、印面を押し付けるシートに、朱肉の付着等の汚れが付いたとしても、印面画像を鮮明に取得できる方法を提供する事を目的とする。 Therefore, an object of the present invention is to provide a method capable of clearly obtaining a stamped image even if the sheet pressing the stamped surface is contaminated with vermilion.
請求項１に記載の発明は、印鑑の印面をカメラで撮影して電子データ化する方法であって、その画像は、予め印鑑を用いず、印面を映さない状態で撮影された画像と、印鑑を用いて、印面を映しての画像との両方を比較し、その差分を計算することで得られる画像から、印面の画像を生成する印面撮影方法である。従って、請求項１に記載の発明によれば、印鑑を押し付けるシートが汚れていた場合は、その汚れが映った状態の画像と、汚れと印面が映った状態の画像との差分を計算するので、結果として汚れの分は差分が出ずに、印面の映像だけが差分として現れるので、シートに汚れがあっても、鮮明な印面の画像を得る事が可能となる。 The invention according to claim 1 is a method of photographing a seal surface of a seal with a camera and converting it to electronic data, and the image includes an image captured without using the seal in advance and showing no seal surface, This is a stamp photographing method for generating a stamp image from an image obtained by comparing both with an image showing the stamp and using the difference. Therefore, according to the first aspect of the present invention, if the sheet pressing the seal is dirty, the difference between the image showing the stain and the image showing the stain and the stamp surface is calculated. As a result, there is no difference in the amount of dirt, and only the image of the stamp surface appears as the difference. Therefore, even if the sheet is dirty, a clear image of the stamp surface can be obtained.
請求項２に記載の発明は、前記の差分を利用する印面撮影方法において、外光の影響や、撮影時の僅かなブレ等により、最終的に取得できる画像の鮮明さを低下させる影響を減らすために、差分計算後に得られる画像を２値化することを特徴とする印面撮影方法である。従って、請求項２に記載の発明によれば、カメラで撮影される画像は、例え同じ物を同じ場所から撮影しても、外光の明るさの違いや、ピクセル単位の微妙な撮影位置のブレなどによって、微妙に異なるので、この差分を計算しても真っ白な（差分の無い）画像にはならない、そこで、微妙な違いは、外光の明るさの違いや、ピクセル単位の微妙な撮影位置のブレなどとして無視する為に、差分計算によって得られた画像を、予め実験等によって決められた閾値で２値化する事によって、微妙な違いにより差分が出る事を吸収し、明確な差分だけを抽出し、結果として、鮮明な印面画像を取得することが可能になる。 The invention according to claim 2 reduces the influence of reducing the sharpness of the finally obtainable image due to the influence of external light or slight blurring at the time of photographing in the seal face photographing method using the difference. For this reason, this is a stamp photographing method characterized by binarizing an image obtained after difference calculation. Therefore, according to the second aspect of the present invention, even if the same object is photographed from the same place, the image photographed by the camera is different in the brightness of the external light or the subtle photographing position of the pixel unit. Since it differs slightly due to blurring, etc., even if this difference is calculated, it does not result in a white (no difference) image. Therefore, subtle differences include differences in the brightness of external light and subtle shooting in pixel units. In order to ignore the difference in position, etc., by binarizing the image obtained by the difference calculation with a threshold value determined in advance through experiments, etc., it is possible to absorb the difference caused by subtle differences and to obtain a clear difference. As a result, it becomes possible to acquire a clear stamp image.
請求項１に記載の発明によれば、印面を押し付けるシートが汚れていても、鮮明な印面画像を取得できるので、シートが汚れているかの巡回監視作業や、定期的なシート交換等のメンテナンスが大幅に減少し、シート交換に掛かる経費（材料費や人件費）も大幅に低下する。 According to the first aspect of the present invention, a clear stamp image can be obtained even if the sheet pressing the stamp surface is dirty. Therefore, it is possible to carry out maintenance work such as cyclic monitoring work to check whether the sheet is dirty or periodic sheet replacement. The cost (material cost and labor cost) required for seat replacement will be greatly reduced.
請求項２に記載の発明によれば、請求項１に記載の発明の効果に加え、例えば印鑑をシートの上に押印する為に、印鑑を持った手を翳した影響で外光の量が減り、全体的に暗い画像になってしまい、画像の差異が全体に出てしまったとしても、ある一定の差異より小さい差異は無視されるので、鮮明な印面画像が取得できる。 According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, for example, the amount of external light is reduced due to the influence of the hand holding the seal in order to stamp the seal on the sheet. Even if the overall image becomes dark and the difference between the images appears, the difference smaller than a certain difference is ignored, so that a clear stamp image can be obtained.
以下、本発明を具体化した、第一実施形態を説明する。 Hereinafter, a first embodiment embodying the present invention will be described.
図１、図２に示す様に、まず、押印していない状態で、シートだけの映像（ａ）を撮影する。次に、シートに押印しながら、シートと印面が映った映像を撮影する。前記の映像の差分を計算し、差分画像（ｃ）を生成する。最後に差分画像（ｃ）を２値化して、最終的な印面画像（ｄ）を生成する。 As shown in FIGS. 1 and 2, first, an image (a) of only the sheet is taken without being stamped. Next, an image showing the sheet and the marking surface is taken while impressing the sheet. The difference of the said image | video is calculated and a difference image (c) is produced | generated. Finally, the difference image (c) is binarized to generate a final stamp image (d).
２つの画像の差分を計算する方法としては、例えば背景差分法がある。これは、監視カメラなどの固定されたカメラの映像から動体を検知する場合に利用されている方法である。入力画像と予め撮影された背景画像の差を計算して、入力画像から背景を消し去り、対象物を鮮明化するのである。これを数式で表すと次の様になる。 As a method for calculating the difference between two images, for example, there is a background difference method. This is a method used when a moving object is detected from an image of a fixed camera such as a surveillance camera. The difference between the input image and the previously captured background image is calculated, the background is erased from the input image, and the object is sharpened. This can be expressed as follows:
背景画像（この場合はシートのみの画像）をＩｍａｇｅＢ（ｘ，ｙ）、押印した時の画像（シート＋印面の画像）をＩｍａｇｅＭ（ｘ，ｙ）、その差分画像をＩｍａｇｅＤ（ｘ，ｙ）とすると、
ＩｍａｇｅＤ（ｘ，ｙ）＝ＩｍａｇｅＭ（ｘ，ｙ）−ＩｍａｇｅＢ（ｘ，ｙ）となる。
この時、請求項２に記載の方法により、撮影時の誤差を無くす為に、閾値処理を行い２値化する事を考えると式は次の様になる。
ImageD (x, y) = ImageM (x, y) −ImageB (x, y).
At this time, in consideration of the threshold processing and binarization in order to eliminate the error at the time of photographing by the method described in claim 2, the equation is as follows.
Claims (2)
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62280984A (en) * | 1986-05-30 | 1987-12-05 | Nippon Telegr & Teleph Corp <Ntt> | Seal print intaking method and its device |
| JPH03296873A (en) * | 1990-04-16 | 1991-12-27 | Nippondenso Co Ltd | Fingerprint collating device |
| JP2001521665A (en) * | 1997-04-21 | 2001-11-06 | ディジタル・パソナ・インコーポレーテッド | Fingerprint recognition system |
| JP2009217308A (en) * | 2008-03-07 | 2009-09-24 | Oki Electric Ind Co Ltd | Seal verification device, and seal verification method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62280984A (en) * | 1986-05-30 | 1987-12-05 | Nippon Telegr & Teleph Corp <Ntt> | Seal print intaking method and its device |
| JPH03296873A (en) * | 1990-04-16 | 1991-12-27 | Nippondenso Co Ltd | Fingerprint collating device |
| JP2001521665A (en) * | 1997-04-21 | 2001-11-06 | ディジタル・パソナ・インコーポレーテッド | Fingerprint recognition system |
| JP2009217308A (en) * | 2008-03-07 | 2009-09-24 | Oki Electric Ind Co Ltd | Seal verification device, and seal verification method |
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