JP2002133422A - Automatic detecting device for inclination of image - Google Patents
Automatic detecting device for inclination of imageInfo
- Publication number
- JP2002133422A JP2002133422A JP2000330807A JP2000330807A JP2002133422A JP 2002133422 A JP2002133422 A JP 2002133422A JP 2000330807 A JP2000330807 A JP 2000330807A JP 2000330807 A JP2000330807 A JP 2000330807A JP 2002133422 A JP2002133422 A JP 2002133422A
- Authority
- JP
- Japan
- Prior art keywords
- image
- mask pattern
- inclination
- inspection
- calculating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- Image Analysis (AREA)
Abstract
Description
【０００１】[0001]
【発明が属する技術分野】本発明はスキャナー等の画像
読取り装置を使った画像検査装置において自動的に画像
の傾き量を計算し補正する技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for automatically calculating and correcting the amount of tilt of an image in an image inspection apparatus using an image reading device such as a scanner.
【０００２】[0002]
【従来の技術】従来、画像の傾きを算出する手段として
は、画像の４隅または３隅に位置検出用の基準画像（以
下、トンボ）を形成し、トンボの位置を見て画像の傾き
を算出していた。第5図にその例を示す。2. Description of the Related Art Conventionally, as means for calculating the inclination of an image, a reference image (hereinafter referred to as a register mark) for position detection is formed at four or three corners of the image, and the inclination of the image is determined by observing the position of the register mark. Was calculated. Fig. 5 shows an example.
【０００３】[0003]
【０００４】[0004]
【発明が解決しようとする課題】しかし、検査したい画
像にはトンボを持たない画像がたびたび発生し、自動検
査が実現できなかった。または、自動的に傾きを判断す
る手段が存在したかもしれないが、処理速度と精度の問
題からから実用レベルには達していなかった。However, an image to be inspected often has no registration mark, and automatic inspection cannot be realized. Alternatively, there may have been means for automatically judging the inclination, but it has not reached a practical level due to problems in processing speed and accuracy.
【０００５】本発明では傾きを持つマスクパターンを設
け、マスクパターン上に画像が存在する頻度を計算して
頻度が最も小さい場合のマスクパターンの傾きと画像の
傾きが同じと判断する手段を設ける。In the present invention, a mask pattern having an inclination is provided, and a means is provided for calculating the frequency at which an image is present on the mask pattern and determining that the inclination of the mask pattern is the same as the inclination of the image when the frequency is the lowest.
【０００６】本発明では、傾きを持つマスクパターンを
設けて傾き検査用の画像との相関を算出する事で、高速
で精度の高い画像の傾きを自動で算出及び補正する装置
を実現出来た。According to the present invention, a device for automatically calculating and correcting a high-speed and high-precision image inclination can be realized by providing a mask pattern having an inclination and calculating a correlation with an image for inclination inspection.
【実施例】本発明の実施例の構成図を第１図に示す。１
は傾きを持つマスクパターンである。２は検査画像であ
る。マスクパターンは、第2図に示すように予想される
画像の傾き量を網羅できるように用意する。ある傾きの
マスクパターンで２の検査画像上にマスクパターンを矢
印の方向に１画素ずつ滑らせていく。各位置において、
マスクパターン上の画像が存在する場合は、頻度データ
に＋１をする。ない場合は加算しない。この様にして画
像の先端から画像の後端までマスクパターンを滑らせて
頻度の合計を算出する。これに依りある画像に対してあ
る傾き（マスクパターン）における頻度（一致率）が求
まった事になる。ここで検査画像の特性について説明す
る。本発明で、検査の対象とする画像は横書きの文書画
像及び文章に画像が含まれている場合である。こういう
画像の特徴は水平方向に画像が並んでいるという事であ
る。本発明では、検査画像のこの特徴を利用して、傾き
を持つマスクパターンを提案し、マスクパターンと検査
画像との関係を調べて傾き量を計算している。第3図に
本発明の適用例を示す。横軸はマスクパターンの傾き量
を表す。縦軸は上記説明のように各マスクパターンに対
して、画像が存在する頻度をしめす。マスクパターンの
傾きと検査画像の傾きが一致しているほど頻度は小さく
なる。いろいろな画像で検討した結果、第3図において
頻度が３回続けて上がり続けるか同じ値を持つ場合に、
傾きが一致したと判断すればいい事が判った。ここでは
３回と言ったが回数はマスクパターンの作り方や検査対
象画像の特徴によることは言うまでもない。第４図に縦
書きの画像の場合を示す。これは第１図に対してマスク
パターンが９０度傾いている事が判る。こうすれば縦書
き画像でも同様に入力画像の傾きが自動に判断する事が
出来る事は容易に推測できる。傾き量が判ったらそれを
補正する方法は複数提案されている。本発明の主眼は傾
き量の自動算出にあり補正についての説明は本明細書で
は割愛する。FIG. 1 is a block diagram showing an embodiment of the present invention. 1
Is a mask pattern having an inclination. 2 is an inspection image. The mask pattern is prepared so as to cover the expected amount of tilt of the image as shown in FIG. The mask pattern is slid one pixel at a time in the direction of the arrow on the two inspection images with the mask pattern having a certain inclination. At each position,
If there is an image on the mask pattern, +1 is added to the frequency data. If not, do not add. In this way, the mask pattern is slid from the leading edge of the image to the trailing edge of the image to calculate the total frequency. This means that the frequency (coincidence rate) of a certain image at a certain inclination (mask pattern) has been obtained. Here, the characteristics of the inspection image will be described. In the present invention, an image to be inspected is a horizontally written document image and a case where an image is included in a sentence. The feature of such an image is that the images are arranged in the horizontal direction. In the present invention, a mask pattern having an inclination is proposed using this characteristic of the inspection image, and the amount of inclination is calculated by examining the relationship between the mask pattern and the inspection image. FIG. 3 shows an application example of the present invention. The horizontal axis represents the amount of tilt of the mask pattern. The vertical axis indicates the frequency at which an image exists for each mask pattern as described above. The frequency decreases as the inclination of the mask pattern matches the inclination of the inspection image. As a result of examining various images, if the frequency continues to increase three times or has the same value in Fig. 3,
It turns out that it is only necessary to judge that the inclinations match. Here, the number of times is three, but it goes without saying that the number of times depends on the method of forming the mask pattern and the characteristics of the inspection target image. FIG. 4 shows a case of a vertically written image. This indicates that the mask pattern is inclined by 90 degrees with respect to FIG. In this way, it can be easily guessed that the inclination of the input image can be automatically determined in the vertical writing image. If the amount of inclination is known, a plurality of methods for correcting it are proposed. The focus of the present invention is on the automatic calculation of the tilt amount, and the description of the correction is omitted in this specification.
【発明の効果】以上説明したように、本発明の画像傾き
検出装置は、高速で高い信頼性を持ち入力画像の傾きを
算出できる事が可能になった。本発明は各種の画像の検
査装置において高い効果を発生する。ＯＣＲや印刷物の
検査装置等で有効である。As described above, the image inclination detecting apparatus of the present invention can calculate the inclination of an input image at high speed and with high reliability. The present invention produces high effects in various image inspection apparatuses. It is effective in an OCR or a printed matter inspection device.
【００００７】[0000]
【図１】本発明の中心であり、マスクパターンと検査画
像の関係を示す。FIG. 1 is the center of the present invention and shows the relationship between a mask pattern and an inspection image.
【図２】マスクパターンの説明図FIG. 2 is an explanatory diagram of a mask pattern.
【図３】本発明の適用例FIG. 3 is an application example of the present invention.
【図４】縦書きの画像に対するマスクパターンと検査画
像の関係。FIG. 4 shows a relationship between a mask pattern and an inspection image for a vertically written image.
【図５】傾きの補正手段の例FIG. 5 shows an example of a tilt correcting unit.
【００００８】[0108]
【符号の説明】 １ マスクパターン ２ 検査画像[Description of Signs] 1 Mask pattern 2 Inspection image
【００００９】[0000]
─────────────────────────────────────────────────────
────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成１３年２月５日（２００１．２．５）[Submission date] February 5, 2001 (2001.2.5)
【手続補正２】[Procedure amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】図面の簡単な説明[Correction target item name] Brief description of drawings
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明の中心であり、マスクパターンと検査画
像の関係を示す。FIG. 1 is the center of the present invention and shows the relationship between a mask pattern and an inspection image.
【図２】マスクパターンの説明図FIG. 2 is an explanatory diagram of a mask pattern.
【図３】本発明の適用例FIG. 3 is an application example of the present invention.
【図４】縦書きの画像に対するマスクパターンと検査画
像の関係。FIG. 4 shows a relationship between a mask pattern and an inspection image for a vertically written image.
【図５】傾きの補正手段の例FIG. 5 shows an example of a tilt correcting unit.
【符号の説明】 １ マスクパターン ２ 検査画像[Description of Signs] 1 Mask pattern 2 Inspection image
Claims (4)
査装置において、該入力画像に対して自動的にその傾き
量を算出する機能を有し、該傾き量算出手段として、マ
スクパターンを設け、該マスクパターンの傾きを変化さ
せて、該入力画像との間の一致率を算出し、該一致率を
もって該入力画像の傾き量を算出する事を特徴とする画
像検査装置。An image inspection apparatus for inputting an image and performing a predetermined inspection has a function of automatically calculating a tilt amount of the input image, and a mask pattern is used as the tilt amount calculating means. An image inspection apparatus, comprising: changing a tilt of the mask pattern, calculating a coincidence rate with the input image, and calculating a tilt amount of the input image using the coincidence rate.
をもつ１ラインの線分とし、該マスクパターンを該入力
画像に沿って移動させ、各位置において該マスクパター
ン上に画像が存在する場合を１として、存在しない場合
を０として、該検査画像全体における該マスクパターン
上に画像が存在するライン数の総計を算出し、該総計値
が最も小さな値であるマスクパターンをもって傾き量と
する事を特徴とする画像検査装置。2. The method according to claim 1, wherein the mask pattern is a line segment having one inclination, the mask pattern is moved along the input image, and an image is present on the mask pattern at each position. Assuming that the number of lines where an image exists on the mask pattern in the entire inspection image is calculated as 1 and the total number of lines where the image exists on the mask pattern in the entire inspection image is set as 0, and that the mask pattern having the smallest total value is used as the inclination amount Characteristic image inspection device.
さな値のマスクパターンを選択する方法として所定回数
連続して該総計値が増えた場合は、該マスクパターンの
傾き量の変化方向と該入力画像の傾きが逆であると判断
し、所定回数連続して該総計値が減少した場合は、該マ
スクパターンの傾き量の変化方向と該入力画像の傾きが
同じであると判断する事を特徴とする画像検査装置。3. The method according to 1 or 2, wherein the total value increases continuously for a predetermined number of times as a method of selecting a mask pattern having the smallest total value. If the inclination of the input image is determined to be opposite and the total value decreases continuously for a predetermined number of times, it is determined that the direction of change in the amount of inclination of the mask pattern and the inclination of the input image are the same. An image inspection apparatus characterized by the above-mentioned.
入力画像に対して、該マスクパターンの傾きを９０度切
り換える事を特徴とする画像検査装置。4. The image inspection apparatus according to claim 1, wherein the inclination of the mask pattern is switched by 90 degrees with respect to the input image written horizontally or vertically.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000330807A JP2002133422A (en) | 2000-10-30 | 2000-10-30 | Automatic detecting device for inclination of image |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000330807A JP2002133422A (en) | 2000-10-30 | 2000-10-30 | Automatic detecting device for inclination of image |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002133422A true JP2002133422A (en) | 2002-05-10 |
Family
ID=18807259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000330807A Pending JP2002133422A (en) | 2000-10-30 | 2000-10-30 | Automatic detecting device for inclination of image |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002133422A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006222878A (en) * | 2005-02-14 | 2006-08-24 | Konica Minolta Business Technologies Inc | Image processor, image processing method and image processing program |
-
2000
- 2000-10-30 JP JP2000330807A patent/JP2002133422A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006222878A (en) * | 2005-02-14 | 2006-08-24 | Konica Minolta Business Technologies Inc | Image processor, image processing method and image processing program |
| JP4552681B2 (en) * | 2005-02-14 | 2010-09-29 | コニカミノルタビジネステクノロジーズ株式会社 | Image processing apparatus, image processing method, and image processing program |
| US7925115B2 (en) | 2005-02-14 | 2011-04-12 | Konica Minolta Business Technologies, Inc. | Image processing device capable of detecting and correcting inclination of image |
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