JP2878772B2 - Optical character reader - Google Patents
Optical character readerInfo
- Publication number
- JP2878772B2 JP2878772B2 JP2083226A JP8322690A JP2878772B2 JP 2878772 B2 JP2878772 B2 JP 2878772B2 JP 2083226 A JP2083226 A JP 2083226A JP 8322690 A JP8322690 A JP 8322690A JP 2878772 B2 JP2878772 B2 JP 2878772B2
- Authority
- JP
- Japan
- Prior art keywords
- character
- similarity
- candidate
- knowledge
- dictionary
- 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.)
- Expired - Lifetime
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- Character Discrimination (AREA)
Description
【発明の詳細な説明】 ［発明の目的］ （産業上の利用分野） 本発明は、光学的文字読取装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial application field) The present invention relates to an optical character reading device.
（従来の技術） 従来から、光学的文字読取装置では、文字認識によっ
て得た文字候補のマトリックスから、知識辞書内の単語
情報を用いて知識処理を行うことにより最終的な認識結
果を得ている。(Prior Art) Conventionally, in an optical character reader, a final recognition result is obtained by performing knowledge processing using a word information in a knowledge dictionary from a matrix of character candidates obtained by character recognition. .
この知識処理において、文字認識により第１候補とし
て得た文字が、知識処理の結果他の文字と置き代えられ
た場合、表示画面上においてその文字は、例えば高輝度
あるいはカラーにより他の文字と区別して表示され、こ
れにより変換箇所の確認をオペレータに促すようになさ
れている。In this knowledge processing, when a character obtained as a first candidate by character recognition is replaced with another character as a result of the knowledge processing, the character is distinguished from other characters on the display screen by, for example, high brightness or color. This is displayed separately, thereby prompting the operator to confirm the conversion location.
しかしながら、知識処理において文字候補のマトリッ
クスに対応する単語候補が知識辞書から得られなかった
場合、つまり知識候補無しの場合は、表示画面において
第１候補の文字列が素読み文字として単一色で表示され
るだけであるため、どの文字が誤読の可能性が高いのか
を一目で判断することが困難であった。したがって、効
率良く誤読箇所の修正を行うことができなかった。However, when the word candidate corresponding to the matrix of the character candidates is not obtained from the knowledge dictionary in the knowledge processing, that is, when there is no knowledge candidate, the character string of the first candidate is displayed on the display screen as a plain reading character in a single color. It is difficult to determine at a glance which character has a high possibility of misreading. Therefore, it was not possible to efficiently correct a misread portion.
（発明が解決しようとする課題） 本発明はこのような課題を解決するためのもので、知
識処理において、文字候補のマトリックスに対応する単
語候補が知識辞書から得られなかった場合に、各行の第
１文字候補を識別できるようそれぞれ妥当性に応じて表
示することにより、誤読の可能性が高い文字候補を一目
で判断することのできる光学的文字読取装置の提供を目
的としている。(Problem to be Solved by the Invention) The present invention is intended to solve such a problem. In the knowledge processing, when a word candidate corresponding to a matrix of character candidates is not obtained from the knowledge dictionary, each line is deleted. An object of the present invention is to provide an optical character reading device that can display a first character candidate according to validity so as to be identified so that a character candidate having a high possibility of misreading can be determined at a glance.
［発明の構成］ （課題を解決するための手段） 本発明の光学的文字読取装置は上記目的を達成するた
めに、帳票に記された文字のパターンをイメージデータ
として読込むイメージ読込手段と、各カテゴリの標準パ
ターンが予め格納された認識辞書と、イメージ読込手段
より読込まれた文字パターンと認識辞書内の各標準パタ
ーンとを照合して類似度を求め、これらの類似度に基づ
いて複数の文字候補を判定する文字認識手段と、この文
字認識手段により得られた各文字候補の類似度を保持す
る類似度保持手段と、認識辞書内の各カテゴリについて
の類似度分布が予め格納された類似度分布格納手段と、
知識情報として単語が予め格納された知識辞書と、文字
認識手段により得た文字候補のマトリックスから知識辞
書を用いて知識処理を行う知識処理手段と、知識処理に
おいて文字候補のマトリックスに対応する単語候補が知
識辞書から得られなかった場合、行毎に、最も類似度の
高い第１文字候補の妥当性を、類似度保持手段に保持さ
れた類似度と類似度分布格納手段に格納された該当する
カテゴリの類似度分布とから判定する文字候補妥当性判
定手段と、その判定結果に基づき、各行の第１文字候補
を識別できるようにそれぞれ妥当性に応じて表示するよ
う制御を行う表示制御手段とを具備したものである。[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, an optical character reading device of the present invention comprises: image reading means for reading a character pattern written on a form as image data; A recognition dictionary in which standard patterns of each category are stored in advance, a character pattern read by an image reading unit and each standard pattern in the recognition dictionary are compared to obtain similarities, and a plurality of similarities are obtained based on these similarities. Character recognition means for determining a character candidate, similarity holding means for holding the similarity of each character candidate obtained by the character recognition means, and similarity distribution in which the similarity distribution for each category in the recognition dictionary is stored in advance. Degree distribution storage means;
A knowledge dictionary in which words are stored in advance as knowledge information, knowledge processing means for performing knowledge processing using a knowledge dictionary from a matrix of character candidates obtained by character recognition means, and word candidates corresponding to the matrix of character candidates in the knowledge processing Is not obtained from the knowledge dictionary, the validity of the first character candidate having the highest similarity is determined for each line by the similarity stored in the similarity storage unit and the corresponding similarity stored in the similarity distribution storage unit. Character candidate validity determination means for determining from the similarity distribution of the category, and display control means for performing control to display the first character candidates in each line according to the validity so that the first character candidates in each line can be identified based on the determination result. It is provided with.
（作用） 本発明の光学的文字読取装置では、文字認識手段によ
り得られた各文字候補の類似度を類似度保持手段に保持
しておき、知識処理において、文字候補のマトリックス
に対応する単語候補が知識辞書から得られなかった場合
に、文字候補妥当性判定手段は、行毎に、最も類似度の
高い第１文字候補の妥当性を、類似度保持手段に保持さ
れた類似度と類似度分布格納手段に格納された該当する
カテゴリの類似度分布に基づき判定する。そして表示制
御手段は、その判定結果に基づき、各行の第１文字候補
を識別できるようにそれぞれ妥当性に応じて表示するよ
う制御を行う。(Operation) In the optical character reading apparatus of the present invention, the similarity of each character candidate obtained by the character recognition means is stored in the similarity holding means, and the word candidate corresponding to the matrix of character candidates is stored in the knowledge processing. Is not obtained from the knowledge dictionary, the character candidate validity determining unit determines, for each line, the validity of the first character candidate having the highest similarity and the similarity held in the similarity holding unit and the similarity. The determination is made based on the similarity distribution of the corresponding category stored in the distribution storage means. Then, based on the determination result, the display control means performs control such that the first character candidates in each line are displayed according to their validity so as to be identified.
したがって、この発明によれば、知識処理において、
文字候補のマトリックスに対応する単語候補が知識辞書
から得られなかった場合に、各行の第１文字候補を識別
できるようそれぞれ妥当性に応じて表示することによ
り、誤読の可能性が高い文字候補を一目で判断すること
ができる。Therefore, according to the present invention, in the knowledge processing,
When a word candidate corresponding to a matrix of character candidates is not obtained from the knowledge dictionary, character candidates having a high possibility of misreading are displayed by displaying each of the first character candidates in each line according to the validity so that the first character candidate can be identified. It can be determined at a glance.
（実施例） 以下、本発明の実施例を図面に基づいて説明する。(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
第１図は本発明に係る一実施例の光学的文字読取装置
の構成を説明するためのブロック図である。FIG. 1 is a block diagram for explaining the configuration of an optical character reading device according to one embodiment of the present invention.
同図において、１は帳票に記された文字のパターンを
イメージデータとして読込むイメージ読込部、２は各カ
テゴリ（文字）の標準パターンが格納された認識辞書、
３はイメージ読込部１より読込まれた文字パターンと認
識辞書２に格納された各標準パターンとを複合類似度法
等によりマッチングして、類似度の高い上位所定数の文
字候補を判定する文字認識部である。また、４は文字認
識で得た各文字候補についての類似度が一時的に保持さ
れる類似度保持部、５は予め多数の文字パターンを入力
して文字認識を行うことにより収集された各カテゴリの
類似度分布の上限値および下限値が格納された類似度分
布格納部である。さらに６は認識情報として単語が格納
された知識辞書、７は文字認識部３により得られた文字
候補のマトリックスから知識辞書６を検索して、最終的
な文字認識結果を得る知識処理部、８は知識処理におい
て、文字候補のマトリックスに対応する単語候補が知識
辞書６から得られなかった場合（知識候補無しの場
合）、マトリックスの行毎に、最も類似度の高い第１文
字候補の妥当性を、類似度保持部４に保持された類似度
と類似度分布格納部５に格納された該当するカテゴリの
類似度分布に基づき判定する文字候補妥当性判定部、９
は各種の表示を行う表示部、10は文字候補妥当性判定部
８の判定結果に基づき、各行の第１文字候補をそれぞれ
の妥当性に応じて予め定義されたカラーで表示するよう
制御を行う表示制御部である。In FIG. 1, reference numeral 1 denotes an image reading unit that reads a character pattern written on a form as image data, 2 denotes a recognition dictionary in which standard patterns of each category (character) are stored,
Reference numeral 3 denotes character recognition for matching a character pattern read from the image reading unit 1 with each standard pattern stored in the recognition dictionary 2 by a composite similarity method or the like to determine a predetermined number of character candidates having a high similarity. Department. Reference numeral 4 denotes a similarity holding unit for temporarily holding the similarity of each character candidate obtained by character recognition, and 5 denotes each category collected by inputting a large number of character patterns in advance and performing character recognition. Is a similarity distribution storage unit in which the upper limit value and the lower limit value of the similarity distribution are stored. Further, 6 is a knowledge dictionary in which words are stored as recognition information, 7 is a knowledge processing unit that searches the knowledge dictionary 6 from a matrix of character candidates obtained by the character recognition unit 3 and obtains a final character recognition result, 8 In the knowledge processing, when a word candidate corresponding to a matrix of character candidates is not obtained from the knowledge dictionary 6 (when there is no knowledge candidate), the validity of the first character candidate having the highest similarity is determined for each row of the matrix. Is determined based on the similarity held in the similarity holding unit 4 and the similarity distribution of the corresponding category stored in the similarity distribution storage unit 5, 9.
Is a display unit that performs various displays, and 10 is based on the determination result of the character candidate validity determination unit 8, and controls to display the first character candidate in each line in a predefined color according to each validity. It is a display control unit.
次にこの実施例装置において代表される動作を第２図
および第３図を用いて説明する。尚、ここでは、入力文
字パターンとして「オウメ」を読込んだ場合を例にとり
説明する。Next, an operation typified by this embodiment will be described with reference to FIGS. 2 and 3. FIG. Here, a case where “Oume” is read as an input character pattern will be described as an example.
まずイメージ読込部１により帳票に記された文字のパ
ターンをイメージデータとして読込み、この文字パター
ンを文字認識部３に送る。First, the image reading unit 1 reads a character pattern written on a form as image data, and sends this character pattern to the character recognition unit 3.
すると、文字認識部３は、入力文字パターンと認識辞
書２内の各標準パターンとを複合類似度法等によりマッ
チングしてそれぞれの類似度を算出し、類似度の高い上
位所定数の文字候補群を文字認識結果として知識処理部
７に渡すとともに、その類似度を類似度保持部４に保存
する。Then, the character recognizing unit 3 calculates the similarity by matching the input character pattern with each standard pattern in the recognition dictionary 2 by the complex similarity method or the like, and determines a predetermined number of character candidate groups having high similarity. To the knowledge processing unit 7 as a character recognition result, and the similarity is stored in the similarity holding unit 4.
この後、知識処理部７は、受取った文字候補群をマト
リックス状に組合せ、このマトリックスで知識辞書６の
検索を行うことにより最終的な文字認識結果を判定す
る。Thereafter, the knowledge processing unit 7 determines the final character recognition result by combining the received character candidate groups in a matrix and searching the knowledge dictionary 6 with the matrix.
ところで、上述の知識処理において、文字候補のマト
リックスに対応する単語候補が知識辞書６から得られな
かった場合（知識候補無しの場合）、文字候補妥当性判
定部８および表示制御部10は次のような処理を行う。By the way, in the above-described knowledge processing, when a word candidate corresponding to a matrix of character candidates is not obtained from the knowledge dictionary 6 (when there is no knowledge candidate), the character candidate validity determination unit 8 and the display control unit 10 perform the following. Such processing is performed.
第３図に示すように、まず文字候補妥当性判定部８
は、類似度保持部４に保存された各行の第１文字候補の
類似度に着目し、その類似度が、類似度分布格納部５に
格納された該当するカテゴリの類似度分布における上限
値および下限値の間に存在するか否かを判断する（ステ
ップＡ）。As shown in FIG. 3, first, the character candidate validity determination unit 8
Focuses on the similarity of the first character candidate of each line stored in the similarity holding unit 4, and the similarity is determined by the upper limit value and the upper limit in the similarity distribution of the corresponding category stored in the similarity distribution storage unit 5. It is determined whether or not it exists between the lower limits (step A).
この結果、例えば「ア」の文字の場合のように、第１
文字候補の類似度が類似度分布における上限値および下
限値間に存在しないことが判断された場合、文字候補妥
当性判定部８は、誤読の可能性が大であることを判断
し、当該文字候補にその判定結果を示す情報を付加して
これを表示制御部10に送る（ステップＢ）。As a result, as in the case of the character “A”, for example,
When it is determined that the similarity of the character candidate does not exist between the upper limit and the lower limit in the similarity distribution, the character candidate validity determination unit 8 determines that the possibility of misreading is large, and Information indicating the determination result is added to the candidate, and the information is sent to the display control unit 10 (step B).
この後、表示制御部10は、付加情報に基づき例えば赤
のカラーを設定し（ステップＣ）、このカラーで、表示
部９の画面上に当該文字候補を表示する（ステップ
Ｄ）。Thereafter, the display control unit 10 sets, for example, a red color based on the additional information (step C), and displays the character candidate on the screen of the display unit 9 in this color (step D).
また、例えば「ウ」や「メ」の文字の場合のように、
ステップＡにおいて、第１文字候補の類似度が、該当す
るカテゴリの類似度分布における上限値および下限値間
に存在することが判断された場合、文字候補妥当性判定
部８は、第１文字候補と第２文字候補との間に所定の値
（ここでは0.01）以上の類似度差があるか否かを判断す
る（ステップＥ）。Also, for example, as in the case of the characters "U" and "Me",
In step A, when it is determined that the similarity of the first character candidate exists between the upper limit and the lower limit in the similarity distribution of the corresponding category, the character candidate validity determination unit 8 sets the first character candidate It is determined whether there is a similarity difference equal to or more than a predetermined value (here, 0.01) between the second character candidate and the second character candidate (step E).
ここで、「ウ」と「ワ」の文字の場合のように、第１
文字候補と第２文字候補との類似度の差が所定の値以下
と判断された場合、文字候補妥当性判定部８は、正誤不
明と判断し、第１文字候補にその判定結果を示す情報を
付加してこれを表示制御部10に送る（ステップＦ）。Here, as in the case of the characters “U” and “W”, the first
When it is determined that the similarity difference between the character candidate and the second character candidate is equal to or less than a predetermined value, the character candidate validity determination unit 8 determines that the correctness is unknown and information indicating the determination result is included in the first character candidate. Is sent to the display controller 10 (step F).
これにより表示制御部10は、付加情報に基づき例えば
黄のカラーを設定し（ステップＣ）、このカラーで、表
示部９の画面上に当該文字候補を表示する（ステップ
Ｄ）。Accordingly, the display control unit 10 sets, for example, a yellow color based on the additional information (step C), and displays the character candidate on the screen of the display unit 9 in this color (step D).
また、「メ」と「ナ」の文字の場合のように、第１文
字候補と第２文字候補との類似度の差が所定の値以上と
判断された場合、文字候補妥当性判定部８は、正読の可
能性が大と判断し、第１文字候補にその判定結果を示す
情報を付加してこれを表示制御部10に送る（ステップ
Ｇ）。When the difference between the similarity between the first character candidate and the second character candidate is determined to be equal to or greater than a predetermined value, as in the case of the characters “me” and “na”, the character candidate validity determination unit 8 Determines that the possibility of correct reading is high, adds information indicating the determination result to the first character candidate, and sends the information to the display control unit 10 (step G).
これにより表示制御部10は、付加情報に基づき例えば
青のカラーを設定し（ステップＣ）、このカラーで、表
示部９の画面上に当該文字候補を表示する（ステップ
Ｄ）。Accordingly, the display control unit 10 sets, for example, a blue color based on the additional information (step C), and displays the character candidate on the screen of the display unit 9 in this color (step D).
かくしてこの実施例の光学的文字読取装置によれば、
知識処理において、知識辞書６から対応する単語候補が
得られない場合において、各行の第１文字候補をその妥
当性に応じたカラーで表示することにより、誤読の可能
性が高い文字候補を画面上で一目で識別することが可能
となり、この結果、誤読箇所の修正を効率良く行うこと
ができる。Thus, according to the optical character reader of this embodiment,
In the knowledge processing, when a corresponding word candidate cannot be obtained from the knowledge dictionary 6, the first character candidate in each line is displayed in a color corresponding to its validity, thereby displaying a character candidate having a high possibility of misreading on the screen. Can be identified at a glance, and as a result, erroneous reading can be corrected efficiently.
［発明の効果］ 以上説明したように本発明の光学的文字読取装置によ
れば、知識処理において、文字候補のマトリックスに対
応する単語候補が知識辞書から得られなかった場合に、
各行の第１文字候補を識別できるようにそれぞれ妥当性
に応じて表示することにより、誤読の可能性が高い文字
候補を一目で判断することができ、誤読箇所の修正を効
率良く行うことができる。[Effects of the Invention] As described above, according to the optical character reading device of the present invention, when a word candidate corresponding to a matrix of character candidates is not obtained from the knowledge dictionary in the knowledge processing,
By displaying the first character candidates in each line according to the validity so that they can be identified, character candidates having a high possibility of misreading can be determined at a glance, and the misread portion can be corrected efficiently. .
第１図は本発明に係る一実施例の光学的文字読取装置の
構成を説明するためのブロック図、第２図は第１図の光
学的文字読取装置における全体の処理を説明するための
図、第３図は第２図における素読み文字の妥当性チェッ
クからカラー表示までの流れを示すフローチャートであ
る。 １……イメージ読込部、２……認識辞書、３……文字認
識部、４……類似度保持部、５……類似度分布格納部、
６……知識辞書、７……知識処理部、８……文字候補妥
当性判定部、９……表示部、10……表示制御部。FIG. 1 is a block diagram for explaining the configuration of an optical character reading apparatus according to one embodiment of the present invention, and FIG. 2 is a view for explaining the overall processing in the optical character reading apparatus of FIG. FIG. 3 is a flowchart showing the flow from the validity check of the unread characters to the color display in FIG. 1 ... image reading unit, 2 ... recognition dictionary, 3 ... character recognition unit, 4 ... similarity holding unit, 5 ... similarity distribution storage unit,
6 knowledge dictionary, 7 knowledge processing unit, 8 character candidate validity determination unit, 9 display unit, 10 display control unit.
Claims (1)
データとして読込むイメージ読込手段と、 各カテゴリの標準パターンが予め格納された認識辞書
と、 前記イメージ読込手段より読込まれた文字パターンと前
記認識辞書内の各標準パターンとを照合して類似度を求
め、これらの類似度に基づいて複数の文字候補を判定す
る文字認識手段と、 この文字認識手段により得られた各文字候補の類似度を
保持する類似度保持手段と、 前記認識辞書内の各カテゴリについての類似度分布が予
め格納された類似度分布格納手段と、 知識情報として単語が格納された知識辞書と、 前記文字認識手段により得た文字候補のマトリックスか
ら前記知識辞書を用いて知識処理を行う知識処理手段
と、 知識処理において前記文字候補のマトリックスに対応す
る単語候補が前記知識辞書から得られなかった場合、行
毎に、最も類似度の高い第１文字候補の妥当性を、前記
類似度保持手段に保持された類似度と前記類似度分布格
納手段に格納された該当するカテゴリの類似度分布とか
ら判定する文字候補妥当性判定手段と、 その判定結果に基づき、前記各行の第１文字候補を識別
できるようにそれぞれ妥当性に応じて表示するよう制御
を行う表示制御手段とを具備することを特徴とする光学
的文字読取装置。An image reading means for reading a character pattern written on a form as image data; a recognition dictionary in which standard patterns of respective categories are stored in advance; a character pattern read from said image reading means; Character recognition means for comparing each standard pattern in the recognition dictionary to obtain a similarity and determining a plurality of character candidates based on the similarity; and similarity of each character candidate obtained by the character recognition means. A similarity distribution storage unit that stores in advance a similarity distribution for each category in the recognition dictionary; a knowledge dictionary that stores words as knowledge information; and the character recognition unit. A knowledge processing means for performing knowledge processing from the obtained character candidate matrix using the knowledge dictionary; If no word candidate is obtained from the knowledge dictionary, the validity of the first character candidate having the highest similarity is determined for each line by the similarity held in the similarity holding means and the similarity distribution storage means. And character candidate validity determination means for determining from the similarity distribution of the corresponding category stored in the storage unit. Based on the determination result, the first character candidate in each line is displayed according to the validity so as to be identified. An optical character reading device comprising: display control means for performing control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2083226A JP2878772B2 (en) | 1990-03-30 | 1990-03-30 | Optical character reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2083226A JP2878772B2 (en) | 1990-03-30 | 1990-03-30 | Optical character reader |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03282793A JPH03282793A (en) | 1991-12-12 |
| JP2878772B2 true JP2878772B2 (en) | 1999-04-05 |
Family
ID=13796407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2083226A Expired - Lifetime JP2878772B2 (en) | 1990-03-30 | 1990-03-30 | Optical character reader |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2878772B2 (en) |
-
1990
- 1990-03-30 JP JP2083226A patent/JP2878772B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03282793A (en) | 1991-12-12 |
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