JPH08241374A - Device and method for reading character - Google Patents

Device and method for reading character

Info

Publication number
JPH08241374A
JPH08241374A JP7042977A JP4297795A JPH08241374A JP H08241374 A JPH08241374 A JP H08241374A JP 7042977 A JP7042977 A JP 7042977A JP 4297795 A JP4297795 A JP 4297795A JP H08241374 A JPH08241374 A JP H08241374A
Authority
JP
Japan
Prior art keywords
character
illumination
incident angle
image data
glass substrate
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
Application number
JP7042977A
Other languages
Japanese (ja)
Inventor
Shigeru Yamada
茂 山田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP7042977A priority Critical patent/JPH08241374A/en
Publication of JPH08241374A publication Critical patent/JPH08241374A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To increase the luminance of a character part by arranging the optical axis of a lighting device so that it crosses a direction of orientation, i.e., length direction at right angles. CONSTITUTION: As shown in (b), the character part 4 is formed of a repetitive pattern of unevenness (white and black correspond to a recessed and a projection part respectively) having an orientation direction fixed. An arrow 17 in the figure indicates the direction of lighting by the lighting device 7 in a figure (a). The lighting device 7 is so arranged that the character part 4 is lighted up as shown by the arrow 17, namely, in the orientation direction of the unevenness, i.e., in a direction crossing the length direction at right angles, and then irregular reflection is caused at edges of the unevenness of the character part 4, so that an image can be picked up even when the character part is transparent. Thus, the optical axis 8 of the lighting optical system is arranged at right angles to the length direction and then since the luminance of the character part 4 is made high, even characters of high transmissivity which are engraved on the glass substrate of a liquid crystal display body can clearly be recognized.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、液晶表示体等のガラス
基板上に刻印された文字を認識する文字読み取り装置お
よび方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a character reading device and method for recognizing characters imprinted on a glass substrate such as a liquid crystal display.

【0002】[0002]

【従来の技術】従来、液晶表示体等のガラス基板上に刻
印された文字を認識する場合、液晶表示体のガラス基板
上に刻印された文字は透明電極等に用いられているイン
ジウム錫酸化物ITO(Indium Tin Oxide)で形成されて
いるために、容易にはできなかった。そのため、液晶表
示体等のガラス基板上に刻印された文字を認識するに
は、撮像系の前に偏光板を設置したり、照明の光源に特
定の波長帯域を有するものを用いたり、照明する方向を
試行錯誤しながら決定したりして、液晶表示体等のガラ
ス基板上に刻印された文字を可能な限り明瞭にした状態
で画像データとして取り込み、文字の認識がなされてい
た。
2. Description of the Related Art Conventionally, when recognizing characters engraved on a glass substrate of a liquid crystal display or the like, the characters engraved on the glass substrate of the liquid crystal display are used as indium tin oxide. Since it was formed of ITO (Indium Tin Oxide), it could not be easily done. Therefore, in order to recognize characters engraved on a glass substrate such as a liquid crystal display, a polarizing plate is installed in front of the image pickup system, a light source having a specific wavelength band is used for illumination, or illumination is performed. Characters have been recognized by deciding the direction by trial and error and importing the characters engraved on a glass substrate such as a liquid crystal display as clear as possible as image data.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、上記従
来例では、液晶表示体等のガラス基板上に刻印された透
過性の高い文字を認識する場合に、撮像系の前に偏光板
を設置したり、照明の光源に特定の波長帯域を有するも
のを用いたり、照明する方向を試行錯誤しながら決定し
たりしていたために、撮像光学系あるいは照明系の最適
化に多くの時間を消費したり、装置が複雑になり、装置
コストの増加と文字の認識率の低下を招く等の欠点があ
った。
However, in the above conventional example, when recognizing a highly transparent character engraved on a glass substrate such as a liquid crystal display, a polarizing plate is installed in front of the image pickup system. , The illumination light source having a specific wavelength band is used, or the illumination direction is determined by trial and error, so that a large amount of time is consumed in optimizing the imaging optical system or the illumination system, There are drawbacks such that the device becomes complicated, the device cost increases, and the character recognition rate decreases.

【0004】本発明の目的は、液晶表示体等のガラス基
板上に刻印された透過性の高い文字を認識する場合、照
明装置の光軸を配向性を有する方向すなわち長手方向と
直交するように配置することにより、文字部分の輝度を
上げることである。
An object of the present invention is to make the optical axis of the illuminating device orthogonal to the direction having orientation, that is, the longitudinal direction, when recognizing highly transparent characters engraved on a glass substrate such as a liquid crystal display. By arranging it, the brightness of the character portion is increased.

【0005】また、本発明の他の目的は、液晶表示体等
のガラス基板上に刻印された透過性の高い文字を認識す
る場合、文字部分の輝度が最大となるようにガラス基板
と照明装置の光軸のなす角すなわち入射角を自動制御し
て、ガラス基板と文字部分のコントラスト比を最大にす
ることである。
Another object of the present invention is to provide a glass substrate and a lighting device so that the brightness of the character portion is maximized when recognizing a highly transparent character engraved on a glass substrate such as a liquid crystal display. The angle formed by the optical axis of, that is, the incident angle is automatically controlled to maximize the contrast ratio between the glass substrate and the character portion.

【0006】本発明の第3の目的は、液晶表示体のガラ
ス基板上に刻印された透過性の高い文字を認識する場
合、入力画像データを画像補正により文字の部分的な欠
落を補正し、文字の認識率を向上させることである。
A third object of the present invention is to, when recognizing a highly transparent character engraved on a glass substrate of a liquid crystal display, correct a partial omission of the character by image correction of input image data, It is to improve the recognition rate of characters.

【0007】[0007]

【課題を解決するための手段】請求項1記載の発明は、
ガラス基板上に透過性の高い複数の凹凸のブロックより
形成される文字を認識する装置において、該文字を凹凸
の配向方向すなわち長手方向と直交する方向より照明す
る照明装置と、該文字を画像データとして光電変換する
撮像装置と、該画像データを予め登録された文字と比較
して文字認識する文字認識手段とを有することを特徴と
する文字読み取り装置である。
According to the first aspect of the present invention,
In a device for recognizing a character formed by a plurality of highly transparent blocks of unevenness on a glass substrate, an illuminating device that illuminates the character from the orientation direction of the unevenness, that is, the direction orthogonal to the longitudinal direction, and the character image data. And a character recognition unit that recognizes a character by comparing the image data with a character registered in advance.

【0008】請求項2記載の発明は、前記照明装置の照
明角調整手段と、文字部の画像データのコントラスト最
大となる照明入射角を計測する計測手段と、コントラス
ト最大となる照明入射角に前記照明角調整手段を設定す
る手段とを有することを特徴とする請求項1記載の文字
読み取り装置である。
According to a second aspect of the present invention, the illumination angle adjusting means of the illuminating device, the measuring means for measuring the illumination incident angle at which the contrast of the image data of the character portion is maximized, and the illumination incident angle at which the contrast is maximized are set to the illumination incident angle. The character reading device according to claim 1, further comprising: a means for setting an illumination angle adjusting means.

【0009】請求項3の発明は、前記文字認識手段は、
画像補正手段を有し、文字の部分的な欠落を補正して文
字を認識することを特徴とする請求項1又は2記載の文
字読み取り装置である。
In the invention of claim 3, the character recognition means is
The character reading device according to claim 1 or 2, further comprising an image correction unit, which recognizes a character by correcting a partial omission of the character.

【0010】請求項4の発明は、ガラス基板上に透過性
の高い複数の凹凸のブロックより形成される文字を認識
する方法において、該文字を凹凸の配向方向すなわち長
手方向と直交する方向より照明し、該文字を画像データ
として光電変換し、該画像データを予め登録された文字
と比較して文字認識することを特徴とする文字読み取り
方法である。
According to a fourth aspect of the present invention, in a method for recognizing a character formed by a plurality of highly transparent blocks of unevenness on a glass substrate, the character is illuminated from an orientation direction of the unevenness, that is, a direction orthogonal to a longitudinal direction. Then, the character is photoelectrically converted as image data, and the image data is compared with a character registered in advance to perform character recognition, which is a character reading method.

【0011】請求項5の発明は、前記照明の照明入射角
を調整し、文字部の画像データのコントラスト最大とな
る照明入射角を計測し、コントラスト最大となるように
前記照明入射角を設定することを特徴とする請求項4記
載の文字読み取り方法である。
According to a fifth aspect of the present invention, the illumination incident angle of the illumination is adjusted, the illumination incident angle that maximizes the contrast of the image data of the character portion is measured, and the illumination incident angle is set so that the contrast becomes maximum. The character reading method according to claim 4, wherein.

【0012】請求項6の発明は、前記文字認識は、画像
補正を行い、文字の部分的な欠落を補正して文字を認識
することを特徴とする請求項4又は5記載の文字読み取
り方法である。
According to a sixth aspect of the present invention, in the character recognition, an image correction is performed to correct a partial omission of the character to recognize the character. is there.

【0013】[0013]

【作用】本発明によれば、照明装置の光軸を、文字の凹
凸の配向性を有する方向すなわち長手方向と直交するよ
うに配置することにより、文字部分の輝度を上げている
ので、液晶表示体のガラス基板上に刻印された透過性の
高い文字も明確に認識できる。
According to the present invention, the brightness of the character portion is increased by arranging the optical axis of the illuminating device so as to be orthogonal to the direction having the orientation of the irregularities of the character, that is, the longitudinal direction. Characters with high transparency imprinted on the glass substrate of the body can also be clearly recognized.

【0014】また、本発明によれば、文字部分の輝度が
最大となるようにガラス基板と照明装置の光軸のなす角
すなわち照明入射角を自動制御して、ガラス基板と文字
部分のコントラスト比を最大にすることで、なお一層液
晶表示体のガラス基板上に刻印された透過性の高い文字
も明確に認識できる。
According to the present invention, the contrast ratio between the glass substrate and the character portion is automatically controlled by automatically controlling the angle between the glass substrate and the optical axis of the illuminating device, that is, the illumination incident angle so that the brightness of the character portion is maximized. By maximizing the maximum, it is possible to clearly recognize even highly transparent characters engraved on the glass substrate of the liquid crystal display.

【0015】その上、本発明は、入力画像データを画像
修復により文字の部分的な欠落を補正しているので、透
過性の高い文字の認識率を向上させることできる。
Moreover, according to the present invention, since the input image data is corrected by image restoration to partially eliminate characters, it is possible to improve the recognition rate of highly transparent characters.

【0016】[0016]

【実施例】以下、図面を参照して本発明の実施例を詳細
に説明する。
Embodiments of the present invention will be described below in detail with reference to the drawings.

【0017】図1(a)は本発明の実施例の構成を示す
ブロック図である。図1(a)において、1は移動手段
であるところのステージ、2はステージ上に置かれたガ
ラス基板、3はステージの移動方向、4はガラス基板に
マークされた配向性のある文字部である。また、7は文
字部の凹凸の配向方向と直交する位置に設置された文字
部を照明する照明装置、6は照明装置の入射角を可変す
る回転機構、5は回転機構の回転方向、8は照明装置の
照明光学系の光軸、15は文字部に対する照明の入射角
Θ、9は回転機構の制御ユニットである。そして、10
は照明された文字部を撮像するテレビカメラ(例えばC
CDカメラ、以後iTVと呼ぶ)、11はテレビカメラ
の光学系の光軸である。14は画像処理や制御を行うコ
ンピュータ、12はコンピュータと制御ユニットを結ぶ
信号ケーブル、13はコンピュータ14とテレビカメラ
10を結ぶ信号ケーブルである。
FIG. 1A is a block diagram showing the configuration of an embodiment of the present invention. In FIG. 1 (a), 1 is a stage which is a moving means, 2 is a glass substrate placed on the stage, 3 is a moving direction of the stage, and 4 is an oriented character portion marked on the glass substrate. is there. Further, 7 is an illuminating device that illuminates the character part installed at a position orthogonal to the orientation direction of the unevenness of the character part, 6 is a rotating mechanism that changes the incident angle of the illuminating device, 5 is the rotating direction of the rotating mechanism, and 8 is The optical axis of the illumination optical system of the illumination device, 15 is the incident angle Θ of the illumination with respect to the character portion, and 9 is the control unit of the rotation mechanism. And 10
Is a television camera (for example, C
A CD camera, hereinafter referred to as iTV), 11 is an optical axis of an optical system of the television camera. Reference numeral 14 is a computer for performing image processing and control, 12 is a signal cable connecting the computer and the control unit, and 13 is a signal cable connecting the computer 14 and the television camera 10.

【0018】図1(b)は、図1(a)の文字部4を上
から見た図である。4は文字部、17は照明の方向を示
している。図1(b)に示すように文字部は、配向方向
の定まった凹凸(白、黒各々凹、凸部分に対応)の繰り
返しパターンによって形成されている。同図の矢印17
は図1(a)の照明装置5の照明の方向を示している。
この照明は、文字部4に対して矢印17の方向に、即ち
凹凸の配向方向すなわち長手方向と直交する方向より照
明できるように、照明装置5を配置することにより、文
字部4の凹凸部分のエッジが乱反射して、その結果とし
て文字部が透明であっても像として捕らえることが可能
となる。
FIG. 1B is a view of the character portion 4 of FIG. 1A as seen from above. Reference numeral 4 indicates a character portion, and 17 indicates an illumination direction. As shown in FIG. 1B, the character portion is formed by a repeating pattern of irregularities (corresponding to concave and convex portions of white and black, respectively) in which the alignment direction is fixed. Arrow 17 in the figure
Indicates the direction of illumination of the illumination device 5 in FIG.
By arranging the illuminating device 5 so that this illumination can illuminate the character portion 4 in the direction of the arrow 17, that is, the orientation direction of the unevenness, that is, the direction orthogonal to the longitudinal direction, the uneven portion of the character portion 4 can be illuminated. The edges are irregularly reflected, and as a result, even if the character portion is transparent, it can be captured as an image.

【0019】次に、実施例を、上記図1(a),(b)
と全体の動作を示すフローチャートである図2を用いて
説明する。
Next, an embodiment will be described with reference to FIGS. 1 (a) and 1 (b).
2 will be described with reference to FIG. 2, which is a flowchart showing the overall operation.

【0020】コンピュータ14より、シーケンス開始の
スタート信号により文字をマークされたガラス基板2が
ステージ1によって搬入されて、所定の場所に位置決め
される(図2のS2−1からS2−3)。そして、透過
性の高い文字部の文字が一番明瞭に見えるように、照明
入射角をセットして(S2−4)、文字の認識を開始す
る。この照明入射角のセットについては、図3のフロー
チャートを用いて以下に詳しく説明する。そして、文字
部を明瞭に認識するために、認識の前処理として、文字
部の修復を行う(S2−5)。この修復に関しても、後
に図4のフローチャートを用いて詳しく説明する。そし
て、この読み取られ、修復された文字部に関して、文字
認識を行う(S2ー6)。この文字認識は、上記の文字
部を修復した2値画像を、予め登録された文字と比較し
て、最も一致度の高い文字を該当文字として認識、これ
で全ての処理を終了する。この様にして、液晶表示体の
ガラス基板上に刻印された文字を正確に認識することが
できる。
From the computer 14, the glass substrate 2 marked with characters by the start signal for starting the sequence is carried in by the stage 1 and positioned at a predetermined place (S2-1 to S2-3 in FIG. 2). Then, the illumination incident angle is set so that the character in the character portion having high transparency can be seen most clearly (S2-4), and the recognition of the character is started. This set of illumination incident angles will be described in detail below using the flowchart of FIG. Then, in order to clearly recognize the character portion, the character portion is repaired as a preprocessing of the recognition (S2-5). This repair will also be described later in detail using the flowchart of FIG. Then, character recognition is performed on the read and restored character portion (S2-6). In this character recognition, the binary image in which the above-mentioned character part is restored is compared with a character registered in advance, and the character having the highest degree of coincidence is recognized as the corresponding character, and all the processing is ended. In this way, the characters imprinted on the glass substrate of the liquid crystal display can be accurately recognized.

【0021】さて、照明入射角のセットの処理(S2ー
4)について、図3のフローチャートを用いて、詳細に
説明する。図1(a)のコンピュータ14より、照明入
射角Θの下限値Θmin をΘ1 、上限値Θmax をΘ2 、刻
み角ΔΘをθに、繰り返しカウンタNを0に初期化する
(S3−2)。そして、コンピュータ14により、照明
の入射角の回転機構の制御ユニット9内のレジスタに信
号ケーブル13を介して、値を送ることにより照明入射
角を制御する。
The process of setting the illumination incident angle (S2-4) will be described in detail with reference to the flowchart of FIG. From the computer 14 of FIG. 1A, the lower limit value Θ min of the illumination incident angle Θ is Θ 1 , the upper limit value Θ max is Θ 2 , the step angle ΔΘ is initialized to θ, and the repetition counter N is initialized to 0 (S3-). 2). Then, the computer 14 controls the incident angle of illumination by sending a value to the register in the control unit 9 of the rotation mechanism of the incident angle of illumination via the signal cable 13.

【0022】まず、照明入射角を下限値Θ1 にセットし
て、ここから開始する(S3ー3)。
First, the illumination incident angle is set to the lower limit value Θ 1 and the operation is started from here (S3-3).

【0023】この照明入射角の場合の文字部の画像を、
コンピュータ14内に、iTV11より文字部4の周辺
部分を含む画像データとして、画像メモリにA/D変換
された後ストアする(S3−4)。そして、照明入射角
をθ増加する(S3−5)。上記画像メモリにストアさ
れた256階調のデジタル画像データは、濃度ヒストグ
ラム処理されて、文字部に対応した入射角(N×ΔΘ+
Θ1 )におけるピークの輝度値が求められ、コンピュー
タ14のメモリに登録される(S3−6)。そして、繰
り返しカウンタ値Nをインクリメントする(S3−
7)。
The image of the character portion at this incident angle of illumination is
In the computer 14, the image data including the peripheral portion of the character portion 4 is stored in the image memory after being A / D converted by the iTV 11 (S3-4). Then, the illumination incident angle is increased by θ (S3-5). The 256-gradation digital image data stored in the image memory is subjected to density histogram processing to obtain an incident angle (N × ΔΘ +) corresponding to the character portion.
The luminance value of the peak in Θ 1 ) is obtained and registered in the memory of the computer 14 (S3-6). Then, the repeat counter value N is incremented (S3-
7).

【0024】このような処理を、繰り返しカウンタ値N
と繰り返し毎の照明入射角の刻み角を乗じた値と照明入
射角の下限値Θ1 を加算した値が、照明入射角の上限値
Θより小さい場合、すなわち照明入射角が上限値Θ
を越えない場合は、繰返し行う(S3−8)。
Such processing is repeated for the counter value N
And the value obtained by adding the value obtained by multiplying the step angle of the illumination incident angle for each repetition and the lower limit value Θ 1 of the illumination incident angle are smaller than the upper limit value Θ 2 of the illumination incident angle, that is, the illumination incident angle is the upper limit value Θ 2.
If it does not exceed, repeat (S3-8).

【0025】照明入射角Θが上限値Θ2 を越えたら、繰
り返しの処理を終了して、コンピュータ14のメモリに
登録された各入射角毎の文字部の輝度のピーク値から、
最大輝度値に対応する照明入射角を求める(S3ー
9)。そして、コンピュータ14より信号ケーブル13
を介して、回転機構の制御ユニット9にコマンドが発せ
られ、文字部の輝度が最も高い照明入射角がセットする
(S3−10)。これで、読み取られる画像データのコ
ントラストが最大のなるように、図2の照明入射角のセ
ットの処理(S2−4)を終了する。
When the illumination incident angle Θ exceeds the upper limit value Θ 2 , the repetitive processing is terminated, and from the peak value of the luminance of the character portion registered for each incident angle in the memory of the computer 14,
An illumination incident angle corresponding to the maximum brightness value is obtained (S3-9). Then, the signal cable 13 from the computer 14
A command is issued to the control unit 9 of the rotating mechanism via the, and the illumination incident angle at which the brightness of the character portion is highest is set (S3-10). This completes the process of setting the illumination incident angle (S2-4) in FIG. 2 so that the contrast of the read image data is maximized.

【0026】次に、文字部の修復の処理(S2−5)に
ついて、図4のフローチャートを用いて詳細に説明す
る。
Next, the process of restoring the character portion (S2-5) will be described in detail with reference to the flowchart of FIG.

【0027】まず、画像取り込み領域の照明むらを補正
するためにシェーディング補正(S4−2)を行う。こ
のシェーディング補正は、文字幅に比較して十分大きい
n×nのローパス空間フィルタ処理を行い、元画像と該
処理画像の差分画像を求めることで行う。
First, shading correction (S4-2) is performed to correct the illumination unevenness in the image capturing area. This shading correction is performed by performing n × n low-pass spatial filter processing that is sufficiently larger than the character width, and obtaining a difference image between the original image and the processed image.

【0028】また、シェーディング補正の処理として、
上記の空間フィルタ処理の代わりに、半径ro(ただ
し、2×ro 文字幅)、画素濃度値do(任意の階
調)の円柱状のstructuring elemen
tによるopening処理を行い、元画像から該画像
の差をとり差分画像を求めてもよい。
As the shading correction processing,
Instead of the above spatial filter processing, a columnar constructing element having a radius ro (2 × ro character width) and a pixel density value do (arbitrary gradation) is used.
It is also possible to perform an opening process based on t and obtain the difference image by taking the difference between the images from the original image.

【0029】続いて、局所的な輝度むらの補正を行う
(S4−3)。この局所的な輝度むらの補正の処理は、
例えば、上記差分画像を、半径rc(ただし、2×rc
<文字幅)、画素値濃度dc(任意の階調)の円柱状の
structuring elementによるclo
sing処理することで行う。
Then, local uneven brightness is corrected (S4-3). The process of correcting the local uneven brightness is
For example, if the difference image is the radius rc (2 × rc
<Character width), pixel-shaped density dc (arbitrary gradation), a column-shaped structuring element
This is performed by performing a sing process.

【0030】続いて、文字部の輪郭を補正する処理を行
う(S4−5)。この文字部の輪郭を補正する処理は、
上記closing画像の2値画像を求め、該2値画像
の文字部をm×m(ただし、m<文字幅)の論理フィル
タにより膨張・収縮、あるいは収縮・膨張処理を行い、
文字輪郭部の局所的な凹凸を除去することで行う。これ
で、文字部の修復処理を終了する。
Then, a process for correcting the contour of the character portion is performed (S4-5). The process of correcting the outline of this character part is
The binary image of the closing image is obtained, and the character portion of the binary image is expanded / contracted or contracted / expanded by a logical filter of m × m (where m <character width).
This is done by removing the local unevenness of the character outline portion. This completes the character portion restoration process.

【0031】[0031]

【発明の効果】以上説明したように、本発明によれば、
照明装置の光軸を、文字の凹凸の配向性を有する方向す
なわち長手方向と直交するように配置することにより、
文字部分の輝度を上げているので、液晶表示体のガラス
基板上に刻印された透過性の高い文字も明確に認識でき
る。
As described above, according to the present invention,
By arranging the optical axis of the lighting device so as to be orthogonal to the direction having the orientation of the irregularities of the character, that is, the longitudinal direction,
Since the brightness of the character portion is increased, it is possible to clearly recognize the highly transparent character engraved on the glass substrate of the liquid crystal display.

【0032】また、本発明によれば、文字部分の輝度が
最大となるようにガラス基板と照明装置の光軸のなす角
すなわち照明入射角を自動制御して、ガラス基板と文字
部分のコントラスト比を最大にすることで、なお一層液
晶表示体等のガラス基板上に刻印された透過性の高い文
字も明確に認識できる。
Further, according to the present invention, the angle between the glass substrate and the optical axis of the illuminating device, that is, the illumination incident angle is automatically controlled so that the brightness of the character portion is maximized, and the contrast ratio between the glass substrate and the character portion is increased. By maximizing the maximum value, it is possible to clearly recognize even highly transparent characters imprinted on a glass substrate such as a liquid crystal display.

【0033】その上、本発明は、入力画像データを画像
修復により文字の部分的な欠落を補正しているので、透
過性の高い文字の認識率を向上させることできる。
Moreover, according to the present invention, since the input image data is corrected for the partial omission of characters by image restoration, the recognition rate of highly transparent characters can be improved.

【図面の簡単な説明】[Brief description of drawings]

【図1】(a)は本発明の文字読み取り装置構成のを示
すブロック図、(b)は文字部と照明方向の関係を示し
た図である。
FIG. 1A is a block diagram showing a configuration of a character reading device of the present invention, and FIG. 1B is a diagram showing a relationship between a character portion and an illumination direction.

【図2】文字読み取り装置の全体の処理を示したフロー
チャートである。
FIG. 2 is a flowchart showing the overall processing of the character reading device.

【図3】照明角のセットの処理を示したフローチャート
である。
FIG. 3 is a flowchart showing a process of setting an illumination angle.

【図4】文字部の修復の処理を示したフローチャートで
ある。
FIG. 4 is a flowchart showing a process of repairing a character portion.

【符号の説明】[Explanation of symbols]

1 ステージ 2 ガラス基板 3 ステージ移動方向 4 文字部 5 回転方向 6 回転機構 7 照明装置 8 照明光学系の光軸 9 制御ユニット 10 テレビカメラ 11 テレビカメラの光軸 12 コンピュータ・制御ユニット間の信号ケーブル 13 コンピュータ・テレビカメラ間の信号ケーブル 14 コンピュータ 15 照明の入射角 17 照明の方向(長手方向と直交する方向) 1 stage 2 glass substrate 3 stage movement direction 4 character part 5 rotation direction 6 rotation mechanism 7 lighting device 8 optical axis of illumination optical system 9 control unit 10 TV camera 11 TV camera optical axis 12 signal cable between computer and control unit 13 Signal cable between computer and TV camera 14 Computer 15 Incident angle of illumination 17 Direction of illumination (direction orthogonal to longitudinal direction)

Claims (6)

【特許請求の範囲】[Claims] 【請求項1】 ガラス基板上に透過性の高い複数の凹凸
のブロックより形成される文字を認識する装置におい
て、 該文字を凹凸の配向方向すなわち長手方向と直交する方
向より照明する照明装置と、 該文字を画像データとして光電変換する撮像装置と、 該画像データを予め登録された文字と比較して文字認識
する文字認識手段とを有することを特徴とする文字読み
取り装置。
1. A device for recognizing a character formed of a plurality of highly permeable and concave blocks having high transparency on a glass substrate, and an illuminating device for illuminating the character in the orientation direction of the asperities, that is, in the direction orthogonal to the longitudinal direction. A character reading device comprising: an image pickup device for photoelectrically converting the character as image data; and a character recognition means for recognizing the character by comparing the image data with a character registered in advance.
【請求項2】 前記照明装置の照明角調整手段と、 文字部の画像データのコントラスト最大となる照明入射
角を計測する計測手段と、 コントラスト最大となる照明入射角に前記照明角調整手
段を設定する手段とを有することを特徴とする請求項1
記載の文字読み取り装置。
2. An illumination angle adjusting means of the illumination device, a measuring means for measuring an illumination incident angle having a maximum contrast of image data of a character portion, and the illumination angle adjusting means being set to an illumination incident angle having a maximum contrast. And means for doing so.
Character reading device described.
【請求項3】 前記文字認識手段は、画像補正手段を有
し、文字の部分的な欠落を補正して文字を認識すること
を特徴とする請求項1又は2記載の文字読み取り装置。
3. The character reading device according to claim 1, wherein the character recognition means has an image correction means, and recognizes a character by correcting partial omission of the character.
【請求項4】 ガラス基板上に透過性の高い複数の凹凸
のブロックより形成される文字を認識する方法におい
て、 該文字を凹凸の配向方向すなわち長手方向と直交する方
向より照明し、 該文字を画像データとして光電変換し、 該画像データを予め登録された文字と比較して文字認識
することを特徴とする文字読み取り方法。
4. A method for recognizing a character formed from a plurality of highly transparent blocks having unevenness on a glass substrate, illuminating the character from the orientation direction of the unevenness, that is, the direction orthogonal to the longitudinal direction, and illuminating the character. A character reading method characterized by performing photoelectric conversion as image data and recognizing the character by comparing the image data with a character registered in advance.
【請求項5】 前記照明の照明入射角を調整し、 文字部の画像データのコントラスト最大となる照明入射
角を計測し、 コントラスト最大となるように前記照明入射角を設定す
ることを特徴とする請求項4記載の文字読み取り方法。
5. The illumination incident angle of the illumination is adjusted, the illumination incident angle at which the contrast of the image data of the character portion is maximized is measured, and the illumination incident angle is set so that the contrast is maximized. The character reading method according to claim 4.
【請求項6】 前記文字認識は、画像補正を行い、文字
の部分的な欠落を補正して文字を認識することを特徴と
する請求項4又は5記載の文字読み取り方法。
6. The character reading method according to claim 4, wherein in the character recognition, image correction is performed to correct a partial omission of the character to recognize the character.
JP7042977A 1995-03-02 1995-03-02 Device and method for reading character Pending JPH08241374A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7042977A JPH08241374A (en) 1995-03-02 1995-03-02 Device and method for reading character

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7042977A JPH08241374A (en) 1995-03-02 1995-03-02 Device and method for reading character

Publications (1)

Publication Number Publication Date
JPH08241374A true JPH08241374A (en) 1996-09-17

Family

ID=12651110

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7042977A Pending JPH08241374A (en) 1995-03-02 1995-03-02 Device and method for reading character

Country Status (1)

Country Link
JP (1) JPH08241374A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998000693A1 (en) * 1996-06-28 1998-01-08 G. Rodenstock Instrumente Gmbh Process and device for measuring the optical properties of spectacle lenses by means of an optical detector of engravings in the spectacle lenses
WO2014129018A1 (en) * 2013-02-25 2014-08-28 三菱重工業株式会社 Character recognition device, character recognition method, and recording medium
JP2016174725A (en) * 2015-03-20 2016-10-06 名古屋電機工業株式会社 Appearance inspection device, appearance inspection method, and board unit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998000693A1 (en) * 1996-06-28 1998-01-08 G. Rodenstock Instrumente Gmbh Process and device for measuring the optical properties of spectacle lenses by means of an optical detector of engravings in the spectacle lenses
WO2014129018A1 (en) * 2013-02-25 2014-08-28 三菱重工業株式会社 Character recognition device, character recognition method, and recording medium
JP2014164528A (en) * 2013-02-25 2014-09-08 Mitsubishi Heavy Ind Ltd Character recognition device, character recognition method, and program
JP2016174725A (en) * 2015-03-20 2016-10-06 名古屋電機工業株式会社 Appearance inspection device, appearance inspection method, and board unit

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