JPH1195179A - Image processing method using spatial optical modulation element - Google Patents
Image processing method using spatial optical modulation elementInfo
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- JPH1195179A JPH1195179A JP25169797A JP25169797A JPH1195179A JP H1195179 A JPH1195179 A JP H1195179A JP 25169797 A JP25169797 A JP 25169797A JP 25169797 A JP25169797 A JP 25169797A JP H1195179 A JPH1195179 A JP H1195179A
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- light
- image
- modulation element
- optical modulation
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、空間光変調素子を用い
た画像処理方法に関し、とくに電気光学効果と光伝導効
果を有する空間光変調素子を用いた画像の輪郭抽出をす
るための画像処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing method using a spatial light modulator, and more particularly to an image processing for extracting an outline of an image using a spatial light modulator having an electro-optic effect and a photoconductive effect. About the method.
【０００２】[0002]
【従来の技術】画像処理には、各種の方法が行われてい
るが、画像をデジタルデータに変換した後に、画像処理
を行うデジタル画像処理方法がひろく用いられている。
デジタル画像処理では、膨大な２次元のデータを１画素
毎にコンピュータなどの処理装置を用いて処理するため
に、各種の画像処理アルゴリズムや専用プロセッサ等を
用いても処理時間が長くなるという問題がある。一方、
光学的画像処理装置を用いた画像処理では、光速での処
理が可能であるという特徴を有しているが、充分な特性
を有する画像処理装置が提案されていない。2. Description of the Related Art Various methods have been used for image processing, and a digital image processing method for performing image processing after converting an image into digital data has been widely used.
In digital image processing, a huge amount of two-dimensional data is processed pixel by pixel using a processing device such as a computer. Therefore, there is a problem that the processing time is long even if various image processing algorithms or dedicated processors are used. is there. on the other hand,
Image processing using an optical image processing apparatus has a feature that processing can be performed at the speed of light, but an image processing apparatus having sufficient characteristics has not been proposed.
【０００３】例えば、画像の輪郭抽出は、特定の物体を
取り出したり、画像認識等を進めるうえでの極めて重要
な処理操作であるが、光学的画像処理方法による輪郭抽
出装置が、特開平５−２６５０３０号公報として提案さ
れているが、液晶ライトバルブを用いたものであり、動
作速度が遅いという問題点があった。[0003] For example, contour extraction of an image is a very important processing operation for extracting a specific object or promoting image recognition. Although it is proposed in Japanese Patent Publication No. 265030, the liquid crystal light valve is used, and there is a problem that the operation speed is slow.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、空間光変調
素子を用いた高速に画像の輪郭を抽出する装置を提供す
ることを課題とするものである。SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for extracting a contour of an image at high speed using a spatial light modulator.
【０００５】[0005]
【課題を解決するための手段】空間光変調素子を用いた
画像処理方法において、電気光学結晶層の両面に絶縁層
を介して透明電極を形成した空間変調素子の該透明電極
間に電圧を印加した状態で、画像の露光をし、次に印加
電圧を除いた状態で画像の露光を再度行った後に、印加
電圧を除いた状態もしくは電圧印加した状態で読み取り
光を照射することによって、画像の輪郭抽出を行う空間
光変調素子を用いた画像処理方法である。In an image processing method using a spatial light modulator, a voltage is applied between the transparent electrodes of a spatial modulator in which transparent electrodes are formed on both sides of an electro-optic crystal layer via insulating layers. In this state, the image is exposed, then the image is exposed again with the applied voltage removed, and then the reading light is irradiated with the applied voltage removed or with the voltage applied, whereby the image is exposed. This is an image processing method using a spatial light modulator for performing contour extraction.
【０００６】[0006]
【発明の実施の形態】本発明は、光空間変調素子とし
て、電気光学結晶を用いたポッケルス読み出し光変調素
子を用いた画像の輪郭抽出方法を提案するものである。
ポッケルス読み出し光変調素子は、力学的な変化を伴わ
ずに電界による直接的な屈折率変化を起こすポッケルス
効果を示す電気光学結晶を用いたものである。使用可能
な電気光学結晶としては、Ｂｉ12ＳｉＯ20、Ｂｉ12Ｇｅ
Ｏ20、ＬｉＮｂＯ3、ＬｉＮＴａＯ3、ＺｎＳ、ＺｎＴ
ｅ、水晶などの単結晶を挙げることができる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention proposes a method for extracting a contour of an image using a Pockels readout light modulation element using an electro-optic crystal as a light spatial modulation element.
The Pockels readout light modulation element uses an electro-optic crystal exhibiting the Pockels effect that causes a direct change in the refractive index due to an electric field without a mechanical change. Usable electro-optic crystals include Bi 12 SiO 20 and Bi 12 Ge
O 20 , LiNbO 3 , LiNTaO 3 , ZnS, ZnT
e, a single crystal such as quartz.
【０００７】例えば、Ｂｉ12ＳｉＯ20からなる単結晶を
使用したポッケルス読み出し光変調素子は、書き込み画
像情報の光強度分布を単結晶板内の電荷分布に変換して
蓄積し、次いでこの電荷分布がつくる電界によって生ず
る電気光学効果を利用し、読み出し光の強度分布に変換
することができる。For example, a Pockels readout light modulation element using a single crystal made of Bi 12 SiO 20 converts the light intensity distribution of the written image information into a charge distribution in a single crystal plate and accumulates it. By utilizing the electro-optic effect generated by the electric field to be generated, it is possible to convert the read light into an intensity distribution.
【０００８】電気光学結晶を用いた空間光変調素子の一
例を図２に示す。電気光学結晶層２１の両面にそれぞれ
ガラス等の絶縁層２２、２３が設けられている。絶縁層
上には、ＩＴＯ等の透明電極層２４、２５が設けられて
おり、ガラス等の基板２６、２７が設けられており、透
明電極層２４および２５には、外部回路への接続用の電
極リード線２８、２９が接続されている。この様な電気
光学結晶を用いた空間光変調素子は、特開平５−１３４
２１９号公報、特開平４−２５７８２２号公報等におい
て提案されている。FIG. 2 shows an example of a spatial light modulator using an electro-optic crystal. Insulating layers 22 and 23 made of glass or the like are provided on both surfaces of the electro-optic crystal layer 21, respectively. Transparent electrode layers 24 and 25 such as ITO are provided on the insulating layer, substrates 26 and 27 such as glass are provided, and the transparent electrode layers 24 and 25 are provided for connection to an external circuit. Electrode lead wires 28 and 29 are connected. A spatial light modulator using such an electro-optic crystal is disclosed in Japanese Patent Laid-Open No. 5-134.
No. 219, Japanese Patent Application Laid-Open No. 4-257822 and the like.
【０００９】本発明のポッケルス読み出し光変調素子を
用いた輪郭抽出方法においては、以下のような作用機構
によって輪郭部の抽出が実現できるものと推定されてい
る。ポッケルス読み出し光変調素子の透明電極間に数ｋ
Ｖの高電圧を印加し、高強度の書き込み光を照射すると
電気光学結晶層内では、光キャリアが生じ、入力画像に
対して反転した画像情報が記録される。この時、画像の
輪郭部分では、光の照射量の少ない領域に向かってキャ
リアの拡散がおきる。なお、書き込み光として使用する
光は、ポッケルス読み出し光変調素子の電気光学結晶層
が十分に高い光導電性を示す波長の光を用いることが必
要である。In the contour extraction method using the Pockels readout light modulation element of the present invention, it is presumed that the contour portion can be extracted by the following operation mechanism. Several k between transparent electrodes of Pockels readout light modulation element
When a high voltage of V is applied and writing light of high intensity is applied, photocarriers are generated in the electro-optic crystal layer, and image information inverted with respect to the input image is recorded. At this time, in the outline portion of the image, the diffusion of the carriers occurs toward a region where the light irradiation amount is small. Note that it is necessary to use light having a wavelength at which the electro-optic crystal layer of the Pockels readout light modulation element has sufficiently high photoconductivity as light to be used as writing light.
【００１０】次いで、ポッケルス読み出し光変調素子の
印加電圧を取り除くと、記録された画像情報は、反転し
て書き込み光と同一極性の画像となる。この後に、再び
書き込み光によって画像情報を記録すると、画像の入力
された領域に光キャリアが生じ、電界が打ち消される。
このために、電気光学結晶層内に記録された記録画像と
入力画像の差分演算が行われる。そして、先の書き込み
照射によって形成された輪郭部のキャリア拡散領域に
は、後の照射では光が照射されないために、拡散したキ
ャリアが残存する。そして、読み出し光を照射すると輪
郭部の残留キャリアにより生じた電界のために輪郭部の
みに光を透過して輪郭抽出が行われる。また、輪郭部の
みにキャリアが残留した状態で再びポッケルス読み出し
光変調素子に数ｋＶの電圧を印加すると再びネガポジ反
転が生じ、輪郭部に光が透過して輪郭部の抽出が行われ
る。Next, when the voltage applied to the Pockels readout light modulation element is removed, the recorded image information is inverted to become an image having the same polarity as the writing light. Thereafter, when image information is recorded again by the writing light, optical carriers are generated in the area where the image is input, and the electric field is canceled.
For this purpose, the difference between the recorded image recorded in the electro-optic crystal layer and the input image is calculated. Then, in the carrier diffusion region of the contour formed by the previous writing irradiation, diffused carriers remain because light is not irradiated in the later irradiation. When the readout light is irradiated, the light is transmitted only to the contour portion and the contour is extracted due to the electric field generated by the residual carriers in the contour portion. When a voltage of several kV is applied again to the Pockels readout light modulation element in a state where the carrier remains only in the contour portion, negative-positive inversion occurs again, and light is transmitted to the contour portion to extract the contour portion.
【００１１】本発明で使用する読み出し光は、ポッケル
ス読み出し光変調素子の電気光学結晶層が光導電特性を
示さない光もしくは、読み出し時間中に記録した画像情
報が劣化しない程度の光導電特性を示す光を用いること
が好ましい。また、読み出し光による画像の検出は、ポ
ッケルス読み出し光変調素子の入射側と出射側に互いに
偏光面が直交する偏光板を配置して行う。The readout light used in the present invention is light in which the electro-optic crystal layer of the Pockels readout light modulation element does not exhibit photoconductive properties, or exhibits photoconductive properties to the extent that image information recorded during readout time does not deteriorate. Preferably, light is used. Further, the detection of an image by the readout light is performed by arranging polarizing plates whose polarization planes are orthogonal to each other on the incident side and the output side of the Pockels readout light modulation element.
【００１２】図１は、本発明の画像の輪郭抽出方法に用
いる装置の一例を説明する図である。FIG. 1 is a diagram for explaining an example of an apparatus used in the method for extracting an outline of an image according to the present invention.
【００１３】キセノンランプ等の光源１の光は、書き込
み光１４として電磁シャッター２、単色フィルター３を
透過して強度の大きな単色光とされて、レンズ４を透過
して入力用画像が描かれた画像フィルム５に達し、画像
情報がレンズ６、ハーフミラー７および偏光板８を透過
して、ポッケルス読み出し光変調素子９に到達し、高電
圧電源１０から数ｋＶの電圧が印加された状態で光変調
素子に画像情報が記録される。The light from the light source 1 such as a xenon lamp passes through the electromagnetic shutter 2 and the monochromatic filter 3 as writing light 14 to become monochromatic light with high intensity, and passes through the lens 4 to draw an input image. The image information reaches the image film 5, passes through the lens 6, the half mirror 7, and the polarizing plate 8, reaches the Pockels readout light modulation element 9, and is irradiated with a voltage of several kV from the high voltage power supply 10. Image information is recorded on the modulation element.
【００１４】次いで、光源１５から読み出し光１６を、
電磁シャッター１７、単色フィルター１８、レンズ１９
を透過させて、ハーフミラー７によって方向を変えて、
偏光板８を透過してポッケルス読み出し光変調素子９を
照射して記録情報を読み出し、偏光板１１およびレンズ
１２によってＣＣＤ等の検出装置１３によって検出する
と、検出される画像は、画像フィルム５に記録された画
像の反転画像であった。Next, the reading light 16 from the light source 15 is
Electromagnetic shutter 17, monochromatic filter 18, lens 19
And the direction is changed by the half mirror 7,
When the recording information is read out by irradiating the Pockels readout light modulating element 9 through the polarizing plate 8 and detected by the detecting device 13 such as a CCD by the polarizing plate 11 and the lens 12, the detected image is recorded on the image film 5. It was a reversed image of the image that was performed.
【００１５】次いで、ポッケルス読み出し光変調素子に
印加する電圧を０Ｖとした状態で、同様に読み出し光１
６を照射すると、記録画像は反転し、入力画像と同一の
特性のネガポジ特性を有する画像が得られた。次いで、
電磁シャッター２を開いて書き込み光１４によってポッ
ケルス読み出し光変調素子を照射するとともに、読み出
し光１６を照射すると、入力画像の輪郭部のみが光が透
過する画像が得られた。更に、ポッケルス読み出し光変
調素子に数ｋＶの電圧を印加し、読み出し光を照射した
ところ、、入力画像の輪郭部のみが光が遮蔽された画像
情報を得ることができた。Next, with the voltage applied to the Pockels readout light modulating element set to 0 V, the readout light
When irradiated with No. 6, the recorded image was inverted, and an image having the same negative-positive characteristics as the input image was obtained. Then
When the electromagnetic shutter 2 was opened and the Pockels readout light modulation element was irradiated with the write light 14 and the readout light 16 was irradiated, an image was obtained in which only the outline of the input image transmitted light. Further, when a voltage of several kV was applied to the Pockels readout light modulation element and the readout light was irradiated, image information in which only the outline of the input image was shielded from light could be obtained.
【００１６】以上の説明では、画像の入力に画像フィル
ムを用いる例を示したが、画像の入力は、画像フィルム
によらずに、イメージスキャナー等の入力装置、あるい
はレーザ光の描画による入力手段等の任意の方法によっ
て入力することができる。In the above description, an example in which an image film is used for inputting an image has been described. However, the input of an image can be performed by an input device such as an image scanner or an input unit by drawing a laser beam without depending on the image film. Can be entered by any method.
【００１７】[0017]
【実施例】以下に、実施例を示し本発明を説明する。 実施例１ 図１に示した装置によって、ポッケルス読み出し光変調
素子（日本碍子製 ＩＴＩ−ＰＲＯＭ）に電圧５ｋＶを
印加した状態で、キセノンランプ（浜松ホトニクス製
Ｌ２２７４）と単色フィルター（東芝ガラス製 ガラス
フィルターＫＴ−６０）によって、中心波長６００ｎ
ｍ、半値幅１２ｎｍの全面均一な読み出し光を照射した
ところ、読み出し光の４％が透過されてＣＣＤ検出器で
検出された。The present invention will be described below with reference to examples. Example 1 A xenon lamp (manufactured by Hamamatsu Photonics, Ltd.) was applied to the Pockels readout light modulation element (ITI-PROM manufactured by Nippon Insulators) with a voltage of 5 kV applied by the apparatus illustrated in FIG.
L2274) and a monochromatic filter (glass filter KT-60 made by Toshiba Glass Co., Ltd.)
Irradiation with uniform reading light having a m and a half value width of 12 nm was performed. As a result, 4% of the reading light was transmitted and detected by the CCD detector.
【００１８】ポッケルス読み出し光変調素子に電圧を印
加した状態で電磁シャッターを１０秒間開いて、キセノ
ンランプ（浜松ホトニクス製 Ｌ２２７４）と単色フィ
ルター（東芝ガラス製 ガラスフィルターＫＴ−５０）
によって、中心波長５００ｎｍ、半値幅１０ｎｍと単色
化した書き込み光を、画像フィルムを透過させた後、ポ
ッケルス読み出し光変調素子に照射したところ、入力画
像に対してネガ・ポジ反転した画像が得られた。次い
で、ポッケルス読み出し光変調素子への印加電圧を取り
除き、読み出し光をポッケルス読み出し光変調素子に照
射したところ、入力画像とネガ・ポジ特性が同一の画像
を検出器で検出することができた。With a voltage applied to the Pockels readout light modulation element, the electromagnetic shutter is opened for 10 seconds, and a xenon lamp (L2274 manufactured by Hamamatsu Photonics) and a monochromatic filter (glass filter KT-50 manufactured by Toshiba Glass) are used.
After the image film was irradiated with monochromatic writing light having a center wavelength of 500 nm and a half-value width of 10 nm, the Pockels readout light modulation element was irradiated with the writing light. . Next, the voltage applied to the Pockels readout light modulation element was removed, and the readout light was applied to the Pockels readout light modulation element. As a result, an image having the same negative / positive characteristics as the input image could be detected by the detector.
【００１９】さらに、この状態で電磁シャッターを５秒
間開いて、先に用いた中心波長５００ｎｍ、半値幅１０
ｎｍの書き込み光を、像情報を持つモノクロ画像フィル
ム５を透過させた後、ポッケルス読み出し光変調素子に
５秒間照射した。その後、読み出し光を照射したとこ
ろ、入力画像の輪郭部のみ、光が透過する画像情報を得
た。さらに、ポッケルス読み出し光変調素子に電圧５ｋ
Ｖを印加し、この状態で読み出し光を照射したところ、
入力画像の輪郭部のみ、光が遮蔽された像情報を得るこ
とができた。Further, in this state, the electromagnetic shutter is opened for 5 seconds, and the center wavelength of 500 nm and the half-value width of 10 are used.
After writing light of nm was transmitted through the monochrome image film 5 having image information, the Pockels readout light modulation element was irradiated for 5 seconds. After that, when reading light was irradiated, image information in which light was transmitted only in the contour portion of the input image was obtained. Further, a voltage of 5 k is applied to the Pockels readout light modulation element.
When V was applied and reading light was irradiated in this state,
Only in the outline of the input image, image information in which light was blocked could be obtained.
【００２０】[0020]
【発明の効果】電界光学結晶を用いた空間光変調素子を
用いたので、複雑な画像であっても書き込み光、読み込
み光および印加電圧の制御のみで輪郭部の抽出を容易に
行うことができる。According to the present invention, since the spatial light modulator using the electro-optic crystal is used, the contour can be easily extracted only by controlling the writing light, the reading light, and the applied voltage even for a complicated image. .
【図１】本発明の空間光変調素子を用いた画像処理方法
に用いる装置を説明する図である。FIG. 1 is a diagram illustrating an apparatus used for an image processing method using a spatial light modulator according to the present invention.
【図２】空間変調素子を説明する図である。FIG. 2 is a diagram illustrating a spatial modulation element.
１…光源、２…電磁シャッター、３…単色フィルター、
４…レンズ、５…画像フィルム、６…レンズ、７…ハー
フミラー、８…偏光板、９…ポッケルス読み出し光変調
素子、１０…高電圧電源、１１…偏光板、１２…レン
ズ、１３…検出装置、１４…書き込み光、１５…光源、
１６…読み出し光、１７…電磁シャッター、１８…単色
フィルター、１９…レンズ、２１…電気光学結晶層、２
２、２３…絶縁層、２４、２５…透明電極層、２６、２
７…基板、２８、２９…電極リード線1: light source, 2: electromagnetic shutter, 3: monochromatic filter,
4 lens, 5 image film, 6 lens, 7 half mirror, 8 polarizing plate, 9 Pockels readout light modulator, 10 high voltage power supply, 11 polarizing plate, 12 lens, 13 detecting device , 14 ... writing light, 15 ... light source,
Reference numeral 16: reading light, 17: electromagnetic shutter, 18: monochromatic filter, 19: lens, 21: electro-optic crystal layer, 2
2, 23 ... insulating layer, 24, 25 ... transparent electrode layer, 26, 2
7 ... substrate, 28, 29 ... electrode lead wire
Claims (1)
おいて、電気光学結晶層の両面に絶縁層を介して透明電
極を形成した空間変調素子の該透明電極間に電圧を印加
した状態で、画像の露光をした後に、印加電圧を除いた
状態で画像の露光を再度行い、次いで、印加電圧を除い
た状態もしくは電圧印加した状態で読み取り光を照射す
ることによって、画像の輪郭抽出を行うことを特徴とす
る空間光変調素子を用いた画像処理方法。1. An image processing method using a spatial light modulator, wherein a voltage is applied between the transparent electrodes of a spatial modulator in which a transparent electrode is formed on both surfaces of an electro-optic crystal layer via an insulating layer. After exposing the image, re-expose the image with the applied voltage removed, and then irradiate the reading light with the applied voltage removed or with the voltage applied to extract the contour of the image. An image processing method using a spatial light modulator, characterized by the following.
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|---|---|---|---|
| JP25169797A JPH1195179A (en) | 1997-09-17 | 1997-09-17 | Image processing method using spatial optical modulation element |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25169797A JPH1195179A (en) | 1997-09-17 | 1997-09-17 | Image processing method using spatial optical modulation element |
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| Publication Number | Publication Date |
|---|---|
| JPH1195179A true JPH1195179A (en) | 1999-04-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120010554A (en) * | 2010-07-26 | 2012-02-03 | 한국전자통신연구원 | Holographic display with high resolution |
-
1997
- 1997-09-17 JP JP25169797A patent/JPH1195179A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120010554A (en) * | 2010-07-26 | 2012-02-03 | 한국전자통신연구원 | Holographic display with high resolution |
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