JP5484419B2

JP5484419B2 - Ophthalmic apparatus and conversion method

Info

Publication number: JP5484419B2
Application number: JP2011204655A
Authority: JP
Inventors: 元也高井
Original assignee: Canon Inc
Current assignee: Canon Inc
Priority date: 2011-09-20
Filing date: 2011-09-20
Publication date: 2014-05-07
Anticipated expiration: 2021-06-27
Also published as: JP2012020157A

Description

本発明は、眼科医院や集団検診等で使用される眼科撮影装置に関するものである。 The present invention relates to an ophthalmologic photographing apparatus used in an ophthalmic clinic or a mass examination.

従来から、眼科撮影装置にＣＣＤカメラを接続し、被検眼を撮影する例えば眼底カメラ等が知られている。眼底カメラでは、カラー撮影又は蛍光撮影を行う際には、ＣＣＤカメラにより受像された眼底画像の電気信号を例えば１０ビットにＡ／Ｄ変換し、ルックアップテーブル（ＬＵＴ）の設定による画像処理によって８ビットに階調変換して、それらを表示又は記録する方式が一般に知られている。 2. Description of the Related Art Conventionally, for example, a fundus camera that captures an eye to be examined by connecting a CCD camera to an ophthalmologic photographing apparatus is known. In the fundus camera, when performing color photography or fluorescence photography, the electrical signal of the fundus image received by the CCD camera is A / D converted to, for example, 10 bits, and 8 by image processing by setting a lookup table (LUT). A method of converting the gradation into bits and displaying or recording them is generally known.

図６は眼底像全体の輝度のヒストグラム図であり、（ａ）はカラー撮影の場合、（ｂ）は蛍光撮影の場合である。横軸は輝度、縦軸は頻度を示しており、Ａ、Ｂ、Ｃはそれぞれアパーチャ部、黄班部、乳頭部に相当する。 6A and 6B are histograms of the luminance of the entire fundus image. FIG. 6A shows the case of color photography, and FIG. 6B shows the case of fluorescence photography. The horizontal axis represents luminance, and the vertical axis represents frequency, and A, B, and C correspond to the aperture portion, the macula portion, and the nipple, respectively.

通常の階調変換では、図６のＬの範囲を８ビットのデジタルデータに変換して、画像データを取得している。 In normal gradation conversion, the range of L in FIG. 6 is converted into 8-bit digital data to acquire image data.

しかしながら上述の従来例においては、カラー撮影された画像と蛍光撮影された画像とでは画像の特性が異なっており、カラー画像の場合には、濃淡情報に加えて色情報が必要となるが、蛍光画像の場合は濃淡情報に重点がおかれている。 However, in the above-described conventional example, the characteristics of the image are different between the color photographed image and the fluorescence photographed image. In the case of a color image, color information is required in addition to the grayscale information. In the case of images, emphasis is placed on shading information.

従って、これらの画像をデジタル変換（８ビット変換）する際に、例えばカラー画像には図６（ａ）のＨ及びＩ部の濃度分解能を重視したルックアップテーブルを適用するが、蛍光画像では特に静脈注射後の初期から中期の段階においては、暗部の頻度が高い。従って、カラー画像用のルックアップテーブルを適用すると、暗部の画像情報が失われてしまい、診断に支障をきたしてしまう。このため、図６（ｂ）のＨ’及びＩ部の濃度分解能に適したルックアップテーブルを設定した方が、より診断し易い画像が得られる。更には、これらの画像処理選択を撮影者に委ねると撮影者に手間を掛けさせてしまい煩わしい。 Therefore, when these images are digitally converted (8-bit conversion), for example, a color image is applied with a look-up table that emphasizes the density resolution of the H and I portions in FIG. In the early to middle stages after intravenous injection, the frequency of dark areas is high. Therefore, when the color image look-up table is applied, the image information in the dark portion is lost, which hinders diagnosis. For this reason, an image that is easier to diagnose can be obtained by setting a look-up table suitable for the density resolution of the H ′ and I portions in FIG. Furthermore, entrusting the photographer with these image processing selections is troublesome because it takes time and effort to the photographer.

本発明の目的は上述の従来例の改良であり、より具体的な目的の１つは、撮影モードに適した階調変換の設定を行うことによって、より好ましい画像を生成し、診断効率を向上させることができる眼科撮影装置を提供することにある。 An object of the present invention is to improve the above-described conventional example, and one of the more specific objects is to generate a more preferable image and improve diagnostic efficiency by setting gradation conversion suitable for the shooting mode. Another object of the present invention is to provide an ophthalmologic photographing apparatus that can be made to operate.

上記目的を達成するための本発明に係る眼科装置は、
被検眼を照明する照明光学系と、前記被検眼からの戻り光に基づいて前記被検眼の静止画を撮像する撮像光学系と、前記照明光学系に挿脱可能に備えられたエキサイタフィルタと、前記撮像光学系に挿脱可能に備えられたバリアフィルタと、蛍光撮影モードおよびカラー撮影モードのいずれかを選択する選択手段と、前記選択手段によって前記蛍光撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記照明光学系および前記撮像光学系にそれぞれ挿入する一方、前記選択手段によって前記カラー撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記照明光学系および前記撮像光学系からそれぞれ退避させるフィルタ制御部と、前記選択手段によって前記蛍光撮影モードが選択された場合に前記蛍光撮影モード用の第１の階調変換特性を示す第１のルックアップテーブルを用いて前記撮像光学系によって得られる画像信号を変換する一方、前記選択手段によってカラー撮影モードが選択された場合に前記第１の階調変換特性とは異なる特性である前記カラー撮影用の第２の階調変換特性を示す第２のルックアップテーブルを用いて前記撮像光学系によって得られる画像信号を変換する変換部と、を備える。
また、本発明に係る眼科装置は被検眼に対向する位置に設けられた対物レンズと、前記対物レンズの前記被検眼方向とは反対側に設けられた孔あきミラーと、前記対物レンズおよび前記孔あきミラーを介して被検眼を照明する光源と、前記被検眼からの戻り光を前記対物レンズおよび前記孔あきミラーを介して受光し、前記被検眼の静止画を撮像するカメラと、前記光源と前記対物レンズとを結ぶ第１の光路に挿脱可能に備えられたエキサイタフィルタと、前記対物レンズと前記カメラとを結ぶ第２の光路に挿脱可能に備えられたバリアフィルタと、蛍光撮影モードおよびカラー撮影モードのいずれかを選択する選択手段と、前記選択手段によって前記蛍光撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記第１の光路および前記第２の光路にそれぞれ挿入する一方、前記選択手段によって前記カラー撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記第１の光路および前記第２の光路からそれぞれ退避させるフィルタ制御部と、前記選択手段によって前記蛍光撮影モードが選択された場合に前記蛍光撮影モード用の第１の階調変換特性を示す第１のルックアップテーブルを用いて前記カメラによって得られる画像信号を変換する一方、前記選択手段によってカラー撮影モードが選択された場合に前記第１の階調変換特性とは異なる特性である前記カラー撮影用の第２の階調変換特性を示す第２のルックアップテーブルを用いて前記カメラによって得られる画像信号を変換する変換部と、を備える。
さらに、本発明に係る眼科装置は、被検眼に対向する位置に設けられた対物レンズと、前記対物レンズの前記被検眼方向とは反対側に設けられた孔あきミラーと、前記対物レンズおよび前記孔あきミラーを介して被検眼を照明する光源と、前記被検眼からの戻り光を前記対物レンズおよび前記孔あきミラーを介して受光し、前記被検眼の静止画を撮像するカメラと、前記光源と前記対物レンズとを結ぶ第１の光路に挿脱可能に備えられたエキサイタフィルタと、前記対物レンズと前記カメラとを結ぶ第２の光路に挿脱可能に備えられたバリアフィルタと、前記カメラによって得られる前記静止画を示す画像信号を記憶するメモリと、蛍光撮影およびカラー撮影のいずれかを選択する選択手段と、前記選択手段によって前記蛍光撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記第１の光路および前記第２の光路にそれぞれ挿入する一方、前記選択手段によって前記カラー撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記第１の光路および前記第２の光路からそれぞれ退避させるフィルタ制御部と、前記選択手段によって前記蛍光撮影モードが選択された場合に前記蛍光撮影モード用の第１の階調変換特性を示す第１のルックアップテーブルを用いて前記メモリに記憶された画像信号を変換する一方、前記選択手段によってカラー撮影モードが選択された場合に前記第１の階調変換特性とは異なる特性である前記カラー撮影用の第２の階調変換特性を示す第２のルックアップテーブルを用いて前記メモリに記憶された画像信号を変換する変換部と、を備える。
また、本発明に係る眼科装置は、被検眼に対向する位置に設けられた対物レンズと、前記対物レンズの前記被検眼方向とは反対側に設けられた孔あきミラーと、前記対物レンズおよび前記孔あきミラーを介して被検眼を照明する光源と、前記被検眼からの戻り光を前記対物レンズおよび前記孔あきミラーを介して受光し、前記被検眼の静止画を撮像するカメラと、前記光源と前記対物レンズとを結ぶ第１の光路に挿脱可能に備えられたエキサイタフィルタと、前記対物レンズと前記カメラとを結ぶ第２の光路に挿脱可能に備えられたバリアフィルタと、蛍光撮影モードおよびカラー撮影モードのいずれかを選択する選択手段と、前記選択手段によって前記蛍光撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記第１の光路および前記第２の光路にそれぞれ挿入する一方、前記選択手段によって前記カラー撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記第１の光路および前記第２の光路からそれぞれ退避させるフィルタ制御部と、前記選択手段によって前記蛍光撮影モードが選択された場合に前記蛍光撮影モード用の第１の階調変換特性を示す第１のルックアップテーブルを用いて前記カメラによって得られる画像信号を変換する一方、前記選択手段によってカラー撮影モードが選択された場合に前記第１の階調変換特性とは異なる特性である前記カラー撮影用の第２の階調変換特性を示す第２のルックアップテーブルを用いて前記カメラによって得られる画像信号を変換する変換部と、前記変換部によって変換された画像信号を表示するモニタと、を備える。
さらに、本発明に係る眼科装置は、被検眼に対向する位置に設けられた対物レンズと、前記対物レンズの前記被検眼方向とは反対側に設けられた孔あきミラーと、前記対物レンズおよび前記孔あきミラーを介して被検眼を照明する光源と、前記被検眼からの戻り光を前記対物レンズおよび前記孔あきミラーを介して受光し、前記被検眼の静止画を撮像するカメラと、前記光源と前記対物レンズとを結ぶ第１の光路に挿脱可能に備えられたエキサイタフィルタと、前記対物レンズと前記カメラとを結ぶ第２の光路に挿脱可能に備えられたバリアフィルタと、蛍光撮影モードおよびカラー撮影モードのいずれかを選択する選択手段と、前記選択手段によって前記蛍光撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記第１の光路および前記第２の光路にそれぞれ挿入する一方、前記選択手段によって前記カラー撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記第１の光路および前記第２の光路からそれぞれ退避させるフィルタ制御部と、前記選択手段によって前記蛍光撮影モードが選択された場合に前記蛍光撮影モード用の第１の階調変換特性を示す第１のルックアップテーブルを用いて前記カメラによって得られる画像信号を変換する一方、前記選択手段によってカラー撮影モードが選択された場合に前記第１の階調変換特性とは異なる特性である前記カラー撮影用の第２の階調変換特性を示す第２のルックアップテーブルを用いて前記カメラによって得られる画像信号を変換する変換部と、前記変換部によって変換された画像信号を記憶するメモリと、を備える。
また、本発明に係る眼科装置は、被検眼に対向する位置に設けられた対物レンズと、前記対物レンズの前記被検眼方向とは反対側に設けられた孔あきミラーと、前記対物レンズおよび前記孔あきミラーを介して被検眼を照明する光源と、前記被検眼からの戻り光を前記対物レンズおよび前記孔あきミラーを介して受光し、前記被検眼の静止画を撮像するカメラと、前記光源と前記対物レンズとを結ぶ第１の光路に挿脱可能に備えられたエキサイタフィルタと、前記対物レンズと前記カメラとを結ぶ第２の光路に挿脱可能に備えられたバリアフィルタと、蛍光撮影モードおよびカラー撮影モードのいずれかを選択する選択手段と、前記選択手段によって前記蛍光撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記第１の光路および前記第２の光路にそれぞれ挿入する一方、前記選択手段によって前記カラー撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記第１の光路および前記第２の光路からそれぞれ退避させるフィルタ制御部と、前記選択手段によって前記蛍光撮影モードが選択された場合に前記蛍光撮影モード用の第１の階調変換特性を示す第１のルックアップテーブルを用いて前記カメラによって得られる画像信号を変換する一方、前記選択手段によってカラー撮影モードが選択された場合に前記第１の階調変換特性とは異なる特性である前記カラー撮影用の第２の階調変換特性を示す第２のルックアップテーブルを用いて前記カメラによって得られる画像信号を変換する変換部と、前記変換部によって変換された画像信号を記憶するメモリと、前記変換部によって変換された画像信号を表示するモニタと、を備える。
さらに、本発明に係る変換方法は、被検眼を照明する照明光学系と、前記被検眼からの戻り光に基づいて前記被検眼の静止画を撮像する撮像光学系と、前記照明光学系に挿脱可能に備えられたエキサイタフィルタと、前記撮像光学系に挿脱可能に備えられたバリアフィルタと、蛍光撮影モードおよびカラー撮影モードのいずれかを選択する選択手段と、前記選択手段によって前記蛍光撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記照明光学系および前記撮像光学系にそれぞれ挿入する一方、前記選択手段によって前記カラー撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記照明光学系および前記撮像光学系からそれぞれ退避させるフィルタ制御部と、を備えた眼科装置において、前記選択手段によって前記蛍光撮影モードが選択された場合に前記蛍光撮影モード用の第１の階調変換特性を示す第１のルックアップテーブルを用いて前記撮像光学系によって得られる画像信号を変換する一方、前記選択手段によってカラー撮影モードが選択された場合に前記第１の階調変換特性とは異なる特性である前記カラー撮影用の第２の階調変換特性を示す第２のルックアップテーブルを用いて前記撮像光学系によって得られる画像信号を変換する変換工程を備える。
また、本発明に係る変換方法は、被検眼に対向する位置に設けられた対物レンズと、前記対物レンズの前記被検眼方向とは反対側に設けられた孔あきミラーと、前記対物レンズおよび前記孔あきミラーを介して被検眼を照明する光源と、前記被検眼からの戻り光を前記対物レンズおよび前記孔あきミラーを介して受光し、前記被検眼の静止画を撮像するカメラと、前記光源と前記対物レンズとを結ぶ第１の光路に挿脱可能に備えられたエキサイタフィルタと、前記対物レンズと前記カメラとを結ぶ第２の光路に挿脱可能に備えられたバリアフィルタと、蛍光撮影モードおよびカラー撮影モードのいずれかを選択する選択手段と、前記選択手段によって前記蛍光撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記第１の光路および前記第２の光路にそれぞれ挿入する一方、前記選択手段によって前記カラー撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記第１の光路および前記第２の光路からそれぞれ退避させるフィルタ制御部と、を備えた眼科装置において、前記選択手段によって前記蛍光撮影モードが選択された場合に前記蛍光撮影モード用の第１の階調変換特性を示す第１のルックアップテーブルを用いて前記カメラによって得られる画像信号を変換する一方、前記選択手段によってカラー撮影モードが選択された場合に前記第１の階調変換特性とは異なる特性である前記カラー撮影用の第２の階調変換特性を示す第２のルックアップテーブルを用いて前記カメラによって得られる画像信号を変換する変換工程と、を備える。
さらに、本発明に係る変換方法は、被検眼に対向する位置に設けられた対物レンズと、前記対物レンズの前記被検眼方向とは反対側に設けられた孔あきミラーと、前記対物レンズおよび前記孔あきミラーを介して被検眼を照明する光源と、前記被検眼からの戻り光を前記対物レンズおよび前記孔あきミラーを介して受光し、前記被検眼の静止画を撮像するカメラと、前記光源と前記対物レンズとを結ぶ第１の光路に挿脱可能に備えられたエキサイタフィルタと、前記対物レンズと前記カメラとを結ぶ第２の光路に挿脱可能に備えられたバリアフィルタと、前記カメラによって得られる前記静止画を示す画像信号を記憶するメモリと、蛍光撮影およびカラー撮影のいずれかを選択する選択手段と、前記選択手段によって前記蛍光撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記第１の光路および前記第２の光路にそれぞれ挿入する一方、前記選択手段によって前記カラー撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記第１の光路および前記第２の光路からそれぞれ退避させるフィルタ制御部と、を備えた眼科装置において前記選択手段によって前記蛍光撮影モードが選択された場合に前記蛍光撮影モード用の第１の階調変換特性を示す第１のルックアップテーブルを用いて前記メモリに記憶された画像信号を変換する一方、前記選択手段によってカラー撮影モードが選択された場合に前記第１の階調変換特性とは異なる特性である前記カラー撮影用の第２の階調変換特性を示す第２のルックアップテーブルを用いて前記メモリに記憶された画像信号を変換する変換工程を備える。
また、本発明に係る変換方法は、被検眼に対向する位置に設けられた対物レンズと、前記対物レンズの前記被検眼方向とは反対側に設けられた孔あきミラーと、前記対物レンズおよび前記孔あきミラーを介して被検眼を照明する光源と、前記被検眼からの戻り光を前記対物レンズおよび前記孔あきミラーを介して受光し、前記被検眼の静止画を撮像するカメラと、前記光源と前記対物レンズとを結ぶ第１の光路に挿脱可能に備えられたエキサイタフィルタと、前記対物レンズと前記カメラとを結ぶ第２の光路に挿脱可能に備えられたバリアフィルタと、蛍光撮影モードおよびカラー撮影モードのいずれかを選択する選択手段と、前記選択手段によって前記蛍光撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記第１の光路および前記第２の光路にそれぞれ挿入する一方、前記選択手段によって前記カラー撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記第１の光路および前記第２の光路からそれぞれ退避させるフィルタ制御部と、モニタと、を備えた眼科装置において前記選択手段によって前記蛍光撮影モードが選択された場合に前記蛍光撮影モード用の第１の階調変換特性を示す第１のルックアップテーブルを用いて前記カメラによって得られる画像信号を変換する一方、前記選択手段によってカラー撮影モードが選択された場合に前記第１の階調変換特性とは異なる特性である前記カラー撮影用の第２の階調変換特性を示す第２のルックアップテーブルを用いて前記カメラによって得られる画像信号を変換する変換工程と、前記変換工程において変換された画像信号を前記モニタに表示させる表示工程と、を備える。
さらに、本発明に係る変換方法は、被検眼に対向する位置に設けられた対物レンズと、前記対物レンズの前記被検眼方向とは反対側に設けられた孔あきミラーと、前記対物レンズおよび前記孔あきミラーを介して被検眼を照明する光源と、前記被検眼からの戻り光を前記対物レンズおよび前記孔あきミラーを介して受光し、前記被検眼の静止画を撮像するカメラと、前記光源と前記対物レンズとを結ぶ第１の光路に挿脱可能に備えられたエキサイタフィルタと、前記対物レンズと前記カメラとを結ぶ第２の光路に挿脱可能に備えられたバリアフィルタと、蛍光撮影モードおよびカラー撮影モードのいずれかを選択する選択手段と、前記選択手段によって前記蛍光撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記第１の光路および前記第２の光路にそれぞれ挿入する一方、前記選択手段によって前記カラー撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記第１の光路および前記第２の光路からそれぞれ退避させるフィルタ制御部と、を備えた眼科装置において、前記選択手段によって前記蛍光撮影モードが選択された場合に前記蛍光撮影モード用の第１の階調変換特性を示す第１のルックアップテーブルを用いて前記カメラによって得られる画像信号を変換する一方、前記選択手段によってカラー撮影モードが選択された場合に前記第１の階調変換特性とは異なる特性である前記カラー撮影用の第２の階調変換特性を示す第２のルックアップテーブルを用いて前記カメラによって得られる画像信号を変換する変換工程と、前記変換工程において変換された画像信号をメモリに記憶させる記憶工程と、を備える。
また、本発明に係る変換方法は、被検眼に対向する位置に設けられた対物レンズと、前記対物レンズの前記被検眼方向とは反対側に設けられた孔あきミラーと、前記対物レンズおよび前記孔あきミラーを介して被検眼を照明する光源と、前記被検眼からの戻り光を前記対物レンズおよび前記孔あきミラーを介して受光し、前記被検眼の静止画を撮像するカメラと、前記光源と前記対物レンズとを結ぶ第１の光路に挿脱可能に備えられたエキサイタフィルタと、前記対物レンズと前記カメラとを結ぶ第２の光路に挿脱可能に備えられたバリアフィルタと、蛍光撮影モードおよびカラー撮影モードのいずれかを選択する選択手段と、前記選択手段によって前記蛍光撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記第１の光路および前記第２の光路にそれぞれ挿入する一方、前記選択手段によって前記カラー撮影モードが選択された場合に前記エキサイタフィルタおよび前記バリアフィルタを前記第１の光路および前記第２の光路からそれぞれ退避させるフィルタ制御部と、モニタと、を備えた眼科装置において、前記選択手段によって前記蛍光撮影モードが選択された場合に前記蛍光撮影モード用の第１の階調変換特性を示す第１のルックアップテーブルを用いて前記カメラによって得られる画像信号を変換する一方、前記選択手段によってカラー撮影モードが選択された場合に前記第１の階調変換特性とは異なる特性である前記カラー撮影用の第２の階調変換特性を示す第２のルックアップテーブルを用いて前記カメラによって得られる画像信号を変換する変換工程と、前記変換工程において変換された画像信号をメモリに記憶させる記憶工程と、前記変換工程において変換された画像信号を前記モニタに表示させる表示工程と、を備える。 Eye KaSo location according to the present invention for achieving the above object,
An illumination optical system that illuminates the eye to be examined; an imaging optical system that captures a still image of the eye to be examined based on return light from the eye to be examined; and an exciter filter that is detachably attached to the illumination optical system; A barrier filter detachably provided in the imaging optical system; a selection unit that selects one of a fluorescence imaging mode and a color imaging mode; and the exciter filter when the fluorescence imaging mode is selected by the selection unit And the barrier filter are inserted into the illumination optical system and the imaging optical system, respectively, while the exciter filter and the barrier filter are inserted into the illumination optical system and the imaging optical when the color photographing mode is selected by the selection unit. The fluorescence imaging mode is controlled by the filter control unit that retracts from the system and the selection unit. When selected, the image signal obtained by the imaging optical system is converted using the first look-up table showing the first gradation conversion characteristic for the fluorescence imaging mode, while the color imaging mode is selected by the selection means. Obtained by the imaging optical system using a second look-up table showing the second gradation conversion characteristic for color photographing, which is a characteristic different from the first gradation conversion characteristic. A conversion unit that converts the image signal.
The ophthalmologic apparatus according to the present invention includes an objective lens provided at a position facing the eye to be examined, a perforated mirror provided on the opposite side of the objective lens from the eye direction, the objective lens, and the hole. A light source that illuminates the eye to be examined via a perforated mirror, a camera that receives return light from the eye to be examined via the objective lens and the perforated mirror, and that captures a still image of the eye to be examined; and the light source An exciter filter that is detachably provided in a first optical path connecting the objective lens, a barrier filter that is detachably provided in a second optical path connecting the objective lens and the camera, and a fluorescence imaging mode Selection means for selecting any one of the color photographing mode and the exciter filter and the barrier filter when the fluorescent photographing mode is selected by the selection means. The exciter filter and the barrier filter are inserted into the first optical path and the second optical path, respectively, and when the color photographing mode is selected by the selection means, the exciter filter and the barrier filter are inserted into the first optical path and the second optical path. And a filter control unit that evacuates each of the camera and a first lookup table that indicates a first gradation conversion characteristic for the fluorescence imaging mode when the fluorescence imaging mode is selected by the selection unit. While the obtained image signal is converted, when the color photographing mode is selected by the selection unit, the second gradation conversion characteristic for color photographing that is different from the first gradation conversion characteristic is shown. A conversion unit that converts an image signal obtained by the camera using a second lookup table.
Furthermore, an ophthalmologic apparatus according to the present invention includes an objective lens provided at a position facing the eye to be examined, a perforated mirror provided on the opposite side of the objective lens from the eye direction, the objective lens, and the objective lens. A light source that illuminates the eye to be examined through a perforated mirror, a camera that receives return light from the eye to be examined through the objective lens and the perforated mirror, and captures a still image of the eye to be examined, and the light source And an exciter filter provided in a first optical path connecting the objective lens and the objective lens, a barrier filter provided in a second optical path connecting the objective lens and the camera, and the camera A memory for storing an image signal indicating the still image obtained by selecting, a selecting means for selecting either fluorescent photographing or color photographing, and the fluorescent photographing mode is selected by the selecting means. The exciter filter and the barrier filter are inserted into the first optical path and the second optical path, respectively, while the exciter filter and the barrier filter are selected when the color photographing mode is selected by the selection unit. And a filter control unit for retracting the first and second optical paths respectively, and a first gradation conversion characteristic for the fluorescence imaging mode when the fluorescence imaging mode is selected by the selection unit. While the image signal stored in the memory is converted using the first look-up table, the color conversion mode is different from the first gradation conversion characteristic when the color photographing mode is selected by the selection unit. The memory is stored in the memory using a second look-up table indicating the second gradation conversion characteristic for color photographing. Comprising a converter for converting憶image signal.
The ophthalmologic apparatus according to the present invention includes an objective lens provided at a position facing the eye to be examined, a perforated mirror provided on the opposite side of the objective lens from the eye direction, the objective lens, and the objective lens. A light source that illuminates the eye to be examined through a perforated mirror, a camera that receives return light from the eye to be examined through the objective lens and the perforated mirror, and captures a still image of the eye to be examined, and the light source And an exciter filter provided in a first optical path connecting the objective lens and the objective lens, a barrier filter provided in a second optical path connecting the objective lens and the camera, and fluorescence imaging Selecting means for selecting one of a mode and a color photographing mode, and when the fluorescent photographing mode is selected by the selecting means, the exciter filter and the barrier filter The exciter filter and the barrier filter are inserted into the first optical path and the second optical path, respectively, and when the color photographing mode is selected by the selection means, the exciter filter and the barrier filter are inserted into the first optical path and the second optical path. And a filter control unit that evacuates each of the camera and a first lookup table that indicates a first gradation conversion characteristic for the fluorescence imaging mode when the fluorescence imaging mode is selected by the selection unit. While the obtained image signal is converted, when the color photographing mode is selected by the selection unit, the second gradation conversion characteristic for color photographing that is different from the first gradation conversion characteristic is shown. A conversion unit that converts an image signal obtained by the camera using a second lookup table; and , A monitor for displaying the converted image signal Te comprises a.
Furthermore, an ophthalmologic apparatus according to the present invention includes an objective lens provided at a position facing the eye to be examined, a perforated mirror provided on the opposite side of the objective lens from the eye direction, the objective lens, and the objective lens. A light source that illuminates the eye to be examined through a perforated mirror, a camera that receives return light from the eye to be examined through the objective lens and the perforated mirror, and captures a still image of the eye to be examined, and the light source And an exciter filter provided in a first optical path connecting the objective lens and the objective lens, a barrier filter provided in a second optical path connecting the objective lens and the camera, and fluorescence imaging Selecting means for selecting one of the mode and the color photographing mode, and when the fluorescent photographing mode is selected by the selecting means, the exciter filter and the barrier filter Are inserted into the first optical path and the second optical path, respectively, and when the color photographing mode is selected by the selection means, the exciter filter and the barrier filter are inserted into the first optical path and the second optical path. The camera using a filter control unit for retracting from the optical path and a first look-up table showing a first gradation conversion characteristic for the fluorescence imaging mode when the fluorescence imaging mode is selected by the selection unit The second gradation conversion characteristic for color photographing, which is a characteristic different from the first gradation conversion characteristic when the color photographing mode is selected by the selecting means, is converted. A conversion unit that converts an image signal obtained by the camera using a second look-up table shown in FIG. Storing the converted image signals comprises a memory.
The ophthalmologic apparatus according to the present invention includes an objective lens provided at a position facing the eye to be examined, a perforated mirror provided on the opposite side of the objective lens from the eye direction, the objective lens, and the objective lens. A light source that illuminates the eye to be examined through a perforated mirror, a camera that receives return light from the eye to be examined through the objective lens and the perforated mirror, and captures a still image of the eye to be examined, and the light source And an exciter filter provided in a first optical path connecting the objective lens and the objective lens, a barrier filter provided in a second optical path connecting the objective lens and the camera, and fluorescence imaging Selecting means for selecting one of a mode and a color photographing mode, and when the fluorescent photographing mode is selected by the selecting means, the exciter filter and the barrier filter The exciter filter and the barrier filter are inserted into the first optical path and the second optical path, respectively, and when the color photographing mode is selected by the selection means, the exciter filter and the barrier filter are inserted into the first optical path and the second optical path. And a filter control unit that evacuates each of the camera and a first lookup table that indicates a first gradation conversion characteristic for the fluorescence imaging mode when the fluorescence imaging mode is selected by the selection unit. While the obtained image signal is converted, when the color photographing mode is selected by the selection unit, the second gradation conversion characteristic for color photographing that is different from the first gradation conversion characteristic is shown. A conversion unit that converts an image signal obtained by the camera using a second lookup table; and Comprising a memory for storing the converted image signal, a monitor for displaying an image signal converted by the converting unit, the Te.
Further, the conversion method according to the present invention includes an illumination optical system that illuminates the eye to be examined, an imaging optical system that captures a still image of the eye to be examined based on return light from the eye to be examined, and an illumination optical system. An exciter filter provided so as to be removable, a barrier filter provided so as to be removable from the imaging optical system, a selection means for selecting one of a fluorescence photography mode and a color photography mode, and the fluorescence photography by the selection means When the mode is selected, the exciter filter and the barrier filter are inserted into the illumination optical system and the imaging optical system, respectively, and when the color photographing mode is selected by the selection unit, the exciter filter and the barrier are inserted. A filter control unit for retracting the filter from the illumination optical system and the imaging optical system, respectively. An image obtained by the imaging optical system using a first look-up table showing a first gradation conversion characteristic for the fluorescence imaging mode when the fluorescence imaging mode is selected by the selection means in the department device A second tone conversion characteristic for color photographing, which is a characteristic different from the first gradation conversion characteristic when a color photographing mode is selected by the selection means while the signal is converted; A conversion step of converting an image signal obtained by the imaging optical system using a lookup table;
Further, the conversion method according to the present invention includes an objective lens provided at a position facing the eye to be examined, a perforated mirror provided on a side opposite to the eye direction of the objective lens, the objective lens, and the A light source that illuminates the eye to be examined through a perforated mirror, a camera that receives return light from the eye to be examined through the objective lens and the perforated mirror, and captures a still image of the eye to be examined, and the light source And an exciter filter provided in a first optical path connecting the objective lens and the objective lens, a barrier filter provided in a second optical path connecting the objective lens and the camera, and fluorescence imaging Selecting means for selecting one of a mode and a color photographing mode, and when the fluorescent photographing mode is selected by the selecting means, the exciter filter and the barrier filter The exciter filter and the barrier filter are inserted into the first optical path and the second optical path, respectively, and when the color photographing mode is selected by the selection means, the exciter filter and the barrier filter are inserted into the first optical path and the second optical path. A first look-up characteristic indicating a first gradation conversion characteristic for the fluorescence imaging mode when the fluorescence imaging mode is selected by the selection unit. While the image signal obtained by the camera is converted using a table, the second color imaging second characteristic is different from the first gradation conversion characteristic when the color photographing mode is selected by the selection unit. An image signal obtained by the camera is converted using a second look-up table showing the tone conversion characteristics of Comprising a conversion step, the.
Further, the conversion method according to the present invention includes an objective lens provided at a position facing the eye to be examined, a perforated mirror provided on the opposite side of the objective lens from the eye direction, the objective lens, and the A light source that illuminates the eye to be examined through a perforated mirror, a camera that receives return light from the eye to be examined through the objective lens and the perforated mirror, and captures a still image of the eye to be examined, and the light source And an exciter filter provided in a first optical path connecting the objective lens and the objective lens, a barrier filter provided in a second optical path connecting the objective lens and the camera, and the camera A memory for storing an image signal indicating the still image obtained by selecting, a selecting means for selecting either fluorescent photographing or color photographing, and the fluorescent photographing mode is selected by the selecting means. The exciter filter and the barrier filter are inserted into the first optical path and the second optical path, respectively, while the exciter filter and the barrier filter are selected when the color photographing mode is selected by the selection unit. And a filter control unit for retracting the first optical path and the second optical path, respectively, when the fluorescence imaging mode is selected by the selection means in the ophthalmic apparatus, the first for the fluorescence imaging mode An image signal stored in the memory is converted using a first look-up table showing a gradation conversion characteristic, and when the color photographing mode is selected by the selection unit, the first gradation conversion characteristic Are different characteristics of the second look-up table showing the second gradation conversion characteristic for color photography. Comprising a conversion step of converting the image signal stored in the memory using the Le.
Further, the conversion method according to the present invention includes an objective lens provided at a position facing the eye to be examined, a perforated mirror provided on a side opposite to the eye direction of the objective lens, the objective lens, and the A light source that illuminates the eye to be examined through a perforated mirror, a camera that receives return light from the eye to be examined through the objective lens and the perforated mirror, and captures a still image of the eye to be examined, and the light source And an exciter filter provided in a first optical path connecting the objective lens and the objective lens, a barrier filter provided in a second optical path connecting the objective lens and the camera, and fluorescence imaging Selecting means for selecting one of a mode and a color photographing mode, and when the fluorescent photographing mode is selected by the selecting means, the exciter filter and the barrier filter The exciter filter and the barrier filter are inserted into the first optical path and the second optical path, respectively, and when the color photographing mode is selected by the selection means, the exciter filter and the barrier filter are inserted into the first optical path and the second optical path. A first gradation conversion characteristic for the fluorescence imaging mode when the fluorescence imaging mode is selected by the selection means in an ophthalmologic apparatus including a filter control unit and a monitor, respectively, While the image signal obtained by the camera is converted using a look-up table, the color photographing mode has characteristics different from the first gradation conversion characteristic when the color photographing mode is selected by the selection unit. An image signal obtained by the camera using a second look-up table showing a second gradation conversion characteristic Comprising a conversion step of converting, a display step of displaying the image signal converted in the converting step to the monitor, the.
Further, the conversion method according to the present invention includes an objective lens provided at a position facing the eye to be examined, a perforated mirror provided on the opposite side of the objective lens from the eye direction, the objective lens, and the A light source that illuminates the eye to be examined through a perforated mirror, a camera that receives return light from the eye to be examined through the objective lens and the perforated mirror, and captures a still image of the eye to be examined, and the light source And an exciter filter provided in a first optical path connecting the objective lens and the objective lens, a barrier filter provided in a second optical path connecting the objective lens and the camera, and fluorescence imaging Selecting means for selecting one of the mode and the color photographing mode, and when the fluorescent photographing mode is selected by the selecting means, the exciter filter and the barrier filter Are inserted into the first optical path and the second optical path, respectively, and when the color photographing mode is selected by the selection means, the exciter filter and the barrier filter are inserted into the first optical path and the second optical path. A first look showing a first gradation conversion characteristic for the fluorescence imaging mode when the fluorescence imaging mode is selected by the selection unit An image signal obtained by the camera is converted using an up table, while the color photographing mode is different from the first gradation conversion characteristic when the color photographing mode is selected by the selection means. An image signal obtained by the camera is converted using a second look-up table showing a gradation conversion characteristic of 2. Comprising a that conversion step, and a storage step of storing the converted image signal to the memory in said conversion step.
Further, the conversion method according to the present invention includes an objective lens provided at a position facing the eye to be examined, a perforated mirror provided on a side opposite to the eye direction of the objective lens, the objective lens, and the A light source that illuminates the eye to be examined through a perforated mirror, a camera that receives return light from the eye to be examined through the objective lens and the perforated mirror, and captures a still image of the eye to be examined, and the light source And an exciter filter provided in a first optical path connecting the objective lens and the objective lens, a barrier filter provided in a second optical path connecting the objective lens and the camera, and fluorescence imaging Selecting means for selecting one of a mode and a color photographing mode, and when the fluorescent photographing mode is selected by the selecting means, the exciter filter and the barrier filter The exciter filter and the barrier filter are inserted into the first optical path and the second optical path, respectively, and when the color photographing mode is selected by the selection means, the exciter filter and the barrier filter are inserted into the first optical path and the second optical path. In the ophthalmologic apparatus including the filter control unit and the monitor that respectively retract from the first, the first gradation conversion characteristic for the fluorescence imaging mode is displayed when the fluorescence imaging mode is selected by the selection unit. The image signal obtained by the camera is converted using the look-up table, and the color photographing mode has characteristics different from the first gradation conversion characteristic when the color photographing mode is selected by the selection unit. An image signal obtained by the camera using a second look-up table showing the second tone conversion characteristics of Comprising a conversion step of converting, a storage step of storing the image signal converted in said converting step into the memory, and a display step of displaying the converted image signal to the monitor in the conversion step a.

以上説明したように本発明に係る眼科撮影装置は、撮影モードに適した設定で画像変換するので、何れの撮影モードにおいても好ましい画像が得られ、より高度な診断が可能となる。 As described above, the ophthalmologic photographing apparatus according to the present invention converts an image with a setting suitable for the photographing mode, so that a preferable image can be obtained in any photographing mode and a more advanced diagnosis is possible.

眼科撮影装置の構成図である。It is a block diagram of an ophthalmologic photographing apparatus. 画像データの出力手順を示すフローチャート図である。It is a flowchart figure which shows the output procedure of image data. 被検眼眼底像の説明図である。It is explanatory drawing of a to-be-tested eye fundus image. カラー撮影画像用に設定されたルックアップテーブルの特性図である。FIG. 10 is a characteristic diagram of a lookup table set for a color photographed image. 蛍光撮影画像用に設定されたルックアップテーブルの特性図である。FIG. 6 is a characteristic diagram of a lookup table set for a fluorescent photographed image. 眼底像全体の輝度のヒストグラムの特性図である。It is a characteristic view of a histogram of luminance of the entire fundus image.

本発明を図１〜図５に図示の実施の形態に基づいて詳細に説明する。 The present invention will be described in detail based on the embodiment shown in FIGS.

図１は眼底カメラの構成図である。被検眼Ｅの前方には対物レンズ１を配置し、その後方の光路上には孔あきミラー２、フォーカスのために移動可能な撮影レンズ３、蛍光撮影用に矢印方向に光路から挿脱可能なバリアフィルタ４、可動ミラー５、テレビカメラ等の撮像手段６を配置する。 FIG. 1 is a configuration diagram of a fundus camera. The objective lens 1 is disposed in front of the eye E, a perforated mirror 2 is disposed on the optical path behind the eye E, the photographing lens 3 is movable for focusing, and is removable from the optical path in the direction of the arrow for fluorescent photographing. An imaging means 6 such as a barrier filter 4, a movable mirror 5, and a television camera is disposed.

可動ミラー５の反射方向にはハーフミラー７、眼底Ｅｒと共役にした固視灯８を配置し、ハーフミラー７の反射方向には、リレーレンズ９、赤外波長領域に感度を有するテレビカメラ１０を配置する。 A half mirror 7 and a fixation lamp 8 conjugated with the fundus Er are arranged in the reflection direction of the movable mirror 5, and in the reflection direction of the half mirror 7, a relay lens 9 and a TV camera 10 having sensitivity in the infrared wavelength region are arranged. Place.

また、孔あきミラー２への照明光の入射方向には、ハロゲンランプ等の可視光を発する観察光源１１側から、コンデンサレンズ１２、可視光カットフィルタ１３、可視光の閃光を発する撮影光源１４、蛍光撮影用として矢印方向に光路から挿脱可能なエキサイタフィルタ１５、リング状開口を有する絞り１６、レンズ１７を配列する。 Further, in the incident direction of the illumination light to the perforated mirror 2, from the observation light source 11 side that emits visible light such as a halogen lamp, a condenser lens 12, a visible light cut filter 13, an imaging light source 14 that emits visible light flash, An exciter filter 15 that can be inserted and removed from the optical path in the direction of the arrow, a diaphragm 16 having a ring-shaped opening, and a lens 17 are arranged for fluorescent imaging.

このように、対物レンズ１、撮影レンズ３により、眼底観察撮影光学系を構成し、撮像手段６と共に被検眼Ｅの眼底Ｅｒを撮像する眼底撮像光学系を構成する。更に可動ミラー５、ハーフミラー７、リレーレンズ９、テレビカメラ１０により撮影者に眼底像を提示する観察光学系を構成し、観察光源１１から孔あきミラー２の光路によって照明光学系を構成する。 Thus, the fundus observation imaging optical system is configured by the objective lens 1 and the imaging lens 3, and the fundus imaging optical system that images the fundus Er of the eye E together with the imaging unit 6 is configured. Further, an observation optical system that presents a fundus image to the photographer is configured by the movable mirror 5, the half mirror 7, the relay lens 9, and the television camera 10, and an illumination optical system is configured by the optical path of the perforated mirror 2 from the observation light source 11.

撮像手段６の出力はＡ／Ｄ変換部２０を介してフレームメモリ２１に接続する。フレームメモリ２１の出力はルックアップテーブル２２及びルックアップテーブル設定部２３に接続し、ルックアップテーブル２２の出力は、表示用メモリ２４及び記録媒体２５に接続する。 The output of the imaging means 6 is connected to the frame memory 21 via the A / D converter 20. The output of the frame memory 21 is connected to the lookup table 22 and the lookup table setting unit 23, and the output of the lookup table 22 is connected to the display memory 24 and the recording medium 25.

また、ルックアップテーブル設定部２３に接続した画像制御部２６は、制御回路２７、情報入力手段２８、表示用メモリ２４、記録媒体２５に接続する。制御回路２７は固視灯８、カラー撮影又は蛍光撮影を行うための選択スイッチ２９に接続する。テレビカメラ１０の出力はテレビモニタ３０に接続し、表示用メモリ２４の出力はＤ／Ａ変換部３１を介してテレビモニタ３２に接続する。 The image control unit 26 connected to the lookup table setting unit 23 is connected to the control circuit 27, the information input unit 28, the display memory 24, and the recording medium 25. The control circuit 27 is connected to the fixation lamp 8 and a selection switch 29 for performing color photographing or fluorescent photographing. The output of the television camera 10 is connected to the television monitor 30, and the output of the display memory 24 is connected to the television monitor 32 via the D / A converter 31.

図２は画像データの出力手順を示すフローチャート図である。 FIG. 2 is a flowchart showing an image data output procedure.

撮影者は撮影前に、被検者のＩＤ番号、氏名、生年月目、性別等の患者情報及び撮影画像を出力する際のファイルフォーマットを情報入力手段２８から画像制御部２６に入力する。次に、撮影者は対物レンズ１の正面に被検眼Ｅを位置させ、眼底撮影のためのアライメントを行う。 The photographer inputs patient information such as a subject's ID number, name, birth date, and sex, and a file format for outputting a photographed image from the information input means 28 to the image controller 26 before photographing. Next, the photographer positions the eye E in front of the objective lens 1 and performs alignment for fundus photography.

観察光源１１を点灯すると、その光はコンデンサレンズ１２により集光され、可視光カットフィルタ１３により赤外光のみになった観察光は、撮影光源１４、絞り１６、レンズ１７を通り、孔あきミラー２により左方に反射され、対物レンズ１を通り被検眼Ｅの瞳Ｅｐを介して眼底Ｅｒを照明する。そして、この観察光で照明された眼底像は、再び対物レンズ１、孔あきミラー２の孔部を通過し、撮影レンズ３を通り可動ミラー５により上方に反射され、更にハーフミラー７により左方に反射され、リレーレンズ９を通りテレビカメラ１０に達する。赤外光に感度を有するテレビカメラ１０は、受光した眼底像をテレビ信号に変換してテレビモニタ３０に出力する。撮影者はテレビモニタ３０に提示された眼底像を見ながら、被検眼Ｅと眼底カメラとの精密な位置合わせ、ピント合わせ及び撮影範囲の確認を行う。 When the observation light source 11 is turned on, the light is condensed by the condenser lens 12, and the observation light that has become only infrared light by the visible light cut filter 13 passes through the photographing light source 14, the diaphragm 16, and the lens 17, and is a perforated mirror. 2 is reflected leftward and passes through the objective lens 1 to illuminate the fundus Er through the pupil Ep of the eye E to be examined. Then, the fundus image illuminated with the observation light passes through the holes of the objective lens 1 and the perforated mirror 2 again, is reflected upward by the movable mirror 5 through the photographing lens 3, and further leftward by the half mirror 7. And reaches the TV camera 10 through the relay lens 9. The television camera 10 having sensitivity to infrared light converts the received fundus image into a television signal and outputs the television signal to the television monitor 30. While viewing the fundus image presented on the television monitor 30, the photographer performs precise positioning, focusing, and confirmation of the photographing range between the eye E and the fundus camera.

撮影者は撮影範囲、位置、ピント合わせが良好であることを確認した後に、図示しない撮影スイッチを操作し静止画撮影を行う。撮影スイッチの入力を検知した制御回路２７は、可動ミラー５を跳ね上げて光路外に退避させると共に、撮影光源１４を発光する。撮影光源１４から発した光束は、観察光と同様に絞り１６のリング状開口を通過し、レンズ１７を通り、孔あきミラー２の周辺のミラー部により左方に反射され、対物レンズ１を介して眼底Ｅｒを照明する。このように照明された眼底像は、再び対物レンズ１、孔あきミラー２の孔部を通過し、撮影レンズ３を通り撮像手段６の撮像面に結像し、撮像手段６はテレビ信号をＡ／Ｄ変換部２０に出力する。 After confirming that the shooting range, position, and focus are good, the photographer operates a shooting switch (not shown) to take a still image. The control circuit 27 that has detected the input of the photographing switch flips up the movable mirror 5 to retreat from the optical path and emits the photographing light source 14. The light beam emitted from the imaging light source 14 passes through the ring-shaped opening of the diaphragm 16 like the observation light, passes through the lens 17, is reflected to the left by the mirror part around the perforated mirror 2, and passes through the objective lens 1. To illuminate the fundus Er. The illuminated fundus image passes through the hole of the objective lens 1 and the perforated mirror 2 again, forms an image on the imaging surface of the imaging means 6 through the imaging lens 3, and the imaging means 6 converts the TV signal into A. / D conversion unit 20 for output.

画像制御部２６は撮像手段６が出力するテレビ信号を撮影光源１４の発光と同期をとり、Ａ／Ｄ変換部２０によりデジタルデータに変換した後に、フレームメモリ２１に取り込む。このとき、Ａ／Ｄ変換時のビット数は、通常ではカメラのＳＮ比が６０ｄＢ以上あることから、最終的なファイルとして出力する際の８ビットよりも多いビット数である１０ビットで変換を行う。 The image control unit 26 synchronizes the television signal output from the imaging unit 6 with the light emission of the imaging light source 14, converts it into digital data by the A / D conversion unit 20, and then captures it in the frame memory 21. At this time, since the S / N ratio of the camera is usually 60 dB or more, the number of bits at the time of A / D conversion is converted with 10 bits, which is a bit number larger than 8 bits when output as a final file. .

ここで、カラー撮影の場合には、バリアフィルタ４及びエキサイタフィルタ１５を光路外に退避させ、蛍光撮影の場合には、バリアフィルタ４及びエキサイタフィルタ１５を光路内に挿入するようにしておく。これらの選択は選択スイッチ２９により行う。 Here, in the case of color photography, the barrier filter 4 and exciter filter 15 are retracted out of the optical path, and in the case of fluorescence photography, the barrier filter 4 and exciter filter 15 are inserted into the optical path. These selections are made by the selection switch 29.

次に、上述のようにして得られた画像データに対し、ルックアップテーブル２２を設定することにより、画像データを出力する。図３（ａ）はカラー眼底像全体、（ｂ）は蛍光眼底像全体を表しており、Ｅｒ’は眼底像、Ｅｏは黄班部、Ｅａはアパーチャ部を示している。また、それぞれのヒストグラム図は図６（ａ）、（ｂ）にそれぞれ対応しており、横軸は輝度、縦軸は頻度である。 Next, the image data is output by setting the lookup table 22 for the image data obtained as described above. 3A shows the entire color fundus image, FIG. 3B shows the entire fluorescent fundus image, Er ′ shows the fundus image, Eo shows the macula portion, and Ea shows the aperture portion. Each histogram diagram corresponds to FIGS. 6A and 6B, the horizontal axis represents luminance, and the vertical axis represents frequency.

ルックアップテーブル設定部２３は図４、図５で示すルックアップテーブル２２を選択し、カラー画像用には、Ｄ及びＥにより変極点を持つようなルックアップテーブル、即ち図６（ａ）の輝度範囲Ｈの部分を強調するようなルックアップテーブルを適用し、蛍光撮影の際には、Ｄ’及びＥ’で変極点を持つようなルックアップテーブル、即ち図６（ｂ）の輝度範囲Ｈ’の部分を強調するようなルックアップテーブルを適用する。 The look-up table setting unit 23 selects the look-up table 22 shown in FIGS. 4 and 5. For a color image, the look-up table having an inflection point due to D and E, that is, the luminance shown in FIG. A look-up table that emphasizes the portion of the range H is applied, and at the time of fluorescent photographing, a look-up table having inflection points at D ′ and E ′, that is, the luminance range H ′ in FIG. Apply a look-up table that emphasizes this part.

ここで、図４のＤ、Ｅはそれぞれ図６（ａ）のＤ、Ｅに相当し、同様にＤ’、Ｅ’はそれぞれ図６（ｂ）のＤ’、Ｅ’に相当している。このようにして設定したルックアップテーブル２２を介して、フレームメモリ２１内の眼底画像データの階調変換を行う。 Here, D and E in FIG. 4 correspond to D and E in FIG. 6A, respectively, and similarly D ′ and E ′ correspond to D ′ and E ′ in FIG. 6B, respectively. The tone conversion of the fundus image data in the frame memory 21 is performed via the lookup table 22 set in this way.

また必要に応じて、画像制御部２６はフレームメモリの画像データを選択されたルックアップテーブル２２で階調変換した後に、表示用メモリ２４に書き込み、書き込まれた画像データを、Ｄ／Ａ変換してテレビモニタ３２に出力することにより、撮影者が画像を確認することができる。 If necessary, the image control unit 26 performs gradation conversion on the image data in the frame memory using the selected look-up table 22, and then writes the image data in the display memory 24, and performs D / A conversion on the written image data. By outputting to the television monitor 32, the photographer can check the image.

更に、画像制御部２６はこの画像データをＭＯ、ＭＤ、ＤＶＤ−ＲＡＭ、ＶＴＲテープ、ハードディスク等の記憶保持可能な記録媒体２５への書き込みを行う。 Further, the image control unit 26 writes the image data to a recording medium 25 that can store and hold such as MO, MD, DVD-RAM, VTR tape, and hard disk.

なお、本実施例では、カラー撮影又は蛍光撮影のモードを選択スイッチ２９等により行ったが、バリアフィルタ４又はエキサイタフィルタ１５の光路内への挿入により、モード検出するようにしてもよい。 In this embodiment, the color photographing mode or the fluorescent photographing mode is performed by the selection switch 29 or the like. However, the mode may be detected by inserting the barrier filter 4 or the exciter filter 15 into the optical path.

６撮像手段
１０テレビカメラ
１１観察光源
１４撮影光源
２０Ａ／Ｄ変換部
２１フレームメモリ
２２ルックアップテーブル
２３ルックアップテーブル設定部
２５記録媒体
２６画像制御部
２７制御回路
３０、３２テレビモニタ 6 Imaging means 10 Television camera 11 Observation light source 14 Imaging light source 20 A / D conversion unit 21 Frame memory 22 Look-up table 23 Look-up table setting unit 25 Recording medium 26 Image control unit 27 Control circuit 30, 32 TV monitor

Claims

An illumination optical system for illuminating the eye to be examined;
An imaging optical system that captures a still image of the eye to be examined based on return light from the eye to be examined;
An exciter filter detachably provided in the illumination optical system;
A barrier filter detachably provided in the imaging optical system;
A selection means for selecting one of the fluorescent photographing mode and the color photographing mode;
When the fluorescence imaging mode is selected by the selection unit, the exciter filter and the barrier filter are inserted into the illumination optical system and the imaging optical system, respectively, while the color imaging mode is selected by the selection unit A filter control unit for retracting the exciter filter and the barrier filter from the illumination optical system and the imaging optical system, respectively,
When the fluorescence imaging mode is selected by the selection unit, an image signal obtained by the imaging optical system is converted using a first look-up table showing a first gradation conversion characteristic for the fluorescence imaging mode. On the other hand, when a color photographing mode is selected by the selection means, a second look-up table showing a second gradation conversion characteristic for the color photographing mode, which is a characteristic different from the first gradation conversion characteristic. A conversion unit for converting an image signal obtained by the imaging optical system using
An ophthalmologic apparatus comprising:

An objective lens provided at a position facing the eye to be examined;
A perforated mirror provided on the opposite side to the eye direction of the objective lens;
A light source that illuminates the eye to be examined through the objective lens and the perforated mirror;
A camera that receives return light from the eye to be examined through the objective lens and the perforated mirror, and captures a still image of the eye to be examined;
An exciter filter provided in a first optical path connecting the light source and the objective lens so as to be detachable;
A barrier filter detachably provided in a second optical path connecting the objective lens and the camera;
A selection means for selecting one of the fluorescent photographing mode and the color photographing mode;
When the fluorescence photographing mode is selected by the selection unit, the exciter filter and the barrier filter are inserted into the first optical path and the second optical path, respectively, while the color photographing mode is selected by the selection unit. A filter controller that retracts the exciter filter and the barrier filter from the first optical path and the second optical path, respectively,
While converting the image signal obtained by the camera using the first look-up table showing the first gradation conversion characteristics for the fluorescence imaging mode when the fluorescence imaging mode is selected by the selection means, When a color photographing mode is selected by the selection unit, a second look-up table showing a second gradation conversion characteristic for the color photographing mode, which is a characteristic different from the first gradation conversion characteristic, is used. A conversion unit for converting an image signal obtained by the camera;
An ophthalmologic apparatus comprising:

An objective lens provided at a position facing the eye to be examined;
A perforated mirror provided on the opposite side to the eye direction of the objective lens;
A light source that illuminates the eye to be examined through the objective lens and the perforated mirror;
A camera that receives return light from the eye to be examined through the objective lens and the perforated mirror, and captures a still image of the eye to be examined;
An exciter filter provided in a first optical path connecting the light source and the objective lens so as to be detachable;
A barrier filter detachably provided in a second optical path connecting the objective lens and the camera;
A memory for storing an image signal indicating the still image obtained by the camera;
A selection means for selecting either fluorescent photography or color photography;
When the fluorescence photographing mode is selected by the selection unit, the exciter filter and the barrier filter are inserted into the first optical path and the second optical path, respectively, while the color photographing mode is selected by the selection unit. A filter controller that retracts the exciter filter and the barrier filter from the first optical path and the second optical path, respectively,
When the fluorescence imaging mode is selected by the selection unit, the image signal stored in the memory is converted using a first look-up table indicating a first gradation conversion characteristic for the fluorescence imaging mode. A second look-up table showing a second gradation conversion characteristic for the color photographing mode, which is a characteristic different from the first gradation conversion characteristic when a color photographing mode is selected by the selection means. A conversion unit for converting the image signal stored in the memory using,
An ophthalmologic apparatus comprising:

An objective lens provided at a position facing the eye to be examined;
A perforated mirror provided on the opposite side to the eye direction of the objective lens;
A light source that illuminates the eye to be examined through the objective lens and the perforated mirror;
A camera that receives return light from the eye to be examined through the objective lens and the perforated mirror, and captures a still image of the eye to be examined;
An exciter filter provided in a first optical path connecting the light source and the objective lens so as to be detachable;
A barrier filter detachably provided in a second optical path connecting the objective lens and the camera;
A selection means for selecting one of the fluorescent photographing mode and the color photographing mode;
When the fluorescence photographing mode is selected by the selection unit, the exciter filter and the barrier filter are inserted into the first optical path and the second optical path, respectively, while the color photographing mode is selected by the selection unit. A filter controller that retracts the exciter filter and the barrier filter from the first optical path and the second optical path, respectively,
While converting the image signal obtained by the camera using the first look-up table showing the first gradation conversion characteristics for the fluorescence imaging mode when the fluorescence imaging mode is selected by the selection means, When a color photographing mode is selected by the selection unit, a second look-up table showing a second gradation conversion characteristic for the color photographing mode, which is a characteristic different from the first gradation conversion characteristic, is used. A conversion unit for converting an image signal obtained by the camera;
A monitor for displaying the image signal converted by the converter;
An ophthalmologic apparatus comprising:

An objective lens provided at a position facing the eye to be examined;
A perforated mirror provided on the opposite side to the eye direction of the objective lens;
A light source that illuminates the eye to be examined through the objective lens and the perforated mirror;
A camera that receives return light from the eye to be examined through the objective lens and the perforated mirror, and captures a still image of the eye to be examined;
An exciter filter provided in a first optical path connecting the light source and the objective lens so as to be detachable;
A barrier filter detachably provided in a second optical path connecting the objective lens and the camera;
A selection means for selecting one of the fluorescent photographing mode and the color photographing mode;
When the fluorescence photographing mode is selected by the selection unit, the exciter filter and the barrier filter are inserted into the first optical path and the second optical path, respectively, while the color photographing mode is selected by the selection unit. A filter controller that retracts the exciter filter and the barrier filter from the first optical path and the second optical path, respectively,
While converting the image signal obtained by the camera using the first look-up table showing the first gradation conversion characteristics for the fluorescence imaging mode when the fluorescence imaging mode is selected by the selection means, When a color photographing mode is selected by the selection unit, a second look-up table showing a second gradation conversion characteristic for the color photographing mode, which is a characteristic different from the first gradation conversion characteristic, is used. A conversion unit for converting an image signal obtained by the camera;
A memory for storing the image signal converted by the conversion unit;
An ophthalmologic apparatus comprising:

An objective lens provided at a position facing the eye to be examined;
A perforated mirror provided on the opposite side to the eye direction of the objective lens;
A light source that illuminates the eye to be examined through the objective lens and the perforated mirror;
A camera that receives return light from the eye to be examined through the objective lens and the perforated mirror, and captures a still image of the eye to be examined;
An exciter filter provided in a first optical path connecting the light source and the objective lens so as to be detachable;
A barrier filter detachably provided in a second optical path connecting the objective lens and the camera;
A selection means for selecting one of the fluorescent photographing mode and the color photographing mode;
When the fluorescence photographing mode is selected by the selection unit, the exciter filter and the barrier filter are inserted into the first optical path and the second optical path, respectively, while the color photographing mode is selected by the selection unit. A filter controller that retracts the exciter filter and the barrier filter from the first optical path and the second optical path, respectively,
While converting the image signal obtained by the camera using the first look-up table showing the first gradation conversion characteristics for the fluorescence imaging mode when the fluorescence imaging mode is selected by the selection means, When a color photographing mode is selected by the selection unit, a second look-up table showing a second gradation conversion characteristic for the color photographing mode, which is a characteristic different from the first gradation conversion characteristic, is used. A conversion unit for converting an image signal obtained by the camera;
A memory for storing the image signal converted by the conversion unit;
A monitor for displaying the image signal converted by the converter;
An ophthalmologic apparatus comprising:

The ophthalmologic apparatus according to any one of claims 2 to 6, further comprising a diaphragm having a ring-shaped opening between the light source and the perforated mirror.

The ophthalmologic apparatus according to claim 1, wherein the first gradation conversion characteristic and the second gradation conversion characteristic are nonlinear characteristics.

An illumination optical system for illuminating the eye to be examined;
An imaging optical system that captures a still image of the eye to be examined based on return light from the eye to be examined;
An exciter filter detachably provided in the illumination optical system;
A barrier filter detachably provided in the imaging optical system;
A selection means for selecting one of the fluorescent photographing mode and the color photographing mode;
When the fluorescence imaging mode is selected by the selection unit, the exciter filter and the barrier filter are inserted into the illumination optical system and the imaging optical system, respectively, while the color imaging mode is selected by the selection unit A filter control unit for retracting the exciter filter and the barrier filter from the illumination optical system and the imaging optical system, respectively,
When the fluorescence imaging mode is selected by the selection unit, an image signal obtained by the imaging optical system is converted using a first look-up table showing a first gradation conversion characteristic for the fluorescence imaging mode. On the other hand, when a color photographing mode is selected by the selection means, a second look-up table showing a second gradation conversion characteristic for the color photographing mode, which is a characteristic different from the first gradation conversion characteristic. A conversion method comprising a conversion step of converting an image signal obtained by the imaging optical system using

An objective lens provided at a position facing the eye to be examined;
A perforated mirror provided on the opposite side to the eye direction of the objective lens;
A light source that illuminates the eye to be examined through the objective lens and the perforated mirror;
A camera that receives return light from the eye to be examined through the objective lens and the perforated mirror, and captures a still image of the eye to be examined;
An exciter filter provided in a first optical path connecting the light source and the objective lens so as to be detachable;
A barrier filter detachably provided in a second optical path connecting the objective lens and the camera;
A selection means for selecting one of the fluorescent photographing mode and the color photographing mode;
When the fluorescence photographing mode is selected by the selection unit, the exciter filter and the barrier filter are inserted into the first optical path and the second optical path, respectively, while the color photographing mode is selected by the selection unit. An ophthalmic apparatus comprising: a filter control unit that retracts the exciter filter and the barrier filter from the first optical path and the second optical path, respectively,
While converting the image signal obtained by the camera using the first look-up table showing the first gradation conversion characteristics for the fluorescence imaging mode when the fluorescence imaging mode is selected by the selection means, When a color photographing mode is selected by the selection unit, a second look-up table showing a second gradation conversion characteristic for the color photographing mode, which is a characteristic different from the first gradation conversion characteristic, is used. A conversion step of converting an image signal obtained by the camera.

An objective lens provided at a position facing the eye to be examined;
A perforated mirror provided on the opposite side to the eye direction of the objective lens;
A light source that illuminates the eye to be examined through the objective lens and the perforated mirror;
A camera that receives return light from the eye to be examined through the objective lens and the perforated mirror, and captures a still image of the eye to be examined;
An exciter filter provided in a first optical path connecting the light source and the objective lens so as to be detachable;
A barrier filter detachably provided in a second optical path connecting the objective lens and the camera;
A memory for storing an image signal indicating the still image obtained by the camera;
A selection means for selecting either fluorescent photography or color photography;
When the fluorescence photographing mode is selected by the selection unit, the exciter filter and the barrier filter are inserted into the first optical path and the second optical path, respectively, while the color photographing mode is selected by the selection unit. An ophthalmic apparatus comprising: a filter control unit that retracts the exciter filter and the barrier filter from the first optical path and the second optical path, respectively,
When the fluorescence imaging mode is selected by the selection unit, the image signal stored in the memory is converted using a first look-up table indicating a first gradation conversion characteristic for the fluorescence imaging mode. A second look-up table showing a second gradation conversion characteristic for the color photographing mode, which is a characteristic different from the first gradation conversion characteristic when a color photographing mode is selected by the selection means. A conversion method comprising a conversion step of converting an image signal stored in the memory using the conversion method.

An objective lens provided at a position facing the eye to be examined;
A perforated mirror provided on the opposite side to the eye direction of the objective lens;
A light source that illuminates the eye to be examined through the objective lens and the perforated mirror;
A camera that receives return light from the eye to be examined through the objective lens and the perforated mirror, and captures a still image of the eye to be examined;
An exciter filter provided in a first optical path connecting the light source and the objective lens so as to be detachable;
A barrier filter detachably provided in a second optical path connecting the objective lens and the camera;
A selection means for selecting one of the fluorescent photographing mode and the color photographing mode;
When the fluorescence photographing mode is selected by the selection unit, the exciter filter and the barrier filter are inserted into the first optical path and the second optical path, respectively, while the color photographing mode is selected by the selection unit. A filter controller that retracts the exciter filter and the barrier filter from the first optical path and the second optical path, respectively,
An ophthalmologic apparatus comprising a monitor,
While converting the image signal obtained by the camera using the first look-up table showing the first gradation conversion characteristics for the fluorescence imaging mode when the fluorescence imaging mode is selected by the selection means, When a color photographing mode is selected by the selection unit, a second look-up table showing a second gradation conversion characteristic for the color photographing mode, which is a characteristic different from the first gradation conversion characteristic, is used. Converting the image signal obtained by the camera,
A display step of displaying the image signal converted in the conversion step on the monitor.

An objective lens provided at a position facing the eye to be examined;
A perforated mirror provided on the opposite side to the eye direction of the objective lens;
A light source that illuminates the eye to be examined through the objective lens and the perforated mirror;
A camera that receives return light from the eye to be examined through the objective lens and the perforated mirror, and captures a still image of the eye to be examined;
An exciter filter provided in a first optical path connecting the light source and the objective lens so as to be detachable;
A barrier filter detachably provided in a second optical path connecting the objective lens and the camera;
A selection means for selecting one of the fluorescent photographing mode and the color photographing mode;
When the fluorescence photographing mode is selected by the selection unit, the exciter filter and the barrier filter are inserted into the first optical path and the second optical path, respectively, while the color photographing mode is selected by the selection unit. An ophthalmic apparatus comprising: a filter control unit that retracts the exciter filter and the barrier filter from the first optical path and the second optical path, respectively,
While converting the image signal obtained by the camera using the first look-up table showing the first gradation conversion characteristics for the fluorescence imaging mode when the fluorescence imaging mode is selected by the selection means, When a color photographing mode is selected by the selection unit, a second look-up table showing a second gradation conversion characteristic for the color photographing mode, which is a characteristic different from the first gradation conversion characteristic, is used. Converting the image signal obtained by the camera,
And a storage step of storing the image signal converted in the conversion step in a memory.

An objective lens provided at a position facing the eye to be examined;
A perforated mirror provided on the opposite side to the eye direction of the objective lens;
A light source that illuminates the eye to be examined through the objective lens and the perforated mirror;
A camera that receives return light from the eye to be examined through the objective lens and the perforated mirror, and captures a still image of the eye to be examined;
An exciter filter provided in a first optical path connecting the light source and the objective lens so as to be detachable;
A barrier filter detachably provided in a second optical path connecting the objective lens and the camera;
A selection means for selecting one of the fluorescent photographing mode and the color photographing mode;
When the fluorescence photographing mode is selected by the selection unit, the exciter filter and the barrier filter are inserted into the first optical path and the second optical path, respectively, while the color photographing mode is selected by the selection unit. A filter controller that retracts the exciter filter and the barrier filter from the first optical path and the second optical path, respectively,
An ophthalmologic apparatus comprising a monitor,
While converting the image signal obtained by the camera using the first look-up table showing the first gradation conversion characteristics for the fluorescence imaging mode when the fluorescence imaging mode is selected by the selection means, When a color photographing mode is selected by the selection unit, a second look-up table showing a second gradation conversion characteristic for the color photographing mode, which is a characteristic different from the first gradation conversion characteristic, is used. Converting the image signal obtained by the camera,
A storage step of storing the image signal converted in the conversion step in a memory;
A display step of displaying the image signal converted in the conversion step on the monitor.