JP3514557B2 - Color shift reduction device for electronic endoscopes - Google Patents
Color shift reduction device for electronic endoscopesInfo
- Publication number
- JP3514557B2 JP3514557B2 JP25775995A JP25775995A JP3514557B2 JP 3514557 B2 JP3514557 B2 JP 3514557B2 JP 25775995 A JP25775995 A JP 25775995A JP 25775995 A JP25775995 A JP 25775995A JP 3514557 B2 JP3514557 B2 JP 3514557B2
- Authority
- JP
- Japan
- Prior art keywords
- color
- output
- signal
- storage means
- frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Color Television Image Signal Generators (AREA)
- Endoscopes (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、面順次方式で撮像
する電子内視鏡装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic endoscope apparatus for picking up images in a frame sequential method.
【０００２】[0002]
【従来の技術】電子内視鏡装置は、面順次で所望の色画
像を撮像し、この撮像により得た面順次画像信号を同時
式に変換して、カラー画像として再生するものである。
図３は、従来技術を示すブロック図である。 照明ラン
プ５からの光は、集光レンズ６、色フィルタディスク７
およびライトガイド４を介して、内視鏡先端部より被写
体１を照明する。色フィルタディスク７は、それぞれ中
心角１２０°の赤色フィルタ、緑色フィルタ、及び青色
フィルタを有し、モータ８によって所定の回転速度(例
えば、２０ｒｐｓ)で回転している。これにより、照明
ランプ５からの光は、この回転する色フィルタディスク
７を介して、１／６０秒(回転速度が、２０ｒｐｓの場
合)の周期で、順次変化する、赤(Ｒ)、緑(Ｇ)、青(Ｂ)
の各色の照明光となり、ライトガイド４を介して被写体
１を照明する。そして、内視鏡先端部に設けられた撮像
レンズ２により、Ｒ，Ｇ，Ｂの各照明光によって照明さ
れた被写体１を撮像し、これをＣＣＤセンサ３の受光部
に結像する。 ＣＣＤセンサ３は、結像した入射光を光
電変換し、各照明光に対応した面順次のＲ，Ｇ，Ｂ画像
信号を、アンプ１１を介してＡ／Ｄ変換器（図中では、
Ａ／Ｄと略記)１２に出力する。2. Description of the Related Art An electronic endoscope apparatus picks up a desired color image in a frame sequential manner, simultaneously converts the frame sequential image signals obtained by the image pickup, and reproduces it as a color image.
FIG. 3 is a block diagram showing a conventional technique. Light from the illumination lamp 5 is collected by the condenser lens 6 and the color filter disk 7.
The subject 1 is illuminated from the tip of the endoscope via the light guide 4. The color filter disk 7 has a red filter, a green filter, and a blue filter each having a central angle of 120 °, and is rotated by a motor 8 at a predetermined rotation speed (for example, 20 rps). As a result, the light from the illumination lamp 5 sequentially changes through the rotating color filter disk 7 at a cycle of 1/60 seconds (when the rotation speed is 20 rps), red (R) and green ( G), blue (B)
The illumination light of each color is used to illuminate the subject 1 through the light guide 4. Then, the image pickup lens 2 provided at the tip of the endoscope picks up an image of the subject 1 illuminated by each of the R, G, and B illumination lights, and forms an image on the light receiving portion of the CCD sensor 3. The CCD sensor 3 photoelectrically converts the incident light that has formed an image, and outputs the frame sequential R, G, B image signals corresponding to each illumination light through an amplifier 11 to an A / D converter (in the figure,
(Abbreviated as A / D) 12 is output.
【０００３】Ａ／Ｄ変換器１２は、入力した面順次の
Ｒ，Ｇ，Ｂ画像信号(アナログ信号)を１画素ずつディジ
タル信号に変換し、それぞれ、Ｒ，Ｇ，Ｂのフィールド
メモリ（図中では、Ｒメモリ、Ｇメモリ、Ｂメモリと略
記）１３，１４，１５に出力する。 フィールドメモリ
１３，１４，１５は、フィールド選別用パルス発生回路
１０によって制御される。フィールド選別用パルス発生
回路１０は、色フィルタ位置検出器９から、Ｒ，Ｇ，Ｂ
の各照明光に同期した信号を得ており、この信号によっ
て、各照明光に対応したＲ，Ｇ，Ｂ画像信号が、それぞ
れ対応したフィールドメモリに記憶されるよう、フィー
ルドメモリ１３，１４，１５を制御し、順次、各フィー
ルドメモリの記憶内容を更新させる。これらのフィール
ドメモリ１３，１４，１５に記憶されたＲ，Ｇ，Ｂ画像
信号は、同時に読み出され、Ｄ／Ａ変換器（図中では、
Ｄ／Ａと略記）１６，１７，１８でアナログ信号に変換
された後、表示制御回路１９に加えられ、モニタテレビ
２０に映し出される。The A / D converter 12 converts the input frame-sequential R, G, B image signals (analog signals) into digital signals pixel by pixel, and outputs R, G, B field memories (in the figure, respectively). , (Abbreviated as R memory, G memory, B memory) 13, 14, 15. The field memories 13, 14, and 15 are controlled by the field selection pulse generation circuit 10. The field selection pulse generation circuit 10 outputs the R, G, B from the color filter position detector 9.
Of the field lights 13, 14, 15 so that the R, G, B image signals corresponding to the respective illumination lights are stored in the corresponding field memories. Is controlled to sequentially update the stored contents of each field memory. The R, G, B image signals stored in these field memories 13, 14, 15 are read out at the same time, and the D / A converter (in the figure,
After being converted into analog signals by D / A) 16, 17, and 18, they are added to the display control circuit 19 and displayed on the monitor television 20.
【０００４】[0004]
【発明が解決しようとする課題】従来の面順次方式電子
内視鏡は、各色画像信号が３フィールド毎にしか得られ
ないため、動きの早い被写体の撮影時、色ずれが発生す
る欠点がある。本発明は、これらの欠点を除去し、動き
の早い被写体の撮影時にも、色ずれの少ない映像を提供
することを目的とする。The conventional frame-sequential electronic endoscope has a drawback that color shift occurs when a fast-moving subject is photographed because each color image signal is obtained only every three fields. . SUMMARY OF THE INVENTION It is an object of the present invention to eliminate these drawbacks and provide an image with little color shift even when shooting a fast-moving subject.
【０００５】[0005]
【課題を解決するための手段】本発明は上記目的を達成
するため、面順次方式の電子内視鏡において、各色別の
画像を順次撮像し面順次の各色画像信号を得る手段と、
該面順次の各色画像信号を色別に記憶し同時に出力する
各色の第１の記憶手段と、該各色の第１の記憶手段のそ
れぞれの出力を記憶する各色の第２の記憶手段と、上記
各色の第１の記憶手段の出力と上記各色の第２の記憶手
段の出力をそれぞれ面順次の周期で加算比率を変えて加
算しそれぞれ各色の画像信号を出力する各色の信号処理
手段とを有する構成としたものである。また、上記各色
の第１の記憶手段の出力をＸ、上記各色の第２の記憶手
段の出力をＹ、上記各色の信号処理手段の出力をＺとし
た場合、上記各色の信号処理手段における処理を、
Ｚ＝ｋＸ＋(１−ｋ)Ｙ 但し、加算比率ｋは、０＜ｋ
≦１ の範囲内で面順次の周期で、繰り返し切り替わる
となるごとく構成したものである。In order to achieve the above object, the present invention provides a frame-sequential electronic endoscope for sequentially capturing images of respective colors to obtain a frame-sequential image signal of each color.
First storage means of each color for storing the image signals of each color of the frame sequential for each color and outputting at the same time, Second storage means of each color for storing each output of the first storage means of each color, and each color Of the first storage means and the output of the second storage means for each color are added in different frame-sequential cycles with different addition ratios, and signal signals for each color are output to output image signals for each color. It is what When the output of the first storage means for each color is X, the output of the second storage means for each color is Y, and the output of the signal processing means for each color is Z, the processing in the signal processing means for each color is performed. Z = kX + (1-k) Y where the addition ratio k is 0 <k
It is configured such that it is repeatedly switched at a frame-sequential cycle within a range of ≦ 1.
【０００６】さらに、上記各色の信号処理手段を、上記
各色の第１の記憶手段の出力信号レベルをそれぞれ１／
３および２／３に減衰する各色の第１の減衰手段と、上
記各色の第２の記憶手段の出力信号レベルをそれぞれ２
／３および１／３に減衰する各色の第２の各色減衰手段
と、面順次周期で、それぞれ上記各色の第１の減衰手段
の各信号出力および減衰しない上記各色の第１の記憶手
段の信号出力を順次切換え出力する各色の第１の切換手
段と、それぞれ上記各色の第２の減衰手段の各信号出力
および無信号出力を順次切換え出力する各色の第２の切
換手段と、上記各色の第１の切換手段の出力と上記各色
の第２の切換手段の出力をそれぞれ加算する各色の加算
手段により構成したものである。これにより、面順次の
周期で、各色の画像信号を得ることができるため、動き
の早い被写体の撮影時にも、色ずれの少ない映像の得ら
れる電子内視鏡装置を実現できる。Further, the signal processing means for each color is set to 1 / the output signal level of the first storage means for each color.
The output signal levels of the first attenuating means for each color that attenuates to 3 and 2/3 and the second storing means for each color are set to 2 respectively.
Second color attenuating means of each color that attenuates to ⅓ and ⅓, each signal output of the first attenuating means of each of the above colors and the signal of the first storing means of each of the above color that does not attenuate in a frame sequential period. A first switching means for each color for sequentially switching and outputting the output, a second switching means for each color for sequentially switching and outputting each signal output and no signal output of the second attenuating means for each color, and a first switching means for each color. The output of the switching unit 1 and the output of the second switching unit of each color are added to add each color. This makes it possible to obtain image signals of the respective colors in a frame-sequential cycle, so that it is possible to realize an electronic endoscope apparatus capable of obtaining an image with little color shift even when a fast-moving subject is photographed.
【０００７】[0007]
【発明の実施の形態】以下、本発明の一実施例を図１に
より説明する。図２は、本発明の一実施例の動作を説明
する信号波形図である。図１において、被写体１からモ
ニタテレビ２０までは、従来技術で説明してあるため、
ここでは説明を省略する。図１のＡ／Ｄ変換器１２から
は、図２の(Ｂ)に示す、面順次の画像信号が出力され
る。 以下の説明では、Ｒ信号のみについて行うが、
Ｇ，Ｂ信号も、同様の動作である。図２の(Ｂ)に示す面
順次画像信号は、第１の記憶手段である、Ｒメモリ１３
に入力する。このＲメモリ１３の出力信号を、図２の
(Ｃ)に、Ｒメモリ１３出力として示す。 このＲメモリ
１３の出力信号は、第２の記憶手段である、Ｒメモリ２
２に供給される。このＲメモリ２２の出力信号を、図２
の(Ｄ)にＲメモリ２２出力として示す。Ｒメモリ１３の
出力は、第１の減衰手段である、レベルを１／３にする
減衰器(図中では、１／３と表記)２５と２／３にする減
衰器(図中では、２／３と表記）２６に入力される。こ
の減衰器２５，２６の出力およびＲメモリ１３の出力
は、第１の切換手段である切換器３７に入力される。こ
の切換器３７の出力は、加算器４３に入力される。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIG. FIG. 2 is a signal waveform diagram for explaining the operation of the embodiment of the present invention. In FIG. 1, since the subject 1 to the monitor television 20 have been described in the related art,
The description is omitted here. The A / D converter 12 shown in FIG. 1 outputs the frame-sequential image signal shown in FIG. In the following description, only the R signal will be described.
The G and B signals have the same operation. The frame sequential image signal shown in FIG. 2B is the R memory 13 which is the first storage means.
To enter. The output signal of the R memory 13 is shown in FIG.
It is shown as an output of the R memory 13 in (C). The output signal of the R memory 13 is the second storage means, that is, the R memory 2
2 is supplied. The output signal of the R memory 22 is shown in FIG.
(D) is shown as the output of the R memory 22. The output of the R memory 13 is the first attenuator, that is, the attenuators that make the level 1/3 (denoted as 1/3 in the figure) 25 and the attenuators that make it 2/3 (in the figure, 2). (Notated as / 3) 26. The outputs of the attenuators 25 and 26 and the output of the R memory 13 are input to the switching device 37 which is the first switching means. The output of the switch 37 is input to the adder 43.
【０００８】Ｒメモリ２２の出力は、第２の減衰手段で
ある、レベルを２／３にする減衰器２７、１／３にする
減衰器２８に入力される。この減衰器２７，２８の出力
は、第２の切換手段である切換器３８に入力される。こ
の切換器３８の出力は、加算器４３に入力される。切換
器３７，３８は、フィールド選別用パルス発生器１０か
らの信号を基準に、メモリ制御回路２１の出力信号によ
り制御される。切換器３７，３８の出力信号は、図２の
（Ａ)に示す、各フィールドを表すＶＤパルスが１番目
の時は、Ｒメモリ１３の出力Ｒ1 を１／３に減衰した信
号を、切換器３７から出力し、Ｒメモリ２２の出力Ｒ0
を２／３に減衰した信号を、切換器３８から出力する。
そして、加算器４３において、これらの信号が加算さ
れ、2/3Ｒ0＋1/3Ｒ1の信号となる。The output of the R memory 22 is input to a second attenuator, that is, an attenuator 27 that makes the level 2/3 and an attenuator 28 that makes the level 1/3. The outputs of the attenuators 27 and 28 are input to the switching device 38 which is the second switching means. The output of the switch 38 is input to the adder 43. The switches 37 and 38 are controlled by the output signal of the memory control circuit 21 on the basis of the signal from the field selection pulse generator 10. As the output signals of the switching devices 37 and 38, when the VD pulse representing each field is the first as shown in FIG. 2A, a signal obtained by attenuating the output R 1 of the R memory 13 to 1/3 is switched. Output from the device 37 and output from the R memory 22 R 0
The signal that is attenuated by 2/3 is output from the switch 38.
Then, in the adder 43, these signals are added to form a signal of 2 / 3R 0 + 1 / 3R 1 .
【０００９】図２の(Ａ)のＶＤパルスが２番目の時は、
Ｒメモリ１３の出力Ｒ1 を２／３に減衰した信号を切換
器３７から出力し、Ｒメモリ２２の出力Ｒ0 を１／３に
減衰した信号を切換器３８から出力する。これら切換器
３７，３８の出力は、加算器４３で加算され、1/3Ｒ0＋
2/3Ｒ1の信号となる。図２の(Ａ)に示すＶＤパルスが３
番目の時は、Ｒメモリ１３の出力Ｒ1 が、そのまま切換
器３７から出力される。この時、切換器３８からの出力
は用いない。このため、加算器４３では、Ｒメモリ１３
の出力Ｒ1 が、そのまま出力される。以下、同様にし
て、加算器４３からは、2/3Ｒ1＋1/3Ｒ2 ，1/3Ｒ1＋2/3
Ｒ2，Ｒ2，……の出力が得られる。加算器４３の出力
は、Ｄ／Ａ変換器１６を介してアナログ信号に変換され
た後、表示制御回路１９に加えられ、モニタテレビ２０
に映し出される。When the VD pulse of FIG. 2A is the second,
A signal obtained by attenuating the output R 1 of the R memory 13 to 2/3 is output from the switch 37, and a signal obtained by attenuating the output R 0 of the R memory 22 to 1/3 is output from the switch 38. The outputs of the switching devices 37 and 38 are added by the adder 43, and 1 / 3R 0 +
2 / 3R 1 signal. The VD pulse shown in FIG.
At the second time, the output R 1 of the R memory 13 is directly output from the switch 37. At this time, the output from the switch 38 is not used. Therefore, in the adder 43, the R memory 13
Output R 1 is output as it is. Thereafter, similarly, from the adder 43, 2 / 3R 1 + 1 / 3R 2 and 1 / 3R 1 +2/3
Outputs of R 2 , R 2 , ... Are obtained. The output of the adder 43 is converted into an analog signal via the D / A converter 16 and then added to the display control circuit 19 to monitor the TV 20.
Is projected on.
【００１０】ここで、Ｇ，Ｂ信号についても、同様の動
作が行なわれ、加算器４４からは、……，Ｇ1 ，2/3Ｇ1
＋1/3Ｇ2 ，1/3Ｇ1＋2/3Ｇ2 ，……の出力が得られ、加
算器４５からは、……，1/3Ｂ0＋2/3Ｂ1 ，Ｂ1 ，2/3Ｂ
1＋1/3Ｂ2 ，……の出力が得られる。このようにして、
本来、３フィールド毎にしか得られない各色信号が、あ
たかも各フィールドに対応した信号として得られる。そ
のため、各フィールドにおける各色信号間の時間差、位
相差が減少し、色ずれが低減する。なお、本実施例は、
フィールド順次方式を例にとって説明したが、本発明
は、これに限定されるものではなく、フレーム順次方式
にも、同様に適用できるものである。Here, the same operation is performed for the G and B signals, and the adder 44 outputs ..., G 1 , 2 / 3G 1
The output of + 1 / 3G 2 , 1 / 3G 1 + 2 / 3G 2 , ... Is obtained, and from the adder 45, 1 / 3B 0 + 2 / 3B 1 , B 1 , 2 / 3B
The output of 1 + 1 / 3B 2 , ... Is obtained. In this way
Originally, each color signal which can be obtained only for every three fields is obtained as a signal corresponding to each field. Therefore, the time difference and phase difference between the color signals in each field are reduced, and the color shift is reduced. In this example,
Although the field sequential method has been described as an example, the present invention is not limited to this and can be similarly applied to the frame sequential method.
【００１１】[0011]
【発明の効果】以上説明した如く、本発明によれば、面
順次方式で撮像された動画像でも、色ずれの少ない画像
を得ることができる。As described above, according to the present invention, it is possible to obtain an image with little color misregistration even in a moving image picked up by a frame sequential method.
【図１】本発明の全体構成を示すブロック図FIG. 1 is a block diagram showing the overall configuration of the present invention.
【図２】本発明の動作を説明する信号波形図FIG. 2 is a signal waveform diagram for explaining the operation of the present invention.
【図３】従来方式の構成を示すブロック図FIG. 3 is a block diagram showing a configuration of a conventional system.
１３，２２ Ｒメモリ、１４，２３ Ｇメモリ、１５，
２４ Ｂメモリ、２５，２８，２９，３２，３３，３６
１／３減衰器、２６，２７，３０，３１，３４，３５
２／３減衰器、３７〜４２ 切換器、４３，４４，４
５ 加算器。13,22 R memory, 14,23 G memory, 15,
24 B memory, 25, 28, 29, 32, 33, 36
1/3 attenuator, 26, 27, 30, 31, 34, 35
2/3 attenuator, 37 to 42 switching device, 43, 44, 4
5 adder.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H04N 9/04 - 9/11 H04N 9/64 - 9/78 ─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. 7 , DB name) H04N 9/04-9/11 H04N 9/64-9/78
Claims (3)
別の画像を順次撮像し面順次の各色画像信号を得る手段
と、該面順次の各色画像信号を色別に記憶し同時に出力
する各色の第１の記憶手段と、該各色の第１の記憶手段
のそれぞれの出力を記憶する各色の第２の記憶手段と、
上記各色の第１の記憶手段の出力と上記各色の第２の記
憶手段の出力をそれぞれ面順次の周期で加算比率を変え
て加算しそれぞれ各色の画像信号を出力する各色の信号
処理手段とを有することを特徴とする電子内視鏡用色ず
れ低減装置。1. An electronic endoscope of a frame-sequential system, means for sequentially capturing images of respective colors to obtain image signals of respective frame-sequential colors, and storing each of the image signals of respective frame-sequential colors by color and simultaneously outputting the same. A first storage means for storing the respective outputs of the first storage means for the respective colors, and a second storage means for each color,
The output of the first storage means for each color and the output of the second storage means for each color are added at different addition ratios in a frame-sequential cycle, and signal processing means for each color that outputs an image signal of each color is provided. A color misregistration reduction device for an electronic endoscope, characterized by having.
憶手段の出力をＸ、上記各色の第２の記憶手段の出力を
Ｙ、上記各色の信号処理手段の出力をＺとした場合、上
記各色の信号処理手段における処理を、 Ｚ＝ｋＸ＋(１−ｋ)Ｙ 但し、加算比率ｋは、０＜ｋ
≦１ の範囲内で面順次の周期で、繰り返し切り替わる
となるごとく構成したことを特徴とする電子内視鏡用色
ずれ低減装置。2. When the output of the first storage means for each color is X, the output of the second storage means for each color is Y, and the output of the signal processing means for each color is Z, according to claim 1, Z = kX + (1−k) Y, where the addition ratio k is 0 <k
A color shift reducing apparatus for an electronic endoscope, characterized in that the color shift reducing apparatus is configured to be repeatedly switched in a frame-sequential cycle within a range of ≤1.
の信号処理手段を、上記各色の第１の記憶手段の出力信
号レベルをそれぞれ１／３および２／３に減衰する各色
の第１の減衰手段と、上記各色の第２の記憶手段の出力
信号レベルをそれぞれ２／３および１／３に減衰する各
色の第２の各色減衰手段と、面順次周期で、それぞれ上
記各色の第１の減衰手段の各信号出力および減衰しない
上記各色の第１の記憶手段の信号出力を順次切換え出力
する各色の第１の切換手段と、それぞれ上記各色の第２
の減衰手段の各信号出力および無信号出力を順次切換え
出力する各色の第２の切換手段と、上記各色の第１の切
換手段の出力と上記各色の第２の切換手段の出力をそれ
ぞれ加算する各色の加算手段により構成したことを特徴
とする電子内視鏡用色ずれ低減装置。3. The first attenuation of each color according to claim 1, wherein the signal processing means of each color attenuates the output signal level of the first storage means of each color to 1/3 and 2/3, respectively. Means and second attenuating means for attenuating the output signal level of the second storing means for the respective colors to 2/3 and 1/3, respectively, and a first attenuation for the respective colors at a frame sequential period. First switching means for sequentially switching and outputting the respective signal outputs of the means and the signal outputs of the first storage means for the respective colors that are not attenuated, and the second switching means for the respective colors.
The second switching means of each color for sequentially switching and outputting each signal output and non-signal output of the attenuating means, the output of the first switching means of each color and the output of the second switching means of each color are added. A color misregistration reduction device for an electronic endoscope, characterized in that it is composed of addition means for each color.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25775995A JP3514557B2 (en) | 1995-10-04 | 1995-10-04 | Color shift reduction device for electronic endoscopes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25775995A JP3514557B2 (en) | 1995-10-04 | 1995-10-04 | Color shift reduction device for electronic endoscopes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09102958A JPH09102958A (en) | 1997-04-15 |
| JP3514557B2 true JP3514557B2 (en) | 2004-03-31 |
Family
ID=17310709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25775995A Expired - Lifetime JP3514557B2 (en) | 1995-10-04 | 1995-10-04 | Color shift reduction device for electronic endoscopes |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3514557B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009165553A (en) | 2008-01-11 | 2009-07-30 | Olympus Medical Systems Corp | Medical image processing apparatus and medical imaging system |
-
1995
- 1995-10-04 JP JP25775995A patent/JP3514557B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09102958A (en) | 1997-04-15 |
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