JPH0435388A - Picture transmitter - Google Patents
Picture transmitterInfo
- Publication number
- JPH0435388A JPH0435388A JP2138026A JP13802690A JPH0435388A JP H0435388 A JPH0435388 A JP H0435388A JP 2138026 A JP2138026 A JP 2138026A JP 13802690 A JP13802690 A JP 13802690A JP H0435388 A JPH0435388 A JP H0435388A
- Authority
- JP
- Japan
- Prior art keywords
- signals
- synchronizing signal
- signal
- pseudo
- image
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003321 amplification Effects 0.000 claims abstract description 13
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 13
- 230000005540 biological transmission Effects 0.000 claims description 13
- 230000006866 deterioration Effects 0.000 abstract description 4
- 239000000203 mixture Substances 0.000 abstract 1
- 230000003287 optical effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 4
- 239000013307 optical fiber Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
Landscapes
- Details Of Television Systems (AREA)
- Color Television Systems (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、画像を伝送する装置に関するものである。[Detailed description of the invention] [Industrial application field] The present invention relates to a device for transmitting images.
従来のこの種の装置は、画像信号Ｒ，Ｇ、Ｂをそのまま
の形で送信側から受信側へ伝送し、伝送系で減衰した量
を、受信側にて一括（Ｒ，Ｇ、Ｂ信号）に同じゲインで
増幅し、再生していた。Conventional devices of this type transmit image signals R, G, and B as they are from the transmitting side to the receiving side, and the amount attenuated in the transmission system is collectively transmitted (R, G, B signals) on the receiving side. was amplified and played back with the same gain.
上記の如き従来の技術においては、各信号系の伝送路に
よる減衰差、送受信部分の各信号に対する増幅効率差な
どによって、各画像信号の振幅が送信時と比ベバランス
（Ｒ，Ｇ、Ｂ振幅値比）がくずれてしまっていた。In the conventional technology as described above, the amplitude of each image signal is balanced (R, G, B amplitude value ratio) had collapsed.
このバランスが崩れるために、色の再現性が悪化する問
題点があった。そこで本発明は、このような伝送系によ
る色再現の低下を防止することを目的とする。Since this balance is disrupted, there is a problem in that color reproducibility deteriorates. Therefore, it is an object of the present invention to prevent the deterioration of color reproduction caused by such a transmission system.
上記問題点の解決のために、本発明では、送信側として
カメラコントロールユニット内で、ＲｌＣ，Ｂの各信号
に水平同期信号と同期した擬似同期信号を混合させる、
（混合させる擬像信号は、各信号とも同じタイミング、
同じ振幅）受信側は、この擬似同期信号の電圧が、送信
した時と同じ電圧になるようにそれぞれの画像混合信号
（各画像信号士擬似同期信号）の増幅率を自動調整する
。In order to solve the above problems, in the present invention, a pseudo synchronization signal synchronized with a horizontal synchronization signal is mixed with each of the RlC and B signals in the camera control unit on the transmitting side.
(The pseudo image signals to be mixed have the same timing for each signal,
(same amplitude) The receiving side automatically adjusts the amplification factor of each image mixed signal (pseudo sync signal for each image signal) so that the voltage of this pseudo sync signal becomes the same voltage as when it was transmitted.
本発明では、伝送による減衰量に合わせた再生が各画像
信号（Ｒ，Ｇ、Ｂ）で精度良く出来るため、受信側での
色再現の低下を防ぐことができる。In the present invention, each image signal (R, G, B) can be reproduced with high precision in accordance with the amount of attenuation due to transmission, so that deterioration in color reproduction on the receiving side can be prevented.
又、増幅率を擬似同期信号ごとに検出しているため、使
用時に伝送系の減衰量の変化が発生しても、すぐに適正
な増幅率になるため、常に安定した色、明るさの画像を
得ることができる。In addition, since the amplification factor is detected for each pseudo synchronous signal, even if there is a change in the attenuation of the transmission system during use, the amplification factor will be immediately adjusted to the appropriate one, resulting in images with always stable color and brightness. can be obtained.
第１図は、本発明の実施例であって、高精細用ＴＶカメ
ラ１、カメラコントールユニット（ＣＣＵ）２の間は、
画像信号Ｒ，Ｇ、Ｂにそれぞれ対応した３本の同軸ケー
ブルで接続され、ＣＣ２と伝送部（送信部）３との間は
画像混合信号Ｒ。FIG. 1 shows an embodiment of the present invention, in which a high-definition TV camera 1 and a camera control unit (CCU) 2 are connected to each other.
It is connected by three coaxial cables corresponding to the image signals R, G, and B, respectively, and the image mixed signal R is connected between the CC2 and the transmission section (transmission section) 3.
Ｇ’ 、Ｂ“にそれぞれ対応したケーブルと水平、垂直
同期信号ＨＤ、ＶＤそれぞれ対応した計５本の同軸ケー
ブルにて接続されている。送信部３と伝送部（受信部）
４との間は、光信号に変換された画像混合信号Ｒ’ 、
Ｇ’ 、Ｂ’ と光信号に変換された水平、垂直同期信
号ＨＤ、ＶＤとにそれぞれ対応した計５本の光ファイバ
ーにて接続されている。また、受信部４とＴＶモニタ５
との間は、画像信号Ｒ，Ｇ、Ｂと垂直同期信号ＨＤ、Ｖ
Ｄの計５本の同軸ケーブルにて接続されている。It is connected by a total of five coaxial cables that correspond to G' and B'' and horizontal and vertical synchronization signals HD and VD respectively. Transmitter 3 and transmitter (receiver)
4 is an image mixed signal R' converted into an optical signal,
A total of five optical fibers are connected to G', B' and horizontal and vertical synchronizing signals HD and VD converted into optical signals, respectively. In addition, the receiving section 4 and the TV monitor 5
The image signals R, G, B and vertical synchronization signals HD, V
Connected by a total of 5 coaxial cables.
ＴＶカメラ１からの画像信号（Ｒ，Ｇ、Ｂ）（第２図に
は、Ｒ，Ｇ、Ｂの一つを示した）の各々と、ＣＣＵＺ内
の擬似同期信号作成回路２１にて同期信号作成回路２２
からの水平同期信号（ＨＤ）を基に作成した一定しベル
ＶＴの擬似同期信号（第３図）とをＣＣＵＺ内の混合回
路（各信号Ｒ，Ｇ、Ｂに対応して計３つの混合部を有す
る）２３にて合成し１、各画像信号Ｒ，Ｇ、Ｂ毎に計３
つの画像混合信号Ｒ’ 、Ｇ’ 、Ｂ“毎に計３つの画
像混合信号Ｒ’ 、Ｇ’ 、Ｂ’を作る。Each of the image signals (R, G, B) from the TV camera 1 (one of R, G, B is shown in Fig. 2) and a synchronization signal are generated by the pseudo synchronization signal generation circuit 21 in the CCUZ. Creation circuit 22
A constant-bell VT pseudo synchronization signal (Fig. 3) created based on the horizontal synchronization signal (HD) from ) 23 to synthesize 1, total of 3 for each image signal R, G, B
A total of three image mixed signals R', G', B' are generated for each image mixed signal R', G', B''.
この信号と同期信号作成回路２２の同期信号ＨＤ、ＶＤ
とを送信部３つの電気／光変換部３１にて電気信号Ｒ’
、Ｇ’ 、Ｂ’ 、ＨＤ、ＶＤから、光信号（Ｒ’
、Ｇ’ 、Ｂ’ 、ＨＤ、ＶＤ）に変換する。This signal and the synchronization signals HD and VD of the synchronization signal generation circuit 22
The three electrical/optical converters 31 transmit electrical signals R'
, G', B', HD, VD, the optical signal (R'
, G', B', HD, VD).
送信部３からの光信号は光ファイバを経て、受信部４の
光／電気変換部４１にて、光信号Ｒ′Ｇ’ 、Ｂ’ 、
ＨＤ、ＶＤから電気信号Ｒ’ 、Ｇ’Ｂ’ 、ＨＤ、Ｖ
Ｄに変換される。The optical signal from the transmitter 3 passes through an optical fiber and is converted into optical signals R'G', B',
Electrical signals R', G'B', HD, V from HD and VD
It is converted to D.
電気信号に変換された各信号（Ｒ’ 、Ｇ’ 、Ｂ’画
像信号）は各Ｒ’ 、Ｇ’ 、Ｂ’専用の可変増幅回路
４２（各信号Ｒ’ 、Ｇ’ 、Ｂ’に対応して計３つの
増幅回路部がある）に入る。各増幅回路部は、各信号Ｒ
’ 、Ｇ’ 、Ｂ”をそれぞれの擬似同期信号のレベル
が一定しベルＶＴになるようにそれぞれ増幅することで
ＴＶカメラから出力された時と同じ振幅に増幅し、その
出力値と同期信号ＨＤ、ＶＤとをＴＶモニタ５に伝送し
、ＴＶカメラ１でとらえた画像をＴＶモニタ５に表示す
る。可変増幅回路４２の増幅率を決めるのは、増幅回路
の出力値を前祝している増幅率換算回路４３にて行なっ
ており、ＣＣＵ２の出力波形（第４図）の擬似同期信号
振幅■１と可変増幅回路の出力波形（第５図）の擬似同
期信号振幅ｖｌの差から可変増幅回路の増幅率を可変し
、■アー■１になるまで、可変を繰り返すことにより、
ＣＣＵ２から出力された時の画像信号と同じ振幅に増幅
している。Each signal (R', G', B' image signal) converted into an electric signal is transferred to a variable amplifier circuit 42 (corresponding to each signal R', G', B') dedicated to each R', G', B'. There are a total of three amplifier circuit sections). Each amplifier circuit section has a signal R
', G', and B'' are each amplified so that the level of each pseudo synchronization signal is constant and becomes a bell VT, and the output value and the synchronization signal HD are amplified to the same amplitude as when output from the TV camera. , VD and are transmitted to the TV monitor 5, and the images captured by the TV camera 1 are displayed on the TV monitor 5.The amplification factor of the variable amplification circuit 42 is determined by the amplification factor that determines the output value of the amplification circuit. This is done by the rate conversion circuit 43, and the variable amplifier circuit is calculated from the difference between the pseudo synchronization signal amplitude 1 of the output waveform of the CCU 2 (Fig. 4) and the pseudo synchronization signal amplitude vl of the output waveform of the variable amplifier circuit (Fig. 5). By varying the amplification factor of and repeating the variation until it becomes 1,
It is amplified to the same amplitude as the image signal output from the CCU 2.
伝送距離がそれほど長くなかったり、画像信号の周波数
帯域がそれほど広くないときには、光ファイバを使用し
ないで、同軸ケーブルでの伝送においても、適応する。When the transmission distance is not so long or the frequency band of the image signal is not so wide, it is also possible to use coaxial cable for transmission without using optical fiber.
この場合には、第１図の伝送部３．４のユニットは必要
がなく、ＣＣＵ２からの各ＲＧＢ信号を、同軸ケーブル
を経て直接可変増幅回路４２に取付けることで、安定し
た画像を得ることができる。In this case, the transmission unit 3.4 shown in Fig. 1 is not necessary, and a stable image can be obtained by directly connecting each RGB signal from the CCU 2 to the variable amplifier circuit 42 via a coaxial cable. can.
上記実施例では、高精細ＴＶカメラを使用したが、もっ
と周波数帯域が広いＴＶカメラの場合もっと、伝送によ
る損失が起きやすいので、このような伝送が有効になる
。Although a high-definition TV camera is used in the above embodiment, such a transmission is more effective in the case of a TV camera with a wider frequency band because transmission losses are more likely to occur.
なお、第２図から第５図において、１．は水平ブランキ
ング時間、１．は水平同期時間、■、はＣＣＵ２出力時
の擬似同期信号振幅電圧、■、は可変増幅回路４２の出
力時の擬似同期信号振幅電圧、■、は画像信号振幅電圧
、■、は全振幅電圧、である。In addition, in FIGS. 2 to 5, 1. is the horizontal blanking time, 1. is the horizontal synchronization time, ■ is the pseudo synchronization signal amplitude voltage at the output of the CCU 2, ■ is the pseudo synchronization signal amplitude voltage at the output of the variable amplifier circuit 42, ■ is the image signal amplitude voltage, ■ is the total amplitude voltage, It is.
以上の様に本発明によれば、画像伝送することによる色
再現の低下を防ぐことが可能になる。又、距離の離れた
場所まで、色再現の低下なく伝送することが可能になる
ので、たとえばＴＶカメラ側をクリーンルーム内、又は
、無菌室に置き、その外側にて色再現のいい画像を得る
ことが可能になる。As described above, according to the present invention, it is possible to prevent deterioration in color reproduction due to image transmission. In addition, it is possible to transmit images to distant locations without degrading color reproduction, so for example, the TV camera side can be placed in a clean room or a sterile room and images with good color reproduction can be obtained outside of the clean room. becomes possible.
第１図は、本発明による実施例のブロック図、第２図は
ＴＶカメラから出力した画像信号波形図、第３図はＣＣ
Ｕ内で作成した擬似同期信号の波形図、第４図はＣＣＵ
内混合回路にて合成された画像混合信号波形図、第５図
は可変増幅回路から出力された画像混合信号波形図、で
ある。
〔主要部分の符号の説明〕
２・・−・・・カメラコントロールユニット（ＣＣＵ）
、２１・・・・・・擬似同期信号作成回路、２２・・・
・・・同期信号作成回路、
２３・・・・・・混合回路、
４２・・・・・・可変増幅回路、
４３・・・・・・増幅率換算回路。Fig. 1 is a block diagram of an embodiment according to the present invention, Fig. 2 is an image signal waveform diagram output from a TV camera, and Fig. 3 is a CC
Waveform diagram of pseudo synchronization signal created in U, Figure 4 is CCU
FIG. 5 is a waveform diagram of the image mixed signal synthesized by the internal mixing circuit, and FIG. 5 is a waveform diagram of the image mixed signal output from the variable amplification circuit. [Explanation of symbols of main parts] 2...Camera control unit (CCU)
, 21...Pseudo synchronization signal generation circuit, 22...
... Synchronization signal generation circuit, 23 ... Mixing circuit, 42 ... Variable amplification circuit, 43 ... Amplification factor conversion circuit.
Claims (1)
似同期信号を混合する混合回路を設けると共に受信側に
それぞれの画像信号Ｒ、Ｇ、Ｂの擬似同期信号の振幅が
所定値になるように画像信号Ｒ、Ｇ、Ｂを増幅回路を設
けたことを特徴とする画像伝送装置。A mixing circuit is provided on the transmitting side to mix a pseudo synchronizing signal of a predetermined amplitude with each of the image signals R, G, and B, and on the receiving side, the amplitude of the pseudo synchronizing signal of each of the image signals R, G, and B becomes a predetermined value. An image transmission device characterized in that an amplification circuit is provided for image signals R, G, and B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2138026A JPH0435388A (en) | 1990-05-28 | 1990-05-28 | Picture transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2138026A JPH0435388A (en) | 1990-05-28 | 1990-05-28 | Picture transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0435388A true JPH0435388A (en) | 1992-02-06 |
Family
ID=15212318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2138026A Pending JPH0435388A (en) | 1990-05-28 | 1990-05-28 | Picture transmitter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0435388A (en) |
-
1990
- 1990-05-28 JP JP2138026A patent/JPH0435388A/en active Pending
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