JPH07105903B2 - Video signal sending / receiving system - Google Patents
Video signal sending / receiving systemInfo
- Publication number
- JPH07105903B2 JPH07105903B2 JP62064376A JP6437687A JPH07105903B2 JP H07105903 B2 JPH07105903 B2 JP H07105903B2 JP 62064376 A JP62064376 A JP 62064376A JP 6437687 A JP6437687 A JP 6437687A JP H07105903 B2 JPH07105903 B2 JP H07105903B2
- Authority
- JP
- Japan
- Prior art keywords
- correction
- signal
- video signal
- input
- receiver
- 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 - Fee Related
Links
Landscapes
- Picture Signal Circuits (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、映像信号送出／受像システム、特に、テレビ
（以下、TVという）信号送出機/TV信号受像機に関する
ものである。TECHNICAL FIELD The present invention relates to a video signal transmitting / receiving system, and more particularly to a television (hereinafter referred to as TV) signal transmitting / TV signal receiving device.
従来のこの種のTV信号受像機における画像表示手段は、
陰極線管（以下、CRTという）が一般的であったため、C
RTの入力信号電圧Ｅと受像管の発光出力Ｌとの関係Ｌ＝
kEを表わすガンマ値γが、γ＝2.2という値であり、主
として経済的理由から、送出側のTVカメラにおいてシス
テムのγ値が１（直線特性）となるよう、γ＝0.45の補
正処理を行って映像信号を送出していた。The image display means in the conventional TV signal receiver of this type is
Since a cathode ray tube (hereinafter referred to as CRT) was common, C
Relation between the input signal voltage E of RT and the light emission output L of the picture tube L =
The gamma value γ representing kE is a value of γ = 2.2, and mainly for economic reasons, a correction process of γ = 0.45 is performed so that the γ value of the system becomes 1 (linear characteristic) in the sending TV camera. Were sending video signals.
しかしながら、近年、市場に出現するようになってきた
液晶画像表示装置（以下、LCDという）においては、LCD
自体のγ値は１であるが、送出TVカメラ側の前記γ＝0.
45補正を逆補正するために、信号処理段階で、γ＝2.2
の補正を行っている。However, in the liquid crystal image display device (hereinafter, referred to as LCD) that has recently appeared on the market,
The γ value of itself is 1, but the γ = 0.
45 To reverse the correction, γ = 2.2 at the signal processing stage
Is being corrected.
しかしながら、上記のように、送出側の撮像部、受像側
の表示部ともに前記γ値が１であるにもかかわらず、双
方においてそれぞれγ補正と逆γ補正を行うことは無駄
であるのみならず、再生画像の階調表現力劣化の原因と
もなるという欠点があった。However, as described above, even though the γ value is 1 in both the image pickup unit on the sending side and the display unit on the image receiving side, it is not only wasteful to perform γ correction and inverse γ correction on both sides. However, there is a drawback that it also causes deterioration of the gradation expression of the reproduced image.
本発明は、以上のような従来技術の問題点にかんがみて
なされたもので、従来システムとの互換性を失うことな
く、本来不要な信号処理過程の通過を避けて前記階調表
現力劣化原因を除去し得る画像入／出力システムの提供
を目的としている。The present invention has been made in view of the above-mentioned problems of the prior art, and does not lose the compatibility with the conventional system, avoids the passage of an originally unnecessary signal processing process, and causes the deterioration of the gradation expression power. It is an object of the present invention to provide an image input / output system capable of removing the image.
このため、本発明においては、入力映像信号に対してγ
補正処理を行うための回路と、該補正後の信号を再生す
る表示手段と、前記γ補正処理回路を制御する信号を判
別する手段とを備えた受像機、および、γ補正状態を表
わす判別信号を前記入力信号に付加する手段を備えた画
素信号送出機とを組合せて構成することにより、前記目
的を達成しようとするものである。Therefore, in the present invention, γ is applied to the input video signal.
A receiver including a circuit for performing a correction process, a display unit for reproducing the signal after the correction, a unit for determining a signal for controlling the γ correction processing circuit, and a determination signal indicating a γ correction state It is intended to achieve the above object by combining with a pixel signal transmitter having a means for adding to the input signal.
以上のような構成により、例えば、LCD等、γ＝１の画
像表示装置を用いた場合、映像信号送出側ではγ補正を
行わず、γ補正なしの判別信号をTV信号に付加して送出
し、受像側において、上記γ補正なしの判別信号によ
り、逆γ補正を行うことなく前記表示装置に映像信号を
入力することが可能となり、かつ、従来システムとの互
換性を保持し得る。With the above configuration, for example, when an image display device with γ = 1 such as LCD is used, γ correction is not performed on the video signal sending side, and a determination signal without γ correction is added to the TV signal and sent. On the image receiving side, the discrimination signal without the γ correction allows the video signal to be input to the display device without performing the inverse γ correction, and the compatibility with the conventional system can be maintained.
以下に、本発明を実施例に基づいて説明する。第１図
に、本発明に係る映像信号送出／受像システムの一実施
例の構成ブロック図である。Hereinafter, the present invention will be described based on Examples. FIG. 1 is a configuration block diagram of an embodiment of a video signal sending / receiving system according to the present invention.
（構成） 第１図において、10は映像信号送出機であるTVカメラ、
11は、受像機である映像モニタである。１は、被写体を
結像させるための撮影レンズ、２は、γ＝１の撮像素
子、３は制御増幅器で、この増幅器３は、γ補正回路を
含んでいるが、この図例の場合は、“補正なし”（γ＝
１）の状態である。４はエンコーダ、５は、“γ補正な
し”の判別信号発生器であり、この判別信号は、NTSCあ
るいはPAL等の各TV方式にて自由に使用できる場所、例
えば垂直ブランキング内に配設する。これにより、γ補
正なしのTV信号に、“補正なし”判別信号が出力され
る。(Structure) In FIG. 1, 10 is a TV camera which is a video signal transmitter,
Reference numeral 11 is a video monitor which is a receiver. Reference numeral 1 is a photographing lens for forming an image of a subject, 2 is an image pickup device with γ = 1, 3 is a control amplifier, and this amplifier 3 includes a γ correction circuit. In the case of this example, “No correction” (γ =
This is the state of 1). Reference numeral 4 is an encoder, and 5 is a discrimination signal generator of "no γ correction". This discrimination signal is arranged in a place that can be freely used in each TV system such as NTSC or PAL, for example, in a vertical blanking. . As a result, the “no correction” determination signal is output to the TV signal without γ correction.
一方、受像機側の映像モニタ11において、６はγ補正判
別器、７は逆γ補正回路、９は映像信号切換スイッチ、
9a、9bは各切換接点、８は、γ＝１の映像表示装置であ
るLCDを示す。On the other hand, in the video monitor 11 on the receiver side, 6 is a γ correction discriminator, 7 is an inverse γ correction circuit, 9 is a video signal changeover switch,
9a and 9b are switching contacts, and 8 is an LCD which is an image display device with γ = 1.
（動作） 以上のようなシステム構造において、TVカメラ10からの
映像信号が受像機11に入力されると、γ補正判別器６に
より、“γ補正なし”と判別して、切換スッチ９を接点
9b側へと切換え、逆γ補正回路７を通過しない信号を、
LCD8へと送出する。(Operation) In the system structure as described above, when the video signal from the TV camera 10 is input to the receiver 11, the γ correction discriminator 6 discriminates “no γ correction” and makes the switching switch 9 contact.
The signal that does not pass through the inverse γ correction circuit 7 is switched to the 9b side,
Send to LCD8.
つぎに、第２図は、映像信号送出機として、従来形のTV
カメラシステム10aを、前記第１図における受像機11へ
互換性可能に接続／使用し得る事例を説明する図であ
る。図中、1,2,4は、それぞれ第１図におけると同一
（相当）構成要素を示す。12は制御増幅器で、γ＝0.45
である。この出力を受像機11へ入力させる場合、γ補正
判別器６は、“γ補正あり”と判別して、切換スイッチ
９の接点を9a側に切換えることにより、逆γ補正回路７
を通過した信号を、LCD8に入力させるよう動作する。Next, FIG. 2 shows a conventional TV as a video signal transmitter.
FIG. 2 is a diagram illustrating an example in which the camera system 10a can be interchangeably connected / used to the image receiver 11 in FIG. In the figure, 1, 2, and 4 respectively indicate the same (corresponding) constituent elements as in FIG. 12 is a control amplifier, γ = 0.45
Is. When inputting this output to the receiver 11, the γ correction discriminator 6 determines that “γ correction is present”, and switches the contact of the changeover switch 9 to the 9a side, whereby the inverse γ correction circuit 7
It operates so as to input the signal passed through to LCD8.
以上の動作シーケンスフローチャートを第３図に示す。
図により自明のため、各ステップ毎の逐次説明は省略す
る。The above operation sequence flowchart is shown in FIG.
Since the figure is self-explanatory, the sequential description of each step is omitted.
また、第４図は、本発明システムにおいて、CRT14を用
いた場合の受像機15の構成ブロック図である。図中、6,
9は、それぞれ第１図の受像機11におけると同一（相
当）構成要素を示す。13はγ＝0.45のγ補正回路であ
る。“γ補正なし”の信号が入力した場合は、γ補正判
別器６により、切換スイッチ９は、接点9b側に切換えら
れて、γ＝0.45の補正が行われ、CRT14に入力される。
また、“γ補正あり”の入力信号の場合は、γ補正判別
器６により、切換スイッチ９は、接点9a側に切換えられ
て、γ補正を行わずにCRT14に入力されるよう動作す
る。FIG. 4 is a block diagram showing the configuration of the receiver 15 when the CRT 14 is used in the system of the present invention. In the figure, 6,
Reference numerals 9 respectively indicate the same (corresponding) constituent elements as those in the receiver 11 of FIG. Reference numeral 13 is a γ correction circuit with γ = 0.45. When the signal of "no γ correction" is input, the γ correction discriminator 6 switches the changeover switch 9 to the contact 9b side, and γ = 0.45 is corrected and is input to the CRT 14.
Further, in the case of an input signal of “with γ correction”, the γ correction discriminator 6 switches the changeover switch 9 to the contact 9a side and operates so as to be input to the CRT 14 without γ correction.
第５図は、以上の動作シーケンスフローチャートであ
り、第３図におけると同一理由により、各ステップ毎の
逐次説明は省略する。FIG. 5 is a flowchart of the above operation sequence, and for the same reason as in FIG. 3, the sequential description of each step is omitted.
以上、説明したように、本発明によれば、入力映像信号
にγ補正判別信号を付加するようにしたため、従来の映
像信号送出システムとの互換性を失うことなく、最良の
信号伝達経路が得られるこの種のシステムを構成するこ
とができた。As described above, according to the present invention, since the γ correction determination signal is added to the input video signal, the best signal transmission path can be obtained without losing the compatibility with the conventional video signal transmission system. It was possible to configure this type of system to be used.
第１図は、本発明によるシステムの一実施例の構成ブロ
ック図、第２図は、従来のTVカメラシステムへの換装例
図、第３図は、第1/2図における動作シーケンスフロー
チャート、第４図は、本発明システムにおけるCRT受像
機側の一例の構成ブロック図、第５図は、その動作シー
ケンスフローチャートである。 ３……制御増幅器 ５……γ補正なし判別信号発生器 ６……γ補正判別器 ７……逆γ補正回路 ８……LCD ９……切換スイッチ 10,10a……映像信号送出機 11,15……受像機 14……CRTFIG. 1 is a configuration block diagram of an embodiment of a system according to the present invention, FIG. 2 is a diagram showing an example of conversion to a conventional TV camera system, FIG. 3 is an operation sequence flowchart in FIG. FIG. 4 is a configuration block diagram of an example of the CRT receiver side in the system of the present invention, and FIG. 5 is an operation sequence flowchart thereof. 3 ... Control amplifier 5 ... Discrimination signal generator without gamma correction 6 ... Gamma discrimination discriminator 7 ... Reverse gamma correction circuit 8 ... LCD 9 ... Changeover switch 10, 10a ... Video signal transmitter 11, 15 …… Receiver 14 …… CRT
Claims (1)
路と、該補正後の信号を再生する表示手段と、前記γ補
正処理回路を制御する信号を判別する手段とを備えた受
像機、および前記γ補正状態を表わす判別信号を前記入
力映像信号に付加する手段を備えた映像信号送出機とよ
り成ることを特徴とする映像信号送出／受像システム。1. A receiver including a circuit for performing γ correction processing on an input video signal, a display unit for reproducing the corrected signal, and a unit for discriminating a signal for controlling the γ correction processing circuit. , And a video signal transmitter having means for adding a discrimination signal indicating the γ correction state to the input video signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62064376A JPH07105903B2 (en) | 1987-03-20 | 1987-03-20 | Video signal sending / receiving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62064376A JPH07105903B2 (en) | 1987-03-20 | 1987-03-20 | Video signal sending / receiving system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63232682A JPS63232682A (en) | 1988-09-28 |
| JPH07105903B2 true JPH07105903B2 (en) | 1995-11-13 |
Family
ID=13256521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62064376A Expired - Fee Related JPH07105903B2 (en) | 1987-03-20 | 1987-03-20 | Video signal sending / receiving system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07105903B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01196978A (en) * | 1988-01-30 | 1989-08-08 | Fuji Photo Film Co Ltd | Video camera for document photographing |
| JP3208324B2 (en) * | 1996-05-31 | 2001-09-10 | 三洋電機株式会社 | Digital still camera |
-
1987
- 1987-03-20 JP JP62064376A patent/JPH07105903B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63232682A (en) | 1988-09-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |