JPH0445330Y2 - - Google Patents
Info
- Publication number
- JPH0445330Y2 JPH0445330Y2 JP14298685U JP14298685U JPH0445330Y2 JP H0445330 Y2 JPH0445330 Y2 JP H0445330Y2 JP 14298685 U JP14298685 U JP 14298685U JP 14298685 U JP14298685 U JP 14298685U JP H0445330 Y2 JPH0445330 Y2 JP H0445330Y2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- aperture
- correction
- aperture correction
- 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
Links
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 4
- 230000006866 deterioration Effects 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 208000019300 CLIPPERS Diseases 0.000 description 1
- 208000021930 chronic lymphocytic inflammation with pontine perivascular enhancement responsive to steroids Diseases 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
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- Picture Signal Circuits (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は、いわゆるビデオカメラに使用して好
適なアパーチヤ補正回路に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an aperture correction circuit suitable for use in a so-called video camera.
本考案はビデオカメラ等に使用されるアパーチ
ヤ補正回路に関し、AGC回路の前段の信号から
補正信号を作成することにより、被写体照度に応
じたアパーチヤ補正が行われ、常に良好な画質が
得られるようにするものである。
This invention relates to aperture correction circuits used in video cameras, etc. By creating a correction signal from the signal at the front stage of the AGC circuit, aperture correction is performed according to the illuminance of the subject, so that good image quality can always be obtained. It is something to do.
従来のビデオカメラにおいては、例えば第２図
に示すようなアパーチヤ補正が行われていた。図
においてイメージセンサ２１からの信号がAGC
回路２２を通じてγ補正等の信号処理回路２３に
供給され、処理された信号がアパーチヤ補正回路
２４に供給される。そしてアパーチヤ補正された
信号がバツフアアンプ２５を通じて出力端子２６
に出力される。
In conventional video cameras, aperture correction as shown in FIG. 2, for example, has been performed. In the figure, the signal from the image sensor 21 is AGC
The signal is supplied through a circuit 22 to a signal processing circuit 23 for γ correction, etc., and the processed signal is supplied to an aperture correction circuit 24. Then, the aperture-corrected signal passes through the buffer amplifier 25 to the output terminal 26.
is output to.
ところが上述の装置の場合、被写体の照度に関
係なく輪郭補正量（アパーチヤレベル）が定めら
れており、このため低照度時においてはノイズを
強調してしまいＳ／Ｎを劣化させ、また明るい被
写体を撮像した場合にも低照度時のＳ／Ｎを考慮
するために十分にアパーチヤレベルを高めること
ができなかつた。 However, in the case of the above-mentioned device, the amount of contour correction (aperture level) is determined regardless of the illuminance of the subject, which emphasizes noise and degrades S/N in low illumination, and also when shooting bright subjects. Even in the case of imaging, it was not possible to raise the aperture level sufficiently in order to take into account the S/N ratio at low illuminance.
これに対して映像信号のレベルを検出し、これ
に応じてアパーチヤレベルを補正することが提案
された（実公昭51−18651号公報参照）。しかしな
がらこの装置では、アパーチヤレベルを調整でき
る特殊な補正回路を必要とし、回路構成が複雑に
なる。また上述の文献の例ではAGC回路の制御
電圧を流用してアパーチヤレベルの補正を行うよ
うにしているが、一般にAGCは低レベル時のみ
働くようにされており、明るい被写体での補正に
は利用できないと共に、制御の応答性もAGCと
同じでは遅すぎる。 In response to this problem, it has been proposed to detect the level of the video signal and correct the aperture level accordingly (see Japanese Utility Model Publication No. 18651/1983). However, this device requires a special correction circuit that can adjust the aperture level, making the circuit configuration complicated. Furthermore, in the example of the above-mentioned literature, the control voltage of the AGC circuit is used to correct the aperture level, but AGC is generally designed to work only at low levels, and is not suitable for correction for bright subjects. In addition to being unusable, the control response is also too slow to match that of AGC.
このように従来の技術では、アパーチヤレベル
を被写体照度に合せて補正することができず、あ
るいは補正のために複雑な回路構成を必要とする
などの問題点があつた。
As described above, the conventional techniques have problems such as not being able to correct the aperture level in accordance with the illuminance of the subject, or requiring a complicated circuit configuration for correction.
本考案は、イメージセンサ１の出力をAGC回
路２を介して導出すると共に、
上記AGC回路の前段の信号をアパーチヤ補正
信号の作成回路７に供給し、
この作成回路で作成されたアパーチヤ補正信号
を上記AGC回路の出力に加算（回路４）するよ
うにしたことを特徴とするアパーチヤ補正回路で
ある。
In the present invention, the output of the image sensor 1 is derived via the AGC circuit 2, and the signal from the previous stage of the AGC circuit is supplied to the aperture correction signal generation circuit 7, and the aperture correction signal generated by this generation circuit is generated. This aperture correction circuit is characterized in that it adds (circuit 4) to the output of the AGC circuit.
これによれば、AGC回路の前段の信号からア
パーチヤ補正信号を作成するようにしたので、簡
単な構成で被写体照度に応じてリニアに変化する
アパーチヤ補正信号が作成され、低照度時のＳ／
Ｎ劣化、明るい被写体撮像時の鮮鋭度劣化のな
い、良好なアパーチヤ補正を行うことができる。
According to this, since the aperture correction signal is created from the signal at the front stage of the AGC circuit, an aperture correction signal that changes linearly according to the subject illuminance can be created with a simple configuration, and the S/
Good aperture correction can be performed without N deterioration or sharpness deterioration when imaging a bright subject.
第１図において、イメージセンサ１からの信号
がAGC回路２を通じて信号処理回路３に供給さ
れ、処理された信号が加算回路４、バツフアアン
プ５を通じて出力端子６に出力される。
In FIG. 1, a signal from an image sensor 1 is supplied to a signal processing circuit 3 through an AGC circuit 2, and the processed signal is outputted to an output terminal 6 through an adder circuit 4 and a buffer amplifier 5.
それと共に、イメージセンサ１からの信号がア
パーチヤ補正信号の作成回路７に供給される。こ
の作成回路７は、例えば図中に示すように、入力
信号がローパスフイルタ１１に供給され、この
波信号が遅延回路１２を通じて加算回路１３に供
給されると共に、フイルタ１１からの信号と遅延
回路１２の反射信号との合成信号が反転アンプ１
４で位相反転されて加算回路１３に供給される。
これによつて加算回路１３から入力信号の２次微
分信号に近似した信号が出力され、この信号が微
少部分を除去するノイズクリツパー１５を通じ、
さらに所定の補正量を得るゲインコントロールア
ンプ１６を介してアパーチヤ補正信号が作成され
る。そしてこの補正信号が加算回路４に供給され
る。 At the same time, the signal from the image sensor 1 is supplied to the aperture correction signal generation circuit 7. For example, as shown in the figure, in this generation circuit 7, an input signal is supplied to a low-pass filter 11, this wave signal is supplied to an adder circuit 13 through a delay circuit 12, and a signal from the filter 11 and a delay circuit 12 are supplied. The composite signal with the reflected signal of is the inverting amplifier 1.
4, the phase is inverted and the signal is supplied to the adder circuit 13.
As a result, the adder circuit 13 outputs a signal that approximates the second-order differential signal of the input signal, and this signal passes through the noise clipper 15 that removes minute portions.
Furthermore, an aperture correction signal is created via a gain control amplifier 16 that obtains a predetermined correction amount. This correction signal is then supplied to the adder circuit 4.
こうしてアパーチヤ補正信号が作成され、信号
処理回路３からの輝度信号に加算されてアパーチ
ヤ補正が行われるわけであるが、上述の装置によ
れば、AGC回路の前段の信号からアパーチヤ補
正信号を作成するので、被写体の照度に応じてア
パーチヤレベルが変化され、低照度のとき補正量
が減少され、明るい被写体の撮像時に補正量が増
強されて、低照度時のＳ／Ｎを改善し、明るい被
写体の撮像時の鮮鋭度を改善した良好なアパーチ
ヤ補正を行い、自然な画質を得ることができる。 In this way, an aperture correction signal is created and added to the luminance signal from the signal processing circuit 3 to perform aperture correction. According to the above-mentioned device, the aperture correction signal is created from the signal at the previous stage of the AGC circuit. Therefore, the aperture level is changed according to the illuminance of the subject, and the amount of correction is decreased when the illuminance is low, and the amount of correction is increased when capturing a bright subject. It is possible to perform good aperture correction that improves the sharpness during image capture, and to obtain natural image quality.
またアパーチヤレベルを照度に合せて制御する
ような複雑な回路構成も必要としない。 Further, there is no need for a complicated circuit configuration for controlling the aperture level in accordance with the illuminance.
なおアパーチヤ補正信号の作成回路７は他の構
成のものを用いてもよい。 Note that the aperture correction signal generation circuit 7 may have another configuration.
本考案によれば、AGC回路の前段の信号から
アパーチヤ補正信号を作成するようにしたので、
簡単な構成で被写体照度に応じてリニアに変化す
るアパーチヤ補正信号が作成され、低照度時の
Ｓ／Ｎ劣化、明るい被写体撮像時の鮮鋭度劣化の
ない、自然なアパーチヤ補正を行うことができる
ようになつた。
According to the present invention, since the aperture correction signal is created from the signal at the front stage of the AGC circuit,
With a simple configuration, an aperture correction signal that changes linearly according to the subject illuminance is created, making it possible to perform natural aperture correction without S/N deterioration during low illuminance or sharpness deterioration when capturing bright objects. It became.
第１図は本考案の一例の構成図、第２図は従来
の技術の説明のための図である。
１はイメージセンサ、２はAGC回路、４は加
算回路、６は出力端子、７はアパーチヤ補正信号
の作成回路である。
FIG. 1 is a block diagram of an example of the present invention, and FIG. 2 is a diagram for explaining a conventional technique. 1 is an image sensor, 2 is an AGC circuit, 4 is an adder circuit, 6 is an output terminal, and 7 is an aperture correction signal generating circuit.
Claims (1)
出すると共に、 上記AGC回路の前段の信号をアパーチヤ補正
信号の作成回路に供給し、 この作成回路で作成されたアパーチヤ補正信号
を上記AGC回路の出力に加算するようにしたこ
とを特徴とするアパーチヤ補正回路。[Claims for Utility Model Registration] Deriving the output of the image sensor via an AGC circuit, and supplying a signal from the previous stage of the AGC circuit to an aperture correction signal generation circuit, and an aperture correction signal generated by this generation circuit. An aperture correction circuit characterized in that the above AGC circuit is added to the output of the AGC circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14298685U JPH0445330Y2 (en) | 1985-09-19 | 1985-09-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14298685U JPH0445330Y2 (en) | 1985-09-19 | 1985-09-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6251867U JPS6251867U (en) | 1987-03-31 |
| JPH0445330Y2 true JPH0445330Y2 (en) | 1992-10-26 |
Family
ID=31052242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14298685U Expired JPH0445330Y2 (en) | 1985-09-19 | 1985-09-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0445330Y2 (en) |
-
1985
- 1985-09-19 JP JP14298685U patent/JPH0445330Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6251867U (en) | 1987-03-31 |
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