JPH0396078A - Contour correction circuit - Google Patents
Contour correction circuitInfo
- Publication number
- JPH0396078A JPH0396078A JP1231620A JP23162089A JPH0396078A JP H0396078 A JPH0396078 A JP H0396078A JP 1231620 A JP1231620 A JP 1231620A JP 23162089 A JP23162089 A JP 23162089A JP H0396078 A JPH0396078 A JP H0396078A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- video signal
- voltage
- contour
- noise
- 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
- 238000000926 separation method Methods 0.000 claims abstract description 11
- 238000000605 extraction Methods 0.000 claims abstract description 7
- 239000000284 extract Substances 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 5
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
Landscapes
- Picture Signal Circuits (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、テレビ受信機において，映像の輪郭を強調し
て出力する輪郭補正回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a contour correction circuit for emphasizing and outputting the contours of an image in a television receiver.
従来のかかる輪郭補正回路は、特開昭６３−１５５８７
１号公報に記載の様に、外部調整ツマミを設けておき、
このツマミによって強調量を手動にて補正していた．
〔発明が解決しようとする課題〕
上記従来技術は、そのノイズ成分などが異なる映像信号
を受信する毎に、適切な映像が得られる様に外部調整ツ
マミで手動で補正量を変えなければならず、操作上わず
らわしさがあった。Such a conventional contour correction circuit is disclosed in Japanese Patent Application Laid-Open No. 63-15587.
As described in Publication No. 1, an external adjustment knob is provided,
The amount of emphasis was manually corrected using this knob. [Problems to be Solved by the Invention] In the above conventional technology, each time a video signal with a different noise component is received, the amount of correction must be manually changed using an external adjustment knob so that an appropriate video can be obtained. , it was cumbersome to operate.
本発明の目的は、入力信号のノイズ状態を検知し、これ
により自動的に輪郭補正量の制御を行なうことができ、
操作上のわずらわしさを解決した輪郭補正回路を提供す
ることにある。An object of the present invention is to detect the noise state of an input signal and thereby automatically control the amount of contour correction.
An object of the present invention is to provide a contour correction circuit that solves the troublesome operation.
上記目的達或のため、本発明では，入力映像信号から輪
郭部を抽出する輪郭抽出回路と、抽出された該輪郭部を
増幅して出力する可変利得増幅回路と、増幅された該輪
郭部と前記入力映像信号とを加算することにより輪郭部
を強調して出力する加算回路と、から成る映像信号の輪
郭補正回路において、ノイズ成分分離回路と、比較回路
と、可変利得増幅回路の利得を可変制御する制御手段と
、を具備した。To achieve the above object, the present invention includes a contour extraction circuit that extracts a contour from an input video signal, a variable gain amplification circuit that amplifies and outputs the extracted contour, and a contour extraction circuit that amplifies and outputs the extracted contour. A video signal contour correction circuit comprising: an addition circuit that emphasizes and outputs a contour by adding the input video signal; and a noise component separation circuit, a comparison circuit, and a variable gain amplifier circuit whose gains are variable. and control means for controlling.
ノイズ成分分離回路は、入力映像信号からノイズ成分を
抽出する。比較回路は、前記分離回路において分離され
たノイズ戊分電圧と基準電圧を比較し、その比較結果に
より前記可変利得増幅回路の利得を前記制御手段によっ
て可変制御する．これにより自動的に輪郭補正量の制御
が出来、操作上の煩わしさがなくなる。The noise component separation circuit extracts noise components from the input video signal. The comparison circuit compares the noise fractional voltage separated by the separation circuit with a reference voltage, and based on the comparison result, the gain of the variable gain amplifier circuit is variably controlled by the control means. This allows the amount of contour correction to be automatically controlled, eliminating any troublesome operations.
次に図を参照して本発明の実施例を説明する。 Next, embodiments of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例を示すブロック図であ杭
同図において、１は入力映像信号、２は輪郭抽出回路、
３は可変利得増幅器、４は加算回路、５は映像回路、６
は分離回路、７はピーク検波回路、８は比較回路、９は
基準電圧，である。FIG. 1 is a block diagram showing an embodiment of the present invention. In the same figure, 1 is an input video signal, 2 is a contour extraction circuit,
3 is a variable gain amplifier, 4 is an addition circuit, 5 is a video circuit, 6
7 is a separation circuit, 7 is a peak detection circuit, 8 is a comparison circuit, and 9 is a reference voltage.
回路動作は次の如くである。The circuit operation is as follows.
映像信号１は輪郭抽出回路２に入力され、ここで輪郭部
のみ抜き出された後，利得可変増幅器３にて増幅される
。この信号は元々の信号１と加算器４で加算され輪郭部
が強調された映像信号となり後段の増幅回路５に人力さ
れる。The video signal 1 is input to a contour extraction circuit 2, where only the contour portion is extracted, and then amplified by a variable gain amplifier 3. This signal is added to the original signal 1 in an adder 4, and becomes a video signal with enhanced contours, which is input manually to an amplifier circuit 5 at the subsequent stage.
一方映像信号１はノイズ成分のみを抽出する分離回路６
に入力され、ピーク検波回路６にてノイズレベルに比例
した直流電圧となる。On the other hand, the video signal 1 is a separation circuit 6 that extracts only noise components.
The peak detection circuit 6 converts the signal into a DC voltage proportional to the noise level.
この直流電圧は比較器８にて基準電圧９と比較される。This DC voltage is compared with a reference voltage 9 by a comparator 8.
比較器８の出力は可変増幅器３の利得制御端子に接続さ
れており、ピーク検波された直流電圧が基準電圧９より
も高くなると利得を下げる様に動作する。The output of the comparator 8 is connected to the gain control terminal of the variable amplifier 3, and operates to lower the gain when the peak detected DC voltage becomes higher than the reference voltage 9.
以上の動作によって入力信号にノイズが多く含まれると
輪郭補正量が少なくなり画面のノイズ量の増加も抑える
ことができ適正な映像を得る事が可能である。By the above operation, when the input signal contains a lot of noise, the amount of contour correction is reduced, and an increase in the amount of noise on the screen can be suppressed, making it possible to obtain a proper image.
第２図は第１図の実施例における要部の具体的回路図で
ある。同図において，映像信号は分離回路６内のトラン
ジスタ６３のベースに入力される。トランジスタ６３と
６４はゲート回路を構或しトランジスタ６４のベースに
はゲートパルスが人力されており，映像信号のプランキ
ング期間のノイズ成分のみを抵抗器６２の両端に得るこ
とが出来る。すなわちこの分離回路６により映像信号と
無関係なノイズ成分のみ取り出す事ができる。FIG. 2 is a specific circuit diagram of main parts in the embodiment of FIG. 1. In the figure, the video signal is input to the base of a transistor 63 in the separation circuit 6. The transistors 63 and 64 constitute a gate circuit, and a gate pulse is applied to the base of the transistor 64, so that only the noise component during the blanking period of the video signal can be obtained across the resistor 62. That is, this separation circuit 6 can extract only noise components unrelated to the video signal.
次に抵抗器６２両端のノイズ信弓一はダイオード７ｌ、
コンデンサ７２、抵抗器７３からなるピーク検波回路７
により、ノイズの量に比例した直流電圧が得られる。Next, the noise signal at both ends of the resistor 62 is a diode 7l,
Peak detection circuit 7 consisting of a capacitor 72 and a resistor 73
As a result, a DC voltage proportional to the amount of noise can be obtained.
この電圧は比較回路８の１ヘランジスタ８１のベースに
加えられ，基準電圧９とトランジスタ８１．８２により
比較される。ノイズの量が少ない場合は、トランジスタ
８２の基準電圧９はトランジスタ８１のベース電圧より
も高く設定しておく。これにより抵抗器８４の両端には
直流電圧がない。This voltage is applied to the base of the one-transistor transistor 81 of the comparator circuit 8, and compared with the reference voltage 9 by transistors 81 and 82. When the amount of noise is small, the reference voltage 9 of the transistor 82 is set higher than the base voltage of the transistor 81. Thereby, there is no DC voltage across the resistor 84.
一方ノイズの量が増え，トランジスタ８１のべ一入電圧
が基＄電圧９よりも高くなると、トランジスタ８１はカ
ットオフしトランジスタ８２がオンすることにより抵抗
器８４の両端には電圧が発生する。以上の比較器８から
の電圧により可変利得回路３の利得は、ノイズの量が多
くなると自動的に増幅度が下がる為輪郭補正量も少なく
なり、画面のノイズ強調も抑えることが可能である。On the other hand, when the amount of noise increases and the base voltage of the transistor 81 becomes higher than the base voltage 9, the transistor 81 is cut off and the transistor 82 is turned on, so that a voltage is generated across the resistor 84. Due to the voltage from the comparator 8, the gain of the variable gain circuit 3 automatically decreases the degree of amplification when the amount of noise increases, so the amount of contour correction also decreases, making it possible to suppress noise emphasis on the screen.
本発明によれば、ノイズの少ない映像信号においては輪
郭補正回路の効果を十分発揮でき、ノイズの多い信号で
もノイズの目立ち具合を自動的に抑えられる。According to the present invention, the effect of the contour correction circuit can be fully exhibited in a video signal with little noise, and the conspicuousness of noise can be automatically suppressed even in a signal with a lot of noise.
第ｌ図は本発明の一実施例を示すブロック図、第２図は
第１図の実施例における要部の具体的構成を示す回路図
，である。
１・・・映像信号、２・・・輪郭抽出回路、３・・・可
変利得増幅器、６・・・分離回路，７・・・ピーク検波
回路、８・・・比較回路、９・・・基準回路、６１・・
・ゲートパルス、６３，６４，８１．８２・・・トラン
ジスタ、６２，
７３，
８３，
８４・・・抵抗器、
７１・・・ダイオ
ード、
７３・・・コンデンサ。FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a specific configuration of the main parts of the embodiment of FIG. DESCRIPTION OF SYMBOLS 1...Video signal, 2...Contour extraction circuit, 3...Variable gain amplifier, 6...Separation circuit, 7...Peak detection circuit, 8...Comparison circuit, 9...Reference circuit, 61...
・Gate pulse, 63, 64, 81.82...Transistor, 62, 73, 83, 84...Resistor, 71...Diode, 73...Capacitor.
Claims (1)
、抽出された該輪郭部を増幅して出力する可変利得増幅
回路と、増幅された該輪郭部と前記入力映像信号とを加
算することにより輪郭部を強調して出力する加算回路と
、から成る映像信号の輪郭補正回路において、 入力映像信号からノイズ成分を抽出するノイズ成分分離
回路と、該分離回路において分離されたノイズ成分電圧
と基準電圧を比較する比較回路と、その比較結果により
前記可変利得増幅回路の利得を可変制御する制御手段と
、を具備したことを特徴とする輪郭補正回路。[Claims] 1. A contour extraction circuit that extracts a contour from an input video signal, a variable gain amplification circuit that amplifies and outputs the extracted contour, and the amplified contour and the input video. A video signal contour correction circuit comprising: an addition circuit that emphasizes and outputs a contour by adding a signal to the input video signal; and a noise component separation circuit that extracts a noise component from an input video signal; 1. A contour correction circuit comprising: a comparison circuit for comparing a noise component voltage and a reference voltage; and a control means for variably controlling the gain of the variable gain amplification circuit based on the comparison result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1231620A JPH0396078A (en) | 1989-09-08 | 1989-09-08 | Contour correction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1231620A JPH0396078A (en) | 1989-09-08 | 1989-09-08 | Contour correction circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0396078A true JPH0396078A (en) | 1991-04-22 |
Family
ID=16926365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1231620A Pending JPH0396078A (en) | 1989-09-08 | 1989-09-08 | Contour correction circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0396078A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996010886A1 (en) * | 1994-09-30 | 1996-04-11 | Matsushita Electric Industrial Co., Ltd. | Image pickup device |
-
1989
- 1989-09-08 JP JP1231620A patent/JPH0396078A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996010886A1 (en) * | 1994-09-30 | 1996-04-11 | Matsushita Electric Industrial Co., Ltd. | Image pickup device |
| US6040860A (en) * | 1994-09-30 | 2000-03-21 | Matsushita Electric Industrial Co., Ltd. | Imaging apparatus for supplying images with rich gradation across the entire luminance range for all subject types |
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