JPH04348671A - Contour correction circuit - Google Patents
Contour correction circuitInfo
- Publication number
- JPH04348671A JPH04348671A JP3151148A JP15114891A JPH04348671A JP H04348671 A JPH04348671 A JP H04348671A JP 3151148 A JP3151148 A JP 3151148A JP 15114891 A JP15114891 A JP 15114891A JP H04348671 A JPH04348671 A JP H04348671A
- Authority
- JP
- Japan
- Prior art keywords
- contour
- signal
- correction
- section
- outputs
- 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
- 238000012986 modification Methods 0.000 claims description 2
- 230000004048 modification Effects 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 11
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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- Picture Signal Circuits (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、ビデオカメラの信号処
理回路の一部である輪郭補正信号処理回路に利用され、
特に、輝度入力レベルに応じて輪郭補正信号の利得制御
を可能とした輪郭補正回路に関する。[Industrial Application Field] The present invention is applied to a contour correction signal processing circuit which is a part of a signal processing circuit of a video camera.
In particular, the present invention relates to a contour correction circuit that can control the gain of a contour correction signal according to a luminance input level.
【０００２】0002
【従来の技術】従来の輪郭補正回路では、輝度入力レベ
ルに応じて輪郭信号の利得制御を行うものは特になく、
図７（ａ）および（ｂ）に示すように、輝度レベルに関
係なく一様に輪郭補正を行っていた。[Prior Art] Conventional contour correction circuits do not specifically perform gain control of contour signals depending on the luminance input level.
As shown in FIGS. 7A and 7B, contour correction was performed uniformly regardless of the brightness level.
【０００３】図５はかかる従来の輪郭補正回路の一例の
要部を示すブロック構成図である。本従来例は、映像信
号１０を入力して輪郭信号１１を発生出力する輪郭信号
発生部１と、この出力された輪郭信号１１により入力さ
れる輝度信号１２を補正して輪郭補正輝度信号１４を出
力する輪郭補正部５とを備えている。FIG. 5 is a block diagram showing a main part of an example of such a conventional contour correction circuit. This conventional example includes a contour signal generating section 1 that inputs a video signal 10 and generates and outputs a contour signal 11, and a contour signal generator 1 that corrects an input luminance signal 12 using the output contour signal 11 to generate a contour-corrected luminance signal 14. The contour correction section 5 is also provided with an output contour correction section 5.
【０００４】図６はこの輪郭信号発生部１における輪郭
信号１１の発生過程を説明する波形図である。図におい
てＡ〜Ｇは各段階を示し、Ａに示す映像信号１０を、同
図ＢおよびＣのように１水平走査期間（１Ｈ）または１
垂直走査期間（１Ｖ）外付けの遅延線によって順次遅延
させ、これらの遅延させた映像信号を加、減算器で加算
また減算を行って、図６の場合には同図Ｇに示す垂直の
輪郭信号１１を発生する。FIG. 6 is a waveform diagram illustrating the process of generating the contour signal 11 in the contour signal generating section 1. In the figure, A to G indicate each stage, and the video signal 10 shown in A is transmitted for one horizontal scanning period (1H) or one
The vertical scanning period (1V) is sequentially delayed by an external delay line, and these delayed video signals are added or subtracted by an adder and a subtracter. In the case of Fig. 6, the vertical contour shown in Fig. A signal 11 is generated.
【０００５】そして、輪郭補正部５において、図７（ａ
）に示す入力される輝度信号１２に対して、この発生さ
れた輪郭信号１１により補正を施して、図７（ｂ）に示
す輪郭補正輝度信号１４を出力する。[0005] Then, in the contour correction section 5,
) is corrected using the generated contour signal 11, and a contour-corrected brightness signal 14 shown in FIG. 7(b) is output.
【０００６】[0006]
【発明が解決しようとする課題】前述した従来の輪郭補
正回路では、輝度レベルに応じて輪郭補正ができないた
め、輝度レベルの高い（明るい所）ところにも、輝度レ
ベルが低い（暗いところ）ところにも、一様に輪郭補正
がかかってしまうため、明るいところはより明るさが強
調されて画像がみづらくなる課題があった。[Problems to be Solved by the Invention] The conventional contour correction circuit described above cannot perform contour correction according to the brightness level, so it is difficult to perform contour correction in areas where the brightness level is high (bright areas) and where the brightness level is low (dark areas). However, because contour correction is applied uniformly, the brightness of bright areas is emphasized, making the image difficult to see.
【０００７】本発明の目的は、前記の課題を解消するこ
とにより、輝度レベルに応じ輪郭補正を行い見やすい画
像を得ることができる輪郭補正回路を提供することにあ
る。SUMMARY OF THE INVENTION An object of the present invention is to provide a contour correction circuit that can perform contour correction according to the brightness level and obtain an easily viewable image by solving the above-mentioned problems.
【０００８】[0008]
【課題を解決するための手段】本発明は、映像信号を入
力し輝度信号の輪郭を補正するための輪郭信号を出力す
る輪郭信号発生部と、入力される輝度信号を前記輪郭信
号により補正を行い輪郭補正輝度信号を出力する輪郭補
正部とを備えた輪郭補正回路において、前記輝度信号の
レベルに応じて前記輪郭信号を修正し、修正輪郭信号を
前記輪郭補正部に対して出力する輪郭信号修正手段を備
えたことを特徴とする。[Means for Solving the Problems] The present invention includes a contour signal generation section that inputs a video signal and outputs a contour signal for correcting the contour of a luminance signal, and a contour signal generator that corrects the input luminance signal using the contour signal. and a contour correction section that outputs a contour-corrected luminance signal; It is characterized by having a correction means.
【０００９】[0009]
【作用】輪郭信号修正手段は、輝度信号のレベルが大に
なるほど、輪郭信号のレベルが小さくなるように修正を
行った修正輪郭信号を輪郭補正部に対して出力する。[Operation] The contour signal modifying means outputs a modified contour signal to the contour correcting section, which is modified so that the level of the contour signal becomes smaller as the level of the luminance signal increases.
【００１０】従って、輪郭補正部では輝度信号のレベル
に応じて補正された輪郭補正輝度信号を出力することが
でき、見やすい画像を得られるようにすることが可能と
なる。[0010] Therefore, the contour correction section can output a contour-corrected brightness signal that is corrected according to the level of the brightness signal, making it possible to obtain an image that is easy to see.
【００１１】[0011]
【実施例】以下、本発明の実施例について図面を参照し
て説明する。Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.
【００１２】図１は本発明の一実施例の要部を示すブロ
ック構成図である。FIG. 1 is a block diagram showing the main parts of an embodiment of the present invention.
【００１３】本実施例は、映像信号１０を入力し輝度信
号の輪郭を補正するための輪郭信号１１を出力する輪郭
信号発生部１と、入力される輝度信号１２を輪郭信号１
１により補正を行い輪郭補正輝度信号１４を出力する輪
郭補正部５とを備えた輪郭補正回路において、本発明の
特徴とするところの、輝度信号１２のレベルに応じて輪
郭信号１１を修正し、修正輪郭信号１１ａを輪郭補正部
５に対して出力する輪郭信号修正手段としての、輝度信
号１２と基準電圧３を比較し制御信号１３を出力する輪
郭信号制御部２と、輪郭信号発生部１からの輪郭信号１
１を輪郭信号制御部２からの制御信号１３によりそのレ
ベルを修正し、修正輪郭信号１１ａを輪郭補正部５に対
して出力する輪郭信号修正部４とを含んでいる。This embodiment includes a contour signal generator 1 which inputs a video signal 10 and outputs a contour signal 11 for correcting the contour of a luminance signal, and a contour signal generator 1 which outputs a contour signal 11 for correcting the contour of a luminance signal, and a contour signal generator 1 which outputs a contour signal 11 for correcting the contour of a luminance signal.
In the contour correction circuit equipped with a contour correction section 5 that performs correction according to 1 and outputs a contour-corrected brightness signal 14, the contour signal 11 is corrected according to the level of the brightness signal 12, which is a feature of the present invention. A contour signal control section 2 that compares the luminance signal 12 with a reference voltage 3 and outputs a control signal 13 serves as a contour signal correction means that outputs a modified contour signal 11a to the contour correction section 5, and a contour signal generation section 1. contour signal 1
1 by a control signal 13 from a contour signal control section 2, and outputs a modified contour signal 11a to a contour correction section 5.
【００１４】図２は前記輪郭信号修正手段の具体例の一
つを示す回路図である。FIG. 2 is a circuit diagram showing one specific example of the contour signal modifying means.
【００１５】図２において、輪郭信号修正部４は、ＮＰ
Ｎ形のトランジスタＱ１〜Ｑ９と、抵抗Ｒ１〜Ｒ８とを
含み、入力として輪郭信号１１を入力し、差動増幅を行
い修正輪郭信号１１ａを出力する。In FIG. 2, the contour signal modification unit 4
It includes N-type transistors Q1 to Q9 and resistors R1 to R8, receives a contour signal 11 as an input, performs differential amplification, and outputs a modified contour signal 11a.
【００１６】また、輪郭信号制御部２は、ＮＰＮ形のト
ランジスタＱ１０〜Ｑ１６と、ＰＮＰ形のトランジスタ
Ｑ２１およびＱ２２と、ダイオードＤ１〜Ｄ３と、抵抗
Ｒ９〜Ｒ１５とを含み、トランジスタＱ１１およびＱ１
２からなるコンパレータで、輝度信号１０と基準電圧３
とを比較し、比較の結果を制御信号１３としてトランジ
スタＱ１０を介してトランジスタＱ７のベースに与える
。The contour signal control unit 2 also includes NPN transistors Q10 to Q16, PNP transistors Q21 and Q22, diodes D1 to D3, and resistors R9 to R15.
A comparator consisting of 2 luminance signals 10 and a reference voltage 3
The result of the comparison is applied as a control signal 13 to the base of transistor Q7 via transistor Q10.
【００１７】なお、図２において、６は電源部で、ＮＰ
Ｎ形のトランジスタＱ１７〜Ｑ２０と、抵抗Ｒ１６〜Ｒ
１８とを含み、電源ＶＣＣにより所定の電圧を生成し、
トランジスタＱ４、Ｑ５、Ｑ９、Ｑ１３、Ｑ１５および
Ｑ１６のベースに供給する。Note that in FIG. 2, 6 is a power supply section, and NP
N-type transistors Q17 to Q20 and resistors R16 to R
18, generating a predetermined voltage by the power supply VCC,
Supplies the bases of transistors Q4, Q5, Q9, Q13, Q15 and Q16.
【００１８】次に、本実施例の動作について図３（ａ）
、（ｂ）および（ｃ）ならびに図４（ａ）および（ｂ）
を参照して説明する。Next, the operation of this embodiment is shown in FIG. 3(a).
, (b) and (c) and Fig. 4(a) and (b)
Explain with reference to.
【００１９】輝度信号１２はトランジスタＱ１４を介し
てトランジスタＱ１２のベースに入力され、一方基準電
圧３はトランジスタＱ１１のベースに入力され、トラン
ジスタＱ１１およびＱ１２からなるコンパレータで比較
され、制御信号１３をダイオードＤ１〜Ｄ３およびトラ
ンジスタＱ１０を介して、トランジスタＱ７のベースに
入力される。The luminance signal 12 is inputted to the base of the transistor Q12 via the transistor Q14, while the reference voltage 3 is inputted to the base of the transistor Q11 and compared by a comparator consisting of transistors Q11 and Q12, and the control signal 13 is inputted to the base of the transistor Q12. ~D3 and is input to the base of transistor Q7 via transistor Q10.
【００２０】この制御信号１３の入力によりトランジス
タＱ７のベース電位が変化しそれに応じて制御電流Ｉが
流れる。これによりトランジスタＱ１およびＱ６で構成
される差動増幅器の利得が変化し、これに応じた修正輪
郭信号１１ａがトランジスタＱ８を介して出力される。The input of this control signal 13 changes the base potential of the transistor Q7, and the control current I flows accordingly. This changes the gain of the differential amplifier composed of transistors Q1 and Q6, and a modified contour signal 11a corresponding to this is outputted via transistor Q8.
【００２１】この出力される修正輪郭信号１１ａは、図
３（ｂ）および（ｃ）に示すように、図（ａ）に示す入
力された輪郭信号１１が、輝度信号１２のレベルの大き
さに応じて小さくなるように修正されて出力される。As shown in FIGS. 3(b) and 3(c), this output corrected contour signal 11a is obtained by adjusting the input contour signal 11 shown in FIG. The output is corrected and output accordingly.
【００２２】この結果、輪郭補正部５からは、図４（ａ
）に示す輝度信号１２に対して、図４（ｂ）に示すよう
に、レベルの小さいときは大きく、レベルが高くなるに
つれて段々小さく輪郭補正された輪郭補正輝度信号１４
が出力される。As a result, the contour correction section 5 outputs the image shown in FIG. 4(a).
), as shown in FIG. 4(b), the contour-corrected brightness signal 14 is large when the level is small, and gradually becomes smaller as the level becomes higher.
is output.
【００２３】[0023]
【発明の効果】以上説明したように、本発明は、輝度レ
ベルに応じて、輪郭補正信号の利得制御を可能とした回
路を有することで、輝度レベルの高い（明るい所）所を
強調しすぎるということはなく、見やすい画像を得るこ
とができる効果がある。[Effects of the Invention] As explained above, the present invention has a circuit that can control the gain of the contour correction signal according to the brightness level, thereby over-emphasizing areas with high brightness levels (bright places). This has the effect of making it possible to obtain an image that is easy to view.
【図１】本発明の一実施例を示すブロック構成図。FIG. 1 is a block diagram showing an embodiment of the present invention.
【図２】その輪郭修正手段の具体例を示す回路図。FIG. 2 is a circuit diagram showing a specific example of the contour correction means.
【図３】その輪郭信号制御部の動作を示す波形図。FIG. 3 is a waveform diagram showing the operation of the contour signal control section.
【図４】その輪郭補正部の動作を示す波形図。FIG. 4 is a waveform diagram showing the operation of the contour correction section.
【図５】従来例を示すブロック構成図。FIG. 5 is a block configuration diagram showing a conventional example.
【図６】その輪郭信号発生部の動作を示す波形図。FIG. 6 is a waveform diagram showing the operation of the contour signal generating section.
【図７】その輪郭補正部の動作を示す波形図。FIG. 7 is a waveform diagram showing the operation of the contour correction section.
１ 輪郭信号発生部
２ 輪郭信号制御部
３ 基準電圧
４ 輪郭信号修正部
５ 輪郭補正部
６ 電源部
１０ 映像信号
１１ 輪郭信号
１１ａ 修正輪郭信号
１２ 輝度信号
１３ 制御信号
１４ 輪郭補正輝度信号
Ｄ１〜Ｄ３ ダイオード
Ｑ１〜Ｑ２０ （ＮＰＮ形の）トランジスタＱ２１、
Ｑ２２（ＰＮＰ形の）トランジスタＲ１〜Ｒ１８ 抵
抗
ＶＣＣ 電源1 Contour signal generation section 2 Contour signal control section 3 Reference voltage 4 Contour signal correction section 5 Contour correction section 6 Power supply section 10 Video signal 11 Contour signal 11a Modified contour signal 12 Luminance signal 13 Control signal 14 Contour correction luminance signal D1 to D3 Diode Q1-Q20 (NPN type) transistor Q21,
Q22 (PNP type) transistors R1 to R18 Resistor VCC Power supply
Claims (1)
正するための輪郭信号を出力する輪郭信号発生部と、入
力される輝度信号を前記輪郭信号により補正を行い輪郭
補正輝度信号を出力する輪郭補正部とを備えた輪郭補正
回路において、前記輝度信号のレベルに応じて前記輪郭
信号を修正し、修正輪郭信号を前記輪郭補正部に対して
出力する輪郭信号修正手段を備えたことを特徴とする輪
郭補正回路。1. A contour signal generating section that inputs a video signal and outputs a contour signal for correcting the contour of a luminance signal, and that corrects the input luminance signal using the contour signal and outputs a contour-corrected luminance signal. A contour correction circuit comprising a contour correction section, further comprising contour signal modification means for modifying the contour signal according to the level of the luminance signal and outputting a modified contour signal to the contour correction section. contour correction circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3151148A JPH04348671A (en) | 1991-05-27 | 1991-05-27 | Contour correction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3151148A JPH04348671A (en) | 1991-05-27 | 1991-05-27 | Contour correction circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04348671A true JPH04348671A (en) | 1992-12-03 |
Family
ID=15512423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3151148A Pending JPH04348671A (en) | 1991-05-27 | 1991-05-27 | Contour correction circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04348671A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999005855A1 (en) * | 1997-07-25 | 1999-02-04 | Fujitsu General Limited | Contour emphasizing circuit |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS536523A (en) * | 1976-07-07 | 1978-01-21 | Matsushita Electric Ind Co Ltd | Picture quality adjuster |
| JPS592410A (en) * | 1982-06-28 | 1984-01-09 | Sony Corp | Current amplifier |
| JPS63164765A (en) * | 1986-12-26 | 1988-07-08 | Matsushita Electric Ind Co Ltd | Picture quality compensating device |
| JPS63198483A (en) * | 1987-02-13 | 1988-08-17 | Toshiba Corp | Picture-quality adjusting circuit |
| JPS63290469A (en) * | 1987-05-22 | 1988-11-28 | Matsushita Electric Ind Co Ltd | Contour correction device |
| JPH01123575A (en) * | 1987-11-09 | 1989-05-16 | Sony Corp | Video signal processor |
| JPH0236675A (en) * | 1988-07-27 | 1990-02-06 | Nec Corp | Method and circuit for picture emphasis |
| JPH0252576A (en) * | 1988-08-16 | 1990-02-22 | Nippon Hoso Kyokai <Nhk> | Picture quality adjustment circuit |
| JPH03120962A (en) * | 1989-10-04 | 1991-05-23 | Sony Corp | Video signal processing circuit for solid-state image pickup device |
-
1991
- 1991-05-27 JP JP3151148A patent/JPH04348671A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS536523A (en) * | 1976-07-07 | 1978-01-21 | Matsushita Electric Ind Co Ltd | Picture quality adjuster |
| JPS592410A (en) * | 1982-06-28 | 1984-01-09 | Sony Corp | Current amplifier |
| JPS63164765A (en) * | 1986-12-26 | 1988-07-08 | Matsushita Electric Ind Co Ltd | Picture quality compensating device |
| JPS63198483A (en) * | 1987-02-13 | 1988-08-17 | Toshiba Corp | Picture-quality adjusting circuit |
| JPS63290469A (en) * | 1987-05-22 | 1988-11-28 | Matsushita Electric Ind Co Ltd | Contour correction device |
| JPH01123575A (en) * | 1987-11-09 | 1989-05-16 | Sony Corp | Video signal processor |
| JPH0236675A (en) * | 1988-07-27 | 1990-02-06 | Nec Corp | Method and circuit for picture emphasis |
| JPH0252576A (en) * | 1988-08-16 | 1990-02-22 | Nippon Hoso Kyokai <Nhk> | Picture quality adjustment circuit |
| JPH03120962A (en) * | 1989-10-04 | 1991-05-23 | Sony Corp | Video signal processing circuit for solid-state image pickup device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999005855A1 (en) * | 1997-07-25 | 1999-02-04 | Fujitsu General Limited | Contour emphasizing circuit |
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