JPH03151790A - Contour correction circuit for color signal - Google Patents

Contour correction circuit for color signal

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Publication number
JPH03151790A
JPH03151790A JP1288878A JP28887889A JPH03151790A JP H03151790 A JPH03151790 A JP H03151790A JP 1288878 A JP1288878 A JP 1288878A JP 28887889 A JP28887889 A JP 28887889A JP H03151790 A JPH03151790 A JP H03151790A
Authority
JP
Japan
Prior art keywords
signal
circuit
color
contour
contour 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.)
Pending
Application number
JP1288878A
Other languages
Japanese (ja)
Inventor
Yasuhiro Hirano
裕弘 平野
Kazuo Ishikura
石倉 和夫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP1288878A priority Critical patent/JPH03151790A/en
Publication of JPH03151790A publication Critical patent/JPH03151790A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To realize contour correction while a chroma contour signal component is reduced by adding to an original signal the edge addition information whose amplitude level is obtained through the signal processing so as to make a negative signal component zero with respect to a high frequency signal component extracted from a color signal. CONSTITUTION:A high frequency component extraction circuit 1 extracts high frequency signal components IH, QH, from color difference signals I, Q. A nonlinear processing circuit 2 applies nonlinear signal processing to make the negative level component of the signal components IH, QH, zero to generate edge addition information signals IE, QE used for the contour correction. These signals are added to a primary color difference signal subjected to delay adjustment by a delay circuit 3 at an adder circuit 4 to form correction signals IC, QC. Thus, a contour correction circuit with stable operation for a color signal is realized with simple circuit configuration.

Description

【発明の詳細な説明】 (1) (産業上の利用分野〕 本発明はカラー画像信号の表わす画像の鮮鋭度を改善す
る色信号の輪郭補正回路に関する。
DETAILED DESCRIPTION OF THE INVENTION (1) (Field of Industrial Application) The present invention relates to a color signal contour correction circuit for improving the sharpness of an image represented by a color image signal.

〔従来の技術〕[Conventional technology]

画像信号の表わす画像の鮮鋭度を改善する方法には画像
信号の空間周波数レスポンス補正があり、従来から使用
されているアパーチャ補正や輪郭補償などが含まれる。
Methods for improving the sharpness of an image represented by an image signal include spatial frequency response correction of the image signal, which includes conventionally used aperture correction, contour compensation, and the like.

そして、カラー画像を構成する色信号に対する空間周波
数レスポンス補正については、特公昭51−45423
号公報に記載のように、各彩色部分の外側に補色となっ
て付加されるクロマ外郭信号成分を低減させる輪郭補正
などが行なわれている。
Regarding spatial frequency response correction for color signals constituting a color image, Japanese Patent Publication No. 51-45423
As described in the above publication, contour correction is performed to reduce the chroma contour signal component added as a complementary color to the outside of each colored portion.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上記従来技術は、クロマ外郭信号成分の低減、あるいは
除去を図るための制御が複雑なため、動作の安定性など
に問題があった。
The above-mentioned conventional technology has problems in operational stability and the like because the control for reducing or removing the chroma outer signal component is complicated.

本発明の目的は、上記の問題点を解決し、WJ単な回路
構成でクロマ外郭信号成分の低減を図った色信号の空間
周波数レスポンス補正を実現する軸(2) 郭補正回路を提供することにある。
An object of the present invention is to solve the above-mentioned problems and provide an axis (2) contour correction circuit that realizes spatial frequency response correction of a color signal that aims to reduce chroma contour signal components with a simple WJ circuit configuration. It is in.

本発明の他の目的は、現行カラーテレビジョン方式のよ
うな狭帯域の色信号に対して、視覚特性に適合した、不
自然感のない空間周波数レスポンス補正を実現する輪郭
補正回路を提供することにある。
Another object of the present invention is to provide a contour correction circuit that realizes spatial frequency response correction that is compatible with visual characteristics and does not give an unnatural feeling, for narrowband color signals such as those used in current color television systems. It is in.

〔課題を解決するための手段〕[Means to solve the problem]

上記目的を達成するために、色信号より抽出した高周波
信号成分に対し、振幅レベルが負極性の信号成分は零と
なるような信号処理を行なって得られるエツジ付加情報
を、原信号に加算することにより、クロマ外郭部信号成
分を低減した輪郭補正を実現したものである。
In order to achieve the above objective, edge additional information obtained by performing signal processing on high frequency signal components extracted from color signals such that signal components with negative amplitude levels become zero is added to the original signal. As a result, contour correction is realized in which the chroma outer edge signal component is reduced.

さらに、画像の輪郭領域において、輪郭境界部からの距
離に応じて、原信号に加算するエツジ付加情報の量を変
化させることにより、狭帯域な色信号に対しても不自然
感のない空間周波数レスポンス補正を実現したものであ
る。
Furthermore, in the contour area of the image, by changing the amount of edge additional information added to the original signal according to the distance from the contour boundary, we have added a spatial frequency that does not look unnatural even for narrow-band color signals. This realizes response correction.

〔作用〕[Effect]

第1図に本発明による空間周波数レスポンス補(3) 正における補正信号波形の形成の過程を示す信号波形図
を示す。
FIG. 1 shows a signal waveform diagram showing the process of forming a correction signal waveform in spatial frequency response correction (3) positive according to the present invention.

原信号Aに対し、2次微分などの操作により高周波信号
成分Bを抽出する。この信号成分Bに対し、振幅極性が
負レベルの領域では、その振幅値を零とするような信号
処理を行ない、エツジ付加情報信号Cを生成する。そし
て、この信号Cを原信号Aに加算して、補正信号りを形
成する。なお、高周波信号成分Bをそのまま原信号に加
算した場合には、図中の点線で示す特性の補正信号が形
成され、クロマ外郭部信号が発生する。しかしながら、
本発明のように信号Cを加算することで、この種のクロ
マ外郭部信号を除去した補正信号が形成できる。
A high-frequency signal component B is extracted from the original signal A by performing operations such as second-order differentiation. For this signal component B, signal processing is performed to reduce the amplitude value to zero in a region where the amplitude polarity is a negative level, and an edge additional information signal C is generated. This signal C is then added to the original signal A to form a correction signal. Note that when the high frequency signal component B is added as is to the original signal, a correction signal having the characteristics shown by the dotted line in the figure is formed, and a chroma outer part signal is generated. however,
By adding the signal C as in the present invention, a correction signal from which this type of chroma outer part signal is removed can be formed.

一方、色信号は多くの場合、輝度信号に比較して、信号
帯域幅が狭く、その信号波形は同図Eに示すように波形
変化もなだらかな特性の場合が多い。この種の信号に対
して、高周波信号成分Fを抽出し、その負極性レベルの
信号成分は零とする信号処理で得られたエツジ付加情報
信号Gを原信(4) 号Eに加算して形成した補正信号工では、点線に示す特
性のものとなる。そして、視覚的には、画像の輪郭部境
界で縁どりされた様な模様として知覚され、不自然感が
発生する。
On the other hand, the chrominance signal often has a narrower signal bandwidth than the luminance signal, and its signal waveform often has a characteristic in which the waveform changes gradually, as shown in FIG. For this type of signal, the high-frequency signal component F is extracted and the signal component with a negative polarity level is set to zero.The edge-added information signal G obtained by signal processing is added to the original signal (4) No. E. The corrected signal engineer has the characteristics shown in the dotted line. Visually, the image is perceived as a bordered pattern, creating an unnatural feeling.

このため1輪郭領域では、同図Hに示すようにエツジ付
加係数keを変化させ、原信号に加算するエツジ付加情
報信号の量を制御することによって、同図の実線で示す
特性の補正信号■を形成することにより、境界部で発生
する縁どり模様を低減して、不自然感のない輪郭補正を
実現する。
For this reason, in one contour area, by changing the edge addition coefficient ke as shown in H in the figure and controlling the amount of edge addition information signal added to the original signal, a correction signal with the characteristic shown by the solid line in the figure can be obtained. By forming , it is possible to reduce the fringing pattern that occurs at the border and realize contour correction without an unnatural feeling.

〔実施例〕〔Example〕

以下、本発明の一実施例を第2図により説明する。本実
施例は、色信号に色差信号I、Qを使用した場合の一例
を示す。
An embodiment of the present invention will be described below with reference to FIG. This embodiment shows an example in which color difference signals I and Q are used as color signals.

高域成分抽出回路1は、色差信号I、Qより、その高周
波信号成分Iot Qoを抽出する。非線形処理回路2
では、工HIQH信号に対して負極性レベルの成分を零
とする非線形な信号処理を行ない、輪郭補正に使用する
エツジ付加情報信号IEI QEを生成する。これらの
信号は、加算回路4におい(5) て、遅延回路3で遅延調整した原色差信号に加算して、
補正信号Ic、Qcを形成する。
The high frequency component extraction circuit 1 extracts the high frequency signal component IotQo from the color difference signals I and Q. Nonlinear processing circuit 2
Then, non-linear signal processing is performed on the HIQH signal to zero the negative polarity level component to generate an edge additional information signal IEI QE used for contour correction. These signals are added to the primary color difference signal whose delay has been adjusted by the delay circuit 3 in the adder circuit 4 (5), and
Correction signals Ic and Qc are formed.

高域成分抽出回路1の一構成例、ならびに特性例を第3
図〜第6図に示す。
A configuration example and characteristic example of the high frequency component extraction circuit 1 are shown in the third section.
As shown in FIGS.

第3図において、τ遅延回路5でそれぞれ時間τずつ遅
延させた信号を、係数加重回路6でそれぞれ一1/4.
1/2.−1/4の係数加重を行ない、これらを加算回
路7で加算することにより、第4図に示す特性で高周波
成分を抽出する。
In FIG. 3, signals delayed by a time τ in a τ delay circuit 5 are sent to a coefficient weighting circuit 6 by a time of 1/4.
1/2. By applying coefficient weighting of -1/4 and adding these in the adder circuit 7, high frequency components are extracted with the characteristics shown in FIG.

また、第5図は、水平、垂直の2次元周波数特性で高周
波成分の抽出を図る場合の一構成例で、垂直HPF回路
8、水平HPF回路9の継続接続で構成したものである
。このうち、垂直HPF回路8は、例えば第6図に示す
ように、1ライン遅延回路10で一走査線相当を遅延し
た信号にそれぞれ係数−1/4.1/2.−1/4を加
重加算する構成で実現できる。また、水平HPF回路9
は、例えば先に示した第3図の構成で実現できる。
Further, FIG. 5 shows an example of a configuration in which high frequency components are extracted using horizontal and vertical two-dimensional frequency characteristics, and is configured by continuously connecting a vertical HPF circuit 8 and a horizontal HPF circuit 9. Of these, the vertical HPF circuit 8 applies coefficients -1/4, 1/2, etc. to the signals delayed by one scanning line in the one-line delay circuit 10, as shown in FIG. 6, for example. This can be realized by a configuration in which -1/4 is weighted and added. In addition, the horizontal HPF circuit 9
This can be realized, for example, by the configuration shown in FIG. 3 above.

一方、非線形処理回路2は、その入出力特性がベルでは
入力信号に比例した出力信号、入力信号が負レベルでは
出力信号が零となるようなものである。そして、信号処
理がディジタルの場合には、第8図に示す様に、ROM
によるテーブルルックアップの手法で、関数ROMII
によりこの特性を簡単に実現できる。
On the other hand, the nonlinear processing circuit 2 has an input/output characteristic such that an output signal is proportional to the input signal when the input signal is at a bell level, and an output signal is zero when the input signal is at a negative level. If the signal processing is digital, as shown in Figure 8, the ROM
The table lookup method by the function ROMII
This characteristic can be easily realized by

以上、本実施例によれば、簡単な回路構成で、動作の安
定性の良い色信号の輪郭補正回路が実現できる。
As described above, according to this embodiment, a color signal contour correction circuit with a simple circuit configuration and good operational stability can be realized.

次に、本発明の他の一実施例を第9図に示す。Next, another embodiment of the present invention is shown in FIG.

この実施例は、エツジ付加係数keを輪郭領域で変化さ
せて、原信号に加算するエツジ付加情報信号の量を変え
る場合の構成例である。先に示した第2図の実施例との
相異は、エツジ付加係数keの設定機能が追加されたこ
とにある。
This embodiment is a configuration example in which the edge addition coefficient ke is changed in the contour region to change the amount of the edge addition information signal to be added to the original signal. The difference from the embodiment shown in FIG. 2 above is that a function for setting the edge addition coefficient ke is added.

この実施例では、色差信号の高周波成分信号IHIQH
により輪郭領域の検出、ならびにエツジ付加係数keの
設定を、エツジ付加係数ke決定回路12で行なう。そ
して、エツジ付加情報信号IEIQHに対し、係数乗算
回路13ではkeを乗(7) 算し、得られたkeIE、keQEを原信号に加算して
補正信号Ic、Qcを形成する。
In this embodiment, the high frequency component signal IHIQH of the color difference signal is
Accordingly, the edge addition coefficient ke determining circuit 12 detects the contour area and sets the edge addition coefficient ke. Then, the edge additional information signal IEIQH is multiplied by ke (7) in the coefficient multiplication circuit 13, and the obtained keIE and keQE are added to the original signal to form correction signals Ic and Qc.

第10図は、エツジ付加係数ke決定回路12の一構成
例を示す。量子化回路14は、その入出力特性の一例が
第11図に示す様な特性で、入力化回路15で空間的な
平滑化処理を行ない、出力信号S AV[Eを生成する
FIG. 10 shows an example of the configuration of the edge addition coefficient ke determining circuit 12. The quantization circuit 14 has input/output characteristics as shown in FIG. 11, and the input circuit 15 performs spatial smoothing processing to generate an output signal S AV[E.

この平滑化回路の一構成例を第12図に示す。An example of the structure of this smoothing circuit is shown in FIG.

これは一種のLPF回路で、画素遅延回路17で一画素
相当の遅延した信号系列に対し、係数加重回路18で係
数a−Z+ a−t、ao、al、a2を加重し、加算
回路19でこれらのものの加算を行なって平滑化出力信
号S AVEを生成する。この平滑化処理では、係数a
+の設定によって、任意の特性が実現できるが、その代
表例を第13図に示す。
This is a type of LPF circuit, in which a signal sequence delayed by one pixel in a pixel delay circuit 17 is weighted by coefficients a-Z+a-t, ao, al, a2 in a coefficient weighting circuit 18, and then in an adder circuit 19. These are added to generate the smoothed output signal SAVE. In this smoothing process, the coefficient a
By setting +, arbitrary characteristics can be realized, and a typical example thereof is shown in FIG.

なお、この構成例では水平方向のみの平滑化処理が行な
われるが、隣接する上下の走査線の画素も使用すること
によって、水平、垂直の2次元周波(8) 数領域での平滑化処理も可能である。
Note that in this configuration example, smoothing processing is performed only in the horizontal direction, but by also using pixels from adjacent upper and lower scanning lines, smoothing processing can also be performed in the horizontal and vertical two-dimensional frequency (8) frequency domain. It is possible.

ke設定回路16は、平滑化信号5AVEのレベルに応
じて1例えば第14図に示す様にO〜αまでのエツジ付
加係数keを設定する。この特性は、実線で示すもの、
あるいは点線に示すような様々なもので実現できる。
The ke setting circuit 16 sets an edge addition coefficient ke from 0 to α, for example, as shown in FIG. 14, depending on the level of the smoothing signal 5AVE. This characteristic is shown by the solid line,
Alternatively, it can be realized by various things as shown by the dotted line.

以上、述べた様に、本実施例によれば、エツジ付加係数
keを画像の輪郭領域で変化させることによって、更に
視覚特性に整合した空間周波数レスポンス補正が簡単に
実現できる。
As described above, according to this embodiment, by changing the edge addition coefficient ke in the contour region of the image, it is possible to easily realize spatial frequency response correction that is more consistent with visual characteristics.

次に、第15図〜第18図に、本発明の他の一実施例を
示す。第15図は、エツジ付加係数keを、色差信号よ
り広帯域な信号、例えば輝度信号などから設定する場合
の構成例である。すなわち、輝度信号Yの高周波成分Y
Hを輪郭情報検出回路20で抽出する。そして、このY
H倍信号もとに、エツジ付加係数ke決定回路12で、
keを設定する。
Next, FIG. 15 to FIG. 18 show another embodiment of the present invention. FIG. 15 shows a configuration example in which the edge addition coefficient ke is set from a signal having a wider band than a color difference signal, such as a luminance signal. That is, the high frequency component Y of the luminance signal Y
H is extracted by the contour information detection circuit 20. And this Y
Based on the H-fold signal, the edge addition coefficient ke determination circuit 12
Set ke.

また、第16図、第17図の実施例は、先に示した第9
図および第15図の実施例において、非(9) 線形処理回路2を省略したもので、回路の簡素化を図っ
たものである。
Further, the embodiments shown in FIGS. 16 and 17 are similar to the embodiment shown in FIG.
In the embodiments shown in FIG. 1 and FIG. 15, the non-(9) linear processing circuit 2 is omitted to simplify the circuit.

さらに、第18図の実施例は、色差信号I、Qより画像
の輪郭領域の抽出を行なうようにした場合の構成例であ
る。
Furthermore, the embodiment shown in FIG. 18 is an example of a configuration in which the contour area of the image is extracted from the color difference signals I and Q.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、簡単な構成で、視覚特性に整合した、
不自然感のない色信号の空間周波数レスポンス補正を実
現する輪郭補正回路が出来るので、画像の高画質化に大
きな効果がある。
According to the present invention, it has a simple configuration and matches visual characteristics.
Since it is possible to create a contour correction circuit that realizes spatial frequency response correction of color signals without any unnatural appearance, it has a great effect on improving the quality of images.

なお、本実施例においては、色信号としては色差信号I
、Qの場合について説明したが、これに限定されること
はなく、例えば、R−Y、B−Yなどの他の色差信号の
組み合せに対しても適用可能なことは明らかである。
In this embodiment, the color signal is a color difference signal I.
, Q has been described, but the present invention is not limited thereto, and it is obvious that the present invention can also be applied to other color difference signal combinations such as RY, BY, and the like.

また、信号処理の形態は、アナログ、ディジタル、もし
くは両者の混合のいずれに対しても可能なことは明らか
である。
It is also clear that the form of signal processing can be analog, digital, or a mixture of both.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の輪郭補正回路における補正信(10) 号波形形成の過程を示す信号波形図、第2図、第9図、
第15図〜第18図は本発明の一実施例の全体ブロック
構成図、第3図〜第6図は、この構成要素の一つである
高域成分抽出回路の一構成例、ならびに特性例を示す図
、第7図、第8図は非線形処理回路の一特性例ならびに
構成例を示す図、第10図〜第14図は、エツジ付加係
数ke決定回路の一構成例ならびに特性例を示す図であ
る。 1・・・高域成分抽出回路、2・・・非線形処理回路、
3・・・遅延回路、4・・・加算回路、5・・・τ遅延
回路、6・・・係数加重回路、7・・・加算回路、8・
・・垂直HPF回路、9・・・水平HPF回路、10・
・・1ライン遅延回路、11・・・関数ROM、12・
・・エツジ付加係数ke決定回路、13・・・係数乗算
回路、14・・・量子化回路、15・・・平滑化回路、
16・・・ke設定回路、17・・・画素遅延回路、1
8・・・係数加算回路、19・・・加算回路、20・・
・輪郭情報検出回路。
FIG. 1 is a signal waveform diagram showing the process of forming the correction signal (10) waveform in the contour correction circuit of the present invention; FIGS. 2 and 9;
Figures 15 to 18 are overall block configuration diagrams of an embodiment of the present invention, and Figures 3 to 6 are examples of the configuration and characteristics of a high-frequency component extraction circuit, which is one of the components. FIGS. 7 and 8 are diagrams showing an example of the characteristics and configuration of a nonlinear processing circuit, and FIGS. 10 to 14 are diagrams showing an example of the configuration and characteristics of the edge addition coefficient ke determining circuit. It is a diagram. 1... High frequency component extraction circuit, 2... Nonlinear processing circuit,
3... Delay circuit, 4... Adding circuit, 5... τ delay circuit, 6... Coefficient weighting circuit, 7... Adding circuit, 8...
・Vertical HPF circuit, 9 ・Horizontal HPF circuit, 10・
・・1 line delay circuit, 11・・Function ROM, 12・
... edge addition coefficient ke determination circuit, 13 ... coefficient multiplication circuit, 14 ... quantization circuit, 15 ... smoothing circuit,
16...ke setting circuit, 17...pixel delay circuit, 1
8... Coefficient addition circuit, 19... Addition circuit, 20...
・Contour information detection circuit.

Claims (1)

【特許請求の範囲】[Claims] 1、原信号の高周波成分を抽出して、エッジ付加情報信
号として前記原信号に加算して当該原信号のレスポンス
特性を視覚に適合するように補正する輪郭補正回路にお
いて、カラー画像を構成する色差信号を前記原信号とす
るとともに、当該高周波成分の負極性部を零レベルとし
たものをエッジ付加情報信号とすることを特徴とする色
信号の輪郭補正回路。2、エッジ付加情報信号のレベル
をエッジ付加係数keに対応して制御する手段を有し、
カラー画像の輪郭領域において、エッジ付加係数keを
変化させることにより、色差信号に施す輪郭補正の特性
を任意に修正しうるようにしたことを特徴とする請求項
1記載の色信号の輪郭補正回路。
1. In a contour correction circuit that extracts high-frequency components of an original signal and adds them to the original signal as an edge-added information signal to correct the response characteristics of the original signal to suit visual perception, the color difference that makes up the color image is corrected. A contour correction circuit for a color signal, characterized in that a signal is the original signal, and a signal with a negative polarity portion of the high frequency component set to zero level is used as an edge additional information signal. 2. having means for controlling the level of the edge addition information signal in accordance with the edge addition coefficient ke;
2. The color signal contour correction circuit according to claim 1, wherein characteristics of the contour correction applied to the color difference signal can be arbitrarily modified by changing the edge addition coefficient ke in the contour region of the color image. .
JP1288878A 1989-11-08 1989-11-08 Contour correction circuit for color signal Pending JPH03151790A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1288878A JPH03151790A (en) 1989-11-08 1989-11-08 Contour correction circuit for color signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1288878A JPH03151790A (en) 1989-11-08 1989-11-08 Contour correction circuit for color signal

Publications (1)

Publication Number Publication Date
JPH03151790A true JPH03151790A (en) 1991-06-27

Family

ID=17735936

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1288878A Pending JPH03151790A (en) 1989-11-08 1989-11-08 Contour correction circuit for color signal

Country Status (1)

Country Link
JP (1) JPH03151790A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002039416A1 (en) * 2000-10-25 2002-05-16 Sony Corporation Image processing device
US20100022958A1 (en) * 2008-04-28 2010-01-28 Ethicon Endo-Surgery, Inc. Surgical access devices with sorbents

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002039416A1 (en) * 2000-10-25 2002-05-16 Sony Corporation Image processing device
US20100022958A1 (en) * 2008-04-28 2010-01-28 Ethicon Endo-Surgery, Inc. Surgical access devices with sorbents

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