JPH0392087A - Contour emphasis device - Google Patents
Contour emphasis deviceInfo
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- JPH0392087A JPH0392087A JP1228215A JP22821589A JPH0392087A JP H0392087 A JPH0392087 A JP H0392087A JP 1228215 A JP1228215 A JP 1228215A JP 22821589 A JP22821589 A JP 22821589A JP H0392087 A JPH0392087 A JP H0392087A
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- 238000001514 detection method Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 description 4
- 239000003086 colorant Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
く産業上の利用分野〉
本発明は輪郭強調装置に関し、詳しくは、画像の色に応
じて輪郭強調レベルを可変できる装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an edge enhancement device, and more particularly, to a device that can vary the edge enhancement level depending on the color of an image.
〈従来の技術〉
従来から、テレビカメラ等の画像入力処理装置において
は、被写体画像の鮮鋭さを高めるため、一般に輪郭強調
装置が組み込まれている。<Prior Art> Conventionally, image input processing devices such as television cameras have generally incorporated an edge enhancement device in order to enhance the sharpness of a subject image.
この輪郭強調回路としては、例えば主信号よりも数倍大
きなアパーチャでサンプリングされて平均化されボケた
サブ信号を前記主信号に加減算することで、画像の輪郭
部分のみ強調されたアンシャープマスク信号（輪郭強調
信号）を得て、このアンシャープマスク信号を主信号に
加算することで画像の輪郭部分が強調された信号を得る
ようにするものがある．また、３原色信号のうちの緑色
信号（輝度信号）を微分して輪郭信号を抽出し、これに
比例した輪郭強調信号を元の３原色信号それぞれに加え
て輪郭が強調された画像信号を得る方式のものもある．
〈発明が解決しようとする課題〉
ところで、上記従来の輪郭強調装置によると、輪郭強調
のレベルが、輪郭の両側の輝度レベル差に応じて略決定
されることになるため、例えば同じレベル差であっても
色によって輪郭補正のレベルを変化させたいという要求
があっても、これに対応することができなかった。This contour enhancement circuit adds or subtracts, for example, an averaged and blurred sub-signal sampled with an aperture several times larger than the main signal to the main signal, thereby producing an unsharp mask signal ( There is a method that obtains a signal in which the outline of the image is emphasized by obtaining an unsharp mask signal (contour emphasis signal) and adding this unsharp mask signal to the main signal. In addition, the green signal (luminance signal) of the three primary color signals is differentiated to extract the contour signal, and a contour emphasis signal proportional to this is added to each of the original three primary color signals to obtain an image signal in which the contour is emphasized. There are also methods. <Problems to be Solved by the Invention> By the way, according to the above-mentioned conventional edge enhancement device, the level of edge enhancement is approximately determined depending on the difference in brightness level on both sides of the edge. Even if there was a demand for changing the level of contour correction depending on the color, it was not possible to meet this demand.
例えば、被写体が人物であった場合には、肌の部分の輪
郭が強調されると不自然な印象を与えたり、人物が硬い
印象になってしまうことがあり、背景などの鮮鋭さを確
保しつつ、肌の部分の輪郭を和らげた画像を得たい場合
があるが、前述のように従来の輪郭補正装置では色とは
無関係に信号レベル差に基づいて輪郭強調されるために
、背景の鮮鋭さを確保しつつ上記のように肌の部分のみ
の輪郭強調を和らげるといったことができなかったもの
である。For example, if the subject is a person, emphasizing the contours of the skin may give an unnatural impression or make the person look hard, so it is important to ensure the sharpness of the background etc. However, as mentioned above, conventional contour correction devices emphasize contours based on signal level differences, regardless of color, so the sharpness of the background is However, it was not possible to soften the emphasis on the contours of only the skin area as described above while ensuring the same quality.
本発明は上記問題点に鑑みなされたものであり、色の判
別に基づいて輪郭補正レベルを変化させることができる
輪郭補正装置を提供することを目的とする．
〈謀題を解決するための手段〉
そのため本発明では、カラー画像信号の輪郭部分を強調
補正する輪郭強調回路を備えた輪郭強調装置であって、
カラー画像信号に基づき所定色領域に含まれる画像を検
出する所定色検出手段と、この所定色検出手段により所
定色領域に含まれる画像が検出されたときに前記輪郭強
調回路による輪郭強調レベルを可変制御する輪郭強調レ
ベル可変制御手段と、を含んで輪郭強調装置を構或する
ようにした。The present invention has been made in view of the above problems, and an object of the present invention is to provide a contour correction device that can change the contour correction level based on color discrimination. <Means for solving the problem> Therefore, the present invention provides an edge enhancement device including an edge enhancement circuit for emphasizing and correcting the edge portion of a color image signal,
a predetermined color detection means for detecting an image included in a predetermined color area based on a color image signal; and a variable edge enhancement level by the edge enhancement circuit when an image included in the predetermined color area is detected by the predetermined color detection means. The contour enhancement device is configured to include contour enhancement level variable control means for controlling the contour enhancement level.
ここで、カラー画像信号を、明度．彩度，色相に分解さ
れたカラー画像信号とし、所定色検出手段はこの明度，
彩度，色相に基づき画像が所定色領域に含まれることを
検出するよう構或することが好ましい。Here, the color image signal is expressed as brightness. The color image signal is separated into saturation and hue, and the predetermined color detection means detects the brightness and hue.
Preferably, it is configured to detect that an image is included in a predetermined color region based on saturation and hue.
〈作用〉
かかる構或によると、所定色検出手段はカラー画像信号
に基づいて所定色領域に含まれる画像を検出し、前記所
定色領域に含まれる画像が検出されると輪郭強調レベル
可変制御手段が輪郭強調回路による輪郭強調レベルを可
変制御し、前記所定色領域に含まれる画像であるか否か
によって輪郭強調回路による輪郭強調レベルを変化させ
る．また、所定色領域に含まれる画像であるか否かの判
別は、色の３属性である明度（輝度），彩度（飽和度，
色の濃さ），色相（色あい）に分解されたカラー画像信
号を用いれば、あらゆる色が明度，彩度，色相の組み合
わせで表すことができるから、比較的容易に所定色領域
の画像を判別することが可能である。<Operation> According to this structure, the predetermined color detection means detects an image included in a predetermined color area based on the color image signal, and when the image included in the predetermined color area is detected, the edge enhancement level variable control means variably controls the edge enhancement level by the edge enhancement circuit, and changes the edge enhancement level by the edge enhancement circuit depending on whether the image is included in the predetermined color area. In addition, determining whether an image is included in a predetermined color area is based on the three attributes of color: brightness (brightness), saturation (saturation degree,
By using a color image signal separated into color intensity (color intensity) and hue (color tone), any color can be represented by a combination of brightness, saturation, and hue, making it relatively easy to distinguish between images in a given color area. It is possible to do so.
く実施例〉
以下に本発明の実施例を説明する．
一実施例を示す第１図において、輪郭強調補正回路１に
は、カラー画像信号が、明度（輝度）Ｌ．彩度（飽和度
，色の濃さ）Ｃ，色相（色あい）Ｈに分解されて人力す
るようになっている。前記明度．彩度．色相に分解され
たカラー画像信号は、例えば光画像信号をグイクロイッ
クプリズム等によって３原色（Ｒ， Ｇ， Ｂ又はＹ，
Ｍ， Ｃ）に分解した後、３原色それぞれを電気画像
信号に変換し、この３原色電気画像信号を演算やマップ
変換等によって明度Ｌ，彩度Ｃ．色相Ｈに変換して得ら
れる。Examples> Examples of the present invention will be described below. In FIG. 1 showing one embodiment, an edge enhancement correction circuit 1 receives a color image signal with a brightness (brightness) of L. It is separated into chroma (saturation level, color density) C and hue (color tone) H and is done manually. The brightness. saturation. For example, the color image signal separated into hues is divided into three primary colors (R, G, B or Y,
After decomposing into M and C), each of the three primary colors is converted into an electric image signal, and these three primary color electric image signals are converted into lightness L, chroma C. Obtained by converting to hue H.
明度信号（主信号）Ｌはボケ信号（アンシャープ信号）
発生部２に入力され、ここで、入力信号よりも大きなア
バーチャで明度信号Ｌを拾った場合と同等な平均化され
ボケた信号、即ち、ボケ信号（アンシャープ信号）Ｕを
発生させる．（第２図参照）。Brightness signal (main signal) L is blur signal (unsharp signal)
The signal is input to a generating section 2, which generates an averaged and blurred signal, that is, a blurred signal (unsharp signal) U, which is equivalent to the case where the brightness signal L is picked up with a larger aperture than the input signal. (See Figure 2).
ボケ信号発生・部２で発生したボケ信号Ｕは、差信号（
アンシャープマスク信号）発生部３に入力され、ここで
、ボケ信号発生部２を迂回した明度信号と加減算されて
輪郭部分（明度レベルに段差のある部分）のみを強調し
た差信号（アンシャープマスク信号）ＵＳＭを発生させ
る（第２図参照）一方、所定色検出手段及び輪郭強調レ
ベル可変制御手段に相当する強調係数発生部４には、明
度Ｌ，彩度Ｃ，色相Ｈがそれぞれ入力されるようになっ
ており、かかる入力信号に基づいて画像が所定色領域に
含まれるか否かを判別し、差信号発生部３で作威された
差信号（アンシャープマスク信号）ＵＳＭに乗算する係
数Ｋ、即ち、輪郭強調レベルを切り換え設定する。The blur signal U generated in the blur signal generation unit 2 is a difference signal (
The difference signal (unsharp mask signal) is inputted to the unsharp mask signal) generating section 3, where it is added or subtracted with the brightness signal that bypassed the blur signal generating section 2 to emphasize only the contour part (portion with steps in the brightness level). Signal) USM is generated (see Fig. 2).Meanwhile, lightness L, saturation C, and hue H are inputted to the emphasis coefficient generating section 4, which corresponds to a predetermined color detection means and an edge emphasis level variable control means, respectively. Based on the input signal, it is determined whether the image is included in a predetermined color area or not, and a coefficient is multiplied by the difference signal (unsharp mask signal) USM generated by the difference signal generator 3. K, that is, the edge enhancement level is switched and set.
本実施例では、背景の鮮鋭さを確保する輪郭強調を実施
しつつ、人物の肌色部分については輪郭強調レベルを弱
め、肌の部分が自然な印象の画像を得るために、肌色領
域に含まれる画像であるか否かによって前記強調係数Ｋ
を切り換え設定する。In this example, while performing contour enhancement to ensure the sharpness of the background, the contour enhancement level is weakened for the skin-colored portion of the person, and in order to obtain an image with a natural impression, the skin portion is included in the skin-colored area. The emphasis coefficient K is determined depending on whether the image is an image or not.
Switch and set.
そのため、前記強調係数発生部４では、入力した明度Ｌ
．彩度Ｃ．色相Ｈに基づき、予め前記明度Ｌ，彩度Ｃ．
色相Ｈそれぞれのレベル範囲に応じて設定されている肌
色領域（第３図の斜線領域）に画像の色が含まれるか否
かを判別し、画像が所定の肌色領域に含まれるときには
、肌色領域以外のときに比べ前記強調係数Ｋを小さくす
ることにより、肌色の部分のみが他の部分に比べ軽度に
輪郭強調されるようにする。これにより、輪郭補正する
画像が人物画像であるときに、肌色の部分が必要以上に
強く輪郭補正されて不自然な画像となることを防止しつ
つ、他の部分については輪郭強調により鮮鋭さを向上さ
せることができる。Therefore, in the emphasis coefficient generating section 4, the input lightness L
．． Saturation C. Based on the hue H, the lightness L, chroma C.
It is determined whether the color of the image is included in the skin color area (the shaded area in Figure 3) set according to the level range of each hue H, and if the image is included in the predetermined skin color area, the skin color area is By making the enhancement coefficient K smaller than in other cases, only the skin-colored portion is lightly emphasized in outline compared to other portions. As a result, when the image to be contour-corrected is a human image, it is possible to prevent skin-colored areas from being contour-corrected more strongly than necessary, resulting in an unnatural image, while enhancing the sharpness of other areas by enhancing the contours. can be improved.
強調係数発生部４で、画像が肌色領域に含まれるか否か
によって強調係数Ｋが大小に切り換えられて設定される
と、乗算器５では差信号発生部３で発生した差信号（ア
ンシャープマスク信号）ＵＳＭを前記強調係数Ｋで乗算
して強調レベルの設定を行い、明度信号Ｌのレベル差及
び強調係数Ｋに応じて輪郭部分のみ強調された差信号Ｕ
ＳＭ （輪郭強調信号）を．発生させる。When the emphasis coefficient generator 4 switches the emphasis coefficient K to be large or small depending on whether the image is included in the skin color area or not, the multiplier 5 converts the difference signal (unsharp mask) generated by the difference signal generator 3 into Signal) USM is multiplied by the emphasis coefficient K to set the emphasis level, and a difference signal U is obtained in which only the outline part is emphasized according to the level difference of the brightness signal L and the emphasis coefficient K.
SM (contour emphasis signal). generate.
そして、輪郭強調部６では、前記乗算器５で強調係数Ｋ
を乗算して最終設定された差信号ＵＳＭを、ボケ信号発
生部２及び差信号発生部３を迂回した明度信号Ｌに加算
して、入力された明度信号Ｌの段差部（輪郭部分）のみ
を強調した信号Ｌ゜として出力する（第２図参照），
次に上記第ｌ図のブロック図に示すハードウェア構戒に
従って行われる輪郭補正の制御内容を、第２図を参照し
つつ第４図のフローチャートに従って簡潔に説明する．
まず、入力された明度信号Ｌから平均化してボケたボケ
信号Ｕを発生させ（Ｓｌ）、このボケ信号Ｕと前記明度
信号Ｌとを加減算することで画像の輪郭部分のみが強調
された差信号（アンシャープ信号）ＵＳＭを得る（Ｓ２
）。そして、入力した明度Ｌ，彩度Ｃ．色相Ｈに基づき
画像が予め設定された肌色領域に含まれるか否かを判別
し（Ｓ３）、肌色領域であるときには強調係数Ｋに所定
値Ｋ１をセットし（３４）、肌色領域でないときには前
記所定値Ｋ，よりも大である所定値Ｋ２を強調係数Ｋに
セットする（Ｓ５）。前記強調係数゛Ｋは、大きいほど
輪郭強調レベルが高められるから、上記強調係数Ｋの設
定制御により、肌色領域では輪郭強調レベルが弱められ
る。Then, in the contour emphasizing section 6, the multiplier 5 uses an emphasizing coefficient K.
The difference signal USM, which is finally set by multiplying by Output as an emphasized signal L° (see Figure 2) Next, Figure 4 shows the details of the contour correction control performed according to the hardware configuration shown in the block diagram of Figure 1 above, with reference to Figure 2. This will be briefly explained according to the flowchart. First, the input brightness signal L is averaged to generate a blurred blur signal U (Sl), and by adding and subtracting this blur signal U and the brightness signal L, a difference signal is generated in which only the outline of the image is emphasized. (Unsharp signal) Obtain USM (S2
). Then, the input brightness L, chroma C. It is determined whether the image is included in a preset skin color area based on the hue H (S3), and if it is in the skin color area, a predetermined value K1 is set to the emphasis coefficient K (34), and if it is not in the skin color area, the predetermined value K1 is set. A predetermined value K2, which is larger than the value K, is set as the emphasis coefficient K (S5). Since the larger the emphasis coefficient 'K' is, the higher the outline emphasis level is, by controlling the setting of the emphasis coefficient K, the outline emphasis level is weakened in the skin color area.
そして、前記のようにして画像が肌色領域に含まれるか
否かによって切り換え設定された強調係数Ｋを用い、差
信号（アンシャープ信号）ＵＳＭのレベル調整を行い（
Ｓ６）、強調係数Ｋを乗算してレベル調整された差信号
（アンシャープ信号）ＵＳＭを元の明度信号Ｌ（主信号
）に加算することで、明度信号Ｌに基づく輪郭部分のみ
を強調補正して出力する（Ｓ７）。Then, the level of the difference signal (unsharp signal) USM is adjusted using the emphasis coefficient K, which is switched and set depending on whether the image is included in the skin color area as described above.
S6) By adding the level-adjusted difference signal (unsharp signal) USM multiplied by the emphasis coefficient K to the original brightness signal L (main signal), only the contour portion based on the brightness signal L is emphasized and corrected. and output it (S7).
尚、本実施例では、画像が肌色領域に含まれるか否かに
よって強調レベルを切り換えるようにしたが、所定色領
域は肌色領域に限るものではなく、また、複数種の色領
域（明度，彩度及び色相によって区分される）及びこれ
に対応する輪郭強調レベルを設定し、強調レベルを３種
類以上に切り換えるようにしても良い。In this embodiment, the emphasis level is switched depending on whether the image is included in the skin color area, but the predetermined color area is not limited to the skin color area, and may include multiple types of color areas (brightness, chroma). It is also possible to set the contour enhancement level corresponding to the intensity and hue) and switch the enhancement level to three or more types.
また、所定色領域における強調レベルの可変制御を、外
部操作スイッチにより選択できるようにして、色とは無
関係に行われる輪郭強調と所定色領域に限った輪郭補正
レベルの可変制御とが任意に切り換えられるようにして
も良く、更には、輪郭補正における強調レベルを可変制
御する所定色領域を外部操作によって切り換えられるよ
うにすることも可能である。In addition, variable control of the emphasis level in a predetermined color area can be selected using an external operation switch, so that it is possible to arbitrarily switch between contour enhancement performed independently of color and variable control of the contour correction level limited to a predetermined color area. Furthermore, it is also possible to make it possible to change the predetermined color area in which the emphasis level in contour correction is variably controlled by an external operation.
更に、本実施例では、ボケ信号と元の信号（輝度信号）
との加減算によってアンシャープマスク信号（輪郭強調
信号）を得る方式の輪郭強調回路を用いたが、かかる方
式の他、輝度信号を微分して輪郭信号を抽出し、これに
比例した輪郭強調信号を作戒する方式のものであっても
良く、輪郭補正の方式を限定するものではない．
〈発明の効果〉
以上説明したように、本発明によると、所定色領域に含
まれる画像が検出されたときに輪郭強調回路による輪郭
強調レベルを可変制御するようにしたので、例えば人物
画像において肌色領域のみの輪郭強調レベルを弱め、画
像全体としては鮮鋭さを確保しつつ肌色が自然な印象の
画像を得ることができる．また、カラー画像信号から所
定色領域に含まれる画像を検出するに当たっては、明度
，彩度，色相に分解されたカラー画像信号を用いれば、
全ての色がこれらの３属性によって表されるから容易に
所定色領域を検出することができる。Furthermore, in this example, the blur signal and the original signal (luminance signal)
We used an edge enhancement circuit that obtains an unsharp mask signal (edge enhancement signal) by adding and subtracting the signal from It may be a method of discipline, and the method of contour correction is not limited. <Effects of the Invention> As explained above, according to the present invention, when an image included in a predetermined color area is detected, the contour enhancement level by the contour enhancement circuit is variably controlled. By weakening the edge enhancement level of only the area, it is possible to obtain an image with natural skin tones while ensuring the sharpness of the entire image. In addition, when detecting an image included in a predetermined color area from a color image signal, if a color image signal separated into brightness, saturation, and hue is used,
Since all colors are represented by these three attributes, a predetermined color area can be easily detected.
第１図は本発明の一実施例を示すブロック図、第２図は
同上実施例における輪郭補正制御の特性を示すタイムチ
ャート、第３図は同上実施例における所定色領域を示す
図、第４図は同上実施例における輪郭補正の制御内容を
示すフローチャートである。FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a time chart showing the characteristics of contour correction control in the above embodiment, FIG. 3 is a diagram showing a predetermined color area in the above embodiment, and FIG. The figure is a flowchart showing the details of contour correction control in the embodiment.
Claims (2)
調回路を備えた輪郭強調装置であって、前記カラー画像
信号に基づき所定色領域に含まれる画像を検出する所定
色検出手段と、 該所定色検出手段により前記所定色領域に含まれる画像
が検出されたときに前記輪郭強調回路による輪郭強調レ
ベルを可変制御する輪郭強調レベル可変制御手段と、 を含んで構成したことを特徴とする輪郭強調装置。(1) An edge enhancement device including an edge enhancement circuit that emphasizes and corrects an edge portion of a color image signal, comprising a predetermined color detection means for detecting an image included in a predetermined color region based on the color image signal; Edge enhancement level variable control means for variably controlling the edge enhancement level by the edge enhancement circuit when an image included in the predetermined color area is detected by the color detection means; Device.
されたカラー画像信号であることを特徴とする請求項１
記載の輪郭強調装置。(2) Claim 1, wherein the color image signal is a color image signal separated into brightness, saturation, and hue.
The contour enhancement device described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1228215A JPH0392087A (en) | 1989-09-05 | 1989-09-05 | Contour emphasis device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1228215A JPH0392087A (en) | 1989-09-05 | 1989-09-05 | Contour emphasis device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0392087A true JPH0392087A (en) | 1991-04-17 |
Family
ID=16872988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1228215A Pending JPH0392087A (en) | 1989-09-05 | 1989-09-05 | Contour emphasis device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0392087A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0552016A2 (en) * | 1992-01-13 | 1993-07-21 | Mitsubishi Denki Kabushiki Kaisha | Video signal processor and color video camera |
| US5638136A (en) * | 1992-01-13 | 1997-06-10 | Mitsubishi Denki Kabushiki Kaisha | Method and apparatus for detecting flesh tones in an image |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5680976A (en) * | 1979-12-06 | 1981-07-02 | Matsushita Electric Ind Co Ltd | Picture-quality improving device of color television receiver |
| JPS6399690A (en) * | 1986-10-15 | 1988-04-30 | Sharp Corp | Color picture signal conversion system |
-
1989
- 1989-09-05 JP JP1228215A patent/JPH0392087A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5680976A (en) * | 1979-12-06 | 1981-07-02 | Matsushita Electric Ind Co Ltd | Picture-quality improving device of color television receiver |
| JPS6399690A (en) * | 1986-10-15 | 1988-04-30 | Sharp Corp | Color picture signal conversion system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0552016A2 (en) * | 1992-01-13 | 1993-07-21 | Mitsubishi Denki Kabushiki Kaisha | Video signal processor and color video camera |
| EP0552016A3 (en) * | 1992-01-13 | 1995-07-26 | Mitsubishi Electric Corp | |
| US5488429A (en) * | 1992-01-13 | 1996-01-30 | Mitsubishi Denki Kabushiki Kaisha | Video signal processor for detecting flesh tones in am image |
| US5561474A (en) * | 1992-01-13 | 1996-10-01 | Mitsubishi Denki Kabushiki Kaisha | Superimposing circuit performing superimposing based on a color saturation level determined from color difference signals |
| US5638136A (en) * | 1992-01-13 | 1997-06-10 | Mitsubishi Denki Kabushiki Kaisha | Method and apparatus for detecting flesh tones in an image |
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