JPH0646293A - Contour correction device - Google Patents
Contour correction deviceInfo
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- JPH0646293A JPH0646293A JP4216489A JP21648992A JPH0646293A JP H0646293 A JPH0646293 A JP H0646293A JP 4216489 A JP4216489 A JP 4216489A JP 21648992 A JP21648992 A JP 21648992A JP H0646293 A JPH0646293 A JP H0646293A
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- Prior art keywords
- contour
- correction
- level
- video signal
- signal
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、輪郭補正装置に係り、
詳細には、入力映像信号の輪郭補正により出力映像信号
の高画質化を図る輪郭補正装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contour correcting device,
More specifically, the present invention relates to a contour correction device that improves the quality of an output video signal by correcting the contour of an input video signal.
【０００２】[0002]
【従来の技術】従来のテレビ受像機において、映像信号
をディスプレイで見る場合、ディスプレイまでに各回路
で処理される映像信号の周波数特性劣化の改善及び視覚
上の画質を向上させるため、ディスプレイに入力される
映像信号（輝度信号）の高周波成分を抽出し、その高周
波成分を入力映像信号に加算し、加算した映像信号のエ
ッジ部の立ち上がり、立ち下がりを急峻にする輪郭補正
処理を輪郭補正回路により行っている。2. Description of the Related Art In a conventional television receiver, when a video signal is viewed on a display, it is input to the display in order to improve the deterioration of frequency characteristics of the video signal processed by each circuit and improve visual image quality. A high-frequency component of the video signal (luminance signal) to be extracted is extracted, the high-frequency component is added to the input video signal, and the edge correction circuit performs edge correction processing that makes the rising and falling edges of the added video signal steep. Is going.
【０００３】この従来の輪郭補正回路を図５に示して説
明する。This conventional contour correction circuit will be described with reference to FIG.
【０００４】図５において、輪郭補正回路１は、映像信
号（輝度信号）の高周波成分（輪郭成分）を抽出し、そ
の高周波成分をコアリング３に出力するバンドパスフィ
ルタ（Ｂ・Ｐ・Ｆ）２と、バンドパスフィルタ２により
抽出された高周波成分のレベルに応じて該高周波成分を
加算器４に出力するコアリング３と、元の入力映像信号
にコアリング３から入力される高周波成分を加算して出
力する加算器４とから構成されている。In FIG. 5, a contour correction circuit 1 extracts a high frequency component (contour component) of a video signal (luminance signal) and outputs the high frequency component to a core ring 3 (B / P / F). 2, a coring 3 that outputs the high frequency component to the adder 4 according to the level of the high frequency component extracted by the bandpass filter 2, and a high frequency component that is input from the core ring 3 to the original input video signal. And an adder 4 for outputting.
【０００５】この輪郭補正回路１の図中ａ、ｂ、ｃで示
す部分における各信号波形の様子を図６（ａ）〜（ｃ）
に示す。図６において、（ａ）は、図５のａ部分の入力
映像信号波形を示し、（ｂ）は、図５のｂ部分の高周波
成分を出力した場合を示し、（ｃ）は、図５のｃ部分の
加算後の映像信号波形を示している。The state of each signal waveform in the portions indicated by a, b and c in the contour correction circuit 1 is shown in FIGS. 6 (a) to 6 (c).
Shown in. 6, (a) shows the input video signal waveform of the portion a of FIG. 5, (b) shows the case where the high frequency component of the portion b of FIG. 5 is output, and (c) of FIG. The video signal waveform after addition of the c portion is shown.
【０００６】このように入力映像信号に強調信号（高周
波成分）を加算してディスプレイに出力することによ
り、ディスプレイに表示される映像の輪郭が強調され、
視覚上の画質を向上させることができる。このような輪
郭補正回路１においては、入力映像信号に含まれるノイ
ズ成分等のレベルの小さい高周波成分の強調を避けるた
め、コアリング３により一定レベル以下の高周波成分に
対しては、ゲインを“０”として輪郭強調を避け、一定
レベル以上の高周波成分に対しては、ゲインを“１”と
して輪郭強調を行うようにしている。By thus adding the emphasis signal (high-frequency component) to the input video signal and outputting it to the display, the contour of the video displayed on the display is emphasized,
The visual image quality can be improved. In such a contour correction circuit 1, in order to avoid emphasizing a high-frequency component having a low level such as a noise component included in the input video signal, the coring 3 causes the gain to be “0” for a high-frequency component below a certain level. The contour enhancement is avoided as "", and the contour enhancement is performed with the gain "1" for high frequency components of a certain level or higher.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、このよ
うな上記従来の輪郭補正回路にあっては、コアリングに
より一定レベル以下の高周波成分に対しては、ゲインを
“０”として輪郭強調を避け、一定レベル以上の高周波
成分に対しては、ゲインを“１”として輪郭強調を行
い、この輪郭強調信号を入力画像信号に加算する構成と
なっていたため、一定レベルに近い高周波成分に対して
は、輪郭強調が行われる部分と、輪郭強調が行われない
部分とが発生し、表示される画像が不自然なものとな
り、また、輪郭強調された出力画像信号が、上記図６
（ｃ）に示すように、黒側にアンダーシュートが発生す
るとともに、白側にオーバーシュートが発生し、入力画
像信号よりも白レベル又は黒レベルに近くなり、表示さ
れる画像のエッジ部の白側に白い帯が発生したり、黒側
に黒い帯が発生し、画質を劣化させるという問題点があ
った。However, in such a conventional contour correction circuit as described above, for high frequency components below a certain level due to coring, the gain is set to "0" to avoid contour enhancement. For high frequency components above a certain level, the contour is emphasized with a gain of "1", and the contour enhancement signal is added to the input image signal. Therefore, for high frequency components near a certain level, A part where contour enhancement is performed and a part where contour enhancement is not performed occur, which causes an unnatural image to be displayed, and the output image signal subjected to contour enhancement is the above-mentioned FIG.
As shown in (c), undershoot occurs on the black side and overshoot occurs on the white side, and the white level is closer to the white level or the black level than the input image signal. There is a problem that a white band is generated on the side and a black band is generated on the black side, which deteriorates the image quality.
【０００８】また、全ての一定レベル以上の高周波成分
が一様に輪郭強調されるため、コアリングにより除去で
きない高周波数や低レベルの高周波成分までも一様に輪
郭強調されると、表示画像に不要なチラツキが発生し、
画質を劣化させる原因となっていた。Further, since all high-frequency components of a certain level or higher are uniformly edge-enhanced, if even high-frequency components or low-level high-frequency components that cannot be removed by coring are evenly edge-enhanced, a display image is displayed. Unnecessary flickering occurs,
It was a cause of deterioration of image quality.
【０００９】そこで本発明は、輝度信号から抽出する輪
郭成分のレベルに応じて適切に輪郭補正量を設定する輪
郭補正装置を提供することを目的とする。SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a contour correction device that appropriately sets a contour correction amount according to the level of a contour component extracted from a luminance signal.
【００１０】[0010]
【課題を解決するための手段】入力される輝度信号の輪
郭成分を抽出する輪郭抽出手段と、前記輪郭抽出手段に
より抽出された輪郭成分のレベルに基づいて該輪郭成分
を強調する強調手段と、前記強調手段により強調された
輪郭成分の過強調された部分を補正する過強調補正手段
と、前記入力輝度信号と前記過強調補正手段により過強
調部分が補正された強調信号を合成して出力する合成手
段と、を具備したことを特徴としている。A contour extracting means for extracting a contour component of an input luminance signal, and an emphasizing means for emphasizing the contour component based on a level of the contour component extracted by the contour extracting means, An over-emphasizing correction means for correcting the over-emphasized portion of the contour component emphasized by the emphasizing means, and the input luminance signal and the emphasis signal in which the over-emphasized portion is corrected by the over-emphasizing correction means are combined and output. And a synthesizing means.
【００１１】また、請求項１記載の前記強調手段は、前
記輪郭抽出手段により抽出された輪郭成分のレベルの増
加に応じて補正量が増加するように非線形補正を行うと
ともに、前記過強調補正手段は、前記入力輝度信号レベ
ルが黒レベル及び白レベルに至る区間は補正量が逓減
し、該黒レベルと白レベルの間の区間は補正量が一定と
なるように非線形補正を行うことを特徴としている。Further, the emphasizing means according to claim 1 performs the non-linear correction so that the correction amount increases in accordance with the increase of the level of the contour component extracted by the contour extracting means, and the over-emphasizing correction means. Is characterized by performing a non-linear correction such that the correction amount gradually decreases in the section where the input luminance signal level reaches the black level and the white level, and the correction amount becomes constant in the section between the black level and the white level. There is.
【００１２】[0012]
【作用】本発明は、輪郭抽出手段により入力される輝度
信号から輪郭成分が抽出され、該抽出された輪郭成分の
レベルに基づいて強調手段により該輪郭成分が強調され
るとともに、該強調された輪郭成分の過強調部分が過強
調補正手段により補正され、入力輝度信号と過強調部分
が補正された強調信号が合成手段により合成されて出力
される。また、強調手段では、抽出された輪郭成分のレ
ベルの増加に応じて補正量が増加するように非線形補正
が行われ、過強調補正手段では、入力輝度信号レベルが
黒レベル及び白レベルに至る区間は補正量が逓減され、
該黒レベルと白レベルの間の区間は補正量が一定となる
ように非線形補正が行れる。According to the present invention, the contour component is extracted from the luminance signal input by the contour extracting means, the contour component is emphasized by the emphasizing means based on the level of the extracted contour component, and the contour component is emphasized. The over-emphasized portion of the contour component is corrected by the over-emphasized correcting means, and the input luminance signal and the emphasized signal obtained by correcting the over-emphasized portion are combined and output by the combining means. Further, the emphasis means performs a non-linear correction so that the correction amount increases in accordance with an increase in the level of the extracted contour component, and the over-emphasis correction means performs a section in which the input luminance signal level reaches the black level and the white level. Correction amount is gradually reduced,
Non-linear correction is performed so that the correction amount becomes constant in the section between the black level and the white level.
【００１３】したがって、入力輝度信号の輪郭成分のレ
ベルに応じて適切に輪郭強調を行うことができ、表示画
像の画質を向上させることができる。Therefore, the contour enhancement can be appropriately performed according to the level of the contour component of the input luminance signal, and the quality of the display image can be improved.
【００１４】[0014]
【実施例】以下、図１〜図４を参照して実施例を説明す
る。EXAMPLES Examples will be described below with reference to FIGS.
【００１５】図１〜図４は、本発明の輪郭補正装置の一
実施例を示す図である。1 to 4 are views showing an embodiment of the contour correcting apparatus of the present invention.
【００１６】まず、構成を説明する。図１は、輪郭補正
装置１０のブロック構成図である。この図において、輪
郭補正装置１０は、水平バンドパスフィルタ１１、垂直
バンドパスフィルタ１２、加算器１３、絶対値アンプ１
４、非線形処理回路１５、１６、乗算器１７、１８及び
加算器１９により構成される。First, the structure will be described. FIG. 1 is a block diagram of the contour correction apparatus 10. In this figure, a contour correction device 10 includes a horizontal bandpass filter 11, a vertical bandpass filter 12, an adder 13, and an absolute value amplifier 1.
4, non-linear processing circuits 15 and 16, multipliers 17 and 18, and an adder 19.
【００１７】水平バンドパスフィルタ１１は、入力され
る映像信号（輝度信号）ａから水平方向の高周波成分を
抽出して加算器１３に出力し、垂直バンドパスフィルタ
１２は、入力される映像信号（輝度信号）から垂直方向
の高周波成分を抽出して加算器１３に出力する。加算器
１３は、水平バンドパスフィルタ１１から入力される水
平方向の高周波成分と垂直バンドパスフィルタ１２から
入力される垂直方向の高周波成分を加算し、その加算結
果を絶対値アンプ１４と乗算器１７に出力する。The horizontal bandpass filter 11 extracts a high frequency component in the horizontal direction from the input video signal (luminance signal) a and outputs it to the adder 13, and the vertical bandpass filter 12 receives the input video signal ( A high frequency component in the vertical direction is extracted from the luminance signal) and output to the adder 13. The adder 13 adds the high frequency component in the horizontal direction input from the horizontal band pass filter 11 and the high frequency component in the vertical direction input from the vertical band pass filter 12, and adds the addition result to the absolute value amplifier 14 and the multiplier 17. Output to.
【００１８】絶対値アンプ１４は、加算器１３から入力
される加算結果である高周波成分ｂ（便宜上ｘとする）
の絶対値｜ｘ｜を求めて非線形処理回路１５に出力す
る。非線形処理回路１５は、絶対値アンプ１４から入力
される絶対値｜ｘ｜に基づいて、図２に示す特性を持
つ、すなわち、絶対値｜ｘ｜の増加とともにその値が増
加する補正係数αを選択して乗算器１７に出力する。非
線形処理回路１６は、入力される映像信号（輝度信号）
ａ（便宜上ｙとする）のレベル変化に基づいて、図３に
示す特性を持つ、すなわち、輝度信号ｙのレベルが黒レ
ベル及び白レベルに至る区間ではその値が逓減し、黒レ
ベルと白レベルの間の区間では値が一定となる補正係数
βを選択して乗算器１８に出力する。The absolute value amplifier 14 is a high-frequency component b (x for convenience) which is the addition result input from the adder 13.
The absolute value | x | of is calculated and output to the non-linear processing circuit 15. The non-linear processing circuit 15 has the characteristic shown in FIG. 2 based on the absolute value | x | input from the absolute value amplifier 14, that is, the correction coefficient α that increases as the absolute value | x | increases. It is selected and output to the multiplier 17. The non-linear processing circuit 16 receives an input video signal (luminance signal)
Based on the level change of a (referred to as y for convenience), it has the characteristic shown in FIG. 3, that is, the value gradually decreases in the section where the level of the luminance signal y reaches the black level and the white level, and the black level and the white level are The correction coefficient β having a constant value in the interval between is selected and output to the multiplier 18.
【００１９】乗算器１７は、加算器１３から入力される
水平・垂直方向の高周波成分の加算結果ｂに非線形処理
回路１５から入力される補正係数αを乗算し、その乗算
結果ｃを乗算器１８に出力する。乗算器１８は、乗算器
１７から入力される乗算結果ｃに非線形処理回路１６か
ら入力される補正係数βを乗算し、その乗算結果、すな
わち輪郭を強調する強調信号ｄを加算器１９に出力す
る。加算器１９は、入力映像信号に乗算器１８から入力
される強調信号ｄを加算し、その加算結果を出力映像信
号として出力する。The multiplier 17 multiplies the addition result b of the high frequency components in the horizontal and vertical directions input from the adder 13 by the correction coefficient α input from the non-linear processing circuit 15, and the multiplication result c is multiplied by the multiplier 18. Output to. The multiplier 18 multiplies the multiplication result c input from the multiplier 17 by the correction coefficient β input from the non-linear processing circuit 16, and outputs the multiplication result, that is, the enhancement signal d for enhancing the contour, to the adder 19. . The adder 19 adds the enhancement signal d input from the multiplier 18 to the input video signal, and outputs the addition result as an output video signal.
【００２０】なお、上記絶対値アンプ１４及び非線形回
路１５は、上記従来の輪郭補正回路１におけるコアリン
グ３に相当する。The absolute value amplifier 14 and the non-linear circuit 15 correspond to the core ring 3 in the conventional contour correction circuit 1.
【００２１】次に、本実施例の動作を説明する。Next, the operation of this embodiment will be described.
【００２２】本実施例では、輪郭補正装置１０に、例え
ば、図４（ａ）に示すような映像信号ａ（輝度信号）が
入力されると、この入力映像信号ａは、水平バンドパス
フィルタ１１、垂直バンドパスフィルタ１２、非線形処
理回路１６及び加算器１９に入力され、この入力映像信
号ａから水平バンドパスフィルタ１１及び垂直バンドパ
スフィルタ１２により水平方向と垂直方向の高周波成分
が抽出され、抽出された水平方向と垂直方向の高周波成
分が加算器１３により加算され、図４（ｂ）に示すよう
な加算結果ｂが得られる。In this embodiment, when a video signal a (luminance signal) as shown in FIG. 4A is input to the contour correction device 10, the input video signal a is input to the horizontal bandpass filter 11. , The vertical bandpass filter 12, the non-linear processing circuit 16, and the adder 19, and the horizontal bandpass filter 11 and the vertical bandpass filter 12 extract high-frequency components in the horizontal direction and the vertical direction from the input video signal a, and extract them. The added horizontal and vertical high frequency components are added by the adder 13, and an addition result b as shown in FIG. 4B is obtained.
【００２３】この加算結果ｂから絶対値アンプ１４によ
り絶対値｜ｘ｜が求められ、求められた絶対値｜ｘ｜に
基づいて非線形処理回路１５により上記図２に示した補
正係数αが選択されて乗算器１７に出力される。また、
非線形処理回路１６に入力された映像信号ｙは、この映
像信号ｙのレベル変化に基づいて上記図３に示した補正
係数βが選択されて乗算器１８に出力される。From the addition result b, the absolute value | x | is obtained by the absolute value amplifier 14, and the correction coefficient α shown in FIG. 2 is selected by the non-linear processing circuit 15 based on the obtained absolute value | x |. And is output to the multiplier 17. Also,
For the video signal y input to the non-linear processing circuit 16, the correction coefficient β shown in FIG. 3 is selected based on the level change of the video signal y and output to the multiplier 18.
【００２４】加算結果ｂと補正係数αは、乗算器１７で
乗算され、その乗算結果ｃと補正係数βが乗算器１８で
乗算され、すなわち強調信号ｄが得られる。この強調信
号ｄは、加算器１９により入力映像信号ａに加算され、
図４（ｃ）に示すように輪郭補正された出力映像信号と
して図外のブラウン管に出力される。The addition result b and the correction coefficient α are multiplied by the multiplier 17, and the multiplication result c and the correction coefficient β are multiplied by the multiplier 18, that is, the emphasis signal d is obtained. This emphasized signal d is added to the input video signal a by the adder 19,
As shown in FIG. 4C, the output image signal whose contour has been corrected is output to a cathode ray tube (not shown).
【００２５】したがって、入力映像信号から抽出した高
周波成分を非線形処理回路１５により抽出した高周波成
分の増加に応じた補正係数αを乗算して補正するととも
に、入力映像信号の黒レベル、白レベル及び中間レベル
に応じた補正係数βを乗算して補正して強調信号を作成
することにより、上記従来の図６（ｃ）に示した輪郭強
調された映像信号のように黒側のアンダーシュート、白
側のオーバーシュートのない図４（ｃ）に示すような輪
郭強調された映像信号を作成することができ、また、不
要な高周波成分まで輪郭強調することを避けて、表示画
像に不要なチラツキが発生することを防止して、表示画
像の画質を向上させることができる。Therefore, the high frequency component extracted from the input video signal is multiplied by the correction coefficient α according to the increase of the high frequency component extracted by the non-linear processing circuit 15 to be corrected, and the black level, the white level and the intermediate level of the input video signal are corrected. The correction coefficient β corresponding to the level is multiplied and corrected to create an enhancement signal, so that the undershoot on the black side and the white side on the white side as in the conventional edge-enhanced video signal shown in FIG. 4C, it is possible to create a video signal with contour enhancement as shown in FIG. 4C, and avoid unnecessary enhancement of contours even in unnecessary high-frequency components to cause unnecessary flicker in the display image. This can be prevented and the quality of the displayed image can be improved.
【００２６】以上説明したように、輪郭補正装置１０
が、水平バンドパスフィルタ１１、垂直バンドパスフィ
ルタ１２により入力映像信号から水平・垂直方向の高周
波成分を抽出し、この水平・垂直高周波成分を加算器１
３で加算し、絶対値アンプ１４で加算結果から絶対値｜
ｘ｜を求め、非線形処理回路１５で絶対値｜ｘ｜、つま
り、高周波成分のレベルに基づいて補正係数αを選択
し、乗算器１７で高周波成分に補正係数αを乗算するこ
とにより高周波成分のレベルに応じた自然な輪郭強調成
分を出力できる。また、非線形処理回路１６は、映像信
号のレベル変化に基づいて補正係数βを選択し、乗算器
１８で輪郭強調成分に補正係数βを乗算することにより
過強調成分を補正できる。この補正した輪郭強調信号を
加算器１９で入力映像信号に加算することにより、入力
輝度信号から抽出する輪郭成分のレベルに応じて適切に
輪郭強調する強調信号を入力映像信号に加算することが
でき、表示画像の画質を向上させることができる。As described above, the contour correction device 10
However, the horizontal bandpass filter 11 and the vertical bandpass filter 12 extract high frequency components in the horizontal and vertical directions from the input video signal, and add the horizontal and vertical high frequency components.
The absolute value is added by 3 and the absolute value amplifier 14 calculates the absolute value |
x | is found, the nonlinear processing circuit 15 selects the correction coefficient α based on the absolute value | x |, that is, the level of the high frequency component, and the multiplier 17 multiplies the high frequency component by the correction coefficient α to obtain the high frequency component. It is possible to output a natural contour enhancement component according to the level. Further, the non-linear processing circuit 16 can correct the over-emphasized component by selecting the correction factor β based on the level change of the video signal and multiplying the contour emphasis component by the correction factor β in the multiplier 18. By adding the corrected contour emphasis signal to the input video signal by the adder 19, it is possible to add to the input video signal an emphasis signal that appropriately emphasizes the contour according to the level of the contour component extracted from the input luminance signal. The quality of the displayed image can be improved.
【００２７】[0027]
【発明の効果】本発明によれば、入力される輝度信号か
ら輪郭成分を抽出し、該抽出した輪郭成分のレベルに基
づいて強調手段により該輪郭成分を強調するとともに、
該強調された輪郭成分の過強調部分を過強調補正手段に
より補正し、入力輝度信号と過強調部分が補正された強
調信号を合成手段により合成して出力される。また、強
調手段では、抽出された輪郭成分のレベルの増加に応じ
て補正量を増加するように非線形補正を行い、過強調補
正手段では、入力輝度信号レベルが黒レベル及び白レベ
ルに至る区間は補正量が逓減し、該黒レベルと白レベル
の間の区間は補正量が一定となるように非線形補正を行
う構成としているので、入力輝度信号の輪郭成分のレベ
ルに応じて適切に輪郭強調を行うことができ、表示画像
の画質を向上させることができる。According to the present invention, the contour component is extracted from the input luminance signal, and the contour component is emphasized by the emphasizing means based on the level of the extracted contour component.
The overemphasized portion of the emphasized contour component is corrected by the overemphasized correction means, and the input luminance signal and the emphasized signal with the overemphasized portion corrected are combined by the combining means and output. Further, the emphasis means performs non-linear correction so as to increase the correction amount in accordance with the increase in the level of the extracted contour component, and the over-emphasizing correction means performs the section where the input luminance signal level reaches the black level and the white level. Since the amount of correction gradually decreases, and the non-linear correction is performed so that the amount of correction becomes constant in the section between the black level and the white level, contour enhancement is appropriately performed according to the level of the contour component of the input luminance signal. It is possible to improve the quality of the displayed image.
【図１】本発明の輪郭補正装置のブロック構成図。FIG. 1 is a block configuration diagram of a contour correction device of the present invention.
【図２】図１の非線形処理回路により処理される補正係
数αの特性を示す図。FIG. 2 is a diagram showing characteristics of a correction coefficient α processed by a nonlinear processing circuit of FIG.
【図３】図１の非線形処理回路により処理される補正係
数βの特性を示す図。FIG. 3 is a diagram showing characteristics of a correction coefficient β processed by the nonlinear processing circuit of FIG. 1.
【図４】図１の輪郭補正装置の各部における信号波形を
示す図。FIG. 4 is a diagram showing a signal waveform in each part of the contour correction apparatus of FIG.
【図５】従来の輪郭補正回路の回路構成図。FIG. 5 is a circuit configuration diagram of a conventional contour correction circuit.
【図６】図５の輪郭補正回路の各部における信号波形を
示す図。6 is a diagram showing a signal waveform in each part of the contour correction circuit in FIG.
１０ 輪郭補正装置 １１ 水平バンドパスフィルタ １２ 垂直バンドパスフィルタ １３、１９ 加算器 １４ 絶対値アンプ １５、１６ 非線形処理回路 １７、１８ 乗算器 10 Contour Correction Device 11 Horizontal Bandpass Filter 12 Vertical Bandpass Filter 13, 19 Adder 14 Absolute Value Amplifier 15, 16 Nonlinear Processing Circuit 17, 18 Multiplier
Claims (3)
る輪郭抽出手段と、 前記輪郭抽出手段により抽出された輪郭成分のレベルに
基づいて該輪郭成分を強調する強調手段と、 前記強調手段により強調された輪郭成分の過強調された
部分を補正する過強調補正手段と、 前記入力輝度信号と前記過強調補正手段により過強調部
分が補正された強調信号を合成して出力する合成手段
と、 を具備したことを特徴とする輪郭補正装置。1. A contour extracting unit for extracting a contour component of an input luminance signal, an emphasizing unit for emphasizing the contour component based on a level of the contour component extracted by the contour extracting unit, and the emphasizing unit. An over-emphasizing correction means for correcting the over-emphasized portion of the emphasized contour component; a synthesizing means for synthesizing and outputting the input luminance signal and the enhancement signal whose over-emphasized portion is corrected by the over-emphasizing correction means; A contour correction device comprising:
り抽出された輪郭成分のレベルの増加に応じて補正量が
増加するように非線形補正を行うことを特徴とする請求
項１記載の輪郭補正装置。2. The contour correction according to claim 1, wherein the emphasizing means performs non-linear correction so that the correction amount increases in accordance with an increase in the level of the contour component extracted by the contour extracting means. apparatus.
号レベルが黒レベル及び白レベルに至る区間は補正量が
逓減し、該黒レベルと白レベルの間の区間は補正量が一
定となるように非線形補正を行うことを特徴とする請求
項１記載の輪郭補正装置。3. The over-enhancement correction means gradually decreases the correction amount in a section where the input luminance signal level reaches the black level and the white level, and the correction amount becomes constant in the section between the black level and the white level. The contour correction apparatus according to claim 1, wherein the non-linear correction is performed as described above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21648992A JP3298162B2 (en) | 1992-07-21 | 1992-07-21 | Contour correction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21648992A JP3298162B2 (en) | 1992-07-21 | 1992-07-21 | Contour correction device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0646293A true JPH0646293A (en) | 1994-02-18 |
| JP3298162B2 JP3298162B2 (en) | 2002-07-02 |
Family
ID=16689237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21648992A Expired - Fee Related JP3298162B2 (en) | 1992-07-21 | 1992-07-21 | Contour correction device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3298162B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999005856A1 (en) * | 1997-07-25 | 1999-02-04 | Fujitsu General Limited | Contour emphasizing circuit |
| US6618097B1 (en) | 1999-08-10 | 2003-09-09 | Alps Electric Co., Ltd. | Image display apparatus and contour detecting circuit provided therein |
| US7212686B2 (en) | 2002-03-08 | 2007-05-01 | Sony Corporation | Image processing apparatus |
| JP2009021905A (en) * | 2007-07-13 | 2009-01-29 | Hoya Corp | Contour enhancement apparatus |
| JP2010118890A (en) * | 2008-11-13 | 2010-05-27 | Seiko Epson Corp | Image processing device, image display device, and image processing method |
| JP2011254214A (en) * | 2010-06-01 | 2011-12-15 | Hoya Corp | Outline emphasis apparatus |
| JP2016189590A (en) * | 2016-04-28 | 2016-11-04 | 三菱電機株式会社 | Image processing device and method and image display device |
-
1992
- 1992-07-21 JP JP21648992A patent/JP3298162B2/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999005856A1 (en) * | 1997-07-25 | 1999-02-04 | Fujitsu General Limited | Contour emphasizing circuit |
| AU739441B2 (en) * | 1997-07-25 | 2001-10-11 | Fujitsu General Limited | Contour emphasizing circuit |
| US6476876B1 (en) | 1997-07-25 | 2002-11-05 | Fujitsu General Limited | Contour emphasizing circuit |
| US6618097B1 (en) | 1999-08-10 | 2003-09-09 | Alps Electric Co., Ltd. | Image display apparatus and contour detecting circuit provided therein |
| US7212686B2 (en) | 2002-03-08 | 2007-05-01 | Sony Corporation | Image processing apparatus |
| JP2009021905A (en) * | 2007-07-13 | 2009-01-29 | Hoya Corp | Contour enhancement apparatus |
| US8170362B2 (en) | 2007-07-13 | 2012-05-01 | Hoya Corporation | Edge-enhancement device and edge-enhancement method |
| JP2010118890A (en) * | 2008-11-13 | 2010-05-27 | Seiko Epson Corp | Image processing device, image display device, and image processing method |
| JP2011254214A (en) * | 2010-06-01 | 2011-12-15 | Hoya Corp | Outline emphasis apparatus |
| JP2016189590A (en) * | 2016-04-28 | 2016-11-04 | 三菱電機株式会社 | Image processing device and method and image display device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3298162B2 (en) | 2002-07-02 |
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