JP3278483B2 - Contour correction circuit - Google Patents
Contour correction circuitInfo
- Publication number
- JP3278483B2 JP3278483B2 JP02535893A JP2535893A JP3278483B2 JP 3278483 B2 JP3278483 B2 JP 3278483B2 JP 02535893 A JP02535893 A JP 02535893A JP 2535893 A JP2535893 A JP 2535893A JP 3278483 B2 JP3278483 B2 JP 3278483B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- contour correction
- delay
- pixel cycle
- 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.)
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- Picture Signal Circuits (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、テレビカメラやビデオ
カメラ等の受光部から出力された映像輝度信号に対して
水平輪郭補正をするための輪郭補正回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contour correction circuit for correcting a horizontal contour of a video luminance signal output from a light receiving section of a television camera, a video camera or the like.
【０００２】[0002]
【従来の技術】図３は、従来の輪郭補正回路を示し、ビ
デオカメラ映像輝度信号処理における水平輪郭補正回路
のブロック図である。同図において、１Ａは信号Ｉが入
力される入力端子、２Ａは信号Ｉの入力を受け、該信号
ＩをＣＣＤの一画素周期に相当する時間だけ遅延させて
信号Ｊを出力する第１の遅延回路、３Ａは信号Ｊの入力
を受け、該信号ＪをＣＣＤの一画素周期に相当する時間
だけ遅延させて信号Ｋを出力する第２の遅延回路、４Ａ
は信号Ｉ及び信号Ｊの入力を受け、信号Ｊから信号Ｉを
減算して信号Ｌを出力する第１の減算回路、５Ａは信号
Ｊ及び信号Ｋの入力を受け、信号Ｊから信号Ｋを減算し
て信号Ｍを出力する第２の減算回路、６Ａは信号Ｌ及び
信号Ｍの入力を受け、信号Ｌと信号Ｍとを加算して信号
Ｎを出力する第１の加算回路、１１は信号Ｎを所定比で
減衰させて信号Ｏを出力する減衰器、９Ａは信号Ｊ及び
信号Ｏの入力を受け、信号Ｊと信号Ｏとを加算して信号
Ｐを出力する第２の加算回路、１０Ａは信号Ｐを出力す
る出力端子である。2. Description of the Related Art FIG. 3 shows a conventional contour correction circuit, and is a block diagram of a horizontal contour correction circuit in video camera video luminance signal processing. In the figure, 1A is an input terminal to which a signal I is input, 2A is a first delay for receiving the signal I, delaying the signal I by a time corresponding to one pixel cycle of the CCD, and outputting a signal J. Circuit 3A receives a signal J, delays the signal J by a time corresponding to one pixel period of the CCD, and outputs a signal K, and outputs a signal K.
Receives a signal I and a signal J, subtracts the signal I from the signal J and outputs a signal L, and 5A receives a signal J and a signal K and subtracts the signal K from the signal J. A second subtraction circuit 6A receives the signal L and the signal M, outputs a signal N by adding the signal L and the signal M, and 11 denotes a signal N. Attenuator that attenuates the signal J at a predetermined ratio and outputs a signal O; 9A receives a signal J and a signal O, adds a signal J and the signal O, and outputs a signal P; An output terminal for outputting the signal P.
【０００３】以下、上記のように構成された輪郭補正回
路の信号処理について、図４の波形図を参考にしながら
説明する。[0003] Hereinafter, signal processing of the contour correction circuit configured as described above will be described with reference to the waveform diagram of FIG.
【０００４】まず、入力端子１Ａに図４（ａ）に示す映
像輝度信号Ｉが入力されると、第１の遅延回路２ＡはＣ
ＣＤの一画素周期に相当する時間だけ遅延した図４
（ｂ）に示す一画素周期遅延信号Ｊを出力し、第２の遅
延回路３ＡはさらにＣＣＤの一画素周期に相当する時間
だけ遅延した図４（ｃ）に示す二画素周期遅延信号Ｋを
出力する。First, when the video luminance signal I shown in FIG. 4A is input to the input terminal 1A, the first delay circuit 2A
FIG. 4 delayed by a time corresponding to one pixel cycle of CD
The second delay circuit 3A outputs the one-pixel cycle delay signal K shown in FIG. 4C, which is further delayed by a time corresponding to one pixel cycle of the CCD, as shown in FIG. I do.
【０００５】次に、第１の減算回路４Ａは、一画素周期
遅延信号Ｊから映像輝度信号Ｉを減算することにより映
像輝度信号Ｉの微分波形が反転された波形である図４
（ｄ）に示す第１の微分信号Ｌを出力し、第２の減算回
路５Ａは、一画素周期遅延信号Ｊから二画素周期遅延信
号Ｋを減算することにより一画素周期遅延信号Ｊが微分
された波形である図４（ｅ）に示す第２の微分信号Ｍを
出力する。Next, the first subtraction circuit 4A subtracts the video luminance signal I from the one-pixel period delay signal J to invert the differential waveform of the video luminance signal I.
(D) is output, and the second subtraction circuit 5A differentiates the one-pixel cycle delay signal J by subtracting the two-pixel cycle delay signal K from the one-pixel cycle delay signal J. A second differentiated signal M shown in FIG.
【０００６】次に、第１の加算回路６Ａは、第１の微分
信号Ｌと第２の微分信号Ｍとを加算することにより上下
振動する波形である図４（ｆ）に示す第３の微分信号Ｎ
を出力する。Next, the first adder circuit 6A adds the first differential signal L and the second differential signal M to form a third differential signal shown in FIG. Signal N
Is output.
【０００７】上記第３の微分信号Ｎは映像輝度信号Ｉの
レベル変化量と同等の振幅を有しているため、減衰器１
１により第３の微分信号Ｎを所定比例えば１／２に減衰
して図４（ｇ）に示す水平輪郭補正信号Ｏを得る。Since the third differential signal N has the same amplitude as the level change of the video luminance signal I, the attenuator 1
By 1 the third differential signal N is attenuated to a predetermined ratio, for example, 1/2 to obtain a horizontal contour correction signal O shown in FIG.
【０００８】さらに、第２の加算回路９Ａは、一画素周
期遅延信号Ｊと水平輪郭補正信号Ｏとを加算することに
より輪郭補正された図４（ｈ）に示す補正映像輝度信号
Ｐを出力し、該補正映像輝度信号Ｐは出力端子１０Ａか
ら出力される。Further, the second adding circuit 9A outputs a corrected image luminance signal P shown in FIG. 4 (h), which is contour-corrected by adding the one-pixel cycle delay signal J and the horizontal contour correction signal O. The corrected video luminance signal P is output from the output terminal 10A.
【０００９】[0009]
【発明が解決しようとする課題】しかしながら、上記の
ような構成では、図４（ａ）及び（ｄ）から明らかなよ
うに、元の映像輝度信号の輝度変化量の小さい部位ａ0
では輪郭補正量は小さく、輝度変化量の大きい部位ｃ0
では輪郭補正量は大きくなる。そして、所定比で減衰さ
れた水平輪郭補正信号の部位ａ1 ，ｂ1 ，ｃ1 の輪郭補
正量が映像輝度信号Ｉに加算される。このため、輝度変
化量の小さい部位ａ0 の輪郭補正量に合わせて減衰量を
設定すると、輝度変化量の大きい部位ｃ0 の輪郭補正量
が大きくなりすぎて、輝度変化量の大きい部位ｃ0 はぎ
らぎらした画像になってしまい、逆に、輝度変化量の大
きい部位ｃ0 の輪郭補正量に合わせて減衰量を設定する
と、輝度変化量の小さい部位ａ0 の輪郭補正量が小さく
なりすぎて、輝度変化量の小さい部位ａ0 に相当する画
像の輪郭がくっきりしないという問題がある。However, in the above configuration, as apparent from FIGS. 4 (a) and 4 (d), a portion a 0 of the original video luminance signal where the luminance variation is small.
In this case, the portion c 0 where the contour correction amount is small and the luminance change amount is large
Then, the contour correction amount becomes large. Then, the contour correction amounts of the parts a 1 , b 1 , c 1 of the horizontal contour correction signal attenuated at a predetermined ratio are added to the video luminance signal I. For this reason, if the attenuation is set in accordance with the contour correction amount of the portion a 0 having the small luminance change amount, the contour correction amount of the portion c 0 having the large luminance change amount becomes too large, and the portion c 0 having the large luminance change amount is obtained. Conversely, when the attenuation amount is set in accordance with the contour correction amount of the portion c 0 having a large luminance change amount, the contour correction amount of the portion a 0 having a small luminance change amount becomes too small. , there is a problem that the contour of the image corresponding to the small region a 0 luminance variation is not clear.
【００１０】上記に鑑み、本発明は、映像輝度信号の輝
度変化量の小さい部位ではくっきりとした輪郭補正が行
なわれ、映像輝度信号の輝度変化量の大きい部位ではぎ
らぎらしない程度に抑制された輪郭補正が行なわれるよ
うにすることを目的とする。In view of the above, according to the present invention, a sharp contour correction is performed in a portion where the luminance change amount of the video luminance signal is small, and the contour is suppressed so as not to be glaring in a portion where the luminance change amount of the video luminance signal is large. It is intended that correction be performed.
【００１１】[0011]
【課題を解決するための手段】上記の目的を達成するた
め、本発明は、映像輝度信号に該映像輝度信号の輝度変
化量に基づき演算された輪郭補正量が付加されてなる輪
郭補正信号の上記輪郭補正量の大きさが反比例の関係に
なるように上記輪郭補正信号に利得を設定するものであ
る。In order to achieve the above object, the present invention provides a contour correction signal which is obtained by adding a contour correction amount calculated based on a luminance change amount of a video luminance signal to a video luminance signal. The gain is set to the contour correction signal so that the magnitude of the contour correction amount is inversely proportional.
【００１２】具体的に本発明が講じた解決手段は、テレ
ビカメラやビデオカメラ等の受光部から出力された映像
輝度信号の輝度変化量に基づき該輝度変化量に正比例す
る輪郭補正量を演算し、演算した輪郭補正量を上記映像
輝度信号に付加して輪郭補正信号として出力する演算回
路と、上記輪郭補正信号から輪郭補正量を検出する検出
回路と、該検出回路が検出した輪郭補正量に基づき上記
輪郭補正信号に該輪郭補正信号の輪郭補正量の大きさが
反比例の関係になるような利得を設定する利得制御回路
とを備えている構成とするものである。Specifically, a solution means taken by the present invention is to calculate a contour correction amount that is directly proportional to the luminance change amount based on the luminance change amount of a video luminance signal output from a light receiving unit such as a television camera or a video camera. An arithmetic circuit for adding the calculated contour correction amount to the video luminance signal and outputting the contour correction signal as a contour correction signal; a detection circuit for detecting the contour correction amount from the contour correction signal; and a contour correction amount detected by the detection circuit. And a gain control circuit for setting a gain such that the magnitude of the contour correction amount of the contour correction signal is inversely proportional to the contour correction signal.
【００１３】[0013]
【作用】上記の構成により、映像輝度信号の輝度変化量
が大きい部位では輪郭補正信号の輪郭補正量は大きくな
るが、利得制御回路は輪郭補正量の大きさが反比例の関
係になるような利得を設定するため、輪郭補正回路から
出力される輪郭補正信号においては、映像輝度信号の輝
度変化量の大きい部位の輪郭補正量が小さくなる。ま
た、映像輝度信号の輝度変化量が小さい部位では輪郭補
正信号の輪郭補正量は小さくなるが、利得制御回路が輪
郭補正量の大きさが反比例の関係になるような利得を設
定するため、輪郭補正回路から出力される輪郭補正信号
においては、映像輝度信号の輝度変化量の小さい部位の
輪郭補正量が大きくなる。With the above arrangement, the contour correction amount of the contour correction signal is large in a portion where the luminance change amount of the video luminance signal is large, but the gain control circuit determines that the magnitude of the contour correction amount is inversely proportional. In the contour correction signal output from the contour correction circuit, the contour correction amount of a portion where the luminance change amount of the video luminance signal is large is small. Further, the contour correction amount of the contour correction signal is small in a portion where the luminance change amount of the video luminance signal is small, but since the gain control circuit sets the gain such that the magnitude of the contour correction amount is in inverse proportion, In the contour correction signal output from the correction circuit, the contour correction amount of a portion where the luminance change amount of the video luminance signal is small increases.
【００１４】[0014]
【実施例】以下、本発明の一実施例に係る輪郭補正回路
について図面を参照しながら説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A contour correction circuit according to one embodiment of the present invention will be described below with reference to the drawings.
【００１５】図１は、本発明の一実施例に係るビデオカ
メラの輝度信号処理における輪郭補正回路のブロック図
である。FIG. 1 is a block diagram of an outline correction circuit in luminance signal processing of a video camera according to an embodiment of the present invention.
【００１６】同図において、１Ｂは信号Ａが入力される
入力端子、２Ｂは信号Ａの入力を受け、該信号ＡをＣＣ
Ｄの一画素周期に相当する時間だけ遅延させて信号Ｂを
出力する第１の遅延回路、３Ｂは信号Ｂの入力を受け、
該信号ＢをＣＣＤの一画素周期に相当する時間だけ遅延
させて信号Ｃを出力する第２の遅延回路、４Ｂは信号Ａ
及び信号Ｂの入力を受け、信号Ｂから信号Ａを減算して
信号Ｄを出力する第１の減算回路、５Ｂは信号Ｂ及び信
号Ｃの入力を受け、信号Ｂから信号Ｃを減算して信号Ｅ
を出力する第２の減算回路、６Ｂは信号Ｄ及び信号Ｅの
入力を受け、信号Ｄと信号Ｅとを加算して信号Ｆを出力
する第１の加算回路、７は信号Ｆの入力を受け、信号Ｆ
を両波整流して信号Ｆのピーク値を検出し、ピーク値信
号を出力する検出回路、８は信号Ｆ及びピーク値信号の
入力を受け、該ピーク値信号のピーク値のレベルが反比
例するように利得設定を行なって信号Ｇを出力する利得
制御回路、９Ｂは信号Ｂ及び信号Ｇの入力を受け、信号
Ｂと信号Ｇとを加算して信号Ｈを出力する出力端子であ
る。以上説明した第１の遅延回路２Ｂ、第２の遅延回路
３Ｂ及び第１の減算回路４Ｂによって演算回路が構成さ
れている。In FIG. 1, 1B is an input terminal to which a signal A is input, 2B is an input terminal for receiving the signal A, and
A first delay circuit that outputs a signal B with a delay corresponding to one pixel period of D, and receives a signal B;
A second delay circuit for delaying the signal B by a time corresponding to one pixel cycle of the CCD and outputting a signal C, and 4B
And a first subtraction circuit 5B that receives the input of the signal B, subtracts the signal A from the signal B and outputs the signal D, and the first subtraction circuit 5B receives the inputs of the signals B and C, subtracts the signal C from the signal B, and outputs a signal. E
, A first subtraction circuit that receives signals D and E, adds a signal D and a signal E and outputs a signal F, and 7 receives a signal F. , Signal F
A detection circuit 8 for detecting the peak value of the signal F and outputting the peak value signal, and receiving the signal F and the peak value signal so that the level of the peak value of the peak value signal is inversely proportional. And a gain control circuit 9B which receives the signals B and G, adds the signals B and G, and outputs a signal H. An arithmetic circuit is configured by the first delay circuit 2B, the second delay circuit 3B, and the first subtraction circuit 4B described above.
【００１７】以下、上記のように構成された輪郭補正回
路の信号処理について、図２の波形図を参考にしながら
説明する。Hereinafter, the signal processing of the contour correction circuit configured as described above will be described with reference to the waveform diagram of FIG.
【００１８】まず、入力端子１Ｂに図２（ａ）に示す映
像輝度信号Ａが入力されると、第１の遅延回路２ＢはＣ
ＣＤの一画素周期に相当する時間だけ遅延した図２
（ｂ）に示す一画素周期遅延信号Ｂを出力し、第２の遅
延回路３ＢはさらにＣＣＤの一画素周期に相当する時間
だけ遅延した図２（ｃ）に示す二画素周期遅延信号Ｃを
出力する。First, when the video luminance signal A shown in FIG. 2A is input to the input terminal 1B, the first delay circuit 2B
FIG. 2 delayed by a time corresponding to one pixel cycle of CD
The second delay circuit 3B outputs a one-pixel cycle delay signal C shown in FIG. 2C, which is further delayed by a time corresponding to one pixel cycle of the CCD. I do.
【００１９】次に、第１の減算回路４Ｂは、一画素周期
遅延信号Ｂから映像輝度信号Ａを減算することにより映
像輝度信号Ａの微分波形が反転された波形である図２
（ｄ）に示す第１の微分信号Ｄを出力し、第２の減算回
路５Ｂは、一画素周期遅延信号Ｂから二画素周期遅延信
号Ｃを減算することにより一画素周期遅延信号Ｂが微分
された波形である図２（ｅ）に示す第２の微分信号Ｅを
出力する。Next, the first subtraction circuit 4B subtracts the video luminance signal A from the one-pixel period delay signal B, and is a waveform obtained by inverting the differential waveform of the video luminance signal A in FIG.
(D) is output, and the second subtraction circuit 5B differentiates the one-pixel cycle delay signal B by subtracting the two-pixel cycle delay signal C from the one-pixel cycle delay signal B. The second differential signal E shown in FIG.
【００２０】次に、第１の加算回路６Ｂは、第１の微分
信号Ｄと第２の微分信号Ｅとを加算することにより上下
振動する波形である図２（ｆ）に示す第３の微分信号Ｆ
を出力する。Next, the first adder circuit 6B adds the first differential signal D and the second differential signal E to form a third differential signal shown in FIG. Signal F
Is output.
【００２１】次に、検出回路７は、水平輪郭補正信号で
ある第３の微分信号Ｆの入力を受けると、輪郭補正量を
両波整流してピーク値の検出を行ない、検出したピーク
値をピーク値信号として利得制御回路８に出力する。Next, when the detection circuit 7 receives the input of the third differential signal F, which is a horizontal contour correction signal, the contour correction amount is double-wave rectified to detect a peak value, and the detected peak value is calculated. The signal is output to the gain control circuit 8 as a peak value signal.
【００２２】次に、利得制御回路８は、第３の微分信号
Ｆ及び上記ピーク値信号の入力を受けると、第３の微分
信号Ｆのピーク値のレベルに基づき、第１の微分信号Ｄ
における部位ａ0 ，ｂ0 ，ｃ0 の輪郭補正量が図２
（ｇ）に示す信号Ｇにおける部位ａ 2 ，ｂ 2 ，ｃ 2 の輪
郭補正量になるように、つまり第３の微分信号Ｆのピー
ク値のレベルが反比例するように利得設定を行ない、利
得設定が行なわれた図２（ｇ）に示す波形の利得設定信
号Ｇを出力する。Next, upon receiving the third differential signal F and the above-mentioned peak value signal, the gain control circuit 8 receives the first differential signal D based on the level of the peak value of the third differential signal F.
The contour correction amounts of the parts a 0 , b 0 , c 0 in FIG.
The gain is set so that the contour correction amounts of the portions a 2 , b 2 , and c 2 in the signal G shown in (g) become equal, that is, the level of the peak value of the third differential signal F is inversely proportional. The gain setting signal G having the waveform shown in FIG.
【００２３】さらに、第２の加算回路９Ｂは、一画素周
期遅延信号Ｂと利得設定信号Ｇとを加算することにより
輪郭補正された図４（ｈ）に示す波形の補正映像輝度信
号Ｈを出力し、該補正映像輝度信号Ｈは出力端子１０Ｂ
から出力される。Further, the second adder circuit 9B outputs a corrected video luminance signal H having a waveform shown in FIG. 4 (h) corrected by adding the one-pixel period delay signal B and the gain setting signal G. The corrected video luminance signal H is output from the output terminal 10B.
Output from
【００２４】以上のように、利得制御回路８は、映像輝
度信号における変化量の小さい部位ａ0 の補正量が大き
くなり、映像輝度信号における変化量の大きい部位ｃ0
の補正量が小さくなるように利得設定を行なうので、全
体的な輪郭補正量は最適化される。As described above, the gain control circuit 8 increases the correction amount of the portion a 0 where the amount of change in the video luminance signal is small and the portion c 0 where the amount of change in the video luminance signal is large
Since the gain setting is performed so as to reduce the correction amount, the overall contour correction amount is optimized.
【００２５】[0025]
【発明の効果】以上説明したように、本発明に係る輪郭
補正回路によると、輪郭補正信号から輪郭補正量を検出
する検出回路と、該検出回路が検出した輪郭補正量に基
づき輪郭補正信号に該輪郭補正信号の輪郭補正量の大き
さが反比例の関係になるような利得を設定する利得制御
回路とを備えているため、映像輝度信号の輝度変化量が
大きい部位では、演算回路から出力される輪郭補正信号
の輪郭補正量が大きくなるが、輪郭補正回路から出力さ
れる輪郭補正信号の輪郭補正量は小さくなり、映像輝度
信号の輝度変化量が小さい部位では、演算回路から出力
される輪郭補正信号の輪郭補正量が小さくなるが、輪郭
補正回路から出力される輪郭補正信号の輪郭補正量は大
きくなるので、輝度変化量の小さい部位ではくっきりと
した輪郭補正をすることができ、輝度変化量の大きい部
位ではぎらぎらしない程度の輪郭補正をすることができ
る。As described above, according to the contour correction circuit according to the present invention, a detection circuit for detecting a contour correction amount from a contour correction signal, and a contour correction signal based on the contour correction amount detected by the detection circuit. And a gain control circuit for setting a gain such that the magnitude of the contour correction amount of the contour correction signal is in an inversely proportional relationship. Although the contour correction amount of the contour correction signal becomes large, the contour correction amount of the contour correction signal output from the contour correction circuit decreases, and the contour output from the arithmetic circuit is reduced in a portion where the luminance change amount of the video luminance signal is small. Although the contour correction amount of the correction signal is small, the contour correction amount of the contour correction signal output from the contour correction circuit is large. It can be, in large part of luminance variation may be the degree of contour correction without glare.
【図１】本発明の一実施例に係る輪郭補正回路を示すブ
ロック図である。FIG. 1 is a block diagram showing a contour correction circuit according to one embodiment of the present invention.
【図２】上記一実施例に係る輪郭補正回路における水平
輪郭補正信号の発生状態を説明する波形図である。FIG. 2 is a waveform diagram illustrating a generation state of a horizontal contour correction signal in the contour correction circuit according to the embodiment.
【図３】従来の輪郭補正回路を示すブロック図である。FIG. 3 is a block diagram showing a conventional contour correction circuit.
【図４】従来の輪郭補正回路における水平輪郭補正信号
の発生状態を説明する波形図である。FIG. 4 is a waveform diagram illustrating a state of generation of a horizontal contour correction signal in a conventional contour correction circuit.
１Ａ，１Ｂ 入力端子 ２Ａ，２Ｂ 第１の遅延回路（演算回路） ３Ａ，３Ｂ 第２の遅延回路（演算回路） ４Ａ，４Ｂ 第１の減算回路（演算回路） ５Ａ，５Ｂ 第２の減算回路 ６Ａ，６Ｂ 第１の加算回路 ７ 検出回路 ８ 利得制御回路 ９Ａ，９Ｂ 第２の加算回路 １０Ａ １０Ｂ 出力端子 １１ 減衰器 1A, 1B Input terminals 2A, 2B First delay circuit (arithmetic circuit) 3A, 3B Second delay circuit (arithmetic circuit) 4A, 4B First subtraction circuit (arithmetic circuit) 5A, 5B Second subtraction circuit 6A , 6B First adder circuit 7 Detection circuit 8 Gain control circuit 9A, 9B Second adder circuit 10A 10B Output terminal 11 Attenuator
Claims (1)
信号をＣＣＤの一画素周期に相当する時間だけ遅延させ
て一画素周期遅延信号を出力する第１の遅延回路と、 前記一画素周期遅延信号の入力を受け、前記一画素周期
遅延信号をＣＣＤの一画素周期に相当する時間だけ遅延
させて二画素周期遅延信号を出力する第２の遅延回路
と、 前記映像信号及び前記一画素周期遅延信号の入力を受
け、前記一画素周期遅延信号から前記映像信号を減算し
て第１の微分信号を出力する第１の減算回路と、 前記一画素周期遅延信号及び前記二画素周期遅延信号の
入力を受け、前記一画素周期遅延信号から前記二画素周
期遅延信号を減算して第２の微分信号を出力する第２の
減算回路と、 前記第１の微分信号及び前記第２の微分信号の入力を受
け、前記第１の微分信号と前記第２の微分信号とを加算
して第３の微分信号を出力する加算回路と、 前記第３の微分信号の入力を受け、前記第３の微分信号
を両波整流して第３の微分信号のピーク値を検出し、検
出したピーク値をピーク値信号として出力する検出回路
と、 前記第３の微分信号及び前記ピーク値信号の入力を受
け、前記ピーク値信号のピーク値のレベルが反比例する
ように利得設定を行なって利得設定信号を出力する利得
制御回路と、 前記一画素周期遅延信号及び前記利得設定信号の入力を
受け、前記一画素周期遅延信号と前記利得設定信号とを
加算して補正映像信号を出力する出力端子とを 備えてい
ることを特徴とする輪郭補正回路。 An input terminal to which a video signal is input; and an input terminal for receiving the video signal from the input terminal.
The signal is delayed by a time corresponding to one pixel cycle of the CCD.
A first delay circuit that outputs a one-pixel cycle delay signal, and receives the one-pixel cycle delay signal,
Delay the delay signal by the time corresponding to one pixel cycle of the CCD
Delay circuit for outputting a two-pixel cycle delay signal
If, receiving the input of the video signal and the one pixel period delay signal
Subtracting the video signal from the one-pixel cycle delay signal
A first subtraction circuit that outputs a first differential signal to the one pixel cycle delay signal and the two pixel cycle delay signal.
Receiving the input, the one pixel cycle delay signal
A second differential signal that subtracts the first delayed signal and outputs a second differentiated signal.
A subtraction circuit for receiving an input of the first differential signal and the second differential signal;
Adding the first differentiated signal and the second differentiated signal
To a third adder circuit which outputs a differential signal of the receive inputs of the third differential signal, said third differential signal
Is subjected to both-wave rectification and the peak value of the third differential signal is detected.
Detection circuit that outputs the output peak value as a peak value signal
If, receiving an input of the third differential signal and the peak value signal
The level of the peak value of the peak value signal is inversely proportional
To set the gain and output the gain setting signal
A control circuit, and an input of the one-pixel cycle delay signal and the gain setting signal;
Receiving the one-pixel cycle delay signal and the gain setting signal.
An output terminal for adding and outputting a corrected video signal .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02535893A JP3278483B2 (en) | 1993-02-15 | 1993-02-15 | Contour correction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02535893A JP3278483B2 (en) | 1993-02-15 | 1993-02-15 | Contour correction circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06245103A JPH06245103A (en) | 1994-09-02 |
| JP3278483B2 true JP3278483B2 (en) | 2002-04-30 |
Family
ID=12163626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02535893A Expired - Fee Related JP3278483B2 (en) | 1993-02-15 | 1993-02-15 | Contour correction circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3278483B2 (en) |
-
1993
- 1993-02-15 JP JP02535893A patent/JP3278483B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06245103A (en) | 1994-09-02 |
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