JPH0514771A - Outline correcting device - Google Patents
Outline correcting deviceInfo
- Publication number
- JPH0514771A JPH0514771A JP3164340A JP16434091A JPH0514771A JP H0514771 A JPH0514771 A JP H0514771A JP 3164340 A JP3164340 A JP 3164340A JP 16434091 A JP16434091 A JP 16434091A JP H0514771 A JPH0514771 A JP H0514771A
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- Prior art keywords
- signal
- circuit
- minimum value
- delay circuit
- delay
- Prior art date
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- 230000001934 delay Effects 0.000 claims description 4
- 230000004069 differentiation Effects 0.000 abstract 3
- 230000003111 delayed effect Effects 0.000 description 27
- 230000000630 rising effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 239000000470 constituent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、テレビ受像機、ビデオ
テープレコーダやビデオプロジェクタの映像信号の輪郭
部分の立ち上がり、または立ち下がりをより急峻にする
場合に用いることができる輪郭補正装置に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contour correcting device which can be used for making a rising or falling edge of a contour portion of a video signal of a television receiver, a video tape recorder or a video projector steeper. is there.
【０００２】[0002]
【従来の技術】近年、テレビ受像機の高画質化の傾向が
強まっており、画像の輪郭部分をより鮮明に見せるため
に、輪郭補正装置が重要視されている。2. Description of the Related Art In recent years, the trend toward higher image quality of television receivers has been increasing, and in order to make the contour portion of an image look clearer, a contour correction device is regarded as important.
【０００３】出願人は以前に、以下に説明するような輪
郭補正装置を出願した。（図５）はそのブロック図を示
すものである。（図５）において、１は遅延回路であ
り、入力映像信号ａから、遅延入力映像信号ｂを得るも
のである。２は引算回路であり、入力映像信号ａから遅
延入力映像信号ｂを引算し、１次微分信号ｃを得る。３
は遅延回路であり、１次微分信号ｃから遅延１次微分信
号ｄを得る。４は最小値回路であり、１次微分信号ｃと
遅延１次微分信号ｄとの最小値を取り出し、最小値１次
微分信号ｅを得る。５、７は遅延回路であり、最小値１
次微分信号ｅから第１の遅延最小値１次微分信号ｆまた
は第２の遅延最小値１次微分信号ｈを得る。６は引算回
路であり、最小値１次微分信号ｅから第１の遅延最小値
１次微分信号ｆを引算し、２次微分信号ｇを得る。８は
最小値回路であり、２次微分信号ｇと第２の遅延最小値
１次微分信号ｈとの最小値を取り出し、補正信号ｉを得
る。９は遅延回路であり、入力映像信号ａから遅延入力
映像信号ｊを得る。１０は引算回路であり、遅延入力映
像信号ｊから補正信号ｉを引くことで、出力映像信号ｋ
を得る。The applicant has previously applied for a contour correction device as described below. FIG. 5 shows a block diagram thereof. In FIG. 5, reference numeral 1 denotes a delay circuit, which obtains the delayed input video signal b from the input video signal a. A subtraction circuit 2 subtracts the delayed input video signal b from the input video signal a to obtain a primary differential signal c. Three
Is a delay circuit, which obtains a delayed primary differential signal d from the primary differential signal c. A minimum value circuit 4 takes out the minimum value of the primary differential signal c and the delayed primary differential signal d to obtain the minimum primary differential signal e. Delay circuits 5 and 7 have a minimum value of 1
From the second derivative signal e, the first delay minimum value first derivative signal f or the second delay minimum value first derivative signal h is obtained. Reference numeral 6 denotes a subtraction circuit, which subtracts the first delay minimum value first-order differential signal f from the minimum value first-order differential signal e to obtain a second-order differential signal g. A minimum value circuit 8 takes out the minimum value of the secondary differential signal g and the second delay minimum value primary differential signal h to obtain a correction signal i. Reference numeral 9 denotes a delay circuit, which obtains a delayed input video signal j from the input video signal a. Reference numeral 10 denotes a subtraction circuit, which subtracts the correction signal i from the delayed input video signal j to output the output video signal k.
To get
【０００４】以上のように構成された輪郭補正装置につ
いて、以下（図６）を用いてその動作について説明す
る。まず、入力映像信号ａを遅延回路１で遅延させ、遅
延映像入力信号ｂを得、この遅延映像入力信号ｂを入力
映像信号ａから引算回路２で引算し、１次微分信号ｃを
得る。次に、遅延回路３により、この１次微分信号ｃ
を、遅延回路１と同じ時間だけ遅延させた遅延１次微分
信号ｄを得た後、最小値回路４で１次微分信号ｃと遅延
１次微分信号ｄの絶対値の小さいほうを選択し、最小値
１次微分信号ｅを得る。ただし、符号が異なっていれば
零を出力する。こうして得られた最小値１次微分信号ｅ
は、必ず入力映像信号ａの輪郭部分の立ち上がりまたは
立ち下がりの時間と同じ幅をもつ。次に、遅延回路５、
７により、この最小値１次微分信号ｅを遅延させ、第１
の遅延最小値１次微分信号ｆおよび第２の遅延最小値１
次微分信号ｈを得る。このとき遅延回路７の遅延時間
は、遅延回路５の遅延時間の１／２である。次に、引算
回路６で、最小値１次微分信号ｅから第１の遅延最小値
１次微分信号ｆを引算し、２次微分信号ｇを得、最小値
回路８で２次微分信号ｇと第２の遅延最小値１次微分信
号ｈの絶対値の小さいほうを選択し、補正信号ｉを得
る。ただし、符号は２次微分信号ｇと同じ符号を用い
る。次に、この補正信号ｉを、入力映像信号ａを、以上
の演算処理にかかった時間だけ遅延させた信号ｊから引
算回路１０により、引くことにより出力映像信号ｋを得
る。この信号ｋは、必ず入力映像信号ａの輪郭部分の立
ち上がりまたは立ち下がりの時間と同じ幅をもつので、
プリシュート、オーバーシュートなしに輪郭補正が行え
る。The operation of the contour correction device configured as described above will be described below (FIG. 6). First, the input video signal a is delayed by the delay circuit 1 to obtain the delayed video input signal b, and the delayed video input signal b is subtracted from the input video signal a by the subtraction circuit 2 to obtain the primary differential signal c. . Next, the delay circuit 3 causes the primary differential signal c
After obtaining the delayed primary differential signal d delayed by the same time as the delay circuit 1, the minimum value circuit 4 selects the smaller absolute value of the primary differential signal c and the delayed primary differential signal d, The minimum value first derivative signal e is obtained. However, if the signs are different, zero is output. Minimum value first derivative signal e thus obtained
Always has the same width as the rising or falling time of the contour portion of the input video signal a. Next, the delay circuit 5,
7, the minimum first-order differential signal e is delayed to
Delay minimum value first derivative signal f and second delay minimum value 1
The second derivative signal h is obtained. At this time, the delay time of the delay circuit 7 is 1/2 of the delay time of the delay circuit 5. Next, the subtraction circuit 6 subtracts the first delay minimum value first-order differential signal f from the minimum value first-order differential signal e to obtain a second-order differential signal g, and the minimum-value circuit 8 outputs the second-order differential signal. g and the smaller absolute value of the second delay minimum value first-order differential signal h are selected to obtain the correction signal i. However, the same sign as the second derivative signal g is used. Next, the subtraction circuit 10 subtracts the correction signal i from the signal j obtained by delaying the input video signal a by the time required for the above arithmetic processing to obtain the output video signal k. Since this signal k always has the same width as the rising or falling time of the contour portion of the input video signal a,
Contour correction can be performed without preshoot and overshoot.
【０００５】[0005]
【発明が解決しようとする課題】以上に説明した輪郭補
正装置では入力映像信号の輪郭部分の傾きから、輪郭部
分の立ち上がりまたは立ち下がり時間と同じ時間幅の補
正信号が作られるので、入力映像信号の輪郭部分の傾き
に応じて、プリシュート、オーバーシュートなしに、映
像の輪郭を細く急峻に補正することができる。ところが
ブラウン管にはその物理的性質のため、直線的に信号振
幅が変化しても、画面の輝度は直線的に変化せず、暗い
部分になるにつれ輝度変化量が小さくなるような、いわ
ゆるγ特性が存在する。このため信号としては上下対称
に波形を補正したにもかかわらず、実際に輪郭補正した
映像をブラウン管で見ると、白と黒の縦線がある映像で
は、白い線が太くなり、黒い線が細くなるような不自然
な現象が生じる。In the contour correction apparatus described above, since the correction signal having the same time width as the rising or falling time of the contour portion is generated from the inclination of the contour portion of the input video signal, the input image signal is corrected. The contour of the image can be corrected finely and sharply without preshooting or overshooting according to the inclination of the contour portion. However, because of the physical properties of the cathode ray tube, the brightness of the screen does not change linearly even if the signal amplitude changes linearly, and the amount of change in brightness becomes smaller as it gets darker. Exists. For this reason, even though the waveform was corrected symmetrically in the vertical direction as a signal, when an image whose contour was actually corrected was viewed on a CRT, the white line became thick and the black line became thin in the image with vertical lines of white and black. An unnatural phenomenon such as
【０００６】本発明は上述の問題点に鑑み、ブラウン管
上で見て白部分や黒部分の印象を不自然に変えることな
く、入力映像信号の輪郭部分の傾きを急峻にできる輪郭
補正装置を提供するものである。In view of the above problems, the present invention provides a contour correction device capable of making the inclination of a contour portion of an input video signal steep without unnaturally changing the impression of a white portion or a black portion when viewed on a cathode ray tube. To do.
【０００７】[0007]
【課題を解決するための手段】この目的を達成するため
に、本発明の輪郭補正装置は、
（１）入力された映像信号を遅延する第１の遅延回路
と、これにより得られた信号を入力された映像信号から
引算する第１の引算回路と、この第１の引算回路の出力
信号を遅延する第２の遅延回路と、これにより得られた
信号と第１の引算回路の出力との小さいほうを出力する
第１の最小値回路と、この第１の最小値回路の出力信号
を遅延する第３の遅延回路と、これにより得られた信号
を第１の最小値回路の出力信号から引算する第２の引算
回路と、この第２の引算回路の出力信号にある一定の直
流電圧を加算する加算回路と、第１の最小値回路の出力
信号を遅延する第４の遅延回路と、この加算回路の出力
信号と第４の遅延回路の出力信号との絶対値の小さいほ
うを出力する第２の最小値回路と、入力された映像信号
を遅延する第５の遅延回路と、この第５の遅延回路の出
力信号から第２の最小値回路の出力信号を引算する第３
の引算回路を備えた構成である。
（２）入力された映像信号を遅延する第１の遅延回路
と、これにより得られた信号を入力された映像信号から
引算する第１の引算回路と、この第１の引算回路の出力
信号を遅延する第２の遅延回路と、これにより得られた
信号と第１の引算回路の出力との小さいほうを出力する
第１の最小値回路と、この第１の最小値回路の出力信号
を遅延する第３の遅延回路と、これにより得られた信号
を第１の最小値回路の出力信号から引算する第２の引算
回路と、第１の最小値回路の出力信号を遅延する第４の
遅延回路と、第２の加算回路の出力信号と第４の遅延回
路の出力信号との絶対値の小さいほうを出力する第２の
最小値回路と、第２の最小値回路の出力のうち正方向の
信号のみ取り出し負方向の信号のときはその出力を零と
する制限回路と、入力された映像信号を遅延する第５の
遅延回路と、この第５の遅延回路の出力信号から制限回
路の出力信号を引算する第３の引算回路を備えた構成で
ある。In order to achieve this object, the contour correction device of the present invention comprises: (1) a first delay circuit for delaying an input video signal, and a signal obtained thereby. A first subtraction circuit for subtracting from an input video signal, a second delay circuit for delaying an output signal of the first subtraction circuit, a signal obtained thereby, and a first subtraction circuit Of the output of the first minimum value circuit, a third delay circuit for delaying the output signal of the first minimum value circuit, and a signal obtained by the third delay circuit. Second subtraction circuit for subtracting from the output signal of the second subtraction circuit, an addition circuit for adding a certain DC voltage to the output signal of the second subtraction circuit, and a delay of the output signal of the first minimum value circuit. Absolute value of the fourth delay circuit and the output signal of the adder circuit and the output signal of the fourth delay circuit Of the second minimum value circuit, the fifth delay circuit for delaying the input video signal, and the output signal of the second minimum value circuit from the output signal of the fifth delay circuit. Third to add
This is a configuration including a subtraction circuit of. (2) A first delay circuit that delays an input video signal, a first subtraction circuit that subtracts a signal obtained thereby from an input video signal, and a first subtraction circuit A second delay circuit that delays the output signal, a first minimum value circuit that outputs the smaller of the signal obtained by this and the output of the first subtraction circuit, and the first minimum value circuit A third delay circuit for delaying the output signal, a second subtraction circuit for subtracting the signal thus obtained from the output signal of the first minimum value circuit, and an output signal of the first minimum value circuit A fourth delay circuit for delaying; a second minimum value circuit for outputting the smaller absolute value of the output signal of the second adding circuit and the output signal of the fourth delay circuit; and a second minimum value circuit Only the signal in the positive direction is taken out of the output of the A fifth delay circuit for delaying a video signal, a third configuration with subtraction circuit for subtracting the output signal of the limiting circuit from the output signal of the fifth delay circuit.
【０００８】[0008]
【作用】この構成によって、本発明は
（１）入力映像信号を遅延回路で遅延した信号を、入力
映像信号から引算した上、この信号と、この信号を遅延
回路で遅延した信号との最小値をとり、輪郭部分と同じ
幅をもった微分信号を得る。次にこの微分信号を遅延回
路で遅延した信号を元の微分信号から引算した上、予め
設定された一定の直流電圧を加算する。この信号と、微
分信号との絶対値の小さい方の値を取り、極性は前者の
信号極性を採用してこれを補正信号とする。この補正信
号を、以上の演算処理にかかった時間だけ遅延させた入
力映像信号から差し引くことで、入力信号がいかなる傾
きであってもプリシュート、オーバーシュートを発生さ
せず、かつ縦方向の黒線、白線の幅方向の変化を起こさ
ずに輪郭部分の傾きを急峻にするものである。
（２）入力映像信号を遅延回路で遅延した信号を、入力
映像信号から引算した上、この信号と、この信号を遅延
回路で遅延した信号との最小値をとり、輪郭部分と同じ
幅をもった微分信号を得る。次にこの微分信号を遅延回
路で遅延した信号を元の微分信号から引算する。この信
号と、微分信号との絶対値の小さい方の値を取った上、
前者の信号の極性が正であれば信号をそのまま出力し、
負であれば出力を零にしてこれを補正信号とする。この
補正信号を、以上の演算処理にかかった時間だけ遅延さ
せた入力映像信号から差し引くことで、入力信号がいか
なる傾きであってもプリシュート、オーバーシュートを
発生させず、かつ縦方向の黒線、白線の幅方向の変化を
起こさずに輪郭部分の傾きを急峻にするものである。With this configuration, the present invention (1) subtracts a signal obtained by delaying an input video signal by a delay circuit from the input video signal, and then, minimizes this signal and a signal obtained by delaying this signal by the delay circuit. The value is taken to obtain a differential signal having the same width as the contour portion. Next, a signal obtained by delaying this differential signal by a delay circuit is subtracted from the original differential signal, and then a preset constant DC voltage is added. The smaller absolute value of this signal and the differential signal is taken, and the polarity of the former signal is used as the correction signal. By subtracting this correction signal from the input video signal delayed by the time required for the above calculation processing, no preshoot or overshoot occurs even if the input signal has any inclination, and the vertical black line , The inclination of the contour portion is made steep without changing the width direction of the white line. (2) A signal obtained by delaying the input video signal by the delay circuit is subtracted from the input video signal, and the minimum value of this signal and the signal obtained by delaying this signal by the delay circuit is taken to obtain the same width as the contour portion. Obtain the differentiated signal. Next, the signal obtained by delaying this differential signal by the delay circuit is subtracted from the original differential signal. After taking the smaller absolute value of this signal and the differential signal,
If the polarity of the former signal is positive, output the signal as it is,
If it is negative, the output is set to zero and this is used as a correction signal. By subtracting this correction signal from the input video signal delayed by the time required for the above calculation processing, no preshoot or overshoot occurs even if the input signal has any inclination, and the vertical black line , The inclination of the contour portion is made steep without changing the width direction of the white line.
【０００９】[0009]
【実施例】以下、本発明の一実施例の輪郭補正装置を
（図１）から（図４）によって説明する。BEST MODE FOR CARRYING OUT THE INVENTION A contour correcting apparatus according to an embodiment of the present invention will be described below with reference to FIGS.
【００１０】（図１）は請求項１の輪郭補正装置の実施
例のブロック図を示すものである。（図１）において、
１は遅延回路であり、入力映像信号ａから、遅延入力映
像信号ｂを得るものである。２は引算回路であり、入力
映像信号ａから遅延入力映像信号ｂを引算し、１次微分
信号ｃを得る。３は遅延回路であり、１次微分信号ｃか
ら遅延１次微分信号ｄを得る。４は最小値回路であり、
１次微分信号ｃと遅延１次微分信号ｄとの最小値を取り
出し、最小値１次微分信号ｅを得る。５、７は遅延回路
であり、最小値１次微分信号ｅから第１の遅延最小値１
次微分信号ｆ、第２の遅延最小値１次微分信号ｈをそれ
ぞれ得る。６は引算回路であり、最小値１次微分信号ｅ
から第１の遅延最小値１次微分信号ｆを引算し、２次微
分信号ｇを得る。１１は加算回路であり、２次微分信号
ｇに一定の値を加算する。FIG. 1 is a block diagram of an embodiment of the contour correcting apparatus according to the first aspect. In (Fig. 1)
Reference numeral 1 denotes a delay circuit which obtains a delayed input video signal b from the input video signal a. A subtraction circuit 2 subtracts the delayed input video signal b from the input video signal a to obtain a primary differential signal c. A delay circuit 3 obtains a delayed primary differential signal d from the primary differential signal c. 4 is a minimum value circuit,
The minimum value of the primary differential signal c and the delayed primary differential signal d is taken out to obtain the minimum value primary differential signal e. Denoted at 5 and 7 are delay circuits, which calculate the first delay minimum value 1 from the minimum first-order differential signal e.
The secondary differential signal f and the second delay minimum value primary differential signal h are respectively obtained. 6 is a subtraction circuit, which is the minimum value first-order differential signal e
From the first delay minimum value primary differential signal f to obtain a secondary differential signal g. An adder circuit 11 adds a constant value to the secondary differential signal g.
【００１１】８は最小値回路であり、２次微分信号ｇに
一定の値を加算した信号ｌと第２の遅延最小値１次微分
信号ｈとの最小値を取り出し、補正信号ｉを得る。９は
遅延回路であり、入力映像信号ａから遅延入力映像信号
ｊを得る。１０は引算回路であり、遅延入力映像信号ｊ
から補正信号ｉを引くことで、出力映像信号ｋを得る。Reference numeral 8 denotes a minimum value circuit, which takes out the minimum value of the signal 1 obtained by adding a constant value to the secondary differential signal g and the second delay minimum value primary differential signal h to obtain the correction signal i. Reference numeral 9 denotes a delay circuit, which obtains a delayed input video signal j from the input video signal a. 10 is a subtraction circuit, which is a delayed input video signal j
An output video signal k is obtained by subtracting the correction signal i from.
【００１２】以上のように構成された輪郭補正装置につ
いて、以下（図２）を用いてその動作について説明す
る。まず、入力映像信号ａを遅延回路１で遅延させて遅
延映像入力信号ｂを得、引算回路２でこの遅延映像入力
信号ｂを入力映像信号ａから引算し、１次微分信号ｃを
得る。次に遅延回路３により、この１次微分信号ｃを遅
延回路１と同じ時間だけ遅延させた遅延１次微分信号ｄ
を得る。その後、最小値回路４で１次微分信号ｃと遅延
１次微分信号ｄの絶対値の小さいほうを選択し、最小値
１次微分信号ｅを得る。ただし、符号が異なっていれば
零を出力する。こうして得られた最小値１次微分信号ｅ
は、必ず入力映像信号ａの輪郭部分の立ち上がりまたは
立ち下がりの時間と同じ幅を持つ。次に、遅延回路５、
７により、この最小値１次微分信号ｅを遅延させ、第１
の遅延最小値１次微分信号ｆおよび第２の遅延最小値１
次微分信号ｈを得る。このとき遅延回路７の遅延時間
は、遅延回路５の遅延時間の１／２である。The operation of the contour correction device having the above-described structure will be described below with reference to FIG. First, the input video signal a is delayed by the delay circuit 1 to obtain the delayed video input signal b, and the subtraction circuit 2 subtracts the delayed video input signal b from the input video signal a to obtain the primary differential signal c. . Next, the delay circuit 3 delays the first-order differential signal c by the same time as the delay circuit 1 to obtain a delayed first-order differential signal d.
To get Then, the minimum value circuit 4 selects the smaller absolute value of the primary differential signal c and the delayed primary differential signal d to obtain the minimum primary differential signal e. However, if the signs are different, zero is output. Minimum value first derivative signal e thus obtained
Always has the same width as the rising or falling time of the contour portion of the input video signal a. Next, the delay circuit 5,
7, the minimum first-order differential signal e is delayed to
Delay minimum value first derivative signal f and second delay minimum value 1
The second derivative signal h is obtained. At this time, the delay time of the delay circuit 7 is 1/2 of the delay time of the delay circuit 5.
【００１３】次に、引算回路６で最小値１次微分信号ｅ
から第１の遅延最小値１次微分信号ｆを引算し、２次微
分信号ｇを得る。次に加算回路１１で、ある一定の値を
２次微分信号ｇに加え、補正２次微分信号ｌを得る。次
いで最小値回路８で補正２次微分信号ｌと第２の遅延最
小値１次微分信号ｈの絶対値の小さいほうを選択し、補
正信号ｉを得る。ただし、符号は２次微分信号ｇと同じ
符号を用いる。次に引算回路１０により、この補正信号
ｉを、以上の処理にかかった時間だけ入力映像信号ａを
遅延させた信号ｊから差し引くことにより出力映像信号
ｋを得る。この信号ｋは、必ず入力映像信号ａの輪郭部
分の立ち上がりまたは立ち下がりの急峻さに比例して輪
郭補正がなされたものになり、かつ入力映像信号ａより
立ち上がっている部分の時間が補正前の信号より若干短
いものになる。これによりプリシュート、オーバーシュ
ートを付けず、かつ実際に画面上で見て黒部分と白部分
の幅を変えずに輪郭補正が行える。Next, in the subtraction circuit 6, the minimum value first-order differential signal e
From the first delay minimum value primary differential signal f to obtain a secondary differential signal g. Next, the addition circuit 11 adds a certain value to the secondary differential signal g to obtain a corrected secondary differential signal l. Next, the minimum value circuit 8 selects the smaller absolute value of the corrected secondary differential signal 1 and the second delay minimum value primary differential signal h to obtain the corrected signal i. However, the same sign as the second derivative signal g is used. Next, the subtraction circuit 10 subtracts the correction signal i from the signal j obtained by delaying the input video signal a by the time taken for the above processing to obtain the output video signal k. This signal k is always the one in which the contour correction is performed in proportion to the steepness of the rising or falling of the contour portion of the input video signal a, and the time of the portion rising from the input video signal a is before correction. It will be slightly shorter than the signal. This makes it possible to perform contour correction without adding preshoot and overshoot, and without actually changing the widths of the black portion and the white portion on the screen.
【００１４】（図３）は請求項２の輪郭補正装置の実施
例のブロック図を示すものである。（図３）の各構成要
素のうち（図１）と同一の番号を付したものについては
（図１）の説明と同一であるので詳しい説明を省略す
る。最小値回路８は、２次微分信号ｇと第２の遅延最小
値１次微分信号ｈとの最小値を取り出し、補正信号ｉを
得るものである。１２は制限回路であり、最小値回路８
の出力である補正信号ｉについて、正極性であればその
まま出力し、負極性であればその出力を零にするもので
ある。引算回路１０は、制限回路１２の出力を遅延回路
９の出力信号から差し引いた信号を出力映像信号ｋとし
て出力するものである。FIG. 3 shows a block diagram of an embodiment of the contour correcting apparatus according to the present invention. Of the respective constituent elements of (FIG. 3), those denoted by the same reference numerals as those of (FIG. 1) are the same as those of (FIG. 1), and detailed description thereof will be omitted. The minimum value circuit 8 extracts the minimum value of the secondary differential signal g and the second delay minimum value primary differential signal h to obtain the correction signal i. Reference numeral 12 is a limiting circuit, which is a minimum value circuit 8
With respect to the correction signal i which is the output of the above, if it has a positive polarity, it is output as it is, and if it has a negative polarity, its output is made zero. The subtraction circuit 10 outputs a signal obtained by subtracting the output of the limiting circuit 12 from the output signal of the delay circuit 9 as an output video signal k.
【００１５】以上のように構成された輪郭補正装置につ
いて、以下（図４）を用いてその動作について説明す
る。入力映像信号ａから２次微分信号ｇを得るまでの過
程は前述の（図２）を用いた説明と同一である。これに
続いて、最小値回路８で２次微分信号ｇと第２の遅延最
小値１次微分信号ｈの絶対値の小さいほうを選択し、補
正信号ｉを得る。ただし、符号は２次微分信号ｇと同じ
符号を用いる。次に制限回路１２によって、補正信号ｉ
の負符号部分の信号を零にした信号ｍを得る。次に引算
回路１０により、この信号ｍを、補正信号の生成にかか
った時間だけ入力映像信号ａを遅延させた信号ｊから差
し引くことにより出力映像信号ｋを得る。この信号ｋ
は、入力映像信号ａの輪郭部分の黒側の縁のみが急峻に
なったものになる。これによりプリシュート、オーバー
シュートを付けず、かつ実際に画面上で見て黒部分と白
部分の幅を変えずに輪郭補正が行える。The operation of the contour correction device configured as described above will be described below with reference to FIG. The process of obtaining the secondary differential signal g from the input video signal a is the same as the description using (FIG. 2) described above. Following this, the minimum value circuit 8 selects the smaller absolute value of the secondary differential signal g and the second delay minimum value primary differential signal h to obtain the correction signal i. However, the same sign as the second derivative signal g is used. Next, the limiting circuit 12 causes the correction signal i
A signal m in which the signal of the negative sign portion of is zero is obtained. Next, the subtraction circuit 10 subtracts this signal m from the signal j obtained by delaying the input video signal a by the time taken to generate the correction signal to obtain the output video signal k. This signal k
Shows that only the black edge of the contour portion of the input video signal a is steep. This makes it possible to perform contour correction without adding preshoot and overshoot, and without actually changing the widths of the black portion and the white portion on the screen.
【００１６】以上のように本実施例によれば、入力信号
の輪郭部分の立ち上がりまたは立ち下がりの急峻差を輪
郭補正後においても維持し、かつ実際の画面上で見て横
方向の黒白部分の幅を変えず、プリシュート、オーバー
シュートなしに、より急峻で幅の狭い輪郭補正を行うこ
とができる。As described above, according to this embodiment, the steep difference between the rising edge and the falling edge of the contour portion of the input signal is maintained even after the contour correction, and the black and white portion in the horizontal direction is actually seen on the screen. A sharper and narrower contour correction can be performed without changing the width and without preshooting or overshooting.
【００１７】[0017]
【発明の効果】以上のように本発明は、遅延回路、引算
回路、加算回路、最小値回路さらには制限回路を用いる
ことによって、入力映像信号の輪郭部分の傾きから、輪
郭部分の立ち上がりまたは立ち下がり時間と同じ時間幅
の補正信号が作られ、さらにブラウン管の特性を考慮
し、画面上で見て輪郭部における黒部分、白部分の幅を
変化させることなく、かつプリシュート、オーバーシュ
ートなしに、映像の輪郭を細く急峻に補正することで画
質の向上が図れ、その実用的効果は大なるものがある。As described above, according to the present invention, the delay circuit, the subtraction circuit, the addition circuit, the minimum value circuit, and the limiting circuit are used to change the rising edge of the contour portion from the inclination of the contour portion of the input video signal. A correction signal with the same time width as the fall time is created, and in consideration of the characteristics of the cathode ray tube, there is no preshoot or overshoot without changing the width of the black and white parts in the contour part when viewed on the screen. In addition, the image quality can be improved by correcting the contour of the image finely and sharply, and its practical effect is great.
【図１】本発明の請求項１の実施例における輪郭補正装
置のブロック図FIG. 1 is a block diagram of a contour correction device according to an embodiment of claim 1 of the present invention.
【図２】請求項１の実施例の動作を説明するための波形
図FIG. 2 is a waveform diagram for explaining the operation of the embodiment of claim 1.
【図３】本発明の請求項２の実施例における輪郭補正装
置のブロック図FIG. 3 is a block diagram of a contour correction device according to a second embodiment of the present invention.
【図４】請求項２の実施例の動作を説明するための波形
図FIG. 4 is a waveform chart for explaining the operation of the embodiment of claim 2;
【図５】従来例の輪郭補正装置のブロック図FIG. 5 is a block diagram of a conventional contour correction device.
【図６】従来例の動作を説明するための波形図FIG. 6 is a waveform diagram for explaining the operation of the conventional example.
１、３、５、７、９ 遅延回路 ２、６、１０ 引算回路 ４、８ 最小値回路 １１ 加算回路 １２ 制限回路 1, 3, 5, 7, 9 delay circuit 2, 6, 10 subtraction circuit 4, 8 Minimum value circuit 11 adder circuit 12 Limiting circuit
Claims (2)
延回路と、第１の遅延回路より得られた信号を上記入力
された映像信号から引算する第１の引算回路と、第１の
引算回路の出力信号を遅延する第２の遅延回路と、第２
の遅延回路により得られた信号と第１の引算回路の出力
信号との小さいほうを出力する第１の最小値回路と、第
１の最小値回路の出力信号を遅延する第３の遅延回路
と、第３の遅延回路により得られた信号を第１の最小値
回路の出力信号から引算する第２の引算回路と、第２の
引算回路の出力信号にある一定の直流電圧を加算する加
算回路と、第１の最小値回路の出力信号を遅延する第４
の遅延回路と、加算回路の出力信号と第４の遅延回路の
出力信号との絶対値の小さいほうを出力する第２の最小
値回路と、入力された映像信号を遅延する第５の遅延回
路と、第５の遅延回路の出力信号から第２の最小値回路
の出力信号を引算する第３の引算回路を備えた輪郭補正
装置。1. A first delay circuit for delaying an input video signal; a first subtraction circuit for subtracting a signal obtained from the first delay circuit from the input video signal; A second delay circuit for delaying the output signal of the first subtraction circuit;
First minimum value circuit for outputting the smaller of the signal obtained by the delay circuit and the output signal of the first subtraction circuit, and a third delay circuit for delaying the output signal of the first minimum value circuit And a second subtraction circuit for subtracting the signal obtained by the third delay circuit from the output signal of the first minimum value circuit, and a constant DC voltage in the output signal of the second subtraction circuit. An adder circuit for adding and a fourth delay circuit for delaying the output signal of the first minimum value circuit
Delay circuit, a second minimum value circuit for outputting the smaller absolute value of the output signal of the adder circuit and the output signal of the fourth delay circuit, and a fifth delay circuit for delaying the input video signal. And a third subtraction circuit for subtracting the output signal of the second minimum value circuit from the output signal of the fifth delay circuit.
延回路と、第１の遅延回路より得られた信号を上記入力
された映像信号から引算する第１の引算回路と、第１の
引算回路の出力信号を遅延する第２の遅延回路と、第２
の遅延回路より得られた信号と第１の引算回路の出力信
号との小さいほうを出力する第１の最小値回路と、第１
の最小値回路の出力信号を遅延する第３の遅延回路と、
第３の遅延回路より得られた信号を第１の最小値回路の
出力信号から引算する第２の引算回路と、第１の最小値
回路の出力信号を遅延する第４の遅延回路と、第２の加
算回路の出力信号と第４の遅延回路の出力信号との絶対
値の小さいほうを出力する第２の最小値回路と、第２の
最小値回路の出力信号が入力され、その信号の極性が正
方向であればそのまま通過し、負方向であればその出力
を零とする制限回路と、入力された映像信号を遅延する
第５の遅延回路と、第５の遅延回路の出力信号から制限
回路の出力信号を引算する第３の引算回路を備えた輪郭
補正装置。2. A first delay circuit for delaying an input video signal, a first subtraction circuit for subtracting a signal obtained from the first delay circuit from the input video signal, A second delay circuit for delaying the output signal of the first subtraction circuit;
A first minimum value circuit for outputting the smaller of the signal obtained from the delay circuit and the output signal of the first subtraction circuit;
A third delay circuit for delaying the output signal of the minimum value circuit of
A second subtraction circuit that subtracts the signal obtained from the third delay circuit from the output signal of the first minimum value circuit; and a fourth delay circuit that delays the output signal of the first minimum value circuit. , A second minimum value circuit that outputs the smaller absolute value of the output signal of the second adder circuit and the output signal of the fourth delay circuit, and the output signal of the second minimum value circuit are input. If the polarity of the signal is in the positive direction, it will pass through as it is, and if it is in the negative direction, it will be passed through as it is, and the output will be zero, a fifth delay circuit for delaying the input video signal, and the output of the fifth delay circuit. A contour correction device comprising a third subtraction circuit for subtracting the output signal of the limiting circuit from the signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3164340A JP2940229B2 (en) | 1991-07-04 | 1991-07-04 | Contour correction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3164340A JP2940229B2 (en) | 1991-07-04 | 1991-07-04 | Contour correction device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0514771A true JPH0514771A (en) | 1993-01-22 |
| JP2940229B2 JP2940229B2 (en) | 1999-08-25 |
Family
ID=15791314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3164340A Expired - Fee Related JP2940229B2 (en) | 1991-07-04 | 1991-07-04 | Contour correction device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2940229B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6206330B1 (en) | 1997-03-18 | 2001-03-27 | Togo Seisakusyo Corporation | Pipe clamp |
| WO2002093907A1 (en) * | 2001-05-11 | 2002-11-21 | Matsushita Electric Industrial Co., Ltd. | Video signal contour corrector |
-
1991
- 1991-07-04 JP JP3164340A patent/JP2940229B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6206330B1 (en) | 1997-03-18 | 2001-03-27 | Togo Seisakusyo Corporation | Pipe clamp |
| WO2002093907A1 (en) * | 2001-05-11 | 2002-11-21 | Matsushita Electric Industrial Co., Ltd. | Video signal contour corrector |
| US7002636B2 (en) | 2001-05-11 | 2006-02-21 | Matsushita Electric Industrial Co., Ltd. | Video signal contour corrector |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2940229B2 (en) | 1999-08-25 |
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