JPH03229583A - Scanning line interpolation circuit - Google Patents

Scanning line interpolation circuit

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Publication number
JPH03229583A
JPH03229583A JP2024613A JP2461390A JPH03229583A JP H03229583 A JPH03229583 A JP H03229583A JP 2024613 A JP2024613 A JP 2024613A JP 2461390 A JP2461390 A JP 2461390A JP H03229583 A JPH03229583 A JP H03229583A
Authority
JP
Japan
Prior art keywords
sample
circuit
sample points
interpolation
line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2024613A
Other languages
Japanese (ja)
Inventor
Takuji Kurashita
蔵下 拓二
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2024613A priority Critical patent/JPH03229583A/en
Publication of JPH03229583A publication Critical patent/JPH03229583A/en
Pending legal-status Critical Current

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  • Color Television Systems (AREA)
  • Television Systems (AREA)

Abstract

PURPOSE:To interpolate a scanning line without deteriorating picture quality even in the edge part of a picture in which an oblique edge exists by changing an interpolating method according to the correlation of the pictures in a vertical and an oblique directions. CONSTITUTION:Sample points R1101 and R6106, R2102 and R5105, R3103 and R4104 are inputted to correlation detection circuits 6a, 6b, 6c respectively, and differential absolute values Ta113, Tb114, Tc115 are obtained, and the correlation is obtained, and is inputted to a decision circuit 7a, and switches a switch circuit 8a. Namely, the switch circuit is switched so that an interpolation signal is obtained on the basis of the sample point in the oblique direction of the same direction when the sample point only in the oblique direction is strong, and in other cases, the interpolation signal is obtained on the basis of the sample point in the vertical direction. However, at that time, when the remarked sample point to be interpolated is decided to be an isolated point by an isolated point removal circuit 10a, a control signal 116 is sent to the switch circuit 8a after it is corrected.

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は、飛び越し走査されたテレビジョン信号を順
次走査にするための走査線補間回路に関し、特にフィー
ルド内で補間する走査線補間回路に関するものである。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a scanning line interpolation circuit for sequentially scanning an interlaced television signal, and particularly to a scanning line interpolation circuit for interpolating within a field. It is.

[従来の技術] 動き適応走査線補間は、静止画では前フィールドの走査
線をそのまま補間走査線としているが、動画では上ある
いは上下のラインから補間走査線を求めるフィールド内
補間となっている。
[Prior Art] Motion adaptive scan line interpolation uses the scan line of the previous field as the interpolation scan line for still images, but for moving images, it uses intra-field interpolation to obtain interpolation scan lines from the upper or lower lines.

第5図は従来のフィールド内走査線補間回路を示すブロ
ック図である。
FIG. 5 is a block diagram showing a conventional intra-field scanning line interpolation circuit.

図において、入力端子(1b)には標本化されたディジ
タル信号列が入力される。入力端子(1b)から入力さ
れた信号(201)はlライン遅延回路(9b)にて1
ライン遅延され、加算回路(4d)で入力信号(201
)と加算される。加算回路(4d)の出力(203)は
乗算回路(5d)で1/2倍され、フィールド内袖開信
号として出力端子(2b)より送出される。
In the figure, a sampled digital signal sequence is input to the input terminal (1b). The signal (201) input from the input terminal (1b) is input to the l line delay circuit (9b).
The input signal (201
) is added. The output (203) of the adder circuit (4d) is multiplied by 1/2 by the multiplier circuit (5d) and sent out from the output terminal (2b) as an in-field sleeve open signal.

次に動作について第6図を用いて説明する。Next, the operation will be explained using FIG. 6.

第6図は実走査線および補間走査線の標本点列の画面上
での配列を示す図であり、入力端子(lb)より入力さ
れた実走査線の標本点列(R1−11,)および補間さ
れた走査線の標本点列(1,〜I3)の画面上での配列
を示している。
FIG. 6 is a diagram showing the arrangement of sample point sequences of the actual scanning line and interpolated scanning line on the screen, and shows the sample point sequence (R1-11,) of the actual scanning line input from the input terminal (lb) and It shows the arrangement of interpolated scanning line sample point sequences (1, to I3) on the screen.

ここで、標本点■2を求めることを考える。Now, consider finding sample point ■2.

入力端子(lb)より入力された信号はlライン遅延回
路(9b)を通過するので、2ライン分の標本点が同時
に得られることになる。これら2つの標本点(201)
、  (202)は加算回路(4d)および乗算回路(
5d)で平均をとられ、補間信号として出力端子(2b
)より送出される。すなわち、補間標本点I2は標本点
R2、R、sをもとに以下の式にて得ることができる。
Since the signal input from the input terminal (lb) passes through the l-line delay circuit (9b), sample points for two lines are obtained simultaneously. These two sample points (201)
, (202) is an addition circuit (4d) and a multiplication circuit (
5d) and output terminal (2b) as an interpolated signal.
). That is, the interpolated sample point I2 can be obtained using the following equation based on the sample points R2, R, and s.

R2+  R5 2 [発明が解決しようとする課題] 従来のフィールド内走査線補間回路は、以上のように構
成されているので、斜めエツジ部で画質が劣化する(第
7図)という問題点があった。
R2+R5 2 [Problems to be Solved by the Invention] Since the conventional intra-field scanning line interpolation circuit is configured as described above, there is a problem that image quality deteriorates at diagonal edge portions (Fig. 7). Ta.

この発明は上記のような問題点を解消するためになされ
たもので、斜めエツジがある場合でも画質を劣化させる
ことな(、フィールド内で走査線補間が行える回路を得
ることを目的とする。
The present invention has been made to solve the above-mentioned problems, and its object is to provide a circuit that can perform scanning line interpolation within a field without degrading the image quality even when there are diagonal edges.

[課題を解決するための手段] この発明に係わるフィールド内の走査線補間回路は、入
力信号を遅延して、画面上垂直方向に2ライン並ぶ標本
点の標本値を同時に得るための遅延手段と、前記得られ
た標本点を各々遅延して、画面上水平方向に3標本点づ
つ並ぶ標本点の標本値を前記垂直方向に2ライン並ぶ標
本点の標本値と同時に得る手段と、上記6つの標本点を
画面上上のラインの左からβ標本点を第1、第2、第3
の標本点とし、画面上下のラインの左から3標本点を第
4、第5、第6の標本点とし、第1と第6、第2と第5
、第3と第4の標本点の標本値の平均値および相関を検
出する手段と、前記3つの標本値の平均値を入力とし、
これらを切り換えて出力するスイッチ回路と、前記3つ
の標本値の相関検出結果を入力とし、相関検出結果に応
じて前記スイッチ回路の切り替えを制御する信号を送出
する判定回路と、前記判定回路の判定結果が、補間する
注目標本点の画面上lライン上下、1画素左右の補間標
本点の判定結果から孤立点であると判断した場合に1ラ
イン上下あるいは1画素左右の補間標本点の判定結果に
置き換える孤立点除去回路とを備えたものである。
[Means for Solving the Problems] An in-field scanning line interpolation circuit according to the present invention includes a delay means for delaying an input signal and simultaneously obtaining sample values of sample points arranged in two vertical lines on a screen. , means for delaying each of the obtained sample points to simultaneously obtain the sample values of the sample points arranged horizontally on the screen in rows of three sample points, and the sample values of the sample points arranged vertically in two lines; Set the sample points to the 1st, 2nd, and 3rd sample points from the left of the line on the screen.
The three sample points from the left of the line at the top and bottom of the screen are the fourth, fifth, and sixth sample points.
, means for detecting the average value and correlation of the sample values of the third and fourth sample points, and the average value of the three sample values as input,
A switch circuit that switches and outputs these, a determination circuit that receives the correlation detection results of the three sample values as input and sends out a signal that controls switching of the switch circuit according to the correlation detection results, and a determination circuit that makes a decision in the determination circuit. If the result is determined to be an isolated point based on the judgment result of the interpolation sample point one line above and below the target sample point to be interpolated and one pixel left and right on the screen, the judgment result of the interpolation sample point one line above and below or one pixel to the left and right will be displayed. It is equipped with a replacement isolated point removal circuit.

いわば、補間する注目標本点に隣接する標本点の垂直方
向、斜め方向の相関を求めて、相関の強さに応じて補間
に使う標本点を切り換えて補間を行うようにしたもので
ある。また、このとき上記相関結果が、孤立点である場
合はその相関結果を修正するようにした。
In other words, the correlation in the vertical and diagonal directions of sample points adjacent to the sample point of interest to be interpolated is determined, and the sample points used for interpolation are switched depending on the strength of the correlation to perform interpolation. Further, at this time, if the above correlation result is an isolated point, the correlation result is corrected.

[作用] この発明におけるフィールド内の走査線補間回路は、上
記のように垂直方向、斜め方向の画像の相関により補間
方法を切り換えるので、斜めのエツジがある画像のエツ
ジ部でも画質を劣化することなく走査線補間を行うこと
ができる。
[Function] Since the in-field scanning line interpolation circuit of the present invention switches the interpolation method depending on the correlation between images in the vertical direction and the diagonal direction as described above, the image quality is not degraded even at the edge portion of an image with diagonal edges. Scan line interpolation can be performed without

[実施例] 以下、この発明を図について説明する。[Example] The invention will be explained below with reference to the drawings.

第1図はこの発明の一実施例である走査線補間回路を示
すブロック図である。
FIG. 1 is a block diagram showing a scanning line interpolation circuit according to an embodiment of the present invention.

図において、入力端子(la)より入力されたディジタ
ル信号列 (101)は1サンプル遅延回路(3a)、
 (3b)によりlサンプルづつ順次遅延される。また
、入力信号(101)はlライン遅延回路(9a)によ
りlライン遅延された後、lサンプル遅延回路(3c)
’、 (3d)に順次入力され、lサンプルづつ遅延さ
れる。lサンプル遅延回路(3a)、 (3c)の出力
(102) 、(105)は加算回路(4a)で加算さ
れ乗算回路(5a)で1/2倍されたのちスイッチ回路
(8a)の第1の入力端に入力される。入力信号(10
1)はまたlサンプル遅延回路(3d)の出力(106
)とともに加算回路(4b)で加算され、出力(109
)は乗算回路(5b)で1/2倍されたのちスイッチ回
路(8a)の第2の入力端に入力される。lライン遅延
回路(9a)の出力(+04)はまた1サンプル遅延回
路(3b)の出力(103)とともに加算回路(4C)
で加算され、出力(II+)は乗算回路(5c)で1/
2倍されたのちスイッチ回路(8a)の第3の入力端に
入力される。
In the figure, a digital signal string (101) input from an input terminal (la) is connected to a 1-sample delay circuit (3a),
(3b), the signal is sequentially delayed by l samples. In addition, the input signal (101) is delayed by l lines by the l line delay circuit (9a), and then sent to the l sample delay circuit (3c).
', (3d) are input sequentially and delayed by l samples. The outputs (102) and (105) of the l-sample delay circuits (3a) and (3c) are added in the adder circuit (4a), multiplied by 1/2 in the multiplier circuit (5a), and then sent to the first switch circuit (8a). is input to the input terminal of Input signal (10
1) is also the output (106) of the l sample delay circuit (3d).
) together with the adder circuit (4b), and the output (109
) is multiplied by 1/2 by the multiplier circuit (5b) and then input to the second input terminal of the switch circuit (8a). The output (+04) of the l-line delay circuit (9a) is also connected to the adder circuit (4C) together with the output (103) of the 1-sample delay circuit (3b).
The output (II+) is multiplied by 1/ by the multiplier circuit (5c).
After being doubled, it is input to the third input terminal of the switch circuit (8a).

方、入力信号(101)と1サンプル遅延回路(3d)
の出力(106)は相関検出回路(6a)に入力され、
1サンプル遅延回路 (3a)、 (3c)の出力(+
02)(105)は相関検出回路(6b)に入力され、
1ライン遅延回路(9a)の出力(104)と1サンプ
ル遅延回路(3b)の出力(103)は相関検出回路(
6C)に入力される。各相関検出回路(6a)、 (6
b)、 (6c)の相関検出結果出力(+13)、 (
114)、 (+15)はともに判定回路(7a)に入
力され、判定回路(7a)の出力(114)は孤立点除
去回路(]Oa)を介して制御信号としてスイッチ回路
(8a)の第4の入力端に入力される。スイッチ回路(
8a)の出力(117)は走査線補間信号として出力端
子(2a)より送出される。
On the other hand, input signal (101) and 1 sample delay circuit (3d)
The output (106) is input to the correlation detection circuit (6a),
1 sample delay circuit (3a), (3c) output (+
02) (105) is input to the correlation detection circuit (6b),
The output (104) of the 1-line delay circuit (9a) and the output (103) of the 1-sample delay circuit (3b) are connected to the correlation detection circuit (
6C). Each correlation detection circuit (6a), (6
b), (6c) correlation detection result output (+13), (
114) and (+15) are both input to the judgment circuit (7a), and the output (114) of the judgment circuit (7a) is sent to the fourth switch circuit (8a) as a control signal via the isolated point removal circuit (]Oa). is input to the input terminal of Switch circuit (
The output (117) of 8a) is sent out from the output terminal (2a) as a scanning line interpolation signal.

第2図は第1図における孤立点除去回路(108)の一
実施例を示すブロック図である。
FIG. 2 is a block diagram showing an embodiment of the isolated point removal circuit (108) in FIG. 1.

図において、入力信号(116)はlサンプル遅延回路
(3e)を介して、比較回路 (11a)の一方の入力
端に入力されるとともに、lライン遅延回路(9C)(
9d)およびlサンプル遅延回路(3f)を介して、比
較回路(lla)の他方の入力端に入力される。
In the figure, an input signal (116) is input to one input terminal of a comparator circuit (11a) via an l sample delay circuit (3e), and an l line delay circuit (9C) (
9d) and the l-sample delay circuit (3f) to the other input terminal of the comparison circuit (lla).

また、lライン遅延回路(9C)の出力(120)は比
較回路(llb)の一方の入力端に入力されるとともに
、2サンプル遅延回路(3h)を介して、比較回路(l
lb)の他方の入力端に入力される。さらに、lライン
遅延回路(9C)の出力(120)はlサンプル遅延回
路(3g)を介して、比較回路(I Ia) 、 (l
 lb)の出力(+24)、 (+25)とともに選択
回路(12a)に入力される。選択回路(12a)の出
力(118)は孤立点除去回路出力として送出される。
Further, the output (120) of the l line delay circuit (9C) is input to one input terminal of the comparator circuit (llb), and is also inputted to one input terminal of the comparator circuit (llb) via the 2 sample delay circuit (3h).
lb) is input to the other input terminal. Furthermore, the output (120) of the l line delay circuit (9C) is passed through the l sample delay circuit (3g) to the comparison circuit (I Ia), (l
lb) is input to the selection circuit (12a) together with the outputs (+24) and (+25). The output (118) of the selection circuit (12a) is sent out as the isolated point removal circuit output.

次に動作について第6図を用いて説明する。Next, the operation will be explained using FIG. 6.

入力端子(1a)より入力された信号 (lot)は、
1ライン遅延回路(9a)、  lサンプル遅延回路(
3a)、(3b) (3c)、(3d)により水平方向
3サンプルの標本点が2ライン分同時に得られる。第6
図を例にとれば、実走査線上の標本点R,,R2R6が
得られたことになる。
The signal (lot) input from the input terminal (1a) is
1 line delay circuit (9a), l sample delay circuit (
3a), (3b), (3c), and (3d), three sample points in the horizontal direction are obtained simultaneously for two lines. 6th
Taking the figure as an example, sample points R, , R2R6 on the actual scanning line are obtained.

これらの標本点R,,R2,・・、R6をもとにI2を
求めることを考える。
Consider finding I2 based on these sample points R,, R2, . . . , R6.

まず、実走査線の標本点から以下の3種の補間出力I 
2.(+10)、 T 、、(108)、 I 2.(
112)を求める。
First, the following three types of interpolation output I from the sample points of the actual scanning line
2. (+10), T,, (108), I 2. (
112).

■ (112) このようにして得られた補間出力■ 2、(110)。■ (112) Interpolated output obtained in this way■ 2, (110).

I 2.(108)、 I 2e(112)はそれぞれ
スイッチ回路(8a)に送出され、制御信号(118)
により切り換えられて出力される。
I 2. (108) and I2e (112) are sent to the switch circuit (8a), respectively, and the control signal (118)
is switched and output.

ここで、上記3種の補間出力を切り換える動作について
説明する。標本点R,(101)とR6(106)R2
(+02)とR5(105)、 R3(103)とR、
(104)はそれぞれ相関検出回路(6a)、 (6b
)、 (6c)に入力される。
Here, the operation of switching between the above three types of interpolation output will be explained. Sample points R, (101) and R6 (106) R2
(+02) and R5 (105), R3 (103) and R,
(104) are correlation detection circuits (6a) and (6b), respectively.
), (6c).

相関検出回路(6a)、 (6b)、 (6c)では次
式のごとく差分絶対値T 、(113)、T、(114
)、Tc(115)が求められ、相関が検出される。
In the correlation detection circuits (6a), (6b), and (6c), the absolute difference values T , (113), T, (114
), Tc (115) are determined and the correlation is detected.

T、 =  l R,−R61(11,3)T、 = 
 l R2−R61(114)T、 =  l R,−
R41(115)上記T 、(113)、T、(114
)、Te(115)は、判定回路(7a)に入力され、
判定回路(7a)では以下の条件にてスイッチ回路(8
a)を切り換えるような制御信号を送出する。
T, = l R, -R61(11,3)T, =
l R2-R61(114)T, = l R,-
R41 (115) above T , (113), T, (114
), Te (115) are input to the determination circuit (7a),
The determination circuit (7a) detects the switch circuit (8) under the following conditions.
Send a control signal to switch a).

(1)T、<T、かつT、<Te 2−I2− (2)T、<T、かつTcくT11 12=I2b (3)上記以外 1 2 =I  2e すなわち、斜め一方向のみの標本点が強いときは、その
同方向の斜め方向の標本点により補間信号を求め、それ
以外の時は上下の方向の標本点により補間信号を求める
ように切り換える。ただしこの時、補間する注目標本点
が孤立点除去回路(10a)により、孤立点と判断され
た場合は前記制御信号(116)を修正した後スイッチ
回路 (lOa)に送出される。
(1) T, < T, and T, < Te 2-I2- (2) T, < T, and Tc < T11 12 = I2b (3) Other than the above 1 2 = I 2e In other words, a sample in only one diagonal direction When the point is strong, the interpolation signal is determined by using the sample point in the diagonal direction in the same direction, and in other cases, the interpolation signal is determined by using the sample point in the vertical direction. However, at this time, if the sample point of interest to be interpolated is determined to be an isolated point by the isolated point removal circuit (10a), the control signal (116) is corrected and then sent to the switch circuit (lOa).

以下、この孤立点除去回路(10a)の動作について第
7図を用いて説明する。孤立点除去回路 (+、Oa)
に入力された信号(116)は、■ライン遅延回路(9
c)、 (9d)、1サンプル遅延回路(3e)、 (
3f)、 (3g)および2サンプル遅延回路(3e)
により第4図における注目補間標本点S (126)お
よび隣接補間標本点S、(122)、  52(123
)、  S、(120)、  54(119)における
前記制御信号が同時に得られる。比較回路(I la)
は、もし補間標本点S 2(123)と53(120)
の補間の方向が同じならば、注目補間標本点の補間の方
向は、その方向であると判定し、注目補間標本点の制御
信号を修正する。また、比較回路(llb)は、もし補
間標本点S 、(122)とS 、(119)の補間の
方向が同じならば、注目補間標本点の補間の方向は、そ
の方向であると判定し、注目補間標本点の制御信号を修
正する。両方の比較回路において、修正がされなかった
場合、注目補間標本点の制御信号は、そのまま出力され
るように選択回路(12a)は制御し、2つの修正がな
された場合は、いずれかの修正が優先されるように制御
し出力する。
The operation of this isolated point removal circuit (10a) will be described below with reference to FIG. Isolated point removal circuit (+, Oa)
The signal (116) input to the ■ line delay circuit (9
c), (9d), 1 sample delay circuit (3e), (
3f), (3g) and 2 sample delay circuit (3e)
Therefore, the interpolated sample point of interest S (126) and adjacent interpolated sample points S, (122), 52 (123) in Fig. 4 are obtained.
), S, (120), and 54 (119) are obtained simultaneously. Comparison circuit (I la)
If the interpolated sample points S 2 (123) and 53 (120)
If the direction of interpolation is the same, the direction of interpolation of the interpolation sample point of interest is determined to be that direction, and the control signal of the interpolation sample point of interest is corrected. Furthermore, if the interpolation direction of the interpolation sample point S , (122) and S , (119) is the same, the comparison circuit (llb) determines that the interpolation direction of the interpolation sample point of interest is that direction. , modify the control signal of the interpolated sample point of interest. In both comparison circuits, if no correction is made, the selection circuit (12a) controls so that the control signal of the interpolation sample point of interest is output as is; if two corrections are made, either one of the corrections is output. control and output so that priority is given to

なお、上記実施例では、補間標本点を求めるために補間
走査線の上下の実、走査線の標本点を3点づつしか取ら
なかったが、もっと多くの標本点により補間標本点を求
めれば、さらに精度のよい補間が行えることは言うまで
もない。
Note that in the above embodiment, only three sample points were taken on each of the upper and lower sides of the interpolation scanning line to obtain the interpolation sample points, but if the interpolation sample points were obtained using more sample points, even more Needless to say, highly accurate interpolation can be performed.

[発明の効果] 以上のように、この発明によれば、第3図のごとく斜め
エツジのある画像においても、エツジ部で画質を劣化す
ることなくフィールド内で走査線補間を行うことができ
る。
[Effects of the Invention] As described above, according to the present invention, even in an image with diagonal edges as shown in FIG. 3, scanning line interpolation can be performed within the field without deteriorating the image quality at the edge portions.

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

第1図はこの発明の一実施例による走査線補間回路を示
すブロック図、第2図は第1図における孤立点除去回路
の一実施例を示すブロック図、第第3図はこの発明によ
る走査線補間回路による走査線の補間を説明する図、第
4図は補間走査線の標本点列の画面上での配列を示す図
、第5図は従来の走査線補間回路を示すブロック図、第
6図は実走査線および補間走査線の標本点列の画面上で
の配列を示す図、第7図は従来の走査線補間回路による
走査線の補間を説明する図である。 (la)、 (lb) ・−・入力端子、(2a)、 
(2b) ・・出力端子、(3a)〜(3g)・・・l
サンプル遅延回路、(3h)・・・2サンプル遅延回路
、(4a) 〜(4d) ・−・加算回路、(5a)〜
(5d)・・乗算回路、(6a)〜(6c)・・・相関
検出回路、(7a)・・判定回路、(8a)・スイッチ
回路、(9a)〜(9d)−1ライン遅延回路、(lo
a)・・・孤立点除去回路、 (lla)、 (Ilb
)−比較回路、(12a) −選択回路なお、各図中、
同一符号は同一、又は相当部分を示す。 第 図 第 3 図 (a)画像の走査線 (b)上記■0■の振幅レベル・ 第 図 S、5t−34:補間走査点の標本点 第 5 図 2 3 R1−R6:実走査線の標本点 11〜13:補同走査腺の標本点 第 図 (a)画像の走査線 (b)上記■O■の振幅レベル 時間 手続補正書 (自発)
FIG. 1 is a block diagram showing a scanning line interpolation circuit according to an embodiment of the present invention, FIG. 2 is a block diagram showing an embodiment of the isolated point removal circuit in FIG. FIG. 4 is a diagram illustrating the interpolation of scanning lines by a line interpolation circuit. FIG. 4 is a diagram showing the arrangement of a sample point sequence of an interpolated scanning line on the screen. FIG. FIG. 6 is a diagram showing the arrangement of sample point sequences of actual scanning lines and interpolated scanning lines on the screen, and FIG. 7 is a diagram illustrating interpolation of scanning lines by a conventional scanning line interpolation circuit. (la), (lb) ---input terminal, (2a),
(2b)...output terminal, (3a)-(3g)...l
Sample delay circuit, (3h)...2 sample delay circuit, (4a) to (4d) --Addition circuit, (5a) to
(5d) Multiplication circuit, (6a) to (6c) Correlation detection circuit, (7a) Judgment circuit, (8a) Switch circuit, (9a) to (9d) -1 line delay circuit, (lo
a)...Isolated point removal circuit, (lla), (Ilb
) - Comparison circuit, (12a) - Selection circuit In each figure,
The same reference numerals indicate the same or equivalent parts. Figure 3 (a) Image scanning line (b) Amplitude level of above ■0■ Figure S, 5t-34: Sample point 5 of interpolated scanning point Figure 2 3 R1-R6: Actual scanning line Sample points 11 to 13: Sample points of complementary scanning gland (a) Scanning line of image (b) Amplitude level time procedure correction form of above ■O■ (voluntary)

Claims (1)

【特許請求の範囲】 飛び越し走査されたテレビジョン信号を順次走査に変換
するための走査線の補間をフィールド内で行う走査線補
間回路において、 入力信号を遅延して、画面上垂直方向に2ライン並ぶ標
本点の標本値を同時に得るための遅延手段と、前記得ら
れた標本点を各々遅延して、画面上水平方向に3標本点
づつ並ぶ標本点の標本値を前記垂直方向に2ライン並ぶ
標本点の標本値と同時に得る手段と、上記6つの標本点
を画面上上のラインの左から3標本点を第1、第2、第
3の標本点とし、画面上下のラインの左から3標本点を
第4、第5、第6の標本点とし、第1と第6、第2と第
5、第3と第4の標本点の標本値の平均値および相関を
検出する手段と、前記3つの標本値の平均値を入力とし
、これらを切り換えて出力するスイッチ回路と、前記3
つの標本値の相関検出結果を入力とし、相関検出結果に
応じて前記スイッチ回路の切り替えを制御する信号を送
出する判定回路と、前記判定回路の判定結果が、補間す
る注目標本点の画面上1ライン上下、1画素左右の補間
標本点の判定結果から孤立点であると判断した場合に1
ライン上下あるいは1画素左右の補間標本点の判定結果
に置き換える孤立点除去回路とを備えたことを特徴とす
る走査線補間回路。
[Claims] In a scanning line interpolation circuit that performs interpolation of scanning lines within a field to convert an interlace-scanned television signal to a progressive scan, an input signal is delayed to generate two lines vertically on the screen. a delay means for simultaneously obtaining the sample values of the sample points arranged in a row, and delaying each of the obtained sample points so that the sample values of the sample points arranged horizontally on the screen, 3 sample points each, are arranged in 2 lines in the vertical direction. Means for obtaining the sample value of the sample point at the same time, and the above six sample points, the three sample points from the left of the line at the top of the screen are the first, second, and third sample points, and the three sample points from the left of the line at the top and bottom of the screen. Means for detecting the average value and correlation of the sample values of the first and sixth, second and fifth, and third and fourth sample points, with the sample points being fourth, fifth, and sixth sample points; a switch circuit that receives the average value of the three sample values as input and switches and outputs the average value;
a determination circuit that receives correlation detection results of two sample values as input and sends out a signal to control switching of the switch circuit according to the correlation detection results; 1 if it is judged to be an isolated point from the judgment results of the interpolated sample points above and below the line, and one pixel left and right.
1. A scanning line interpolation circuit comprising: an isolated point removal circuit that replaces determination results of interpolation sample points above and below a line or on the left and right sides of a pixel.
JP2024613A 1990-02-02 1990-02-02 Scanning line interpolation circuit Pending JPH03229583A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2024613A JPH03229583A (en) 1990-02-02 1990-02-02 Scanning line interpolation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2024613A JPH03229583A (en) 1990-02-02 1990-02-02 Scanning line interpolation circuit

Publications (1)

Publication Number Publication Date
JPH03229583A true JPH03229583A (en) 1991-10-11

Family

ID=12143001

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2024613A Pending JPH03229583A (en) 1990-02-02 1990-02-02 Scanning line interpolation circuit

Country Status (1)

Country Link
JP (1) JPH03229583A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001017243A1 (en) * 1999-08-31 2001-03-08 Sharp Kabushiki Kaisha Image interpolation system and image interpoloation method
JP2004215266A (en) * 2002-12-26 2004-07-29 Samsung Electronics Co Ltd Device for improving reproduction quality of video and its method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001017243A1 (en) * 1999-08-31 2001-03-08 Sharp Kabushiki Kaisha Image interpolation system and image interpoloation method
AU762673B2 (en) * 1999-08-31 2003-07-03 Sharp Kabushiki Kaisha Image interpolation system and image interpoloation method
US6980254B1 (en) 1999-08-31 2005-12-27 Sharp Kabushiki Kaisha Image interpolation system and image interpolation method
JP2004215266A (en) * 2002-12-26 2004-07-29 Samsung Electronics Co Ltd Device for improving reproduction quality of video and its method
US7697790B2 (en) 2002-12-26 2010-04-13 Samsung Electronics Co., Ltd. Apparatus and method for enhancing quality of reproduced image
JP4524104B2 (en) * 2002-12-26 2010-08-11 三星電子株式会社 Apparatus and method for improving reproduction quality of video

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