JPS63169192A - Picture signal processing system - Google Patents

Picture signal processing system

Info

Publication number
JPS63169192A
JPS63169192A JP62000170A JP17087A JPS63169192A JP S63169192 A JPS63169192 A JP S63169192A JP 62000170 A JP62000170 A JP 62000170A JP 17087 A JP17087 A JP 17087A JP S63169192 A JPS63169192 A JP S63169192A
Authority
JP
Japan
Prior art keywords
signal
component
picture
high frequency
signals
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.)
Granted
Application number
JP62000170A
Other languages
Japanese (ja)
Other versions
JPH0478234B2 (en
Inventor
Yuichi Ninomiya
佑一 二宮
Yoshimichi Otsuka
吉道 大塚
Yoshinori Izumi
吉則 和泉
Seiichi Goshi
清一 合志
Yuichi Iwadate
祐一 岩舘
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.)
Japan Broadcasting Corp
Original Assignee
Nippon Hoso Kyokai NHK
Japan Broadcasting 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 Nippon Hoso Kyokai NHK, Japan Broadcasting Corp filed Critical Nippon Hoso Kyokai NHK
Priority to JP62000170A priority Critical patent/JPS63169192A/en
Publication of JPS63169192A publication Critical patent/JPS63169192A/en
Publication of JPH0478234B2 publication Critical patent/JPH0478234B2/ja
Granted legal-status Critical Current

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  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

PURPOSE:To performing the processing of a moving picture without the occurrence of a multi-line blur by suppressing a high frequency band component in the memory area of a picture signal by using a method to substitute a signal, obtained by selecting the signal component of the minimum absolute value in every picture element among the specific component signals of three kinds, for a high frequency band component signal. CONSTITUTION:When the picture signal is given the moving picture processing by using a temporal filter 2, the high frequency band component signal (b), the component signal (a), obtained by letting this high frequency band component signal pass through the temporal filter, and the component signal (a+b)/2, which is the mean value of these two component signals (a) and (b), are prepared. Then, by the method to substitute the signal, obtained by selecting the component signal of the minimum absolute value among these three kinds of the components in every picture element by a minimum absolute value selection circuit 3, for the high frequency band signal of the picture signal, the high frequency component of the moving area of the picture signal is suppressed. Thus, the multi-line blur does not occur, and the picture can be obscured properly, and the moving picture can be processed without injuring the picture quality.

Description

【発明の詳細な説明】 (産業上の利用分野) この発明は動画像信号の処理方式に係り、特に高品位テ
レビジョン信号送受信のエンコーダ、デコーダに適用し
て好適な動画像信号処理方式に関するものである。
[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a moving image signal processing method, and particularly to a moving image signal processing method suitable for application to encoders and decoders for transmitting and receiving high-definition television signals. It is.

(従来の技術) 第3図(a)は従来の画像信号動画像処理回路を示す0
画像信号の動画像処理の方式として、画像信号のフレー
ム方向のトランスバーサルまたはリカーシブフィルタか
らなるテンポラルフィルタがよく使用される。これは1
つにはフレーム相関のない信号例えばノイズを落すテン
ポラルローパスフィルタとして使用されたり、もう1つ
には動画像部分に対して2次元的(−次元の場合も有る
)高域成分信号を落したり、3次元的に折り返えし歪の
生じないアンティアライジングフィルタとして使用され
たりしてそれぞれ効果を上げている。
(Prior Art) FIG. 3(a) shows a conventional image signal moving image processing circuit.
As a method of video processing of image signals, a temporal filter consisting of a transversal or recursive filter in the frame direction of the image signal is often used. This is 1
One is that it is used as a temporal low-pass filter to remove signals without frame correlation, such as noise, and the other is that it is used to drop two-dimensional (sometimes -dimensional) high-frequency component signals to moving image parts. They have been used as anti-aliasing filters that do not produce three-dimensional aliasing distortion, and are highly effective.

(発明が解決しようとする問題点) 所が画像信号を代表する例えばテレビジョン信号などは
、フレーム単位で画像を伝送しているため、画像信号を
フレーム時間でサンプリングして伝送していることにな
り、これに基づく折り返し成分が当然存在し、通常のテ
ンポラルフィルタ、例えばフレーム単位の遅延線を備え
たトランスバーサルフィルタを介すると、特に動画像の
場合などフレーム単位の画像の移動が大きい場合、第3
図(blの各部波形図の画像信号出力Sou tに示す
よういわゆる多線ぼけとなってしまう欠点があった。
(Problems to be Solved by the Invention) For example, television signals, which represent image signals, transmit images in frame units, so the image signals are sampled and transmitted in frame time. Therefore, there is naturally an aliasing component based on this, and when passing through a normal temporal filter, for example a transversal filter with a frame-by-frame delay line, the 3
As shown in the image signal output Sout in the waveform diagram of each part in Figure (bl), there was a drawback that so-called multi-line blurring occurred.

なお、静止画像の場合は第3図(C)に示すようにとく
に問題はない。
Note that in the case of a still image, there is no particular problem as shown in FIG. 3(C).

これに対する対策としては、使用するフィルタの次数す
なわちタップ数を増加することにより成程度の効果は得
られるとされているが、実際は決定的なものではなく、
事実タップ数を増加することは特にトランスバーサルフ
ィルタ方式では必要なフレームメモリの数を増加させる
ことになり、いたずらに回路規模を増大させる結果にな
り、単なる信号の線形処理ではその問題は解決できない
欠点があった。
As a countermeasure against this, it is said that increasing the order of the filter used, that is, the number of taps, can achieve some effect, but in reality it is not decisive.
In fact, increasing the number of taps, especially in the transversal filter method, increases the number of frame memories required, unnecessarily increasing the circuit scale, and this problem cannot be solved by simple linear signal processing. was there.

そこで本発明の目的は上記欠点を排除し、比較的簡単な
非線形処理を入力画像信号にほどこすことにより、多線
ぼけの発生のない動画像に対しても良好な画像信号処理
方式を提供せんとするものである。
SUMMARY OF THE INVENTION Therefore, an object of the present invention is to eliminate the above-mentioned drawbacks and provide an image signal processing method that is good even for moving images without multi-line blurring by applying relatively simple nonlinear processing to input image signals. That is.

(問題点を解決するための手段) この目的を達成するため本発明画像信号処理方式は、画
像信号をテンポラルフィルタを用いて動画像処理するに
あたり、前記画像信号の高域成分信号、該高域成分信号
をテンポラルフィルタに通して得た成分信号および2つ
の前記成分信号の平均値となる成分信号を用意し、3種
の前記成分信号のうち絶対値の最小な成分信号を画素毎
に選択して得られた信号で、前記画像信号の高域成分信
号を置換する方法により、前記画像信号の動き領域の高
域成分を抑圧するようにしたことを特徴とするものであ
る。
(Means for solving the problem) In order to achieve this object, the image signal processing method of the present invention performs moving image processing on an image signal using a temporal filter. A component signal obtained by passing the component signal through a temporal filter and a component signal that is the average value of the two component signals are prepared, and the component signal with the smallest absolute value among the three component signals is selected for each pixel. The present invention is characterized in that the high-frequency component of the motion area of the image signal is suppressed by a method of replacing the high-frequency component signal of the image signal with a signal obtained by the above-described method.

(実施例) 以下添付図面を参照し、これに限定されない例をあげて
本発明を実施例により詳細に説明する。
(Example) The present invention will now be described in detail by way of example, with reference to the accompanying drawings and by way of non-limiting examples.

第1図に本発明処理方式に関わる実施例の構成ブロック
線図を示す、入力画像信号Sinはテンポラルフィルタ
2で処理される前に相補性のバイパス/ローパス(HP
/L P)フィルタ処理をする。
FIG. 1 shows a configuration block diagram of an embodiment related to the processing method of the present invention. The input image signal Sin is processed by a complementary bypass/low pass (HP) signal before being processed by a temporal filter 2.
/LP) Perform filter processing.

この処理は2次元のフィルタでも1次元のフィルタでも
同様である。
This process is the same for both two-dimensional filters and one-dimensional filters.

次にバイパス成分信号S。はテンポラルフィルタ処理さ
れて絶対値最小選択回路3への入力信号aが得られる。
Next is the bypass component signal S. is subjected to temporal filter processing to obtain an input signal a to the absolute value minimum selection circuit 3.

さらに絶対値最小選択回路3でこの入力信号aと、テン
ポラルフィルタ2で処理されない前記バイパス成分信号
S工、そのま\の選択回路3への入力信号すと、加算器
4とA係数器5により生成され入力信号aとbの平均値
である選択回路3への入力信号(a+b)/2  (以
下Cと記す)とのいずれが最小の絶対値を有するかり画
素毎に判断され、スイッチ6にてそれに相当する入力信
号が画素毎に選択されて、LP/HPフィルタ1による
ローパス成分信号SLpと加算器7で加算されて画像信
号出力5outとなる。
Further, in the absolute value minimum selection circuit 3, this input signal a, the bypass component signal S which is not processed by the temporal filter 2, and the input signal to the selection circuit 3 are input to the adder 4 and the A coefficient unit 5. The input signal (a+b)/2 (hereinafter referred to as C) to the selection circuit 3, which is the average value of the generated input signals a and b, is determined for each pixel as to which one has the smallest absolute value, and the switch 6 The corresponding input signal is selected for each pixel, and added to the low-pass component signal SLp from the LP/HP filter 1 by the adder 7, resulting in an image signal output 5out.

第1図示構成の回路の動作はテンポラルフィルタが1フ
レ一ム遅延単位の複数タップを有するトランスバーサル
フィルタ型である場合(通常の構成)には以下のように
なる。すなわち画像信号入力が静止画の場合には、第1
図(C)に示すように出力信号a、b、cはいずれも同
一の信号であるので画像信号人力Sinと画像信号出力
5outとは全(等しくなる。また画像信号入力が動画
の場合には、第1図(b)に示すように出力信号a、b
、cのうち絶対値最小の信号を用いる。すなわち最も高
域成分の少ない出力信号を用いるわけで、アンティアラ
イジングフィルタとして動作する。
The operation of the circuit having the configuration shown in the first diagram is as follows when the temporal filter is a transversal filter type having a plurality of taps in one frame delay unit (normal configuration). In other words, when the image signal input is a still image, the first
As shown in Figure (C), the output signals a, b, and c are all the same signal, so the image signal human input Sin and the image signal output 5out are all (equal).Also, when the image signal input is a moving image, , as shown in FIG. 1(b), the output signals a, b
, c, the signal with the minimum absolute value is used. That is, the output signal with the least high-frequency components is used, and it operates as an anti-arizing filter.

またテンポラルフィルタ2がローパス型フィルタ時にも
静止画と動画について同様に動作する。
Furthermore, even when the temporal filter 2 is a low-pass type filter, it operates in the same way for still images and moving images.

なお単に前述の多線ぼけのみを除去する目的であれば入
力信号Cは不要に思えるが、これは以下の理由により必
要となる。すなわち画像信号人力Sinの動画像の種類
によっては信号a、bの極性が全く異なっているのに、
その絶対値が非常に近い信号である場合が有り得る。こ
の時は1a1〉lblとなったりIal<lblとなっ
たりするが、これに応じて信号を選択切替えすると、信
号そのものは大幅に互いに異なって居るので、大きな不
連続が画像に発生して大きな妨害となり画質の劣化が著
しい、これを防止するため信号Cを選択枝に入れておけ
ば、この様は場合信号Cは極めて零に近い信号となり必
らず信号Cが選択されることになりこの問題は発生しな
い。
Note that the input signal C may seem unnecessary if the purpose is simply to remove the aforementioned multi-line blur, but it is necessary for the following reason. In other words, even though the polarities of the signals a and b are completely different depending on the type of moving image of the image signal human input Sin,
There may be cases where the signals have very close absolute values. In this case, 1a1>lbl or Ial<lbl, but if the signals are selected and switched accordingly, the signals themselves are significantly different from each other, so a large discontinuity occurs in the image and a large disturbance occurs. Therefore, the image quality deteriorates significantly.In order to prevent this, if signal C is included in the selection option, in this case, signal C will be extremely close to zero, and signal C will always be selected, which will solve this problem. does not occur.

第2図は第1図示絶対値最小選択回路3の1例の詳細ブ
ロック線図を示す。入力信号a、b、cは次の絶対値器
11.12.13でそれぞれ信号の絶対値1a1.lb
l、lclがとられる。比較器14゜15ではそれぞれ
IalとIc1.letとlblの大小関係が比較され
、それぞれjal≧ICI。
FIG. 2 shows a detailed block diagram of an example of the absolute value minimum selection circuit 3 shown in the first diagram. The input signals a, b, c are converted into absolute values 1a1 . lb
l, lcl are taken. Comparators 14 and 15 output Ial and Ic1. The magnitude relationship between let and lbl is compared, and jal≧ICI, respectively.

lcl〉lblの時比較器14と15の各出力B、  
Cは論理値1 (H)が出力され、この論理値1ではそ
れぞれスイッチ18.19でスイッチを下側に接続し、
lal<IcI、IcI<lblの時は出力論理値は零
(L)でスイッチ18.19は上側に接続する。かくて
比較器16の2つの入力には比較器14と15、スイッ
チ18と19により処理されて、それぞれIalとIc
1.IcIとlblのうち小さい方の値が入力されて再
び比較され、比較器16の出力には前と同じ関係の論理
値Aが出力される。
Each output B of the comparators 14 and 15 when lcl>lbl,
C outputs a logic value of 1 (H), and with this logic value of 1, the switches 18 and 19 are connected to the lower side, respectively.
When lal<IcI and IcI<lbl, the output logic value is zero (L) and the switches 18 and 19 are connected to the upper side. The two inputs of comparator 16 are thus processed by comparators 14 and 15 and switches 18 and 19 to provide Ial and Ic, respectively.
1. The smaller value of IcI and lbl is input and compared again, and the comparator 16 outputs a logic value A having the same relationship as before.

かくて論理回路17に入力される論理値A、B。The logic values A and B are thus input to the logic circuit 17.

Cが用意され、第1表の論理回路の真理表により回路1
7の出力(2ビットデジタル信号)により、すなわち0
0,01,10に応じてそれぞれ信号a、c、bが選択
される。
C is prepared, and according to the logic circuit truth table in Table 1, circuit 1
7 (2-bit digital signal), i.e. 0
Signals a, c, and b are selected according to 0, 01, and 10, respectively.

第1表 00:a 01:c 10:b 第2図示の例では信号a、c、bのうちどれが最小かを
判断し、最後にもとの信号のうちからそれに相当する信
号を取出して居るが、直接各段で信号a、c、bそのも
のを選択する方式を採用することもできる。
Table 1 00:a 01:c 10:b In the example shown in the second figure, it is determined which of the signals a, c, and b is the smallest, and finally the corresponding signal is extracted from the original signals. However, it is also possible to adopt a method in which the signals a, c, and b themselves are directly selected at each stage.

(発明の効果) 以上詳述してきたように本発明画像信号処理方式に関る
信号処理を実施することにより、多線ぼけの発生なく画
像の動きに応じて適当に画像をぼかすことができ、画質
を損なうことなく動画像の処理ができる。この方式は特
に高品位テレビジラン信号の帯域圧縮伝送におけるエン
コーダ、デコーダに適用して好適な動画像信号処理とな
る。
(Effects of the Invention) As detailed above, by carrying out the signal processing related to the image signal processing method of the present invention, it is possible to appropriately blur an image according to the movement of the image without causing multi-line blurring. It is possible to process video images without compromising image quality. This method is suitable for video signal processing particularly when applied to encoders and decoders in band compression transmission of high-definition television signals.

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

第1図(a)は本発明処理方式に関わる実施例の構成ブ
ロック線図を、また同図山)および(e)はそれぞれ動
画像および静止画像の場合の各部波形図を示し、 第2図は第1図示絶対値最小選択回路の詳細ブロック線
図を示し、 第3図(alは従来の処理方式に関わる構成ブロック線
図を、また同図(b)、 (C)はそれぞれ動画像およ
び静止画像の場合の各部波形図を示す。 1・・・ローパス/バイパス相補性フィルタ2・・・テ
ンポラルフィルタ 3・・・絶対値最小選択回路
FIG. 1(a) is a block diagram of the configuration of an embodiment related to the processing method of the present invention, and FIG. 1 shows a detailed block diagram of the minimum absolute value selection circuit shown in FIG. The waveform diagram of each part in the case of a still image is shown. 1...Low pass/bypass complementary filter 2...Temporal filter 3...Absolute value minimum selection circuit

Claims (1)

【特許請求の範囲】[Claims] 1、画像信号をテンポラルフィルタを用いて動画像処理
するにあたり、前記画像信号の高域成分信号、該高域成
分信号をテンポラルフィルタに通して得た成分信号およ
び2つの前記成分信号の平均値となる成分信号を用意し
、3種の前記成分信号のうち絶対値の最小な成分信号を
画素毎に選択して得られた信号で、前記画像信号の高域
成分信号を置換する方法により、前記画像信号の動き領
域の高域成分を抑圧するようにしたことを特徴とする画
像信号処理方式。
1. When performing moving image processing on an image signal using a temporal filter, a high-frequency component signal of the image signal, a component signal obtained by passing the high-frequency component signal through a temporal filter, and an average value of the two component signals. By a method of preparing component signals such as An image signal processing method characterized by suppressing high-frequency components in a moving region of an image signal.
JP62000170A 1987-01-06 1987-01-06 Picture signal processing system Granted JPS63169192A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62000170A JPS63169192A (en) 1987-01-06 1987-01-06 Picture signal processing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62000170A JPS63169192A (en) 1987-01-06 1987-01-06 Picture signal processing system

Publications (2)

Publication Number Publication Date
JPS63169192A true JPS63169192A (en) 1988-07-13
JPH0478234B2 JPH0478234B2 (en) 1992-12-10

Family

ID=11466545

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62000170A Granted JPS63169192A (en) 1987-01-06 1987-01-06 Picture signal processing system

Country Status (1)

Country Link
JP (1) JPS63169192A (en)

Also Published As

Publication number Publication date
JPH0478234B2 (en) 1992-12-10

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