JPH04137892A - Signal detection circuit - Google Patents
Signal detection circuitInfo
- Publication number
- JPH04137892A JPH04137892A JP2256906A JP25690690A JPH04137892A JP H04137892 A JPH04137892 A JP H04137892A JP 2256906 A JP2256906 A JP 2256906A JP 25690690 A JP25690690 A JP 25690690A JP H04137892 A JPH04137892 A JP H04137892A
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- picture
- circuit
- signal
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Links
- 238000001514 detection method Methods 0.000 title claims abstract description 47
- 230000006866 deterioration Effects 0.000 abstract description 11
- 230000001960 triggered effect Effects 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 21
- 230000003068 static effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 238000007790 scraping Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229940028444 muse Drugs 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- GMVPRGQOIOIIMI-DWKJAMRDSA-N prostaglandin E1 Chemical compound CCCCC[C@H](O)\C=C\[C@H]1[C@H](O)CC(=O)[C@@H]1CCCCCCC(O)=O GMVPRGQOIOIIMI-DWKJAMRDSA-N 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
- Television Systems (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野]
本発明は、信号検出回路に係り、特に映画フィルム等か
ら変換されたテレビジョン信号の検出を行う回路に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a signal detection circuit, and particularly to a circuit for detecting a television signal converted from a movie film or the like.
[従来の技術] 現行テレビジョン方式(NTSC方式)では。[Conventional technology] In the current television system (NTSC system).
飛越(インタレース)走査により1フレームを2フイー
ルドに分けて画像を伝送しており、毎秒30フレーム(
60フイールド)の体数である。Images are transmitted by dividing one frame into two fields using interlaced scanning, at a rate of 30 frames per second (
60 fields).
これに対し、16mmや35mmなどの標準フィルムは
毎秒24コマである。標準のスクリーン用映写機をその
ままテレビカメラと組み合わせてフィルム送像すると、
映写機のシャッタとテレビの走査の関係から、映像に上
下に動く明瞭な横縞が現れたり激しいちらつきが出て実
用にならないため、一般にテレシネと呼ばれる映写機に
よってフィルムの像をテレビジョン信号に変換する。In contrast, standard films such as 16 mm and 35 mm have a rate of 24 frames per second. If you combine a standard screen projector with a TV camera and send film,
Because of the relationship between the shutter of the projector and the scanning of the television, clear horizontal stripes moving up and down and severe flickering occur in the image, making it impractical, so a projector called a telecine is generally used to convert the film image into a television signal.
テレシネは、フィルムの毎秒24コマとテレビの毎秒6
0フイールドを対応させるため、1/12秒を1周期と
して、フィルム2コマを5フイールドに変換する。現在
よく用いられている2−3プルダウン方式のテレシネで
は、奇数番目のフィルムについては2フイールド(2/
60秒)ごとにかき落とし、偶数番目のフィルムについ
ては3フイールドごとにかき落とすことにより、フィル
ム2コマと5フイールドを対応させている。Telecine has 24 frames per second for film and 6 frames per second for television.
In order to correspond to the 0 field, 2 frames of film are converted into 5 fields, with 1/12 second being one cycle. In the 2-3 pulldown telecine system that is commonly used today, odd-numbered films are processed using 2 fields (2/3).
By scraping off every 60 seconds) and scraping off every 3 fields for even-numbered films, 2 frames of film correspond to 5 fields.
(参考文献:たとえば、
1)岩瀬雄−2′ビデオ用語事典、′写真工業出版社、
1989年8月。(References: For example, 1) Yu Iwase - 2'Video Terminology Dictionary,'Shashin Kogyo Publishing,
August 1989.
2)テレビジョン学会編、′テレビジョン工学ハンドブ
ック、″オーム社、 1969年12月、)上記のよう
な、フィルムからテレビジョン信号に変換した[テレシ
ネ画像信号]の検出方法として、例えば、特願平2−4
5408号記載の手法がある。2) Edited by the Television Society of Japan, ``Television Engineering Handbook,'' Ohmsha, December 1969) As a method for detecting [telecine image signals] converted from film to television signals as described above, for example, a patent application has been proposed. Hei 2-4
There is a method described in No. 5408.
上述したように、フィルム2コマはテレビジョン信号の
5フイールドに対応している。このとき例えば、第4図
に示すように第1のフィルムから第1および第2のフィ
ールド画像が作成され、第2のフィルムから第3、第4
.第5のフィールド画像が作成されるものとする。この
際、第3のフィールド画像と第5のフィールド画像の低
周波数成分(2M Hz以下)は全く同じ信号になるた
め、1フイ一ルド期間中フレーム差信号を生じない″静
止フィールド”になり、これが5フイ一ルド周期で繰り
返されることを検出して[テレシネ画像コと判定する。As mentioned above, two frames of film correspond to five fields of television signals. At this time, for example, as shown in FIG. 4, first and second field images are created from the first film, and third and fourth field images are created from the second film.
.. It is assumed that a fifth field image is created. At this time, since the low frequency components (2 MHz or less) of the third field image and the fifth field image become exactly the same signal, they become a "static field" in which no frame difference signal occurs during one field period. It is detected that this is repeated every 5 fields, and it is determined that this is a telecine image.
また、上記″静止フィールド″の位置から現在処理中の
フィールド位相を検出し、フィールドごとに異なった処
理を行う際の基準とする。Furthermore, the phase of the field currently being processed is detected from the position of the "still field" and used as a reference when performing different processing for each field.
上記従来手法をIDTVやEDTVなどのテレビジョン
受像機に用いれば、受像機側だけの信号処理で[テレシ
ネ画像]と[一般画像]とを判定でき、[テレシネ画像
]の場合にはその性質に適した輝度−色信号分離や順次
走査化を行うことができるため、著しい画質改善効果を
得ることができる。If the above-mentioned conventional method is applied to a television receiver such as IDTV or EDTV, it is possible to determine whether a ``telecine image'' or ``general image'' is determined by signal processing only on the receiver side, and in the case of a ``telecine image'', the characteristics Since suitable luminance-chrominance signal separation and sequential scanning can be performed, a significant image quality improvement effect can be obtained.
[発明が解決しようとする課題]
上記従来例では、フレーム差信号の低域周波数成分と、
ある設定値THと画素ごとに比較を行う。[Problems to be Solved by the Invention] In the above conventional example, the low frequency component of the frame difference signal,
A comparison is made for each pixel with a certain set value TH.
フレーム差の低域成分が1フイ一ルド期間中に1画素で
もTHよりも大きくなった場合に動きフィールドとし、
それ以外は静止フィールドとする。If the low frequency component of the frame difference becomes larger than TH for even one pixel during one field period, it is considered a motion field,
The rest is a static field.
[テレシネ画像コの場合にはこの静止フィールドが5フ
イールド中に必ず1回以上出現する性質を利用して、[
テレシネ画像]と[一般画像]との判定を行っている。[In the case of telecine images, taking advantage of the property that this static field always appears at least once in five fields, [
[Telecine image] and [General image] are determined.
しかし、画像自体が長時間静止しているときは、[一般
画像コも[テレシネ画像]と同様に静止フィールドが連
続することになり1本質的に両者を区別することができ
ない。例えば、特願平2−45408号記載の輝度−色
信号分離方式と順次走査化方式では、定常的な静止画に
ついては、[テレシネ画像]も[一般画像コも同一の信
号処理結果となるため、どちらのモードと判定しても問
題はない。しかし、動き始めなどの過渡状態では[−般
画像コをテレシネモードで順次走査化処理を行うと、再
生画像が2重像になるなど、著しい画質劣化が生じる。However, when the image itself remains stationary for a long time, the still field in the general image is continuous, just like in the telecine image, and it is essentially impossible to distinguish between the two. For example, in the luminance-color signal separation method and progressive scanning method described in Japanese Patent Application No. 2-45408, for regular still images, the same signal processing results are obtained for both telecine images and general images. , there is no problem in determining which mode it is. However, in a transient state such as the start of movement, if normal images are sequentially scanned in telecine mode, significant image quality deterioration occurs, such as double images in the reproduced image.
動きの過渡状態、すなわち、静止画をはさんだモードの
変化は、以下のような4通りがある。There are four types of transitional states of motion, ie, mode changes between still images, as follows.
(変化1)一般画像→静止画→一般画像(変化2)一般
画像→静止画→テレシネ画像(変化3)テレシネ画像→
静止画→一般画像(変化4)テレシネ画像→静止画→テ
レシネ画像上記従来例では、静止画の際に[テレシネ画
像]と判定してしまうため、(変化1)や(変化3)の
ように[一般画像コが動き始めても、テレシネ検出を行
うために必要な5フイールドの間は[テレシネ画像]と
誤検出され、著しい画質劣化が生じる。(Change 1) General image → Still image → General image (Change 2) General image → Still image → Telecine image (Change 3) Telecine image →
Still image → General image (Change 4) Telecine image → Still image → Telecine image In the above conventional example, since the still image is determined to be a [telecine image], it is changed as in (Change 1) and (Change 3). [Even if the general image starts to move, it will be erroneously detected as a [telecine image] during the five fields required for telecine detection, resulting in significant image quality deterioration.
また、(変化2)や(変化4)のように[テレシネ画像
コが動き始めた場合にも、静止フィールドが5フイール
ド中に1回よりも多いときにはフィールド位相の検出が
不可能(不定)であるため、動き始めの5フイールドは
[テレシネモートコによる処理ができない。In addition, as in (Change 2) and (Change 4), even when the telecine image starts moving, it is impossible to detect the field phase (undefined) if there are more than 1 stationary field in 5 fields. Therefore, the first 5 fields cannot be processed by Telecine Motoko.
従って、本発明の目的は、静止画が長時間連続する場合
など、原理的にテレシネ検出不能な画像信号が入力され
た場合にも再生画像の劣化が少なくなるような検圧結果
を出力する[テレシネ画像検出回路]を提供することに
ある。Therefore, an object of the present invention is to output pressure detection results that reduce deterioration of reproduced images even when image signals that cannot be detected by telecine in principle are input, such as when still images continue for a long time. The purpose of the present invention is to provide a telecine image detection circuit].
[課題を解決するための手段]
上記目的は、フレーム間の画像の動きを検出する手段と
、前記動き検出結果の5フイ一ルド周期を検出する手段
と、前記周期検出結果を保持する手段と、前記周期検出
結果に従って同一周期の信号を発生する手段を用いるこ
とにより達成される。[Means for Solving the Problems] The above object includes a means for detecting movement of an image between frames, a means for detecting a 5-field cycle of the motion detection result, and a means for holding the cycle detection result. This is achieved by using means for generating signals of the same period according to the period detection result.
[作用コ
まず、従来と同様に、フレーム間動き検出を行ったのち
に、動き検出結果の5フイ一ルド周期を検出し、[テレ
シネ画像コと[一般画像コの判定を行う。この際、フレ
ーム間の差が無い″静止フィールド″が5フイ一ルド周
期中にただ1つだけ存在する場合は[テレシネ画像コと
し、″静止フィールド″が1つも存在しない場合は[一
般画像]とし、保持回路にモードを記憶させる。また、
“静止フィールド”が複数存在する場合、すなわち静止
画が連続する場合は、静止画状態になる以前のモードを
保持回路から読みだして[テレシネ画像コか[一般画像
]かを出力する。さらに、5フイールド中に“静止フィ
ールド″がただ1つだけ存在し、〔テレシネ画像]が確
定しているときに、自走回路にトリガをかけて5フイ一
ルド周期の信号を発生させ、フィールド位相が不定とな
る静止画の際に自走回路の出力を基準位相として用いる
。[Operation] First, as in the conventional case, after performing inter-frame motion detection, the 5-field cycle of the motion detection results is detected, and a determination is made between a telecine image and a general image. At this time, if there is only one "still field" with no difference between frames in a 5-field period, it is considered a [telecine image], and if there is no "still field" at all, it is considered a [general image]. and stores the mode in the holding circuit. Also,
When a plurality of "still fields" exist, that is, when still images are continuous, the mode before the still image state is read from the holding circuit and outputs whether it is a telecine image or a general image. Furthermore, when there is only one "still field" among the 5 fields and the [telecine image] is determined, the free-running circuit is triggered to generate a signal with a period of 5 fields, and the field The output of the free-running circuit is used as a reference phase when a still image has an unstable phase.
上記の処理を行うことにより、静止画の前後でモード変
化のない(変化1)および(変化4)は完全に救済でき
る。また、(変化2)の静止画から[テレシネ画像]に
変化する過渡期には[一般画像]として処理を行うため
、画質は若干劣化するものの被害は少なくなる。従って
、従来のテレシネ検出方式と同様の結果となるのは(変
化3)の場合だけとなる。By performing the above processing, cases in which there is no mode change before and after the still image (change 1) and (change 4) can be completely repaired. Furthermore, during the transition period when the still image changes to the telecine image (change 2), the image is processed as a general image, so although the image quality may deteriorate slightly, the damage will be less. Therefore, it is only in the case of (change 3) that a result similar to that of the conventional telecine detection method is obtained.
従って、上記手段を用いることにより、静止画が長時間
連続した場合の再生画像を劣化を最小限に抑えることが
でき、上記目的を達成することができる。Therefore, by using the above means, it is possible to minimize the deterioration of reproduced images when still images continue for a long time, and the above object can be achieved.
[実施例] 以下、図面を用いて本発明の詳細な説明する。[Example] Hereinafter, the present invention will be explained in detail using the drawings.
また、以下の説明の中で用いる論理値の“0″および“
1″は、それぞれ信号の“Lレベル″および″′Hレベ
ル″を表すものとする。In addition, the logical values “0” and “
1'' represents the "L level" and "'H level" of the signal, respectively.
第1図に、本発明の一実施例の具体的な構成例を示す。FIG. 1 shows a specific configuration example of an embodiment of the present invention.
同図において、フレーム間動き検出回路100により、
入力されたNTSC信号の画素ごとのフレーム間の動き
の有無を検出する。ここで、フレーム間動き検出回路1
00は525H(IHは1水平走査期間:約63.5μ
S)遅延回路1、減算回路2、輝度信号の低域(2M
Hz以下)だけを通過させるフィルタ3、スレッショル
ド値を出力するTH設定回路4.およびフィルタ3の出
力と固定値とを比較する比較回路5から成っている。上
記フレーム間動き検出回路100の出力をホールド回路
6により1フィールド期間保持し、1フィールドの間に
1画素でも動いている場合には“動きフィールド′″、
全画素が静止している場合には″静止フィールド”とす
る。後述する5フイ一ルド周期検出回路7を用いて、ホ
ールド回路6の出力の周期性を検出する。さらに、この
周期検出結果を用いて、後述の保持回路8および自走回
路9により[テレシネモード]と[一般モードコの判定
、およびフィールド位相の検出を行う。、これらの回路
は、制御回路10により発生させたフィールド周期のパ
ルスによって制御を行う。In the figure, the interframe motion detection circuit 100 performs
The presence or absence of movement between frames for each pixel of the input NTSC signal is detected. Here, interframe motion detection circuit 1
00 is 525H (IH is 1 horizontal scanning period: approximately 63.5μ
S) Delay circuit 1, subtraction circuit 2, low frequency of luminance signal (2M
3. A filter 3 that passes only the frequency (below Hz), and a TH setting circuit 4 that outputs a threshold value. and a comparison circuit 5 that compares the output of the filter 3 with a fixed value. The output of the interframe motion detection circuit 100 is held for one field period by the hold circuit 6, and if even one pixel moves during one field, a "motion field" is generated.
If all pixels are stationary, it is called a "static field." The periodicity of the output of the hold circuit 6 is detected using a 5-field period detection circuit 7, which will be described later. Furthermore, using this period detection result, a holding circuit 8 and a free-running circuit 9, which will be described later, determine whether the telecine mode or the general mode is selected, and detect the field phase. , these circuits are controlled by field cycle pulses generated by the control circuit 10.
また、このホールド回路6の替わりに積分回路を用い、
画素ごとの動き量を1フイ一ルド期間積分したものを出
力としてもよい。Also, an integrating circuit is used instead of this hold circuit 6,
The amount of motion for each pixel may be integrated over one field period and output.
第2図を用いて、上述した5フイ一ルド周期検出回路7
、保持回路8.および自走回路9のさらに詳しい構成に
ついて説明する。まず、同図中の5フイ一ルド周期検出
回路7において、ホールド回路6の出力信号を、直列に
接続しフィールドパルスで作動する遅延回路11〜20
によって遅延させる。この際、NOR回路21を用いて
5クロツク(5フイールド)遅延ごとの信号の反転論理
積をとる。ここでは、5フイールドごとにit O”(
静止フィールド)となる周期性が2周期連続することを
検出している。ここで、遅延回路11〜20の個数を増
やして2周期以上の検出を行い、検出精度をあげてもよ
い。さらに遅延回路22〜26を用いてNOR回路21
の出力を遅延させ、ROM27に入力する。ここでは、
後述するテーブルに従って″テレシネ/一般モード信号
″“クロックゲート信号” 1′力ウンタクリア信号
″′を発生する。Using FIG. 2, the above-mentioned 5-field period detection circuit 7
, holding circuit 8. A more detailed configuration of the free-running circuit 9 will now be described. First, in the 5-field period detection circuit 7 shown in the figure, the output signal of the hold circuit 6 is connected in series to delay circuits 11 to 20 operated by field pulses.
Delayed by At this time, the NOR circuit 21 is used to calculate the inverted AND of the signals every 5 clocks (5 fields) delayed. Here, every 5 fields it O”(
Two consecutive periods of periodicity resulting in a stationary field are detected. Here, the number of delay circuits 11 to 20 may be increased to perform detection for two or more cycles to improve detection accuracy. Further, using the delay circuits 22 to 26, the NOR circuit 21
The output of the signal is delayed and inputted to the ROM 27. here,
``Telecine/general mode signal'', ``clock gate signal'', 1' power counter clear signal'' are generated according to the table described later.
同図中の保持回路8において、クロックとなるフィール
ドパルス信号を、AND回路28を用いて、5フイ一ル
ド周期検出回路7で発生させたクロックゲート信号でゲ
ートする。すなわち、″クロックゲート信号″がパ1′
″のときだけ、クロックをDフリップフロップ29に入
力し、5フイ一ルド周期検出回路7で発生させた″テレ
シネ/−般モード信号″を保持する。In the holding circuit 8 shown in the figure, a field pulse signal serving as a clock is gated with a clock gate signal generated by the 5-field period detection circuit 7 using an AND circuit 28. In other words, the "clock gate signal" is
'', the clock is input to the D flip-flop 29, and the ``telecine/-general mode signal'' generated by the 5-field period detection circuit 7 is held.
同図中の自走回路9において、カウンタ30によりtL
OPI〜i+ 4 ++で表される5フイ一ルド周期
の″フィールド位相信号”を発生させる。この際、位相
基準として5フイ一ルド周期検出回路7で発生させた“
カウンタクリア信号”を用い、この信号でカウンタにリ
セットをかける。In the free-running circuit 9 in the figure, the counter 30 calculates tL.
A "field phase signal" with a period of 5 fields expressed as OPI~i+4++ is generated. At this time, the "
Use the "counter clear signal" to reset the counter.
上記の“テレシネ/一般モード信号″および“フィール
ド位相信号″を用いて、[テレシネ画像]に適した輝度
−色信号分離処理や順次走査化処理等を行う。Using the above-mentioned "telecine/general mode signal" and "field phase signal", luminance-chrominance signal separation processing, sequential scanning processing, etc. suitable for [telecine image] are performed.
第3図に、5フイ一ルド周期検呂回路7で用いるROM
27のテーブルの一例を示す。入力信号■0〜工4がす
べて110 P+の場合、すなわち″静止フィールド”
が5フイールド中に1つも検出できない場合には、[一
般画像]であるとし、″クロックゲート信号″として′
1″を出力して保持回路8にクロックをかけ、また、自
走カウンタ30のクリアは行わない。入力信号■0〜工
4の中でただ1つだけ′1′″の場合、すなわち″静止
フィールド″が5フイールド中にただ1つだけ検出され
た場合には、[テレシネ画像]であるとし、′クロック
ゲート信号”として“1″を出力して保持回路8にクロ
ックをかけ、また、入力信号■0が“1″の場合だけ自
走カウンタ30のクリアを行う。入力信号工0〜工4の
中に“1”が複数存在する場合、すなわち、′静止フィ
ールド″が複数存在してフィールド位相が不定となる場
合には、“クロックゲート信号″を“0”にし、カウン
タのクリアもかけない。このようなテーブルを用いるこ
とにより、静止画が連続した場合にも、それ以前のモー
ドとフィールド位相の連続性が保持される。FIG. 3 shows the ROM used in the 5-field cycle check circuit 7.
An example of 27 tables is shown. If input signals ■0 to 4 are all 110 P+, that is, "static field"
If no one is detected in the 5 fields, it is assumed that it is a [general image] and it is used as a "clock gate signal".
1'' is output to apply a clock to the holding circuit 8, and the free-running counter 30 is not cleared.If only one of the input signals 0 to 4 is ``1'', that is, ``stand still''. If only one "field" is detected among the five fields, it is determined that it is a telecine image, and "1" is output as the "clock gate signal" to clock the holding circuit 8, and the input The self-running counter 30 is cleared only when the signal 0 is "1".If there are multiple "1"s in the input signals 0 to 4, that is, there are multiple 'stationary fields' and the field When the phase becomes unstable, the "clock gate signal" is set to "0" and the counter is not cleared. By using such a table, the continuity of the previous mode and field phase is maintained even when still images are consecutive.
第5図に、本発明の他の実施例の具体的な構成例を示す
。ここでは、[一般画像]を[テレシネ画像コと誤検出
した場合には画質劣化は重大であり、[テレシネ画像]
を[一般画像]と誤検出した場合の画質劣化は軽微であ
ることに着目し、静止画が連続した場合には[一般画像
]として処理することにする。従って、上述したモード
変化、すなわち、
(変化1)一般画像→静止画→一般画像(変化2)一般
画像→静止画→テレシネ画像(変化3)テレシネ画像→
静止画→一般画像(変化4)テレシネ画像→静止画→テ
レシネ画像の中で、(変化1)と(変化3)については
劣化がなく、(変化2)および(変化4)については動
き始めの5フイールドだけ[一般画像コとして処理する
。同図は第2図に示した回路構成の変形であり、保持回
路8および自走口u9を用いない。FIG. 5 shows a specific configuration example of another embodiment of the present invention. Here, if [General image] is mistakenly detected as [Telecine image], image quality deterioration will be serious, and [Telecine image]
Focusing on the fact that the deterioration in image quality is slight when erroneously detecting a [general image], we decided to process a series of still images as a [general image]. Therefore, the above-mentioned mode changes, namely: (Change 1) General image → Still image → General image (Change 2) General image → Still image → Telecine image (Change 3) Telecine image →
Still image → General image (Change 4) Telecine image → Still image → Telecine image, there is no deterioration for (Change 1) and (Change 3), and for (Change 2) and (Change 4) there is no deterioration at the beginning of movement. Only 5 fields [processed as a general image]. This figure shows a modification of the circuit configuration shown in FIG. 2, and does not use the holding circuit 8 and the self-propelled port u9.
同図において、5フイ一ルド周期検出回N7の基本構成
は第2図と同一であり、ROM31のテーブルが異なる
。また、″テレシネ/一般モード信号″とともに″フィ
ールド位相信号”もROM31から出力する。In the figure, the basic configuration of the 5-field period detection circuit N7 is the same as that in FIG. 2, but the table in the ROM 31 is different. Further, a "field phase signal" is also output from the ROM 31 along with a "telecine/general mode signal".
第6図に、上述したROM31のテーブルの一例を示す
。入力信号工0〜I4がすべて110 P+の場合、す
なわち″静止フィールド″が5フイールド中に1つも検
出できない場合には、[一般画像コとする。入力信号工
0〜■4の中でただ1つだけ“1”の場合、すなわちパ
静止フィールド″が5フイールド中にただ1つだけ検出
された場合には、[テレシネ画像コであるとし、入力信
号IO〜■4に応じて“フィールド位相信号”を出力す
る。入力信号■0〜■4の中に“1″が複数存在する場
合、すなわち、″静止フィールド”が複数存在してモー
ドが不定となる場合には、[一般画像]とする。FIG. 6 shows an example of the table of the ROM 31 mentioned above. If all of the input signal signals 0 to I4 are 110 P+, that is, if no "still field" can be detected among the five fields, the image is set to [General image]. If only one of the input signal fields 0 to ■4 is "1", that is, only one static field is detected among the five fields, it is assumed that this is a telecine image, and the input Outputs a "field phase signal" in response to signals IO to ■4. If there are multiple "1"s among the input signals ■0 to ■4, that is, there are multiple "stationary fields" and the mode is undefined. In this case, select [General image].
このようなテーブルを用いることにより、静止画が連続
した場合には、動き始め等の過渡状態で[一般画像コの
信号処理が行われ、誤検出による画質劣化を少なくでき
る。By using such a table, when still images are consecutive, the signal processing of the general image is performed in a transient state such as the start of movement, and image quality deterioration due to false detection can be reduced.
また、[テレシネ検出コをより精度よく行うためには、
動きが過渡状態の時はモード判定を待ち、定常的な動き
となったときに判定を行うことが考えられる。すなわち
、画像信号をフィールドメモリ等により数フイールド遅
延させ、その間にモードの先行判定(未来のフィールド
のモード判定)を行うこともできる。In addition, [To perform telecine detection more accurately,
It is conceivable to wait for mode determination when the motion is in a transient state, and perform the determination when the motion becomes steady. That is, it is also possible to delay the image signal by several fields using a field memory or the like, and to perform a preliminary determination of the mode (mode determination of a future field) during that time.
以上の説明は、現行のNTSC信号を前提に説明を行っ
たが、これに限定されるものではなく、例えばMUSE
などのハイビジョン信号やEDTV信号などのテレビジ
ョン信号の場合には同様に本発明を適用できる。また、
映画フィルムに限定されず、伝送コマ数が信号源のコマ
数よりも多い場合(意図的に信号源のコマ落としをした
信号も含む)には、本発明を同様に適用することができ
る。The above explanation was based on the current NTSC signal, but it is not limited to this, and for example, MUSE
The present invention can be similarly applied to television signals such as high-definition signals and EDTV signals. Also,
The present invention is not limited to movie films, and can be similarly applied to cases where the number of transmitted frames is greater than the number of frames of the signal source (including signals in which frames of the signal source are intentionally dropped).
さらに、本発明は、伝送されたテレビジョン信号だけで
なく、VTRやビデオディスク等に記録された信号に対
しても同様に用いることができる。Furthermore, the present invention can be used not only for transmitted television signals but also for signals recorded on VTRs, video discs, and the like.
[発明の効果]
本発明を適用することにより、テレビジョン受像機側だ
けの信号処理で[テレシネ画像]と[−般画像]との判
定を精度よく行うことができ、[テレシネ画像]の際に
はそれに適した信号処理ができるようになるため、実施
して効果は極めて大きい。[Effects of the Invention] By applying the present invention, it is possible to accurately determine between a [telecine image] and a [-general image] by signal processing only on the television receiver side, and it is possible to accurately determine a [telecine image] and a [-general image]. Since it becomes possible to perform signal processing suitable for this purpose, the effects of implementation are extremely large.
第1図は本発明の一実施例の構成図、第2図および第3
図は本発明の一実施例をさらに詳しく説明する図、第4
図は従来のテレシネ検出の原理を説明する図、第5図お
よび第6図は本発明の他の実施例を説明する図である。
符号の説明
1.11,12,13,14,15,16,17,18
,19,20,22,23,24゜25.26・・・遅
延回路;2・・・減算回路;3・・・フィルタ;4・・
・TH設定回路;5・・・比較回路;6・・ホールド回
路;7・・5フイ一ルド周期検出回路;8・・・保持回
路;9・・・自走回路;10・・・制御回路;21・・
・NOR回路;27,31・・・ROM;28・・・A
ND回路;29・・・フリップフロップ;3o・・・カ
ウンタ。
〆FIG. 1 is a block diagram of one embodiment of the present invention, FIG. 2 and FIG.
Figure 4 is a diagram explaining one embodiment of the present invention in more detail.
This figure is a diagram for explaining the principle of conventional telecine detection, and FIGS. 5 and 6 are diagrams for explaining other embodiments of the present invention. Explanation of symbols 1.11, 12, 13, 14, 15, 16, 17, 18
, 19, 20, 22, 23, 24゜25.26... Delay circuit; 2... Subtraction circuit; 3... Filter; 4...
・TH setting circuit; 5... Comparison circuit; 6... Hold circuit; 7... 5-field period detection circuit; 8... Holding circuit; 9... Free-running circuit; 10... Control circuit ;21...
・NOR circuit; 27, 31...ROM; 28...A
ND circuit; 29...Flip-flop; 3o...Counter. 〆
Claims (1)
伝送コマ数よりも少ないことを検出する信号検出回路に
おいて、 動き検出回路と、前記動き検出結果の周期性の有無およ
び周期性がある場合には該周期中の位相を検出する周期
検出回路と、前記周期検出結果を保持する保持回路と、
前記周期検出結果に従って同一周期かつ同一位相の信号
を発生する自走回路を備えたことを特徴とする、信号検
出回路。 2、信号源の毎秒コマ数が、テレビジョン信号の毎秒の
伝送コマ数よりも少ないことを検出する信号検出回路に
おいて、 動き検出回路と、前記動き検出結果の周期性の有無およ
び周期性がある場合には該周期中の位相を検出する周期
検出回路とを備え、該周期性があると検出された場合で
も該位相検出結果が不定となる場合には該周期性がない
場合と同一の検出結果を出力することを特徴とする、信
号検出回路。[Claims] 1. A signal detection circuit that detects that the number of frames per second of a signal source is smaller than the number of frames per second transmitted of a television signal, comprising a motion detection circuit and a periodicity of the motion detection result. a period detection circuit that detects the presence or absence of periodicity and detects the phase during the period; a holding circuit that holds the period detection result;
A signal detection circuit comprising a free-running circuit that generates signals having the same period and the same phase according to the period detection result. 2. In a signal detection circuit that detects that the number of frames per second of a signal source is smaller than the number of transmitted frames per second of a television signal, there is a motion detection circuit, and the presence or absence of periodicity of the motion detection result and periodicity. If the periodicity is detected, even if the periodicity is detected, and the phase detection result is indefinite, the detection is the same as when there is no periodicity. A signal detection circuit characterized by outputting a result.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP02256906A JP3102494B2 (en) | 1990-09-28 | 1990-09-28 | Signal detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP02256906A JP3102494B2 (en) | 1990-09-28 | 1990-09-28 | Signal detection circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04137892A true JPH04137892A (en) | 1992-05-12 |
JP3102494B2 JP3102494B2 (en) | 2000-10-23 |
Family
ID=17299032
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JP02256906A Expired - Lifetime JP3102494B2 (en) | 1990-09-28 | 1990-09-28 | Signal detection circuit |
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JP (1) | JP3102494B2 (en) |
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EP1246476A3 (en) * | 2001-02-06 | 2004-03-17 | Tektronix, Inc. | Frozen field detection of formerly encoded video signal |
EP1246476A2 (en) * | 2001-02-06 | 2002-10-02 | Tektronix, Inc. | Frozen field detection of formerly encoded video signal |
CN100409696C (en) * | 2001-02-06 | 2008-08-06 | 特克特朗尼克公司 | Detection of freeze field of coded video signal |
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US7233361B2 (en) | 2002-07-13 | 2007-06-19 | Samsung Electronics Co., Ltd. | Apparatus for and method of detecting whether incoming image signal is in film mode |
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JP2011045148A (en) * | 2010-11-29 | 2011-03-03 | Nec Personal Products Co Ltd | Method and device for displaying image |
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