JPS63246092A - Shadow chromakey device - Google Patents

Shadow chromakey device

Info

Publication number
JPS63246092A
JPS63246092A JP7756687A JP7756687A JPS63246092A JP S63246092 A JPS63246092 A JP S63246092A JP 7756687 A JP7756687 A JP 7756687A JP 7756687 A JP7756687 A JP 7756687A JP S63246092 A JPS63246092 A JP S63246092A
Authority
JP
Japan
Prior art keywords
signal
circuit
color
chromakey
key
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
JP7756687A
Other languages
Japanese (ja)
Inventor
Yuichi Koyama
小山 裕一
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP7756687A priority Critical patent/JPS63246092A/en
Publication of JPS63246092A publication Critical patent/JPS63246092A/en
Pending legal-status Critical Current

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  • Processing Of Color Television Signals (AREA)

Abstract

PURPOSE:To execute a shadow chromakey having little noise in a shadow part by removing the high frequency noise of a luminance signal, synthesizing a background and a shadow and synthesizing again an object with a chromakey signal. CONSTITUTION:R, G and B signals from a camera device 1 are converted into luminance signals with a matrix circuit 2 and a noise removal is executed with a low pass filter circuit 3. For the output, a chromakey back part comes to be a 100% key signal with a key signal shaping circuit 4 and a luminance key signal, in which a shadow part comes to be a half key level, is generated. Into the signal, a background signal 11 and a back color signal 12 are inputted with a video mixing circuit 5. A matrix circuit 6 converts an input into chrominance signals of I and Q, obtains a linear chromakey signal in a color selecting circuit 7 and obtains a chromakey signal with a key signal shaping circuit 8. A color eliminating circuit 9 executes the keying of the input with the signal of the circuit 7, obtains a cancel video signal and obtains a synthesized output with a video mixing circuit 10.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はテレビジョン特殊効果装置に係り、特にシャド
ークロマキー装置に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a television special effects device, and particularly to a shadow chromakey device.

〔従来の技術〕[Conventional technology]

従来、この種のシャドークロマキー装置ハ、パックグラ
ンド入力信号とバツクカラー入力信号を合成するキー信
号としてクロマキー信号を使用してい次。
Conventionally, this type of shadow chroma key device uses a chroma key signal as a key signal to synthesize a back ground input signal and a back color input signal.

〔発明が解決し1うとする問題点〕 前述した従来のシャドークロマキー装置では、゛クロマ
キー信号に工って影部分の合成を行っていた九め、影部
分のS/N比が悪いという問題点かあつ几。
[Problems to be Solved by the Invention] The conventional shadow chroma key device described above has the problem that the S/N ratio of the shadow part is poor because the shadow part is synthesized by modifying the chromakey signal. Kaatsu 几.

c問題点を解決するための手段〕 本発明のシャドークロマキー装置は、カメラ装置からの
R,G、B信号工り輝度信号を出力する第1のマトリク
ス回路と、この第1のマトリクス回路からの輝度信号の
高域ノイズを除去するローパスフィルター回路と、この
ローパスフィルター回路の出力を受けルミナンスキー信
号を発生する第1のキー信号成形回路と、この第1のキ
ー信号成形回路からのルミナンスキー信号によりバック
グランド入力信号とバツクカラー入力信号を合成する第
1の映像混合回路と、上記カメラ装置のR2O,B信号
からItQ信号を出力するwc2のマトリクス回路と、
この第2のマトリクス回路からのI、QgI号より色選
択を行う色義択回路と、この色選択回路によって色選択
され几信号を受けクロマキー信号を発生する第2のキー
信号成形回路と、上記カメラ装置からのNTSC信号を
受け上記色選択1gJW&の出力信号によって色消去を
行う色消去回路と、上記第2のキー信号成形回路からの
クロマキー信号に工って上記第1の映像混合回路の出力
信号と上記色消去回路の出力信号を合成して出力する第
2の映像混合回路とを備えてなるようにしたものである
Means for Solving Problem c] The shadow chromakey device of the present invention includes a first matrix circuit that outputs R, G, and B signal-processed luminance signals from a camera device, and a A low-pass filter circuit that removes high-frequency noise from a luminance signal, a first key signal shaping circuit that receives the output of this low-pass filter circuit and generates a luminance key signal, and a luminance key signal from this first key signal shaping circuit. a first video mixing circuit that combines a background input signal and a back color input signal; a wc2 matrix circuit that outputs an ItQ signal from the R2O and B signals of the camera device;
a color selection circuit that selects a color from the I and QgI signals from this second matrix circuit; a second key signal forming circuit that receives a color signal selected by this color selection circuit and generates a chromakey signal; A color erasing circuit that receives the NTSC signal from the camera device and erases the color using the output signal of the color selection 1gJW&, and outputs the first video mixing circuit based on the chromakey signal from the second key signal forming circuit. The image forming apparatus includes a second video mixing circuit which combines the signal and the output signal of the color erasing circuit and outputs the resultant signal.

〔作 用〕[For production]

本発明においては、輝度信号をローパスフィルター回路
を通すことにエフ高域ノイズの除去をし、のクロマキー
信号を用いてバックグランドと影の合成画に対してさら
に被写体を合成する。
In the present invention, high-frequency noise is removed by passing the luminance signal through a low-pass filter circuit, and the subject is further synthesized with the background and shadow composite image using the chromakey signal.

〔実施例〕〔Example〕

以下、図面に基づき本発明の実施例を詳細に説明する。 Embodiments of the present invention will be described in detail below based on the drawings.

第1図は本発明の一実施例を示すブロック図である。FIG. 1 is a block diagram showing one embodiment of the present invention.

図において、1はカメラ装置、2はこのカメラ装置1か
らのR,G、B信号エフ輝度信号を出力するマトリクス
回路、3はこのマトリクス回路2からの輝度信号の高域
ノイズを除去するローパスフィルター回路、4はこのロ
ーパスフィルター回路3の出力を受けルきナンスキー信
号を発生するキー信号成形回路、5はこのキー信号成形
回路4からのルミナンスキー信号に1クバックグランド
入力信号11とバツクカラー入力信号12を合成する映
像混合N路、6はカメラ装置1のR,G、B信号からI
tQ信号を出力するマトリクス回路、Tはこのマトリク
ス回路6からのI、Q信号工す色選択を行う色選択回路
、8はこの色選択回路7に工って色選択された信号を受
けクロマキー信号を発生するキー信号成形回路、9はカ
メラ装置°1からのNTSC信号全信号上受色選択回路
7の出力信号によって色消去を行う色消去(9)路、1
0は上記キー信号成形回路8からのクロマキー信号に1
って上記映像混合回路5の出力信号と上記色消去回路9
の出力信号を合成して出力する映像混合回路である。そ
して、13は合成出力信号である。
In the figure, 1 is a camera device, 2 is a matrix circuit that outputs R, G, and B signal F luminance signals from this camera device 1, and 3 is a low-pass filter that removes high-frequency noise from the luminance signals from this matrix circuit 2. 4 is a key signal forming circuit that receives the output of this low-pass filter circuit 3 and generates a non-key signal, and 5 is a background input signal 11 and a back color input signal 12 which are connected to the luminance key signal from this key signal forming circuit 4. A video mixing N path 6 synthesizes the I from the R, G, B signals of the camera device 1.
A matrix circuit that outputs the tQ signal, T is a color selection circuit that selects a color for processing the I and Q signals from this matrix circuit 6, and 8 is a color selection circuit that outputs the color selection signal from this color selection circuit 7 and receives a chromakey signal. 9 is a color erasing circuit (9) for erasing colors using the output signal of the color receiving selection circuit 7 on the entire NTSC signal from the camera device °1;
0 is 1 for the chroma key signal from the key signal forming circuit 8.
The output signal of the video mixing circuit 5 and the color erasing circuit 9
This is a video mixing circuit that synthesizes and outputs the output signals of. And 13 is a composite output signal.

lE2図は第1図の動作説明に供する各部の波形を示す
波形図で、(a)はカメラ装置1の出力信号を示し几も
のであり、(b)はマトリクス回路2の出力である(a
)のA−A’の輝度信号、(C)はキー信号成形回路4
の出力であるルミナンスキー信号、(d)は色選択回路
7の出力である(a)のA−A’のリニアクロマキー信
号、(e)はキー信号成形回路8の出力であるクロマキ
ー信号を示したものである。
1E2 is a waveform diagram showing the waveforms of each part to provide an explanation of the operation of FIG.
), the luminance signal of A-A', (C) is the key signal forming circuit 4
(d) shows the linear chroma key signal of A-A' in (a) which is the output of the color selection circuit 7, and (e) shows the chroma key signal which is the output of the key signal forming circuit 8. It is something that

そして、第2図(a)において、ff)は被写体を示し
、(ロ)は影を示す。まtl(ハ)はクロマキーバック
を示す。
In FIG. 2(a), ff) indicates the subject, and (b) indicates the shadow. Matl (c) indicates chromakey back.

つぎに第1図に示す実施例の動作を第2図を参照して説
明する。
Next, the operation of the embodiment shown in FIG. 1 will be explained with reference to FIG. 2.

まず、カメラ装置1からの出力R,G、B信号はマトリ
クス回路2にて輝度信号に変換される。
First, the output R, G, and B signals from the camera device 1 are converted into luminance signals by the matrix circuit 2.

そして、カメラ出力信号を示す第2図(a)における被
写体0)の影(ロ)の部分は輝度レベルが低(高域ノイ
ズを多(含んでいる。−万、影(ロ)の部分は一般的に
空間周波数の低い部分にそのスペクトルが分布している
。そこで、ローパスフィルター回b!f!3KLってノ
イズ部分を除去することが可能である。
In Figure 2 (a) showing the camera output signal, the shaded part (b) of subject 0 has a low brightness level (contains a lot of high-frequency noise). Generally, the spectrum is distributed in the low spatial frequency part.Therefore, it is possible to remove the noise part by using a low-pass filter b!f!3KL.

このローパスフィルター回路3の出力全キー信号成形回
路4によってm2図(a)に示すクロマキーバンクCう
の部分が100%キー信号となり、影(ロ)の部分がハ
ーフキーレベルとなる工うにルミナンスキー信号を発生
する。このときの波形を第2図(b)。
The entire output key signal forming circuit 4 of the low-pass filter circuit 3 turns the chroma key bank C shown in Figure (a) into a 100% key signal, and the shaded part becomes a half-key level (luminance key). Generate a signal. The waveform at this time is shown in Figure 2(b).

(c)に示す。Shown in (c).

そして、このルミナンスキー信号の被写体部分ij バ
ー 7キーレベルであるが、この部分は次段の映像混合
回路10でキーイングされ被写体が入るので問題はない
。そして、ルミナンスキー信号を示す第2図(C)にお
ける100Xキー信号の部分にはバックグランド信号1
1が入り、OXキー信号の部分にはバックカラー信号1
2が入るように映像混合回路5でリニアなキーイングを
行う。
The object part of this luminance key signal ij bar is at the 7 key level, but there is no problem because this part is keyed by the next-stage video mixing circuit 10 and contains the object. In the part of the 100X key signal in FIG. 2 (C) showing the luminance key signal, there is a background signal 1.
1 is entered, and the back color signal 1 is entered in the OX key signal part.
Linear keying is performed by the video mixing circuit 5 so that 2 is entered.

また、カメラ装置1からのR,G、B信号をマトリクス
回路6にてItQO色信号に変換する。
Further, the R, G, and B signals from the camera device 1 are converted into ItQO color signals by the matrix circuit 6.

このItQの色信号エフ色選択回路Tにてクロマキーバ
ックの色を選択し、リニアクロマキー信号を得る。そし
て、クロマキーバックに落ちた影部分についてもレベル
は小さいが同色のクロマ成分が含まれている。このリニ
アクロマキー信号をクロマキーバックお工び影部分のキ
ー信号が100%キー信号となる工うに、キー信号成形
口w58によつて成形しクロマキー信号を得る。このと
きの波形を第2図(d) 、 (e)に示す。
The color signal F color selection circuit T of this ItQ selects a chromakey back color to obtain a linear chromakey signal. The shadow part falling on the chroma key background also contains chroma components of the same color, although the level is small. This linear chroma key signal is shaped by a key signal forming port w58 to obtain a chroma key signal, so that the key signal in the shadow part becomes a 100% key signal after chroma key back processing. The waveforms at this time are shown in FIGS. 2(d) and (e).

つぎに、色消去間!9ではカメラ装置1からのNTSC
信号を入力とし、色選択回路7の出力であNTSC信号
と加算することに工ってキャンセルビデオ信号ヲ得てい
る。そして、このキャンセルビデオ信号と映像混合回路
5の出力であるバックグランドと影の合成信号を映像混
合回路10の入力として、クロマキー信号でキーイング
することに工って被写体と影とバックグランドの合成信
号が合成出力信号13として出力に得られる。
Next, during color erasing! 9, NTSC from camera device 1
A canceled video signal is obtained by inputting the signal and adding it to the NTSC signal at the output of the color selection circuit 7. The canceled video signal and the composite signal of the background and shadow, which is the output of the video mixing circuit 5, are input to the video mixing circuit 10, and the composite signal of the subject, shadow, and background is keyed with a chroma key signal. is obtained at the output as the composite output signal 13.

〔発明の効果〕〔Effect of the invention〕

以上説明した工うに、本発明によれば、輝度信号をロー
パスフィルター回路を通すことにエフ高域ノイズの除去
をし、これを用いてパンクグランAシ トと影の合成を行い、その後、クロマ信号に1って得ら
れた被写体部分のクロマキー信号を用いてバックグラン
ドと影の合成画に対してさらに被写体を合成することに
工p1影部分のノイズの少ないシャドクロマキーを行う
ことができるので、実用上の効果は極めて大である。
As described above, according to the present invention, high-frequency noise is removed by passing the luminance signal through a low-pass filter circuit, and this is used to synthesize punk gran A and shadow, and then the chroma signal is Using the chromakey signal of the subject area obtained in step 1 to further synthesize the subject into the composite image of the background and shadows, it is possible to perform shadow chromakey with less noise in the shadow area, making it practical The above effect is extremely large.

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

第1図は本発明の一実施例を示すブロック図、第2図は
第1図の動作説明に供する谷部の波形を示す波形図であ
る。 1・・・・カメラ装置、2・・・・マトリクス回路、3
・・・・ローパスフィルター回路、4・・・・キー信号
成形回路、5・・・・映像混合回路、6・・・・マトリ
クス回路、T・・・・色選択回路、8・・・・キー信号
成形回路、9・・・・色消去回路、10・・・・映像混
合回路。
FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a waveform diagram showing waveforms at valley portions for explaining the operation of FIG. 1... Camera device, 2... Matrix circuit, 3
...Low pass filter circuit, 4...Key signal forming circuit, 5...Video mixing circuit, 6...Matrix circuit, T...Color selection circuit, 8...Key Signal shaping circuit, 9...color erasing circuit, 10...video mixing circuit.

Claims (1)

【特許請求の範囲】[Claims] カメラ装置からのR、G、B信号より輝度信号を出力す
る第1のマトリクス回路と、この第1のマトリクス回路
からの輝度信号の高域ノイズを除去するローパスフイル
ター回路と、このローパスフイルター回路の出力を受け
ルミナンスキー信号を発生する第1のキー信号成形回路
と、この第1のキー信号成形回路からのルミナンスキー
信号によりバツクグランド入力信号とバツクカラー入力
信号を合成する第1の映像混合回路と、前記カメラ装置
のR、G、B信号からI、Q信号を出力する第2のマト
リクス回路と、この第2のマトリクス回路からのI、Q
信号より色選択を行う色選択回路と、この色選択回路に
よつて色選択された信号を受けクロマキー信号を発生す
る第2のキー信号成形回路と、前記カメラ装置からのN
TSC信号を受け前記色選択回路の出力信号によつて色
消去を行う色消去回路と、前記第2のキー信号成形回路
からのクロマキー信号によつて前記第1の映像混合回路
の出力信号と前記色消去回路の出力信号を合成して出力
する第2の映像混合回路とを備えてなることを特徴とす
るシヤドークロマキー装置。
a first matrix circuit that outputs a luminance signal from the R, G, and B signals from the camera device; a low-pass filter circuit that removes high-frequency noise from the luminance signal from the first matrix circuit; a first key signal forming circuit that receives an output and generates a luminance key signal; and a first video mixing circuit that synthesizes a background input signal and a back color input signal using the luminance key signal from the first key signal forming circuit. , a second matrix circuit that outputs I, Q signals from the R, G, B signals of the camera device, and I, Q signals from the second matrix circuit.
a color selection circuit that selects a color from a signal; a second key signal forming circuit that receives a signal selected by the color selection circuit and generates a chroma key signal;
a color erasing circuit that receives a TSC signal and performs color erasing using the output signal of the color selection circuit; and a chromakey signal from the second key signal forming circuit that erases the output signal of the first video mixing circuit and the color selection circuit; A shadow chromakey device comprising: a second video mixing circuit that synthesizes and outputs the output signals of the color erasing circuit.
JP7756687A 1987-04-01 1987-04-01 Shadow chromakey device Pending JPS63246092A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7756687A JPS63246092A (en) 1987-04-01 1987-04-01 Shadow chromakey device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7756687A JPS63246092A (en) 1987-04-01 1987-04-01 Shadow chromakey device

Publications (1)

Publication Number Publication Date
JPS63246092A true JPS63246092A (en) 1988-10-13

Family

ID=13637561

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7756687A Pending JPS63246092A (en) 1987-04-01 1987-04-01 Shadow chromakey device

Country Status (1)

Country Link
JP (1) JPS63246092A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0419126A2 (en) * 1989-09-22 1991-03-27 Ampex Corporation System for generating anti-aliased video signal
JPH0564078A (en) * 1991-08-30 1993-03-12 Victor Co Of Japan Ltd Video signal processing circuit
GB2267409A (en) * 1992-05-26 1993-12-01 Grass Valley Group Adding a shadow to a video image

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0419126A2 (en) * 1989-09-22 1991-03-27 Ampex Corporation System for generating anti-aliased video signal
JPH0564078A (en) * 1991-08-30 1993-03-12 Victor Co Of Japan Ltd Video signal processing circuit
GB2267409A (en) * 1992-05-26 1993-12-01 Grass Valley Group Adding a shadow to a video image
GB2267409B (en) * 1992-05-26 1995-11-15 Grass Valley Group Method of and apparatus for processing a shaped video signal to add a simulated shadow

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