JPH0332147Y2 - - Google Patents
Info
- Publication number
- JPH0332147Y2 JPH0332147Y2 JP9361584U JP9361584U JPH0332147Y2 JP H0332147 Y2 JPH0332147 Y2 JP H0332147Y2 JP 9361584 U JP9361584 U JP 9361584U JP 9361584 U JP9361584 U JP 9361584U JP H0332147 Y2 JPH0332147 Y2 JP H0332147Y2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- video signal
- color
- color erasing
- 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.)
- Expired
Links
- 238000000926 separation method Methods 0.000 claims description 5
- 239000000654 additive Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003086 colorant Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
Landscapes
- Processing Of Color Television Signals (AREA)
Description
【考案の詳細な説明】
「産業上の利用分野」
本考案は、カラーテレビジヨンのクロマキー信
号発生装置に関し、特にその中に用いられる色消
去回路に関する。[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a chromakey signal generating device for color television, and particularly to a color erasing circuit used therein.
「従来の技術」
従来のクロマキー信号発生装置においては、ゲ
ート方式色消去回路又は、加算方式色消去回路の
どちらか一方でしか色消去を行つていなかつた。
ところで、ゲート方式色消去回路の場合は、輪郭
のはつきりしないソフトクロマキー画面合成を行
う時、色消去が不完全となる問題点あつた。他
方、加算方式色消去回路の場は、操作が容易では
ない、又、操作を容易にするために自動化にする
と複雑となり高価になる。さらに加算方式色消去
回路で色変換を行う場合にキヤンセル信号のカラ
ー位相を可変して行うが一定レベルの振幅ままで
色変換を行う事ができないなどの問題点があつ
た。"Prior Art" In conventional chroma key signal generating devices, color erasure has been performed only with either a gate type color erasing circuit or an additive color erasing circuit.
By the way, in the case of the gate type color erasing circuit, there is a problem that color erasing is incomplete when synthesizing a soft chroma key screen in which the outline is not sharp. On the other hand, additive color cancellation circuits are not easy to operate, and automation to facilitate operation would be complex and expensive. Furthermore, when color conversion is performed using an additive color cancellation circuit, the color phase of the cancel signal is varied, but there are problems in that color conversion cannot be performed while the amplitude remains at a constant level.
「考案が解決しようとする問題点」
したがつて本考案の目的は、ソフトクロマキー
画面合成にも、操作の自動化にも容易に対応でき
るクロマキー信号発生装置の色消去回路を提供す
ることである。``Problems to be Solved by the Invention'' Accordingly, an object of the present invention is to provide a color erasing circuit for a chroma key signal generating device that can be easily adapted to both soft chromakey screen composition and automated operation.
「問題点を解決するための手段」
本考案によれば、ゲート方式色消去回路と加算
方式色消去回路とを切替回路を介して直列に構成
したクロマキー信号発生装置の色消去回路が得ら
れる。"Means for Solving the Problems" According to the present invention, a color erasing circuit for a chromakey signal generating device is obtained in which a gate type color erasing circuit and an additive color erasing circuit are configured in series via a switching circuit.
「作用」
本考案においては、映像信号に合到した色消去
を選択できることで操作を容易にし、色変換を行
う時はゲート方式色消去回路でクロマ性分を除き
加算方式色消去回路でキヤンセル信号を加算する
事により一定振幅の色に変換できるものである。"Function" In this invention, the operation is facilitated by being able to select the color cancellation that matches the video signal, and when performing color conversion, the chroma component is removed by the gate type color cancellation circuit, and the cancel signal is sent by the addition type color cancellation circuit. By adding , it is possible to convert to a color with a constant amplitude.
「実施例」
以下本考案の一実施例の図面を参照して本考案
を説明する。第１図は本考案の一実施例を示す図
で、映像信号入力端子１からの映像信号１０１は
Ｙ／Ｃ分離回路１１と、ゲインコントロール回路
１２と切替回路１３に分配される。Ｙ／Ｃ分離回
路１１は前述の映像信号からＹ信号１０２のみを
分離し出力する。ゲインコントロール回路１２は
前述の映像信号と、Ｙ信号を、ハードクロマキー
信号入力端子２からのハードクロマキー１０３で
ゲインコントロールを行う。切替回路１３は、前
述の映像信号１０１とゲインコントロール回路１
２の出力１０４を制御入力端子４からの制御信号
に応じて切替える。加算回路１４は前述の切替回
路１４の出力と、キヤンセル信号入力端子３から
のキヤンセル信号１０５を加算し、出力端子５か
ら色消去映像信号１０６を出力する。尚、クロマ
キー効果におけるクロマキー信号の発生や色消去
（キヤンセル）信号については特願昭55−77411
号、77412号に示されており、詳細は省く。"Embodiment" The present invention will be described below with reference to drawings of an embodiment of the present invention. FIG. 1 shows an embodiment of the present invention, in which a video signal 101 from a video signal input terminal 1 is distributed to a Y/C separation circuit 11, a gain control circuit 12, and a switching circuit 13. The Y/C separation circuit 11 separates only the Y signal 102 from the aforementioned video signal and outputs it. The gain control circuit 12 performs gain control on the above-mentioned video signal and Y signal using a hard chroma key 103 from the hard chroma key signal input terminal 2. The switching circuit 13 connects the aforementioned video signal 101 and the gain control circuit 1.
The output 104 of 2 is switched according to the control signal from the control input terminal 4. The adder circuit 14 adds the output of the switching circuit 14 described above and the cancel signal 105 from the cancel signal input terminal 3, and outputs a color erased video signal 106 from the output terminal 5. Regarding the generation of chromakey signals and color cancellation signals in the chromakey effect, please refer to Japanese Patent Application No. 77411/1986.
No. 77412, the details are omitted.
第２図は第１図主要部の信号波形を示したもの
であり、切替回路１３はゲインコントロール回路
１２の出力を取つた時のものである。 FIG. 2 shows the signal waveform of the main part of FIG. 1, when the switching circuit 13 receives the output of the gain control circuit 12.
「考案の効果」
以上説明したように、本考案によれば、ソフト
クロマキーのときも色消去を完全に行え、また自
動化に適した色消去も可能とするクロマキー信号
発生装置の色消去回路が得られる。"Effects of the Invention" As explained above, the present invention provides a color erasing circuit for a chromakey signal generator that can completely erase colors even during soft chroma keying and also enables color erasing suitable for automation. It will be done.
第１図は本考案の一実施例を示すブロツク図、
第２図は第１図主要部の波形図である。
図で１……映像信号入力端子、２……ハードク
ロマキー信号入力端子、３……キヤンセル信号入
力端子、４……制御信号入力端子、５……出力端
子、１１……Ｙ／Ｃ分離回路、１２……ゲインコ
ントロール回路、１３……切替回路、１４……加
算回路、１０１……映像信号、１０２……Ｙ信
号、１０３……ハードクロマキー信号、１０４…
…クロマゲート映像信号、１０５……キヤンセル
信号、１０６……色消去映像信号。
FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is a waveform diagram of the main part of FIG. 1. In the figure, 1...video signal input terminal, 2...hard chroma key signal input terminal, 3...cancel signal input terminal, 4...control signal input terminal, 5...output terminal, 11...Y/C separation circuit, 12...Gain control circuit, 13...Switching circuit, 14...Addition circuit, 101...Video signal, 102...Y signal, 103...Hard chromakey signal, 104...
...Chroma gate video signal, 105... Cancel signal, 106... Color erased video signal.
Claims (1)
と、前記分離回路からの輝度信号と入力映像信号
とを受けハードクロマキー信号に応じて各信号の
ゲインを制御するゲインコントロール回路と、前
記ゲインコントロール回路の出力と入力映像信号
とを切替える切替回路と、前記切替回路の出力と
色消去信号とを加える加算回路とを具備し、前記
加算回路か色消去された映像信号を得るクロマキ
ー信号発生装置の色消去回路。 a separation circuit that separates a luminance signal from an input video signal; a gain control circuit that receives the luminance signal from the separation circuit and the input video signal and controls the gain of each signal according to a hard chroma key signal; A color erasing device for a chromakey signal generator, comprising a switching circuit that switches between an output and an input video signal, and an adding circuit that adds the output of the switching circuit and a color erasing signal, and the adding circuit obtains a color erasing video signal. circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9361584U JPS619986U (en) | 1984-06-22 | 1984-06-22 | Color erasing circuit of chromakey signal generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9361584U JPS619986U (en) | 1984-06-22 | 1984-06-22 | Color erasing circuit of chromakey signal generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS619986U JPS619986U (en) | 1986-01-21 |
| JPH0332147Y2 true JPH0332147Y2 (en) | 1991-07-08 |
Family
ID=30651451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9361584U Granted JPS619986U (en) | 1984-06-22 | 1984-06-22 | Color erasing circuit of chromakey signal generator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS619986U (en) |
-
1984
- 1984-06-22 JP JP9361584U patent/JPS619986U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS619986U (en) | 1986-01-21 |
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