JPS60114097A - Correction circuit of color difference signal - Google Patents
Correction circuit of color difference signalInfo
- Publication number
- JPS60114097A JPS60114097A JP58222450A JP22245083A JPS60114097A JP S60114097 A JPS60114097 A JP S60114097A JP 58222450 A JP58222450 A JP 58222450A JP 22245083 A JP22245083 A JP 22245083A JP S60114097 A JPS60114097 A JP S60114097A
- Authority
- JP
- Japan
- Prior art keywords
- color difference
- difference signal
- correction circuit
- address data
- color
- 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
Links
- 101100087530 Caenorhabditis elegans rom-1 gene Proteins 0.000 claims 1
- 101100305983 Mus musculus Rom1 gene Proteins 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000001228 spectrum Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 9
- 239000002131 composite material Substances 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 101100524644 Toxoplasma gondii ROM4 gene Proteins 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/80—Camera processing pipelines; Components thereof
- H04N23/84—Camera processing pipelines; Components thereof for processing colour signals
- H04N23/88—Camera processing pipelines; Components thereof for processing colour signals for colour balance, e.g. white-balance circuits or colour temperature control
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (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、カラービデオカメラ等の用いられる色差信号
補正回路に関するものである０従来例の構成とその問題
点
カラービデオカメラ等のカラー撮像装置には、色差信号
補正回路があり、従来第１図のような構成で、備わって
いる。光電変換された映像信号から直接つくられた色差
信号（Ｒ−Ｙ ）０． （Ｂ−Ｙ）ｉは１色誤差を含ん
でいるので、これを補正しなければならない。そこで、
第１図に示すように、もとの色差信号（ＲＹ）ｉ 、（
Ｂ ”）ｉの加算比を、乗算器１０１ 、１０２ 、１
０３ 、１０４で調整し。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a color difference signal correction circuit used in a color video camera, etc.The present invention relates to a color difference signal correction circuit used in a color video camera, etc. , a color difference signal correction circuit, which is conventionally provided with a configuration as shown in FIG. A color difference signal (R-Y) created directly from a photoelectrically converted video signal. Since (B-Y)i includes a one-color error, this must be corrected. Therefore,
As shown in FIG. 1, the original color difference signal (RY) i, (
B'') i is added to the multipliers 101, 102, 1
Adjust with 03 and 104.
新しい色差信号（ＲＹ）ｏ 、（Ｂ Ｙ）ｏをつくり、
こ九を補正された色差信号として用いている０すなわら
、（Ｒ−Ｙ）ｉ 、（１３−Ｙ）ｉと（Ｒ−Ｙ）。Create new color difference signals (RY)o, (B Y)o,
0, that is, (RY)i, (13-Y)i, and (RY), which are used as corrected color difference signals.
（Ｂ−Ｙ）。との関係は、以下のように表すことができ
る。(B-Y). The relationship can be expressed as follows.
（Ｒ−Ｙ）。＝ａ −（Ｒ−Ｙ ）、＋ｂ −（Ｒ−Ｙ
）ｉ（Ｂ−Ｙ）。＝Ｃ・（Ｒ−Ｙ）ｉ＋ｄ・（Ｂ−Ｙ
）、上式の定数’ ｌ ｂ＃ Ｃｔ ｄを適当に調整す
ることで、色差信号は補正される。(RY). =a −(R−Y), +b−(R−Y
)i(B-Y). =C・(R−Y)i+d・(B−Y
), the color difference signal is corrected by appropriately adjusting the constant ' l b# Ct d in the above equation.
しかしながら、上記のような構成では、補正操作は全て
線形性を有しているので、色誤差も線形性をもつものし
か除去できない。しだがって、非線形性を有する色ひず
み等は取除くことができず。However, in the above configuration, since all correction operations have linearity, only color errors that have linearity can be removed. Therefore, it is not possible to remove color distortion etc. that have non-linearity.
画質が劣化するという問題点を有している○発明の目的 本発明は、上記従来の問題点を解消するもので。○Object of the invention has the problem of deterioration of image quality The present invention solves the above-mentioned conventional problems.
もとの色差信号に含まれるあらゆる色誤差を除去し１完
全に補正された色差信号が得られる色差信号補正回路を
提供することを目的とする。It is an object of the present invention to provide a color difference signal correction circuit that can remove all color errors contained in the original color difference signal and obtain a completely corrected color difference signal.
発明の構成
本発明は、デジタル色差信号をアドレスデータとし、Ｒ
ＯＭ（読出専用記憶装置）を用いて所要の色差信号出力
データを得る色差信号補正回路であり、ＲＯＭによりあ
らゆる色差信号の完全補正を行なうことができるもので
ある。Structure of the Invention The present invention uses a digital color difference signal as address data, and R
This is a color difference signal correction circuit that uses an OM (read-only memory device) to obtain required color difference signal output data, and can perform complete correction of all color difference signals using a ROM.
実施例の説明
第２図は、本発明の第１の実施例における色差信号補正
回路の構成図である。DESCRIPTION OF EMBODIMENTS FIG. 2 is a configuration diagram of a color difference signal correction circuit in a first embodiment of the present invention.
色差信号（Ｒ−Ｙ）、に１ （Ｂ−Ｙ）ｉ信号の定数倍
（Ｋ倍）を加算して、デジタル色差信号（Ｒ−Ｙ）ｃを
つくり、これをＲＯＭ２０１のアドレスデータとして用
いている。A constant multiple (K times) of the 1 (B-Y) i signal is added to the color difference signal (R-Y) to create a digital color difference signal (R-Y) c, which is used as the address data of the ROM 201. There is.
ＲＯＭ２０１．２０２に、それぞれ（Ｒ−Ｙ）。。(RY) in ROM201 and 202, respectively. .
（Ｂ−Ｙ）工がアドレスデータとして与えられると、そ
れに対応した出力データ（Ｒ−Ｙ）。、（Ｂ−Ｙ）。When (B-Y) is given as address data, the corresponding output data (R-Y). , (B-Y).
が取出される。特と、（Ｒ−Ｙ）Ｏは、（ＲＹ）ｉ。is taken out. In particular, (RY)O is (RY)i.
（Ｂ−Ｙ）、の両方の信号量により、補正された出力デ
ータである。This is output data corrected by the signal amounts of both (B-Y).
この出力データは、撮像デバイスの光電変換特性、フィ
ルタの分光特性などから、実験的および理論的に算出す
ることができ、あらかじめＲＯＭ２０１．２０２に書込
まれている。This output data can be calculated experimentally and theoretically from the photoelectric conversion characteristics of the imaging device, the spectral characteristics of the filter, etc., and is written in the ROMs 201 and 202 in advance.
なお、（Ｂ ｙ）、信号を補正する必要がない場合は、
ＲＯＭ２０２は省略できる。また、デジタル固定データ
に２０３がゼロのときは、（Ｒ−Ｙ）。In addition, (B y), if there is no need to correct the signal,
The ROM 202 can be omitted. Also, when 203 is zero in the digital fixed data, (RY).
は（Ｒ−Ｙ）、と等しくなり、（Ｂ−Ｙ）ｉ信号の影響
を受けない。is equal to (RY), and is not affected by the (B-Y)i signal.
第３図は、本発明の第２の実施例）Ｃおける色差信号補
正回路の構成図である。FIG. 3 is a block diagram of a color difference signal correction circuit in a second embodiment (C) of the present invention.
誤差信号を含んだもとの色差信号（Ｒ−Ｙ）工。The original color difference signal (RY) including the error signal.
（Ｂ −Ｙ ）ｉのビット数を、それぞれにビ・ｙト、
１１ビツトとすると、ＲＯＭ３０１に供給されるアドレ
スデータは、ｅｋ＋ｌビ・ントとなる。すなわら１２つ
の色差信号（Ｒ−Ｙ）、、（Ｂ−Ｙ）ｉを用いて、１つ
のアドレスデータがつくられるわけである。(B − Y ) Let the number of bits of i be yt,
If it is 11 bits, the address data supplied to the ROM 301 will be ek+l bits. That is, one address data is created using 12 color difference signals (RY), . . . (B-Y)i.
このとき、（Ｒ−Ｙ）。信号が、出力データとして、完
全に補正される。（Ｂ−Ｙ）ｉ信号に誤差がなければ、
それはそのまま（Ｂ−Ｙ）。とじて用いることができ、
１軸（この場合（Ｒ−Ｙ）軸）だけの補正で十分である
。At this time, (RY). The signal is fully corrected as output data. (B-Y) If there is no error in the i signal,
It remains as it is (B-Y). Can be used by closing
Correction of only one axis (in this case the (RY) axis) is sufficient.
第４図は、本発明の第３の実施例における色差信号補正
回路の構成図である。FIG. 4 is a configuration diagram of a color difference signal correction circuit in a third embodiment of the present invention.
第３図と異なる部分は、出力データが（ｍ＋ｎ）ビット
であり、上位ｍビット、下位ｎビットがそれぞれ完全補
正された色差信号（Ｒ−Ｙ）。 。The difference from FIG. 3 is that the output data is (m+n) bits, and the upper m bits and lower n bits are completely corrected color difference signals (RY). .
（Ｂ−Ｙ）Ｏのデータとなる点である。そのため、たと
えばｍ＝ｎ （ビット）のとき、ＲＯＭ４ｏ１の容量は
、第３図のＲＯＭ３０１の容量の２倍必要となる。しか
し、この場合は、完全な２軸補正であ臥 也１’＋＾１
路舌ε竜す面勝／とト砧τテ甑スー第６図は、ＲＯＭ４
０１を用いた色補正の関係を、色差信号の合成ベクトル
図で示したものである。This is the point that becomes the data of (B-Y)O. Therefore, for example, when m=n (bits), the capacity of the ROM4o1 is required to be twice the capacity of the ROM301 in FIG. However, in this case, with complete two-axis correction,
The 6th figure is ROM4
The relationship of color correction using 01 is shown in a composite vector diagram of color difference signals.
同図ａの被写体本来の色差信号ベクトル（）ｌ−Ｙ）ｓ
、 （Ｂ −Ｙ ）ｓは、撮像デバイスの特性や種々の
信号処理のため、同図すのように変化してしまう。これ
は、線形、非線形ひずみを問わず。The original color difference signal vector ()l−Y)s of the subject in the same figure a
, (B-Y)s change as shown in the figure due to the characteristics of the imaging device and various signal processing. This applies regardless of linear or nonlinear distortion.
色誤差を含んだ色差信号ベクトルである。This is a color difference signal vector containing color errors.
しかし、上記ＲＯＭ４０１を介して、同図Ｃに示すよう
に完全補正された色差信号（Ｒ−Ｙ）。。However, the color difference signal (R-Y) is completely corrected via the ROM 401 as shown in FIG. .
（Ｂ−Ｙ）。を得ることができ、どんな場合でも完全な
補正が可能となる。すなわらｔ （Ｒ−ｙ）。。(B-Y). can be obtained, making complete correction possible in any case. That is, t (R-y). .
（Ｂ−Ｙ）。ｌｄ、それぞれ（Ｒ−Ｙ ）ｓ、 （Ｂ−
Ｙ ）Ｓと同じものとなる０
また、必ずしも（ｉｔ Ｙ ）ｏ 、 （Ｂ Ｙ ）ｏ
を（Ｒ−Ｙ）ｓ（Ｂ −Ｙ ）ｓと等しくする必要はな
く、たとえば肌色を際立たせたりするなど１種々の特性
を強調するためＶこ、任意に調整することができる。(B-Y). ld, respectively (RY)s, (B-
Y ) 0 which is the same as S Also, not necessarily (it Y )o, (B Y )o
It is not necessary to make V equal to (RY)s(B-Y)s, and V can be arbitrarily adjusted to emphasize various characteristics, such as to make skin tone stand out.
発明の効果
本発明の色差信号補正回路は、デジタル色差信号をアド
レスデータとし、ＲＯＭを設けることにより、色差信号
出力データを得ることができるものである。したがって
、線形色誤差だけでなく、非線形性を有する色ひずみも
除去することができる。また１色差信号の特性を任意に
与えることができるので、用途などに応じて最も適しだ
色特性を得ることも可能である。Effects of the Invention The color difference signal correction circuit of the present invention can obtain color difference signal output data by using a digital color difference signal as address data and providing a ROM. Therefore, not only linear color errors but also nonlinear color distortions can be removed. Furthermore, since the characteristics of one color difference signal can be arbitrarily given, it is also possible to obtain the most suitable color characteristics depending on the application.
さらに、色補正のだめの複雑な四則演算を行なうことが
なく、ＲＯＭだけの簡単な回路構成で済み、その効果は
非常に大きい。Furthermore, there is no need to perform the four complicated arithmetic operations required for color correction, and a simple circuit configuration consisting only of a ROM is sufficient, which is very effective.
第１図は従来の色差信号補正回路の構成を示すブロック
図、第２図は本発明の第１の実施例における色差信号補
正回路の構成を示すブロック図。
第３図は本発明の第２の実施例における色差信号補正回
路の構成を示すブロック図、第４図は本発明の第３の実
施例における色差信号補正回路の構成を示すブロック図
、第６図は本発明における色誤差補正を説明するための
色差信号の合成ベクトル図である。
２０１．２０２・・・・・ＲＯＭ、２０３・・・・！デ
ジタル固定データ、３０１．４０１・・・・・ＲＯＭ。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名″″
″ 穂
日
拓Ｃ
ネ
侶す
￥５図
（ごりし） に；）
−Ｙ
（０）FIG. 1 is a block diagram showing the configuration of a conventional color difference signal correction circuit, and FIG. 2 is a block diagram showing the configuration of the color difference signal correction circuit in a first embodiment of the present invention. FIG. 3 is a block diagram showing the configuration of the color difference signal correction circuit in the second embodiment of the present invention, FIG. 4 is a block diagram showing the configuration of the color difference signal correction circuit in the third embodiment of the present invention, and FIG. The figure is a composite vector diagram of color difference signals for explaining color error correction in the present invention. 201.202...ROM, 203...! Digital fixed data, 301.401...ROM. Name of agent: Patent attorney Toshio Nakao and one other person
″ Hohi Taku C Nesuisu ￥5 (Gorishi) ni;) -Y (0)
Claims (3)
（読出専用記憶装置）を用いて、所要の色差信号出力デ
ータを得ることを特徴とする色差信号補正回路。(1) Digital color difference signal is used as address data, and ROM
1. A color difference signal correction circuit that obtains required color difference signal output data using a read-only storage device.
て、一方の色差信号に他方の色差信号の定数倍したもの
を加えた色差信号をアドレスデータとすることを特徴と
する特許請求の範囲第１項記載の色差信号補正回路。(2) Regarding two linearly independent and different digital color difference signals, address data is a color difference signal obtained by adding one color difference signal multiplied by a constant of the other color difference signal. The color difference signal correction circuit described in .
て１つのアドレスデータとすることを特徴とする特許請
求の範囲第１項記載の色差信号補正回路。(3) The color difference signal correction circuit according to claim 1, wherein two linearly independent and different digital color difference signals are used to form one address data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58222450A JPS60114097A (en) | 1983-11-25 | 1983-11-25 | Correction circuit of color difference signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58222450A JPS60114097A (en) | 1983-11-25 | 1983-11-25 | Correction circuit of color difference signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60114097A true JPS60114097A (en) | 1985-06-20 |
Family
ID=16782593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58222450A Pending JPS60114097A (en) | 1983-11-25 | 1983-11-25 | Correction circuit of color difference signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60114097A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01318484A (en) * | 1988-06-20 | 1989-12-22 | Sony Corp | Chrominance signal corrector |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5738092A (en) * | 1980-08-18 | 1982-03-02 | Nec Corp | Compensator for differentiation phase |
| JPS5820094A (en) * | 1981-07-29 | 1983-02-05 | Toshiba Corp | Video processing circuit |
| JPS59148486A (en) * | 1983-02-08 | 1984-08-25 | アイテイ−テイ−・インダストリ−ズ・インコ−ポレ−テッド | Skin color correcting circuit |
-
1983
- 1983-11-25 JP JP58222450A patent/JPS60114097A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5738092A (en) * | 1980-08-18 | 1982-03-02 | Nec Corp | Compensator for differentiation phase |
| JPS5820094A (en) * | 1981-07-29 | 1983-02-05 | Toshiba Corp | Video processing circuit |
| JPS59148486A (en) * | 1983-02-08 | 1984-08-25 | アイテイ−テイ−・インダストリ−ズ・インコ−ポレ−テッド | Skin color correcting circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01318484A (en) * | 1988-06-20 | 1989-12-22 | Sony Corp | Chrominance signal corrector |
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