JPS6033357B2 - Image quality improvement device for color television receivers - Google Patents
Image quality improvement device for color television receiversInfo
- Publication number
- JPS6033357B2 JPS6033357B2 JP54158546A JP15854679A JPS6033357B2 JP S6033357 B2 JPS6033357 B2 JP S6033357B2 JP 54158546 A JP54158546 A JP 54158546A JP 15854679 A JP15854679 A JP 15854679A JP S6033357 B2 JPS6033357 B2 JP S6033357B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- color difference
- circuit
- output
- luminance signal
- 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
- 230000005540 biological transmission Effects 0.000 claims description 15
- 238000012937 correction Methods 0.000 claims description 15
- 238000000605 extraction Methods 0.000 claims description 7
- 239000000284 extract Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 239000003086 colorant Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/646—Circuits for processing colour signals for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction, chrominance trapping filters
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
Description
【発明の詳細な説明】
本発明は、カラーテレビジョン画像の色の付し、た画像
部分の画質を改善する装置に関するもので、特に色付部
分の細かい画像を良好に再現する様にしたものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for adding color to a color television image and improving the image quality of the image portion, and in particular to an apparatus that satisfactorily reproduces fine images in the colored portion. It is.
第１図は従来のカラーテレビジョン受像機の一部をブロ
ック図で表わしたものである。同図において、ｍ信号（
中間周波数信号）は映像検波器１で検波され、輝度信号
増幅器２および帯域増幅器３に供給される。帯城増幅器
３は複合カラー映像信号に含まれる搬送色信号を取り出
して増幅し、３つの色差信号復調器４，５，６に供給す
る。上記色差信号復調器４，５，６は搬送色信号を復調
して３種類の色差信号Ｒ−Ｙ，Ｇ−Ｙ．８−Ｙを得、そ
れらを３つの加算器７，８，９に供給する。FIG. 1 is a block diagram showing a part of a conventional color television receiver. In the same figure, the m signal (
The intermediate frequency signal) is detected by a video detector 1 and supplied to a luminance signal amplifier 2 and a band amplifier 3. The Obishiro amplifier 3 takes out the carrier color signal included in the composite color video signal, amplifies it, and supplies it to three color difference signal demodulators 4, 5, and 6. The color difference signal demodulators 4, 5, and 6 demodulate the carrier color signal to produce three types of color difference signals R-Y, G-Y. 8-Y and feed them to three adders 7, 8, 9.
上記加算器７，８，９は、それぞれに供聯合された色差
信号と、輝度信号増幅器２より伝送された輝度信号とを
加算することにより３種の原色信号Ｒ，Ｇ，Ｂを作り、
それらを受像管１０に供給する。以上に述べた様な従来
のカラーテレビジョン受像機では、色差信号（例えば色
差信号復調器４のＲ−Ｙ出力）の帯域幅は、輝度信号増
幅器２より伝送される輝度信号の帯広幅よりかなり狭い
。The adders 7, 8, and 9 generate three primary color signals R, G, and B by adding the color difference signals combined with each other and the luminance signal transmitted from the luminance signal amplifier 2,
They are supplied to the picture tube 10. In the conventional color television receiver as described above, the bandwidth of the color difference signal (for example, the R-Y output of the color difference signal demodulator 4) is much larger than the bandwidth of the brightness signal transmitted from the brightness signal amplifier 2. narrow.
例えば通常のＮＴＳＣ方式のカラーテレビジョン受像機
では、輝度信号はＯＨＺ〜３ＭＨＺの周波数成分を含ん
でいるのに対し、色差信号は高々５００ＫＨ２までの周
波数成分しか含んでいない。従って色の付いた画像部分
では狭帯域の色差信号が主として画像を構成するので、
鮮鉄度の低いぼけた画像になつてしまう。本発明は、上
記のような従来方式にあった上記の欠点をなくすため、
色差信号の強度に応じて積極的に輝度信号の高周波成分
を混入させることにより着色画像部分の解像度を改善す
るようにした装置を提供するものであり、肌色部分に関
しての誤補正を除去できるようにしたことを特徴とする
。For example, in a normal NTSC color television receiver, the luminance signal includes frequency components of OHZ to 3 MHZ, whereas the color difference signal only includes frequency components of up to 500 KH2. Therefore, in colored image parts, narrowband color difference signals mainly constitute the image.
The result is a blurry image with low sharpness. In order to eliminate the above-mentioned drawbacks of the conventional method, the present invention has the following features:
The present invention provides a device that improves the resolution of a colored image portion by actively mixing high-frequency components of a luminance signal according to the intensity of a color difference signal, and is capable of eliminating erroneous corrections regarding skin color portions. It is characterized by what it did.
以下、図面に基づいて詳細に説明する。A detailed description will be given below based on the drawings.
第２図は本発明の一実施例を表わすブロック図である。FIG. 2 is a block diagram representing one embodiment of the present invention.
色差信号源１１は色差信号を発生するものであり、第１
図の色差信号復調器４，５，６のいずれかであってもよ
い。輝度信号源１２は輝度信号を発生するものであり、
第１図の輝度信号増中器２であってもよい。非直線伝送
回路１３は色差信号源１ １から色差信号を供給され、
同信号に非直線的伝送特性を与えた後、利得制御信号と
して出力するものである。高周波抽出回路１４は輝度信
号源１２から供給される輝度信号の高周波成分を取り出
すものであって、単なる高域通過フィル夕に限定されな
い。可変利得増中器１５は高周波抽出回路１４からの出
力の増中利得が非直線伝送回路よりの出力である利得制
御信号によって制御されるものである。利得を制御され
た輝度信号の高周波成分は、補正信号として加算装置１
６に供給され、ここで色差信号、輝度信号と加算されて
映像表示に供せられる。この加算装置１６は映像を合成
するという意味での広義の加算装置であり、単なる電子
回路に限定されず、例えば受像管の電子銃における合成
や、発光段階での合成をも含んでいる。本実施例によれ
ば、帯城中の狭い色差信号が広帯域の輝度信号に重なっ
て着色画像部分の解像度を低下させればさせるほど、大
きな補正信号が加算装置１６に伝送され、解像度を改善
する。The color difference signal source 11 generates a color difference signal, and the first
It may be any of the color difference signal demodulators 4, 5, and 6 shown in the figure. The luminance signal source 12 generates a luminance signal,
The brightness signal intensifier 2 shown in FIG. 1 may also be used. The non-linear transmission circuit 13 is supplied with a color difference signal from the color difference signal source 11,
This signal is given non-linear transmission characteristics and then output as a gain control signal. The high frequency extraction circuit 14 extracts the high frequency component of the luminance signal supplied from the luminance signal source 12, and is not limited to a simple high-pass filter. The variable gain intensifier 15 is such that the increase in gain of the output from the high frequency extraction circuit 14 is controlled by a gain control signal which is an output from a non-linear transmission circuit. The high frequency component of the luminance signal whose gain has been controlled is added to the adder 1 as a correction signal.
6, where it is added to the color difference signal and the luminance signal and used for video display. This adding device 16 is an adding device in a broad sense in the sense of combining images, and is not limited to a mere electronic circuit, but also includes, for example, combining in an electron gun of a picture tube or in the light emission stage. According to this embodiment, the more the narrow color difference signal in the band overlaps with the broadband luminance signal and reduces the resolution of the colored image portion, the larger the correction signal is transmitted to the adding device 16 to improve the resolution.
非直線伝送回路１３に示す特性Ａ及び特性Ｂは次のよう
な特徴をもつ。特性Ａは、ある特定の正入力以下の入力
に対しては出力は零となりそれ以上の入力に対しては比
例的に増大する出力となる。Characteristic A and characteristic B shown in the nonlinear transmission circuit 13 have the following characteristics. Characteristic A is such that the output is zero for inputs below a certain positive input, and increases proportionally for inputs greater than that.
これは飽和度の低い色差信号入力に対しては次段に供給
する利得制御信号は零となり、比較的飽和度の高い色差
信号入力に対してはそれに応じた利得制御信号を出力す
る。特性Ｂは、正入力に対して比例的に出力されるが、
ある特定の正入力以上の入力に対しては出力は一定とな
り負入力に対して出力は零となる。This means that for color difference signal inputs with low saturation, the gain control signal supplied to the next stage is zero, and for color difference signal inputs with relatively high saturation, a corresponding gain control signal is output. Characteristic B is output proportional to positive input, but
For inputs greater than or equal to a certain positive input, the output is constant, and for negative inputs, the output is zero.
これは飽和度の低い色差信号入力に対しては比例的に利
得制御信号が出力されるが、ある一定の飽和度以上にな
ると利得制御信号も一定となる。本実施例では色差入力
のうちＲ−Ｙに対しては特性Ａが、Ｇ−Ｙ及びＢ−Ｙに
対しては特性Ｂが用いられている。これは次の意味で重
要である。一般に肌色に近い色に関しては目は敏感であ
り、本回路方式のような補正信号による色の変化にも同
様である。一方肌色付近の色はＲ−Ｙの飽和度の低い場
合に対応する。そこでＲ−Ｙの飽和度の低い部分に対し
ては補正信号が発生しないように制御する必要がある。
そこで、本実施例ではＲ−Ｙ入力に対して特性Ａのよう
な非線形伝送回路を用いることによってこの目的を達成
している。This means that a gain control signal is output proportionally to a color difference signal input with a low degree of saturation, but when the degree of saturation exceeds a certain level, the gain control signal also becomes constant. In this embodiment, characteristic A is used for R-Y among color difference inputs, and characteristic B is used for G-Y and BY. This is important in the following sense. In general, the eyes are sensitive to colors close to skin color, and the same is true for color changes caused by correction signals such as in this circuit system. On the other hand, colors near skin tone correspond to cases where the saturation level of RY is low. Therefore, it is necessary to perform control so that a correction signal is not generated for the portion where the degree of saturation of R-Y is low.
Therefore, in this embodiment, this objective is achieved by using a nonlinear transmission circuit having characteristic A for the RY input.
一方それ以外の色に対しては飽和度の低い部分から補正
信号を発生するように特性Ｂを用いる。また特性Ｂを用
いることによってＧ−Ｙ及びＢ−Ｙ入力に対し飽和度の
高い部分において補正信号が過大にならないようにして
いる。第３図、第４図に本実施例に基づく各部分の波形
を示す。On the other hand, for other colors, characteristic B is used so that a correction signal is generated from a portion with a low degree of saturation. Further, by using characteristic B, the correction signal is prevented from becoming excessive in the portion where the degree of saturation is high with respect to the G-Y and B-Y inputs. FIGS. 3 and 4 show waveforms of various parts based on this embodiment.
本図においてａは色差信号入力で第３図にＲ−Ｙに関す
る例、第４図Ｇ−Ｙ，Ｂ−Ｙに関する例を示す。ｂは非
直線伝送回路１３を通過した色差信号であり上述の利得
制御信号となる。第３図は特性Ａ、第４図はＢを示す。
ｃは輝度信号、ｄはその高周波信号で高周波抽出回路１
４の出力である。ｅは可変利得増中器１５の出力であり
補正信号となる。ｆは補正信号を元の色差信号に加算し
たものである。このようにして特整Ａをもつ非直線伝送
回路の場合第３図は飽和度の低い色差信号に対して補正
信号は発生しない。以上説明したように、本発明によれ
ば、肌色部分に関しての謀補正を発生することなく着色
部分の解像度を改善することができる。In this figure, a indicates a color difference signal input, and FIG. 3 shows an example related to RY, and FIG. 4 shows an example related to G-Y and BY. b is a color difference signal that has passed through the non-linear transmission circuit 13 and becomes the above-mentioned gain control signal. FIG. 3 shows characteristic A, and FIG. 4 shows characteristic B.
c is a luminance signal, d is its high frequency signal, and the high frequency extraction circuit 1
This is the output of 4. e is the output of the variable gain intensifier 15 and serves as a correction signal. f is the sum of the correction signal and the original color difference signal. In this way, in the case of a non-linear transmission circuit having special adjustment A, no correction signal is generated for a color difference signal with a low degree of saturation as shown in FIG. As described above, according to the present invention, it is possible to improve the resolution of colored portions without making any corrections regarding skin-colored portions.
非直線伝送回路の特性はここに示した例に限定されるこ
となく飽和度の低い色差信号に対して補正信号を発生し
ないものならば何でもよい。The characteristics of the non-linear transmission circuit are not limited to the example shown here, and any characteristics may be used as long as they do not generate correction signals for color difference signals with low saturation.
第１図は従来のカラーテレビジョン受像機を示すブロッ
ク図、第２図は本発明の一実施例におけるカラーテレビ
ジョン受像機の画質改善装置を示すブロック図、第３図
および第４図は本発明の装置における信号処理波形を示
す波形図である。
１・・・・・・映像検波器、２・・・・・・輝度信号増
中器、３……帯城増中器、４，５，６・・・・・・色差
信号復調器、７，８，９・・・・・・加算器、１０・・
・・・・受像管、１１・…・・色差信号源、１２・・・
・・・輝度信号源、１３・・・・・・非直線伝送回路、
１４・・・・・・高周波抽出回路、１５・・・・・・可
変利得増中器、１６・・・・・・加算装置。
第１図第２図
第３図
第４図FIG. 1 is a block diagram showing a conventional color television receiver, FIG. 2 is a block diagram showing an image quality improvement device for a color television receiver according to an embodiment of the present invention, and FIGS. FIG. 3 is a waveform diagram showing signal processing waveforms in the device of the invention. 1... Video detector, 2... Luminance signal intensifier, 3... Obijo intensifier, 4, 5, 6... Color difference signal demodulator, 7 , 8, 9... Adder, 10...
... Picture tube, 11... Color difference signal source, 12...
...Brightness signal source, 13...Nonlinear transmission circuit,
14...High frequency extraction circuit, 15...Variable gain multiplier, 16...Addition device. Figure 1 Figure 2 Figure 3 Figure 4
Claims (1)
入力に対しては出力が零となるような伝送特性を与える
ことにより第１の利得制御信号を作成する第１の非直線
伝送回路と、Ｇ−Ｙ，Ｂ−Ｙ色差信号源に接続され、特
定の正入力以上の入力に対しては出力が一定の正値とな
り、負入力に対しては出力が零となるような伝送特性を
与えることにより第２の利得制御信号を作成する第２の
非直線伝送回路と、輝度信号源に接続され輝度信号の高
周波成分を抽出する高周波抽出回路と、上記第１の非直
線伝送回路と上記高周波抽出回路の出力端子に接続され
上記第１の利得制御信号により輝度信号の高周波成分に
対する利得を制御してＲ−Ｙ用補正信号を作成する第１
の可変利得増幅器と、上記第２の非直線伝送回路と上記
高周波抽出回路の出力端子に接続され上記第２の利得制
御信号により輝度信号の高周波成分に対する利得を制御
してＧ−Ｙ用、Ｂ−Ｙ用補正信号を作成する第２、第３
の可変利得増幅器と、上記各可変利得増幅器、上記色差
信号源および上記輝度信号源に接続され、上記各補正信
号と各色差信号と輝度信号を実質的に加算して映像表示
に供する加算装置を具備したことを特徴とするカラーテ
レビジヨン受像機の画質改善装置。1. A first non-linear transmission that is connected to the R-Y color difference signal source and creates a first gain control signal by giving a transmission characteristic such that the output is zero for inputs below a certain positive input. The transmission is connected to the circuit and the G-Y, B-Y color difference signal source, and the output is a constant positive value for inputs greater than or equal to a specific positive input, and the output is zero for negative inputs. a second non-linear transmission circuit that creates a second gain control signal by giving characteristics; a high-frequency extraction circuit that is connected to the luminance signal source and extracts a high-frequency component of the luminance signal; and the first non-linear transmission circuit. and a first control circuit connected to the output terminal of the high frequency extraction circuit and controlling the gain for the high frequency component of the luminance signal using the first gain control signal to create an R-Y correction signal.
A variable gain amplifier is connected to the output terminals of the second nonlinear transmission circuit and the high frequency extraction circuit, and controls the gain for the high frequency component of the luminance signal by the second gain control signal. -Second and third for creating Y correction signal
a variable gain amplifier, and an adding device connected to each of the variable gain amplifiers, the color difference signal source, and the luminance signal source to substantially add each of the correction signals, each color difference signal, and the luminance signal to provide video display. An image quality improvement device for a color television receiver, characterized by comprising:
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54158546A JPS6033357B2 (en) | 1979-12-06 | 1979-12-06 | Image quality improvement device for color television receivers |
| US06/184,329 US4337479A (en) | 1979-09-13 | 1980-09-05 | Color resolution compensator |
| DE19803034532 DE3034532A1 (en) | 1979-09-13 | 1980-09-12 | COMPENSATION CIRCUIT TO IMPROVE COLOR RESOLUTION |
| FR8019766A FR2465383A1 (en) | 1979-09-13 | 1980-09-12 | COLOR IMAGE RESOLUTION COMPENSATOR FOR COLOR TELEVISION RECEIVER |
| GB8029531A GB2061663B (en) | 1979-09-13 | 1980-09-12 | Colour resolution compensator |
| CA000360171A CA1153463A (en) | 1979-09-13 | 1980-09-12 | Color resolution compensator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54158546A JPS6033357B2 (en) | 1979-12-06 | 1979-12-06 | Image quality improvement device for color television receivers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5680976A JPS5680976A (en) | 1981-07-02 |
| JPS6033357B2 true JPS6033357B2 (en) | 1985-08-02 |
Family
ID=15674062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP54158546A Expired JPS6033357B2 (en) | 1979-09-13 | 1979-12-06 | Image quality improvement device for color television receivers |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6033357B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0392087A (en) * | 1989-09-05 | 1991-04-17 | Konica Corp | Contour emphasis device |
-
1979
- 1979-12-06 JP JP54158546A patent/JPS6033357B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5680976A (en) | 1981-07-02 |
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