JPH0352068Y2 - - Google Patents
Info
- Publication number
- JPH0352068Y2 JPH0352068Y2 JP1984090285U JP9028584U JPH0352068Y2 JP H0352068 Y2 JPH0352068 Y2 JP H0352068Y2 JP 1984090285 U JP1984090285 U JP 1984090285U JP 9028584 U JP9028584 U JP 9028584U JP H0352068 Y2 JPH0352068 Y2 JP H0352068Y2
- Authority
- JP
- Japan
- Prior art keywords
- addition
- color
- subtraction circuit
- signal
- black
- 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
- 238000003702 image correction Methods 0.000 description 3
- 239000003086 colorant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
Landscapes
- Television Signal Processing For Recording (AREA)
Description
【考案の詳細な説明】
(イ) 産業上の利用分野
本考案はカラー画像を記録する白黒プリンタに
関する。[Detailed description of the invention] (a) Industrial application field The present invention relates to a black and white printer that records color images.
(ロ) 従来技術
テレビ画面に映し出された映像を記録できるビ
デオプリンタが開発されている。カラー画像を白
黒のプリンタで記録する場合、我が国およびアメ
リカで採用されているNTSC方式ではカラーテレ
ビ信号に含まれる輝度信号を用いるので、色相は
異なつても輝度が同じ場合は同一の輝度の画像と
なるため、このような２色が隣接すると輪郭や境
界が不明瞭となりグレーバランスが不自然が画像
になつてしまうという問題がある。(b) Prior Art A video printer that can record images displayed on a television screen has been developed. When recording a color image with a black and white printer, the NTSC system adopted in Japan and the United States uses the luminance signal included in the color television signal, so if the hue is different but the luminance is the same, the image will be of the same luminance. Therefore, when such two colors are adjacent to each other, there is a problem that the outline or boundary becomes unclear and the gray balance becomes unnatural in the image.
(ハ) 考案の目的および構成
本考案は上記の点にかんがみてなされたもの
で、カラー画像を白黒プリンタで記録する際の画
像のコントラストを向上することを目的とし、こ
の目的を達成するために、カラービデオ信号Ｒ，
Ｇ，Ｂの混合比を調整するように構成したもので
ある。(c) Purpose and structure of the invention The present invention was created in view of the above points, and its purpose is to improve the contrast of images when recording color images with black and white printers, and to achieve this purpose. , color video signal R,
It is configured to adjust the mixing ratio of G and B.
(ニ) 実施例 以下図面に基づいて本考案を説明する。(d) Examples The present invention will be explained below based on the drawings.
第１図は本考案による白黒プリンタの一実施例
を示しており、画像補正回路は、赤色加減算回路
１と、緑色加減算回路２と、青色加減算回路３
と、総合加減算回路４とから構成されている。各
加減算回路１，２，３は入力側に赤色信号Ｒ、緑
色信号Ｇ、青色信号Ｂの入力レベルを調整する可
変抵抗R1，R2，R3と、帰還抵抗R4を有する演算
増幅器OP1とにより構成されている。総合加減算
回路４もほぼ同様の構成から成り、入力側に固定
抵抗R5，R6，R7と帰還抵抗付き演算増幅器OP2
とにより構成されている。５は画像補正回路によ
り補正された輝度信号Y′と補正されない輝度信
号Ｙとを切換えるスイツチ、６は輝度信号に基づ
いて映像を映し出すモニターテレビである。 FIG. 1 shows an embodiment of a monochrome printer according to the present invention, and the image correction circuit includes a red addition/subtraction circuit 1, a green addition/subtraction circuit 2, and a blue addition/subtraction circuit 3.
and a general addition/subtraction circuit 4. Each of the adder/subtractor circuits 1, 2, and 3 is an operational amplifier OP having variable resistors R 1 , R 2 , R 3 for adjusting the input levels of the red signal R, green signal G, and blue signal B, and a feedback resistor R 4 on the input side. 1 . The general adder/subtractor circuit 4 has almost the same configuration, with fixed resistors R 5 , R 6 , R 7 and an operational amplifier OP 2 with a feedback resistor on the input side.
It is composed of. 5 is a switch for switching between the brightness signal Y' corrected by the image correction circuit and the uncorrected brightness signal Y; and 6 is a monitor television that displays images based on the brightness signal.
NTSC方式のカラーテレビ信号においては、色
信号Ｒ，Ｇ，Ｂと輝度信号Ｙとの間にはＹ＝
0.3R＋0.59G＋0.11Bの関係があり、このような
カラーテレビ信号が画像補正回路に入力される。
いまカラー画像を白黒プリンタで記録する場合、
スイツチ５を接点ａに切換えて補正しない輝度信
号Ｙによる白黒画像をモニタテレビ６に映し出
す。その結果モニターテレビ６の画面に映し出さ
れた白黒画像の中に色相が異なるにもかかわらず
輝度が同じか近似しているために輪郭または境界
が明瞭でない部分が認められたときは、加減算回
路１，２，３の可変抵抗器R1，R2，R3のいずれ
かを調整することにより赤色信号Ｒ、緑色信号
Ｇ、青色信号Ｂのレベルを変えることによりＲ，
Ｇ，Ｂの混合比を変える。各加減算回路１，２，
３によりＲ，Ｇ，Ｂの混合比が調整された後総合
加減算回路４で混合されて補正輝度信号Y′が得
られる。このときスイツチ５を接点ｂに切り換え
ておくと、モニターテレビ６に補正輝度信号
Y′に基づく映像が映し出されるので、この映像
を見ながら画像の輪郭や境界が明瞭になるまで調
整する。 In the NTSC color television signal, there is a difference between the color signals R, G, B and the luminance signal Y.
There is a relationship of 0.3R + 0.59G + 0.11B, and such a color television signal is input to the image correction circuit.
When printing a color image using a black and white printer,
The switch 5 is switched to the contact point a, and a black and white image based on the uncorrected luminance signal Y is displayed on the monitor television 6. As a result, if there is a part in the black and white image displayed on the screen of the monitor television 6 where the brightness is the same or similar even though the hue is different and the outline or boundary is not clear, the adding/subtracting circuit 1 , 2 and 3 by adjusting the levels of the red signal R, green signal G, and blue signal B by adjusting any of the variable resistors R 1 , R 2 , and R 3 .
Change the mixing ratio of G and B. Each addition/subtraction circuit 1, 2,
After the mixing ratio of R, G, and B is adjusted in step 3, the signals are mixed in a comprehensive addition/subtraction circuit 4 to obtain a corrected luminance signal Y'. At this time, if the switch 5 is set to contact b, the corrected brightness signal will be sent to the monitor TV 6.
An image based on Y' will be displayed, so adjust while watching this image until the outline and boundaries of the image are clear.
こうして得られた補正輝度信号Y′を図示しな
い白黒プリンタに送信すれば、輝度が同じでも色
相が異なる画像は異なるコントラストで記録され
る。 If the corrected brightness signal Y' thus obtained is sent to a monochrome printer (not shown), images having the same brightness but different hues will be recorded with different contrasts.
上記実施例はカラーテレビジヨンの映像を白黒
プリンタでプリントする場合について例示した
が、本考案はビデオカメラから出力するカラービ
デオ信号の場合も同様に適用することができる。 Although the above embodiment has been exemplified in the case where color television images are printed by a monochrome printer, the present invention can be similarly applied to the case of color video signals output from a video camera.
なお、白黒プリンタとしては、レーザビームプ
リンタ、オプチカルフアイバー管（OFT）を用
いたプリンタなど種々の型式のものについて可能
である。 Note that various types of black and white printers are possible, such as a laser beam printer and a printer using an optical fiber tube (OFT).
(ホ) 考案の効果
以上説明したように、本考案においては、カラ
ー画像を記録する白黒プリンタにおいて、カラー
ビデオ信号の色信号Ｒ，Ｇ，Ｂの混合比を特定色
の組合せに対して白黒画像においてコントラスト
が出るように調整する補正回路を設けたので、カ
ラー画像を白黒プリンタで記録したときに同じ輝
度を有する特定色の組合せに対してコントラスト
が大きくでき輪郭や境界が明瞭な白黒画像が得ら
れる。(e) Effects of the invention As explained above, in the invention, in a monochrome printer that records color images, the mixing ratio of the color signals R, G, and B of the color video signal can be adjusted to create a monochrome image for a specific color combination. We have installed a correction circuit that adjusts the contrast so that when a color image is recorded on a black and white printer, the contrast can be increased for specific color combinations with the same brightness, resulting in a black and white image with clear outlines and boundaries. It will be done.
第１図は本考案による白黒プリンタの一実施例
である。
１……赤色加減算回路、２……緑色加減算回
路、３……青色加減算回路、４……総合加減算回
路、５……切換スイツチ、６……モニターテレ
ビ。
FIG. 1 shows an embodiment of a black and white printer according to the present invention. 1... Red addition/subtraction circuit, 2... Green addition/subtraction circuit, 3... Blue addition/subtraction circuit, 4... Comprehensive addition/subtraction circuit, 5... Changeover switch, 6... Monitor TV.
Claims (1)
を色ごとに可変調整する赤色加減算回路、緑色加
減算回路、青色加減算回路と、前記各色加減算回
路の出力を加減算して可変調整する総合加減算回
路と、前記総合加減算回路から出力される補正さ
れた輝度信号とカラービデオ信号の輝度信号とを
切換える切換手段と、該切換手段を介して出力さ
れる輝度信号に基づいて映像を映し出すモニタテ
レビとを有することを特徴とする白黒プリンタ。 A red addition/subtraction circuit, a green addition/subtraction circuit, and a blue addition/subtraction circuit that variably adjust the mixing ratio of color signals R, G, and B of a color video signal for each color, and a comprehensive addition/subtraction circuit that variably adjusts the outputs of the color addition/subtraction circuits by adding and subtracting the outputs. and a switching means for switching between the corrected luminance signal output from the general addition/subtraction circuit and the luminance signal of the color video signal, and a monitor television that displays an image based on the luminance signal outputted via the switching means. A black and white printer characterized by having:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9028584U JPS617181U (en) | 1984-06-19 | 1984-06-19 | black and white printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9028584U JPS617181U (en) | 1984-06-19 | 1984-06-19 | black and white printer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS617181U JPS617181U (en) | 1986-01-17 |
| JPH0352068Y2 true JPH0352068Y2 (en) | 1991-11-11 |
Family
ID=30645140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9028584U Granted JPS617181U (en) | 1984-06-19 | 1984-06-19 | black and white printer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS617181U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5851684A (en) * | 1981-09-22 | 1983-03-26 | Fujitsu Ltd | Video signal synthesizing system |
-
1984
- 1984-06-19 JP JP9028584U patent/JPS617181U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5851684A (en) * | 1981-09-22 | 1983-03-26 | Fujitsu Ltd | Video signal synthesizing system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS617181U (en) | 1986-01-17 |
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