JPH06180568A - Image smoothing display system - Google Patents
Image smoothing display systemInfo
- Publication number
- JPH06180568A JPH06180568A JP4334116A JP33411692A JPH06180568A JP H06180568 A JPH06180568 A JP H06180568A JP 4334116 A JP4334116 A JP 4334116A JP 33411692 A JP33411692 A JP 33411692A JP H06180568 A JPH06180568 A JP H06180568A
- Authority
- JP
- Japan
- Prior art keywords
- smoothing
- image
- matrix
- scale factor
- dither image
- 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
- 238000003706 image smoothing Methods 0.000 title claims description 7
- 238000009499 grossing Methods 0.000 claims abstract description 37
- 239000011159 matrix material Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000002093 peripheral effect Effects 0.000 claims abstract description 7
- 230000002542 deteriorative effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
Landscapes
- Image Processing (AREA)
- Facsimile Image Signal Circuits (AREA)
- Controls And Circuits For Display Device (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ディザ画像を拡大縮小
して表示する装置において、画素単位の変化を目立たな
くする平滑処理を行ない、高画質化を計る表示装置にか
かる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for enlarging / reducing a dither image and performing a smoothing process to make a change in pixel units inconspicuous, thereby achieving high image quality.
【０００２】[0002]
【従来の技術】従来の技術は、図３に示す特開平３−１
０５４８４号公報にあるように、拡大処理を行う際に注
目画素に隣接する画素間の重み係数を拡大率に応じて変
化させて平滑化する。2. Description of the Related Art A conventional technique is disclosed in Japanese Patent Laid-Open No. 3-1 shown in FIG.
As described in Japanese Patent No. 05484, when performing enlargement processing, a weighting factor between pixels adjacent to a pixel of interest is changed in accordance with an enlargement ratio and smoothed.
【０００３】しかし、従来の技術では、拡大率が変わっ
ても参照画素の数や参照画素の位置を変化させていなか
った。However, in the conventional technique, the number of reference pixels and the positions of reference pixels are not changed even if the enlargement ratio is changed.
【０００４】[0004]
【発明が解決しようとする課題】ｎ×ｎの領域で濃度を
表すディザ画像をｍ倍に拡大縮小すると、濃度もｍ倍の
領域で表される。そのため、ｎ×ｎの平滑化マトリクス
で平滑化させると、拡大縮小前と比較してｍ倍の領域を
参照して平滑化することになり、濃度の変化や、精細度
の劣化が発生する。When a dither image representing density in an n × n area is scaled up or down by a factor of m, the density is also expressed in a region of m times. Therefore, when smoothing is performed with an n × n smoothing matrix, the area is multiplied by m times as compared with that before the enlargement / reduction, so that the density is changed and the definition is deteriorated.
【０００５】本発明は、上記問題点に対して濃度の変化
を抑え、解像度の劣化を抑えた画像平滑表示方式を提供
することにある。SUMMARY OF THE INVENTION The present invention is directed to an image smoothing display system which suppresses the change in density and the deterioration of resolution in view of the above problems.
【０００６】[0006]
【課題を解決するための手段】本発明は拡大縮小したデ
ィザ画像を格納する画像メモリとディザ画像の拡大縮小
倍率に合わせて、異なる参照画素数の複数の平滑化マト
リクスと拡大縮小倍率から複数の平滑化マトリクスを選
択する手段からなる。According to the present invention, a plurality of smoothing matrices having different numbers of reference pixels and a plurality of scaling factors are used in accordance with an image memory for storing a scaled dither image and a scaling factor of the dither image. It comprises means for selecting a smoothing matrix.
【０００７】[0007]
【作用】前記手段により、画像メモリに格納した拡大縮
小処理を施されたディザ画像に対し、拡大縮小倍率毎に
選択した平滑化マトリクスで平滑化処理を行うことで、
ディザ画像の濃度を変化させず、また解像度を落さずに
平滑表示することができる。With the above-mentioned means, the dither image stored in the image memory and subjected to the scaling process is smoothed by the smoothing matrix selected for each scaling factor.
It is possible to perform smooth display without changing the density of the dither image and without lowering the resolution.
【０００８】[0008]
【実施例】以下、本発明の実施例について説明する。EXAMPLES Examples of the present invention will be described below.
【０００９】図１に本実施例のブロック図を示す。FIG. 1 shows a block diagram of this embodiment.
【００１０】図１において、画像メモリ１１に拡大縮小
されたディザ画像が格納される。In FIG. 1, the scaled dither image is stored in the image memory 11.
【００１１】格納されたディザ画像は図示しない表示装
置の同期信号に同期して読みだされ、平滑化マトリクス
１２、１３、１４で平滑処理が行われる。The stored dither image is read in synchronization with a synchronizing signal of a display device (not shown), and smoothing processing is performed by the smoothing matrices 12, 13 and 14.
【００１２】平滑化処理は、画素単位に注目画素と周辺
画素との局所加算により行われる。The smoothing process is performed by local addition of the target pixel and peripheral pixels in pixel units.
【００１３】平滑化処理が行われたディザ画像は拡大縮
小倍率を選択情報とするセレクタ１５で選択され、図示
しない表示装置で表示される。The smoothed dither image is selected by the selector 15 using the enlargement / reduction ratio as the selection information and displayed on the display device (not shown).
【００１４】次に、セレクタ１５で選択される平滑化マ
トリクスについて説明する。Next, the smoothing matrix selected by the selector 15 will be described.
【００１５】図２に平滑化マトリクスの例を示す。FIG. 2 shows an example of the smoothing matrix.
【００１６】まず、拡大倍縮小倍率が２倍の時は、平滑
化マトリクス２１が選択され、Ｐに注目画素を置き、平
滑化マトリクス２１の形状に合わせて、周辺画素との局
所加算を行う。First, when the enlargement / reduction ratio is 2 times, the smoothing matrix 21 is selected, the pixel of interest is placed in P, and local addition with peripheral pixels is performed according to the shape of the smoothing matrix 21.
【００１７】また、１倍の時は平滑化マトリクス２２、
１／２倍の時は平滑化マトリクス２３が選択され、同様
にＰに注目画素を置き、各平滑化マトリクスの形状に合
わせて周辺画素との局所加算を行う。When it is 1 times, the smoothing matrix 22,
In the case of 1/2, the smoothing matrix 23 is selected, the pixel of interest is similarly placed in P, and local addition with peripheral pixels is performed according to the shape of each smoothing matrix.
【００１８】[0018]
【発明の効果】以上説明したように、拡大縮小したディ
ザ画像を拡大縮小倍率により異なる平滑化マトリクス平
滑化して表示することにより、ディザ画像の濃度の変化
と解像度の低下を防止することができる。As described above, by displaying the enlarged and reduced dither image with the smoothing matrix smoothed depending on the enlargement and reduction ratio, it is possible to prevent changes in the density of the dither image and a decrease in resolution.
【図１】画像平滑表示方式の実施例のブロック図であ
る。FIG. 1 is a block diagram of an embodiment of an image smoothing display method.
【図２】平滑化マトリクスの例を示す図である。FIG. 2 is a diagram showing an example of a smoothing matrix.
【図３】従来の画像平滑化方式を示す図である。FIG. 3 is a diagram showing a conventional image smoothing method.
１１…画像メモリ、 １２、１３、１４…平滑化マトリクス、 １５…セレクタ、 ２１…２倍時の平滑化マトリクス、 ２２…１倍時の平滑化マトリクス、 ２３…１／２倍時の平滑化マトリクス。 11 ... Image memory, 12, 13, 14 ... Smoothing matrix, 15 ... Selector, 21 ... 2 times smoothing matrix, 22 ... 1 times smoothing matrix, 23 ... 1/2 times smoothing matrix .
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０４Ｎ 1/40 １０１ Ｃ 9068−5Ｃ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI Technical indication H04N 1/40 101 C 9068-5C
Claims (2)
中心画素の濃度をｎ×ｎの平滑化マトリクスを用いて、
中心画素と周辺画素から算出し平滑化する表示装置にお
いて、前記ディザ画像の縮小倍率に応じて、平滑化マト
リクスの大きさを変えて局所的な画像を縮小前と同じに
することで、平滑化処理に伴う画像の乱れを抑えること
を特徴とする画像平滑表示方式。1. A dither image stored in a display memory,
Using the n × n smoothing matrix for the density of the central pixel,
In a display device that calculates and smoothes from a central pixel and peripheral pixels, the size of the smoothing matrix is changed according to the reduction ratio of the dither image to make the local image the same as before the reduction, thereby smoothing the image. An image smoothing display method that is characterized by suppressing image distortion due to processing.
縮小倍率ごとに参照画素数を変えた複数の平滑化マトリ
クスを備え、前記ディザ画像の拡大縮小倍率に従い、処
理を行う平滑化マトリクスを切り替えることを特徴とす
る画像平滑表示方式。2. The image smoothing method according to claim 1, further comprising a plurality of smoothing matrices in which the number of reference pixels is changed for each enlargement / reduction ratio, and a smoothing matrix for performing processing in accordance with the enlargement / reduction ratio of the dither image. An image smoothing display method characterized by switching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4334116A JPH06180568A (en) | 1992-12-15 | 1992-12-15 | Image smoothing display system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4334116A JPH06180568A (en) | 1992-12-15 | 1992-12-15 | Image smoothing display system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06180568A true JPH06180568A (en) | 1994-06-28 |
Family
ID=18273706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4334116A Pending JPH06180568A (en) | 1992-12-15 | 1992-12-15 | Image smoothing display system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06180568A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1918874A2 (en) | 2006-10-31 | 2008-05-07 | Seiko Epson Corporation | Filter circuit, image processing circuit, and filtering method |
| US7710604B2 (en) | 2004-03-11 | 2010-05-04 | Infoprint Solutions Company, Llc | Method and system for providing a high quality halftoned image |
| CN115550544A (en) * | 2022-08-19 | 2022-12-30 | 荣耀终端有限公司 | Image processing method and device |
-
1992
- 1992-12-15 JP JP4334116A patent/JPH06180568A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7710604B2 (en) | 2004-03-11 | 2010-05-04 | Infoprint Solutions Company, Llc | Method and system for providing a high quality halftoned image |
| EP1918874A2 (en) | 2006-10-31 | 2008-05-07 | Seiko Epson Corporation | Filter circuit, image processing circuit, and filtering method |
| EP1918874A3 (en) * | 2006-10-31 | 2010-03-10 | Seiko Epson Corporation | Filter circuit, image processing circuit, and filtering method |
| US8155469B2 (en) | 2006-10-31 | 2012-04-10 | Seiko Epson Corporation | Filter circuit, image processing circuit, and filtering method |
| CN115550544A (en) * | 2022-08-19 | 2022-12-30 | 荣耀终端有限公司 | Image processing method and device |
| CN115550544B (en) * | 2022-08-19 | 2024-04-12 | 荣耀终端有限公司 | Image processing method and device |
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