JPS61248166A - Jaggy removing device - Google Patents

Jaggy removing device

Info

Publication number
JPS61248166A
JPS61248166A JP60089245A JP8924585A JPS61248166A JP S61248166 A JPS61248166 A JP S61248166A JP 60089245 A JP60089245 A JP 60089245A JP 8924585 A JP8924585 A JP 8924585A JP S61248166 A JPS61248166 A JP S61248166A
Authority
JP
Japan
Prior art keywords
output
input
dimensional filter
jaggy
converting device
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
Application number
JP60089245A
Other languages
Japanese (ja)
Inventor
Yoshiyuki Miyabe
義幸 宮部
Mikito Ishikawa
石川 幹人
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP60089245A priority Critical patent/JPS61248166A/en
Publication of JPS61248166A publication Critical patent/JPS61248166A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To decrease the memory capacity and to shorten the operating time by providing a non-linear processing means to correct the gamma characteristic of the cathode ray tube. CONSTITUTION:The output of a binary picture memory 1 is inputted to a two-dimensional filter 2 and the output of the level of 17 stages is inputted to a non- linear converting device 3 by the two-dimensional filter. The non-linear converting device 3 is composed of the circuit to make the picture quantized by the quantizer of 256 levels again into the output after the output is converted by the converting device having the input output characteristics shown in the figure. Thus, by a small number of the quantized levels, the picture can be effectively displayed, the operating time of the jaggy removing device can be shortened and the memory capacity can be reduced.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、画像生成装置、画像処理装置、画像表示装置
等に用いることができるジャギー除去装置に関するもの
である。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a jaggie removal device that can be used in image generation devices, image processing devices, image display devices, and the like.

従来の技術 人工的に造シ出された2値画像は、一般に無限大の空間
周波数帯域を有しており、上記画像を有限数の画素で表
示する場合、図形の境界部に階段状の折り返し雑音(以
下ジャギーと呼ぶ。)が発出ナス−?−めrら外、・ン
、l−の鈴よ汁猪々の両倫関連装置において、必要不可
欠なものとなってきている。
Conventional technology Artificially created binary images generally have an infinite spatial frequency band, and when displaying the above image with a finite number of pixels, there is a step-like folding at the boundary of the figure. Does noise (hereinafter referred to as jaggy) occur? It has become an indispensable part of the Ryorin-related equipment of Suzuyojiru Inani in -Meraragai,...n,l-.

次に従来のジャギー除去装置について述べる〇ジャギー
を除去するには、解像度のより高い画像の複数個の画素
を平均して、目的とする解像度の一画素を決定する方式
等が知られている。mこの方式を ディジタルシステムで実現すると、第4図に示すように
、高解像度の画像メモリとその出力を入力とする2次元
フィルタによって構成される。
Next, a conventional jaggie removal device will be described. In order to remove jaggies, a method is known in which a plurality of pixels of a higher resolution image are averaged to determine one pixel of the target resolution. When this method is implemented in a digital system, as shown in FIG. 4, it is composed of a high-resolution image memory and a two-dimensional filter that receives its output as input.

発明が解決しようとする問題点 ジャギー除去を完全に行うためには、ジャギー除去装置
の出力が、一般のディジタル画像で必要とされている1
画素あたシ8ビットという階調(266階調)の範囲を
十分にとる必要がある。
Problems to be Solved by the Invention In order to completely remove jaggies, the output of the jaggies removal device must be 1, which is required for general digital images.
It is necessary to have a sufficient range of gradations (266 gradations) with 8 bits per pixel.

このためには、表示画素数の数十倍の画素データを記憶
することのできる画像メモリを必要とし。
For this purpose, an image memory capable of storing pixel data several tens of times the number of display pixels is required.

そのメモリの出力に対し、7X7程度のサイズの2次元
フィルタ処理を行う必要がある。このような装置は、画
像メモリの大きさや、フィルタの動作詩間の点で問題が
ある。このため、数倍の画素データを記憶した画像メモ
リから2値の画像信号を読み出し、この信号を3×3程
度のサイズの2次元フィルタ処理を行うことによりジャ
ギー除去がなされているが、これによって十分な効果を
得ることはできない。
It is necessary to perform two-dimensional filter processing with a size of about 7×7 on the output of the memory. Such devices have problems in terms of image memory size and filter performance. For this reason, jaggies are removed by reading out a binary image signal from an image memory that stores several times as much pixel data and subjecting this signal to two-dimensional filter processing with a size of about 3 x 3. You can't get the full effect.

本発明は、必要とするメモリ容量を縮少し、かつ動作時
間を短縮化することを可能とするジャギー除去装置を提
供することを目的としている。
SUMMARY OF THE INVENTION An object of the present invention is to provide a jaggie removal device that can reduce the required memory capacity and shorten the operating time.

問題点を解決するための手段 本発明のジャギー除去装置は、ブラウン管のガンマ特性
を補正するような非線形処理手段を設けたものである。
Means for Solving the Problems The jaggie removal device of the present invention is provided with nonlinear processing means for correcting the gamma characteristics of a cathode ray tube.

作  用 上記した構成により、少なメメモリ容量及び短かい動作
時間でジャギーを首尾よく除去することができる〇 実施例 以下、本発明の実施例について図面を参照しながら説明
する。
Operation With the above-described configuration, jaggies can be successfully removed with a small memory capacity and a short operation time.Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

第1図は本発明の一実施例に係るジャギー除去装置のブ
ロック図を示すものである。第1図において、1は画像
メモリ、2は帯域制限のための3×3程度の2次元フィ
ルタ、3は非線形変換器である。
FIG. 1 shows a block diagram of a jaggy removing device according to an embodiment of the present invention. In FIG. 1, 1 is an image memory, 2 is a two-dimensional filter of about 3×3 for band limitation, and 3 is a nonlinear converter.

以下、本発明の一実施例の動作について説明する。2値
の画像メモリ1の出力は第2図に示すような特性を有す
る2次元フィルタ2に入力される〇この2次元フィルタ
は17段階′のレベルの出力を有しこの出力は非線形変
換器3に入力される。
The operation of one embodiment of the present invention will be described below. The output of the binary image memory 1 is input to a two-dimensional filter 2 having characteristics as shown in FIG. is input.

ブラウン管の入力信号に対する出力の関係は、第3図に
示すようなガンマ特性に従うことが知られている。通常
、ブラウン管の入力は、この特性を補正する形で行われ
ておシ、ジャギー除去装置の入出力も、このようなガン
マ補正された信号である必要がある。非線形変換器3は
、2次元フィルタ4の17レベルの出力を入力として、
第3図に示すような入出力特性を有する変換器で変換後
、改めて256レベルの量子化器で量子化されたものを
出力とする回路で構成される。この非線形変換器3は、
本実施例の入出力の場合、あらかじめ5ビツトの入力に
対し、8ピントの出力を記憶させたROMテーブルによ
っても実現することができる。
It is known that the relationship between the input signal and the output of a cathode ray tube follows gamma characteristics as shown in FIG. Normally, the input to the cathode ray tube is corrected for this characteristic, and the input and output of the jaggie removal device also needs to be such a gamma-corrected signal. The nonlinear converter 3 receives the 17-level output of the two-dimensional filter 4 as input,
It is composed of a circuit that outputs the result of conversion by a converter having input/output characteristics as shown in FIG. 3, and then quantized by a 256-level quantizer. This nonlinear converter 3 is
The input/output of this embodiment can also be realized by a ROM table in which 8-pin outputs are stored in advance for 5-bit inputs.

発明の効果 以上の説明から明らかなように、本発明はブラウン管の
ガンマ特性を補正するように非線形処理された出力が得
られるように構成されたものであシ、このことにより、
少ない量子化レベル数で有効に画像を表すことができ、
その結果により、ジャギー除去装置の動作時間を短縮し
、かつメモリ容量を縮少することができるという効果が
得られる0
Effects of the Invention As is clear from the above explanation, the present invention is configured to obtain an output that has been nonlinearly processed to correct the gamma characteristics of the cathode ray tube.
Images can be effectively represented with a small number of quantization levels,
As a result, it is possible to shorten the operating time of the jaggy removal device and reduce the memory capacity.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例によるジャギル除去装置のブ
ロック図、第2図は上記実施例で用いられる2次元フィ
ルタの特性を示す図、第3図は変換器の入出力特性を示
す図、第4図は従来例のブロック図、第5図はブラウン
管の入出力特性を示す図である。 1・・・・・・画像メモリ、2・・・・・・2次元フィ
ルタ、3・・・・・・非線形変換器、4・・・・・・画
像メモリ、5・・・・・・2次元フィルタ。 代理人の氏名 弁理士 中 尾 敏 男 ほか1名萄只
鹸田 区 aコ
Fig. 1 is a block diagram of a jagir removal device according to an embodiment of the present invention, Fig. 2 is a diagram showing the characteristics of a two-dimensional filter used in the above embodiment, and Fig. 3 is a diagram showing the input/output characteristics of the converter. , FIG. 4 is a block diagram of a conventional example, and FIG. 5 is a diagram showing input/output characteristics of a cathode ray tube. 1...Image memory, 2...Two-dimensional filter, 3...Nonlinear converter, 4...Image memory, 5...2 Dimensional filter. Name of agent: Patent attorney Toshio Nakao and 1 other person Kenda-ku A-co

Claims (1)

【特許請求の範囲】[Claims] 2値画像メモリと、前記2値画像メモリの出力を入力と
する2次元ディジタルフィルタと、前記2次元フィルタ
の出力を入力とし、前記入力に対しガンマ補正処理を施
したディジタル信号を出力する非線形変換器とを具備し
たジャギー除去装置。
a binary image memory, a two-dimensional digital filter that receives the output of the binary image memory as an input, and a nonlinear transformation that receives the output of the two-dimensional filter as an input and outputs a digital signal obtained by performing gamma correction processing on the input. A jaggery removal device equipped with a container.
JP60089245A 1985-04-25 1985-04-25 Jaggy removing device Pending JPS61248166A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60089245A JPS61248166A (en) 1985-04-25 1985-04-25 Jaggy removing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60089245A JPS61248166A (en) 1985-04-25 1985-04-25 Jaggy removing device

Publications (1)

Publication Number Publication Date
JPS61248166A true JPS61248166A (en) 1986-11-05

Family

ID=13965364

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60089245A Pending JPS61248166A (en) 1985-04-25 1985-04-25 Jaggy removing device

Country Status (1)

Country Link
JP (1) JPS61248166A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63184880A (en) * 1987-01-28 1988-07-30 Fuji Electric Co Ltd Picture density converter
JPH05174143A (en) * 1991-06-10 1993-07-13 General Electric Co <Ge> Space filter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5651158A (en) * 1979-10-03 1981-05-08 Ricoh Co Ltd Reproducing method of binary picture
JPS5688138A (en) * 1979-12-21 1981-07-17 Dainippon Screen Mfg Co Ltd Forming method of memory table
JPS5854486A (en) * 1981-09-28 1983-03-31 Fujitsu Ltd Image displaying system having variable density processing function
JPS5863989A (en) * 1981-10-13 1983-04-16 大日本スクリ−ン製造株式会社 Contrast correction of output data for digital image processor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5651158A (en) * 1979-10-03 1981-05-08 Ricoh Co Ltd Reproducing method of binary picture
JPS5688138A (en) * 1979-12-21 1981-07-17 Dainippon Screen Mfg Co Ltd Forming method of memory table
JPS5854486A (en) * 1981-09-28 1983-03-31 Fujitsu Ltd Image displaying system having variable density processing function
JPS5863989A (en) * 1981-10-13 1983-04-16 大日本スクリ−ン製造株式会社 Contrast correction of output data for digital image processor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63184880A (en) * 1987-01-28 1988-07-30 Fuji Electric Co Ltd Picture density converter
JPH05174143A (en) * 1991-06-10 1993-07-13 General Electric Co <Ge> Space filter
US5347590A (en) * 1991-06-10 1994-09-13 General Electric Company Spatial filter for an image processing system

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