JPH04126282A - Misregistration evaluation method - Google Patents

Misregistration evaluation method

Info

Publication number
JPH04126282A
JPH04126282A JP2246108A JP24610890A JPH04126282A JP H04126282 A JPH04126282 A JP H04126282A JP 2246108 A JP2246108 A JP 2246108A JP 24610890 A JP24610890 A JP 24610890A JP H04126282 A JPH04126282 A JP H04126282A
Authority
JP
Japan
Prior art keywords
evaluation
pattern
color printing
evaluation pattern
patterns
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
JP2246108A
Other languages
Japanese (ja)
Inventor
Seikichi Nakamura
盛吉 中村
Toshio Ebinaka
胡中 俊雄
Kazuhiko Sato
一彦 佐藤
Jun Moroo
潤 師尾
Tomohisa Mikami
三上 知久
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP2246108A priority Critical patent/JPH04126282A/en
Publication of JPH04126282A publication Critical patent/JPH04126282A/en
Pending legal-status Critical Current

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  • Accessory Devices And Overall Control Thereof (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Color, Gradation (AREA)
  • Color Image Communication Systems (AREA)

Abstract

PURPOSE:To improve a registration accuracy by a method wherein color printing is conducted after a plurality of evaluation patterns are sequentially read, and after a required evaluation pattern is selected, a misregistration amount among three primary colors is determined on the basis of characteristics coincident with the required evaluation pattern by referring to evaluation information. CONSTITUTION:A printer is provided with a first memory means A storing image data to be printed, a second memory means B storing a plurality of evaluation patterns differing in combination of a line width, a line color, and a background color surrounding the line and evaluation information representing a relation between a subjective evaluation value and a misregistration, and a selection means C switching the first memory means A and the second memory means B. Color printing is conducted after said two or more evaluation patterns are sequentiallty read. After a required evaluation pattern is selected, a misregistration amount among three primary colors is determined on the basis of characteristics coincident with said required evaluation pattern by referring to said evaluation information. For example, the second memory means B is a read only memory (ROM), the selection means C is a multiplexer, and the evaluation patterns are composed of a most strict evaluation pattern, a relatively strict evaluation pattern, and an average evaluation pattern.

Description

【発明の詳細な説明】 〔概 要〕 カラー印刷の位置ずれ評価方式に関し、カラー印刷にお
いて機構部品の劣化や汚れによる装置の経時変化に起因
する位置ずれを、修正するときに位置合わせ精度の確認
を容易に行うことを目的とし、 3原色のうち少なくとも2色以上の重ね合わせによるカ
ラー印刷の位置ずれ評価方式であって、印刷すべき画像
データを格納する第1の記憶手段と、線幅と一色と線周
囲の背景色との組合せを変えた複数の評価パターン、及
び主観評価値と位置ずれの関係を示す評価情報を格納す
る第2の記憶手段と、該第1の記憶手段と第2の記憶手
段を切り換える選択手段とを備え、カラー印刷の開始前
に該複数の評価パターンを順次読み出してカラー印刷を
行い、所定の評価パターンを選択した後、該評価情報を
参照して該所定の評価パターンに合致した特性に基づき
3原色の位置ずれ量を決定するように構成する。
[Detailed Description of the Invention] [Summary] Concerning a method for evaluating positional misalignment in color printing, this method is used to check alignment accuracy when correcting misalignment caused by aging of the device due to deterioration or dirt in mechanical parts during color printing. This is a positional deviation evaluation method for color printing by superimposing at least two of the three primary colors, and includes a first storage means for storing image data to be printed, a line width and a line width. a second storage means for storing a plurality of evaluation patterns with different combinations of one color and a background color around the line, and evaluation information indicating a relationship between a subjective evaluation value and a positional deviation; and a selection means for switching the storage means, and before starting color printing, the plurality of evaluation patterns are sequentially read out to perform color printing, and after selecting a predetermined evaluation pattern, referring to the evaluation information and selecting the predetermined evaluation pattern. The configuration is such that the amount of positional shift of the three primary colors is determined based on the characteristics that match the evaluation pattern.

(産業上の利用分野〕 本発明はカラー印刷装置に関し、特に、位置合わせ精度
を確認するための評価パターンを格納する記憶手段を備
え、この記憶手段を参照してカラー印刷における3原色
の位置ずれ評価を行う位置ずれ評価方式に関する。
(Industrial Application Field) The present invention relates to a color printing apparatus, and in particular, the present invention is provided with a storage means for storing an evaluation pattern for checking alignment accuracy, and the storage means is referred to to determine the positional deviation of three primary colors in color printing. This invention relates to a positional deviation evaluation method for performing evaluation.

〔従来の技術と発明が解決しようとする課題〕カラー印
刷装置ではイエロー、マゼンタ、シアンの印刷上の3原
色を重ね合わせて種々の色を再現する。この場合、重ね
合わせの精度が十分でないと、各色の位置ずれにより本
来見えないはずの色が見えてしまうことになる。例えば
、青画像の場合に位置ずれによってマゼンタとシアンが
緑に現れる。従って、カラー印刷装置では、従来、位置
合わせ精度の向上のために種々の手段を講じている。
[Prior Art and Problems to be Solved by the Invention] In a color printing device, various colors are reproduced by superimposing the three printing primary colors of yellow, magenta, and cyan. In this case, if the overlay accuracy is not sufficient, colors that should not be visible will become visible due to positional deviations of each color. For example, in the case of a blue image, magenta and cyan appear as green due to positional shift. Therefore, color printing apparatuses have conventionally taken various measures to improve alignment accuracy.

代表的な方法として、記録紙の4隅に設けられた細い十
字マーク(レジスタマーク、いわゆるトンボ)を確認し
て3原色の重ね合わせの位置ずれ精度を確認している。
A typical method is to check thin cross marks (register marks, so-called register marks) provided at the four corners of the recording paper to check the positional deviation accuracy of the superposition of the three primary colors.

即ち、各色印刷毎に設けられた[トンボJを重ね合わせ
て位置ずれを補正する。しかし、実際の位置ずれは線の
太さや角度により見え方が著しく変わってくるため、こ
の「トンボ」による方法は必ずしも最適な方法ではない
That is, the registration marks J provided for each color printing are superimposed to correct the positional deviation. However, since the appearance of actual positional deviation changes significantly depending on the thickness and angle of the line, this method using "region marks" is not necessarily the optimal method.

一方、従来、人間の視覚上どの程度の位置ずれならば許
容されるかという主観評価値と、その主観評価値の根拠
が明確でなかったため、メーカー側では不必要に位置合
わせ精度の向上を図る傾向にあった。例えば、人間の視
覚上の色位置ずれ検知限界は、一般に50μmであると
言われている。
On the other hand, in the past, the subjective evaluation value of how much positional deviation is permissible based on human vision and the basis for that subjective evaluation value were not clear, so manufacturers were forced to unnecessarily try to improve alignment accuracy. It was a trend. For example, it is said that the human visual sense limit for color position shift detection is generally 50 μm.

従って、この検知限界以上に過度の位置ずれ精度を求め
ても無駄であり、結果的にカラー印刷のコストアンプを
来すことになる。
Therefore, it is wasteful to seek excessive positional deviation accuracy beyond this detection limit, which results in an increase in the cost of color printing.

本発明の目的は、放射状の線でかつ、線幅、線の色、線
周辺の背景色を種々組み合わせた評価パターンを格納す
る記憶手段を設け、これから読み出した結果と、主観評
価値と位置ずれ量の関係を示す評価情報に基づいて、位
置ずれ量を得て位置合わせ精度の向上を図ることにある
An object of the present invention is to provide a storage means for storing evaluation patterns of radial lines and various combinations of line widths, line colors, and background colors around the lines, and to store results read from the evaluation patterns, subjective evaluation values, and positional deviations. The object of this invention is to obtain the amount of positional deviation based on evaluation information indicating the relationship between the amounts and to improve the alignment accuracy.

[課題を解決するための手段] 第1図は本発明の原理構成図である。[Means to solve the problem] FIG. 1 is a diagram showing the basic configuration of the present invention.

本発明は、3原色のうち少なくとも2色以上の重ね合わ
せによるカラー印刷の位置ずれ評価方式であって、印刷
すべき画像データを格納する第1の記憶手段Aと、線幅
と線色と線周囲の背景色との組合せを変えた複数の評価
パターン、及び主観評価値と位置ずれの関係を示す評価
情報を格納する第2の記憶手段Bと、該第1の記憶手段
Aと第2の記憶手段Bを切り換える選択手段Cとを備え
、カラー印刷の開始前に該複数の評価パターンを順次読
み出してカラー印刷を行い、所定の評価パターンを選択
した後、該評価情報を参照して該所定の評価パターンに
合致した特性に基づき3原色の位置ずれ量を決定するよ
うにしたとを特徴とする。
The present invention is a positional deviation evaluation method for color printing by superimposing at least two of three primary colors, and includes a first storage means A for storing image data to be printed, a line width, a line color, and a line width. a second storage means B for storing a plurality of evaluation patterns in different combinations with surrounding background colors and evaluation information indicating the relationship between subjective evaluation values and positional deviation; and a selection means C for switching the storage means B, and before starting color printing, the plurality of evaluation patterns are sequentially read out to perform color printing, and after selecting a predetermined evaluation pattern, referring to the evaluation information and selecting the predetermined evaluation pattern. The present invention is characterized in that the amount of positional deviation of the three primary colors is determined based on the characteristics that match the evaluation pattern.

実施例として、第2の記憶手段Bは読出し専用メモリ(
ROM)であり、選択手段Cはマルチプレクサであり、
評価パターンは最も厳しい評価となるパターンと比較的
厳しい評価となるパターンと平均的な評価となるパター
ンにより構成される。
As an example, the second storage means B may be a read-only memory (
ROM), the selection means C is a multiplexer,
The evaluation pattern is composed of a pattern that gives the most severe evaluation, a pattern that gives a relatively severe evaluation, and a pattern that gives an average evaluation.

さらに、実施例として評価パターンの線幅は10ポイン
ト以下であり、評価パターンは放射状に形成される。
Furthermore, as an example, the line width of the evaluation pattern is 10 points or less, and the evaluation pattern is formed radially.

〔作 用] 本発明では人間による主観評価値と位置ずれの関係を示
す評価グラフを所定の評価パターンを用いて予め実験的
に求めておき、これを記憶手段に格納し、実際のカラー
印刷前にこの評価パターンで印刷し、記憶された評価情
報を参照して、位置ずれ量を決定する。実際の視覚上の
位置ずれと非常に近いデータを得ることができる。
[Function] In the present invention, an evaluation graph showing the relationship between human subjective evaluation values and positional deviation is experimentally obtained in advance using a predetermined evaluation pattern, and is stored in a storage means before actual color printing. This evaluation pattern is printed on the computer, and the amount of positional deviation is determined by referring to the stored evaluation information. It is possible to obtain data that is very close to the actual visual positional deviation.

〔実施例〕〔Example〕

第3図は第2の記憶手段に格納される本発明の評価パタ
ーンであり、放射状の線でかつ、線幅、線色、線周辺の
背景色を種々組み合わせて作られる。この場合、評価パ
ターンの線幅は1ポイント(1/72@’)である。但
し、10ポイント以下である必要がある。第4図に示す
ように、この線幅ならば主観評価値と視覚上の位置ずれ
量の対応が比較的正確に得られるからである。
FIG. 3 shows an evaluation pattern of the present invention stored in the second storage means, which is made of radial lines and is created by combining various line widths, line colors, and background colors around the lines. In this case, the line width of the evaluation pattern is 1 point (1/72@'). However, it must be 10 points or less. This is because, as shown in FIG. 4, with this line width, the correspondence between the subjective evaluation value and the visual positional deviation amount can be obtained relatively accurately.

本発明の実施例の評価パターンは、最も厳しい評価とな
るパターンと、比較的厳しい評価となるパターンと、平
均的な評価となるパターンにより構成され、 最も厳しい評価となるパターンの色の組合せは、線色が
青で背景が黒であり、 比較的厳しい評価となるパターンの色の組合せは、線色
が緑で背景がマゼンタ若しくは線色が赤で背景がシアン
であり、 平均的な評価となるパターンの色の組合せは、線色が赤
若しくは緑で背景が白色である。
The evaluation pattern of the embodiment of the present invention is composed of a pattern that gives the most severe evaluation, a pattern that gives a relatively severe evaluation, and a pattern that gives an average evaluation.The color combination of the pattern that gives the most severe evaluation is as follows: Pattern color combinations in which the line color is blue and the background is black, which results in a relatively severe evaluation, are those in which the line color is green and the background is magenta, or the line color is red and the background is cyan, which results in an average evaluation. The color combination of the pattern is that the line color is red or green and the background is white.

第4図は第3図の評価パターンを用いて作成した主観評
価量と位置ずれ量との関係を示す評価グラフである。縦
軸は主観評価値であり横軸は位置ずれ量である。
FIG. 4 is an evaluation graph showing the relationship between the subjective evaluation amount and the positional deviation amount created using the evaluation pattern shown in FIG. The vertical axis is the subjective evaluation value, and the horizontal axis is the amount of positional deviation.

主観評価値と視覚的な悪貨との対応は、評価値1〜2は
視覚上非常に品質の悪い受信限界であり、2〜3は視覚
上一応耐えられる我慢限界であり、3〜4は視覚上許容
できる許容限界であり、4〜5は視覚上良好な検知限界
である。
The correspondence between subjective evaluation values and visual bad money is that evaluation values 1 to 2 are the reception limit with extremely poor visual quality, 2 to 3 are the tolerable limit for the visual quality, and 3 to 4 are the reception limit that can be tolerated visually. 4 to 5 is a visually good detection limit.

このグラフは前述のように第3図に示す複数の評価パタ
ーンを用いて、複数の人間により評価実験を行って求め
たものであるが、図示のように、線色が赤で背景色が白
、線色が赤で背景がシアン、等の組合せにより、位置ず
れ量の変化と共に主観評価値が著しく変わることが判る
As mentioned above, this graph was obtained through evaluation experiments conducted by multiple people using multiple evaluation patterns shown in Figure 3.As shown in the figure, the line color is red and the background color is white. , it can be seen that the subjective evaluation value changes significantly with the change in the amount of positional deviation, depending on the combination of red line color and cyan background.

線幅を例えば1ポイントとした場合に、位置ずれが少な
い(θ〜1100aの範囲)にもかかわらず、最も厳し
い評価は青と黒の隣接であり、青と黒を識別できる我慢
限界ということができる。比較的評価の厳しいのは緑と
マゼンタの隣接である。
For example, when the line width is set to 1 point, the most severe evaluation is the adjacency of blue and black, even though the positional deviation is small (in the range of θ ~ 1100a), which means that the tolerance limit for distinguishing between blue and black is can. It is relatively difficult to evaluate the adjacency of green and magenta.

そして、平均的に評価が高いのは背景が白のときである
。即ち、線色が赤で背景が白、又は線色が緑で背景が白
のときは位置ずれが多少あっても評価は高い。
On average, the evaluation is high when the background is white. That is, when the line color is red and the background is white, or when the line color is green and the background is white, the evaluation is high even if there is some positional shift.

従って、上記の評価グラフから言えることは目的や用途
によってこの評価パターンを使い分ければ位置ずれの量
がわかるばかりか、人間が感じる主観的な評価量も同時
に判ることになる。
Therefore, what can be said from the above evaluation graph is that by using these evaluation patterns depending on the purpose and application, not only the amount of positional deviation can be determined, but also the subjective evaluation amount felt by humans.

第2図は本発明の一実施例ブロック構成図である0図中
、1はホストコンピュータと接続されるデータ入力イン
タフェース、2はページメモリ、3は評価パターン格納
メモリ(ROM) 、4はMPUからの指示のもとに入
力データのページメモリ2に書き込む書込み制御手段、
5はMPUの指示のもとにページメモリ2″からの読み
出し、若しくは評価パターン格納メモリ3からの読み出
しを行う読出し制御手段、6はMPUからの制御信号S
によってページメモリ2と評価パターン格納メモリ3の
切り換えを行うマルチプレクサである。
Figure 2 is a block configuration diagram of an embodiment of the present invention. In Figure 0, 1 is a data input interface connected to a host computer, 2 is a page memory, 3 is an evaluation pattern storage memory (ROM), and 4 is a data input interface from the MPU. write control means for writing input data into the page memory 2 under the instruction of;
5 is a read control means for reading from the page memory 2'' or reading from the evaluation pattern storage memory 3 under instructions from the MPU; 6 is a control signal S from the MPU;
This is a multiplexer that switches between the page memory 2 and the evaluation pattern storage memory 3.

評価パターン格納メモリ3には第3図に示す評価パター
ンTが格納されている。
The evaluation pattern storage memory 3 stores an evaluation pattern T shown in FIG.

通常動作で、評価パターンTを使用しない場合には、入
力されたデータDは書込み制御手段4によりページメモ
リ2に一旦格納された後、ページメモリ2から読出し制
御手段5により読み出され、プリントヘッドド)イバH
Dに出力される。
In normal operation, when the evaluation pattern T is not used, the input data D is once stored in the page memory 2 by the write control means 4, and then read out from the page memory 2 by the read control means 5, and then D) Iba H
Output to D.

次に、評価パターンTを用いた印刷動作を以下に説明す
る。
Next, a printing operation using evaluation pattern T will be described below.

図示しないフロントパネル等のスイッチ操作により、評
価パターン印刷モードと印刷すべき評価パターンTが選
択されると、印刷装置全体を制御するMPUは、まず、
マルチプレクサ6に与える制御信号Sを反転させて評価
パターン格納メモリ3の評価パターンTを選択するよう
にする。
When the evaluation pattern print mode and the evaluation pattern T to be printed are selected by operating a switch on a front panel (not shown), etc., the MPU, which controls the entire printing apparatus, first
The control signal S applied to the multiplexer 6 is inverted to select the evaluation pattern T in the evaluation pattern storage memory 3.

そして、MPUは図示しない記録紙が印刷装置の所定の
位置に来たときに評価゛パターン格納メモリ3へのアク
セスを開始し、所定の周期でアドレスの更新とデータの
読出しを順次行う。
Then, the MPU starts accessing the evaluation pattern storage memory 3 when a recording paper (not shown) reaches a predetermined position in the printing device, and sequentially updates addresses and reads data at a predetermined cycle.

1ページの印刷が終了すると印刷シーケンスを終了し、
マルチプレクサ6に与える制御信号Sを反転させて外部
データDを選択するようにし、評価パターン印刷動作を
終了して次の印刷に備える。
When one page has been printed, the print sequence ends,
The control signal S applied to the multiplexer 6 is inverted to select the external data D, and the evaluation pattern printing operation is completed to prepare for the next printing.

本実施例では評価パターンT(7)1ページの印刷が終
了した後、マルチプレクサ6の制御信号Sを反転させ外
部データに切り換えたが、評価パターンTの最終行を印
刷した後、直ちにマルチプレクサ6の制?![号Sを外
部データに切り換えるようにしてもよい、これにより評
価パターンTと本来印刷したい画像を同時に確認するこ
とができる。
In this embodiment, after the printing of one page of the evaluation pattern T (7) was completed, the control signal S of the multiplexer 6 was inverted and switched to external data. Regulation? ! [No. S may be switched to external data. This allows the evaluation pattern T and the image originally desired to be printed to be confirmed at the same time.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明によれば位置合わせ精度確
認用の評価パターンを印刷する手段を備えているので、
機構部品の劣化や汚れによる経時変化に起因する位置合
わせ精度の確認が容易に可能となる。また、評価パター
ンを評価の厳しいものから平均的なものまで用意するこ
とにより、種々のカラー印刷装置に適用できるとともに
、位置ずれ量のみならず人間の視覚による主観的な量も
同時に明確にすることができる。
As explained above, according to the present invention, since a means for printing an evaluation pattern for checking alignment accuracy is provided,
It becomes possible to easily check the alignment accuracy due to changes over time due to deterioration or dirt in mechanical parts. In addition, by preparing evaluation patterns ranging from those with severe evaluations to those with average evaluations, it is possible to apply it to various color printing devices, and at the same time clarify not only the amount of positional deviation but also the subjective amount determined by human vision. I can do it.

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

第1図は本発明の原理構成図、 第2図は本発明の一実施例構成図、 第3図は本発明の評価パターン図、及び第4図は主観評
価量と位置ずれ量との関係を示す評価グラフである。 (符号の説明) 1・・・データ入力インタフェース、 2・・・ページメモリ、 3・・・評価パターン格納メモリ、 4・・・書込み制御手段、 5・・・読出し制御手段、
6・・・マルチプレクサ、 S・・・制御信号、T・・
・評価パターン。 本発明の原理構成図 第1図 五ノV きIt′11 (!
Figure 1 is a diagram of the principle configuration of the present invention, Figure 2 is a diagram of the configuration of an embodiment of the present invention, Figure 3 is a diagram of the evaluation pattern of the present invention, and Figure 4 is the relationship between subjective evaluation amount and positional deviation amount. It is an evaluation graph showing. (Explanation of symbols) 1...Data input interface, 2...Page memory, 3...Evaluation pattern storage memory, 4...Writing control means, 5...Reading control means,
6...Multiplexer, S...Control signal, T...
・Evaluation pattern. Principle configuration diagram of the present invention FIG.

Claims (1)

【特許請求の範囲】 1、3原色のうち少なくとも2色以上の重ね合わせによ
るカラー印刷の位置ずれ評価方式であって、 印刷すべき画像データを格納する第1の記憶手段(A)
と、 線幅と線色と線周囲の背景色との組合せを変えた複数の
評価パターン、及び主観評価値と位置ずれの関係を示す
評価情報を格納する第2の記憶手段(B)と、 該第1の記憶手段と第2の記憶手段を切り換える選択手
段(C)とを備え、 カラー印刷の開始前に該複数の評価パターンを順次読み
出してカラー印刷を行い、所定の評価パターンを選択し
た後、該評価情報を参照して該所定の評価パターンに合
致した特性に基づき3原色の位置ずれ量を決定するよう
にしたとを特徴とするカラー印刷の位置ずれ評価方式。 2、該評価パターンは、最も厳しい評価となるパターン
と、比較的厳しい評価となるパターンと、平均的な評価
となるパターンからなる請求項1に記載のカラー印刷の
位置ずれ評価方式。
[Claims] A method for evaluating positional deviation in color printing by superimposing at least two or more colors out of one or three primary colors, comprising: a first storage means (A) for storing image data to be printed;
and a second storage means (B) for storing a plurality of evaluation patterns with different combinations of line widths, line colors, and background colors around the lines, and evaluation information indicating the relationship between subjective evaluation values and positional deviations; A selection means (C) for switching between the first storage means and the second storage means is provided, and before the start of color printing, the plurality of evaluation patterns are sequentially read out, color printing is performed, and a predetermined evaluation pattern is selected. and then referring to the evaluation information to determine the amount of positional deviation of the three primary colors based on the characteristics that match the predetermined evaluation pattern. 2. The color printing misregistration evaluation method according to claim 1, wherein the evaluation pattern includes a pattern that gives the most severe evaluation, a pattern that gives a relatively severe evaluation, and a pattern that gives an average evaluation.
JP2246108A 1990-09-18 1990-09-18 Misregistration evaluation method Pending JPH04126282A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2246108A JPH04126282A (en) 1990-09-18 1990-09-18 Misregistration evaluation method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2246108A JPH04126282A (en) 1990-09-18 1990-09-18 Misregistration evaluation method

Publications (1)

Publication Number Publication Date
JPH04126282A true JPH04126282A (en) 1992-04-27

Family

ID=17143603

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2246108A Pending JPH04126282A (en) 1990-09-18 1990-09-18 Misregistration evaluation method

Country Status (1)

Country Link
JP (1) JPH04126282A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6118463A (en) * 1997-03-19 2000-09-12 Fujitsu Limited Positional error correction for color image forming apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6118463A (en) * 1997-03-19 2000-09-12 Fujitsu Limited Positional error correction for color image forming apparatus

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