JPH04166729A - Color-difference judging method - Google Patents
Color-difference judging methodInfo
- Publication number
- JPH04166729A JPH04166729A JP29299490A JP29299490A JPH04166729A JP H04166729 A JPH04166729 A JP H04166729A JP 29299490 A JP29299490 A JP 29299490A JP 29299490 A JP29299490 A JP 29299490A JP H04166729 A JPH04166729 A JP H04166729A
- Authority
- JP
- Japan
- Prior art keywords
- color
- good
- defective
- difference
- axis
- 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
- 238000000034 method Methods 0.000 title claims description 16
- 239000003086 colorant Substances 0.000 claims abstract description 7
- 230000002950 deficient Effects 0.000 claims description 33
- 239000000463 material Substances 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 abstract 2
- 201000010099 disease Diseases 0.000 description 5
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
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- Spectrometry And Color Measurement (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、印刷物の色差（色彩の差）を判定する方法に
関し、詳しくは、多色刷り印刷における刷り上がり印刷
物の表面色と目標とする印刷物の表面色との色差を判定
する方法に関する。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for determining the color difference (color difference) of printed matter, and more particularly, the present invention relates to a method for determining the color difference (color difference) of printed matter. This invention relates to a method for determining a color difference from a surface color.
［従来の技術］
従来、多色刷り印刷において、調色時点での刷り上がり
印刷物の色の良否の判断や、目標の色と異なる場合にイ
ンキをどう調色したら良いかの推測等は、熟練者の勘と
経験にのみ頼っていたため、例えば熟練者が不在の時な
どは印刷工程を先に進めることができず不都合が生じて
いた。また、印刷作業の能率化、自動化という観点から
も、勘や経験等に頼らなくても刷り上がり印刷物の色の
良否の判断を簡便にかつ迅速に行える方法か望まれてい
た。[Prior Art] Conventionally, in multicolor printing, it has been difficult for experts to judge whether the color of the printed printed matter is good or bad at the time of color mixing, or to guess how to mix the ink when the color is different from the target color. Because it relied only on intuition and experience, it was inconvenient that the printing process could not be moved ahead, for example, when an experienced person was absent. Furthermore, from the viewpoint of streamlining and automating printing operations, there has been a desire for a method that can easily and quickly determine the quality of the colors of printed materials without relying on intuition or experience.
［発明が解決しようとする課題］
本発明は上記従来の課題に鑑みなされたもので、その目
的は、良品判定領域を基準とする目標色と刷り上がり印
刷物の表面色との色差を判定することにより、刷り上が
り印刷物の色の良否判断が勘や経験等に頼らなくても簡
便かつ迅速に行えることを可能にする色差判定方法を提
供することにある。[Problems to be Solved by the Invention] The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to determine the color difference between the target color based on the non-defective judgment area and the surface color of the finished printed matter. An object of the present invention is to provide a color difference determination method that allows the determination of the quality of the color of a printed matter to be performed simply and quickly without relying on intuition or experience.
［課題を解決するための手段］
上記目的を達成するために、本発明の色差判定方法は、
ある見本柄に対し良品と判断された印刷物の表面色の３
属性（色相、明度、彩度）についてのデータの集まりの
中から一番外側の良品点間を直線で結んでその見本柄に
対する良品判定領域を作成し、この良品判定領域を目標
色の基準として刷り上がり印刷物の表面色と目標色との
色差を判定することを特徴とする。[Means for Solving the Problems] In order to achieve the above object, the color difference determination method of the present invention includes the following:
3 surface colors of printed matter judged to be good for a certain sample pattern
From a collection of data on attributes (hue, brightness, saturation), connect the outermost non-defective points with a straight line to create a non-defective judgment area for that sample pattern, and use this non-defective judgment area as the standard for the target color. It is characterized by determining the color difference between the surface color of the finished printed matter and the target color.
［作用］
このような本発明にあっては、ある見本柄に対し良品と
判断された印刷物の表面色について蓄積された３属性の
データを基にしてその見本柄に対する良品判定領域を作
成し、刷り上がりの印刷物につき測定した３属性のデー
タがこの良品判定領域内に入っているかどうかで刷り上
がり印刷物の色の良否の判断ができる。従って、この良
否の判断は勘や経験等に頼らなくても簡便かつ迅速に行
えて、しかも色の３属性のデータを基準としており、判
定の正確度もしくは信頼度は非常に高い。[Operation] According to the present invention, a non-defective product determination area for a certain sample pattern is created based on data of three attributes accumulated regarding the surface color of a printed matter that is determined to be non-defective for that sample pattern, It is possible to judge whether the color of the finished printed matter is good or bad depending on whether the data of the three attributes measured on the finished printed matter are within this non-defective determination area. Therefore, this judgment of quality can be easily and quickly made without relying on intuition or experience, and is based on data on the three attributes of color, so the accuracy or reliability of the judgment is extremely high.
また、刷り上がり印刷物のデータが上記良品判定領域内
に入っていない場合には、その色差のデータから、刷り
上がり印刷物の色の３属性を、どの方向にどの位動かし
たら目標の印刷物になるかを知ることができ、これをも
とにインキをどう調色したら良いかの推測ができる。In addition, if the data of the finished print does not fall within the above-mentioned non-defective judgment area, from the color difference data, it is possible to know in which direction and by how much the three attributes of the color of the finished print should be moved to achieve the target print. Based on this, it is possible to infer how to mix the ink.
［実施例コ 以下、本発明を実施例により詳述する。[Example code] Hereinafter, the present invention will be explained in detail with reference to Examples.
本発明の色差判定方法は、市販の色彩計、パーソナルコ
ンピュータ及び被測定印刷物を固定する簡単な位置決め
固定台等を用いた安価で小型軽量なシステム構成により
実施することができる。The color difference determination method of the present invention can be implemented with an inexpensive, small and lightweight system configuration using a commercially available colorimeter, a personal computer, a simple positioning fixture for fixing the printed material to be measured, and the like.
第１図は本発明の色差判定方法のフローチャート図であ
る。FIG. 1 is a flowchart of the color difference determination method of the present invention.
パーソナルコンピュータに予め見本柄に関する情報を登
録しておくと、印刷物を測色する前に既に登録済の見本
柄の番号を検索し同じ番号がある時はその柄に関する情
報が表示される。If information about sample patterns is registered in advance in the personal computer, before measuring the color of printed matter, the number of the already registered sample pattern is searched, and if the same number is found, information about that pattern is displayed.
本発明では、ある見本柄に対し以前に熟練者が良品とし
て判定し出荷された印刷物に関するデータ、具体的には
表面色の３属性（色相、明度、彩度）のデータをその見
本柄の良品データとして保存しておく。この良品として
保存されたデータの集まりの中から一番外側の良品点間
を直線で結び、その見本柄に対する良品判定領域を作成
する。良品判定領域の作成方法について、第２図のフロ
ーチャート、及び第３図を用いて具体的に説明する。In the present invention, data regarding printed matter that has been previously determined by an expert as a good product for a certain sample pattern and shipped, specifically data on three surface color attributes (hue, brightness, and saturation), is used to collect data on printed matter that has been shipped as a good product for a certain sample pattern. Save it as data. From this collection of data stored as non-defective products, the outermost non-defective points are connected with a straight line to create a non-defective determination area for that sample pattern. A method for creating a non-defective determination area will be specifically explained using the flowchart of FIG. 2 and FIG. 3.
■Ｘ、 Ｙ座標平面上のｎ個の良品点Ａｌ、Ａ２゜Ａ３
．−−＋、Ａｎを想定する（第３図）。■N non-defective points Al, A2゜A3 on the X, Y coordinate plane
．． −−+, An is assumed (Fig. 3).
■ｎ個の良品点の中からＹ軸座標値で最大値となる点（
同図（ａ）中ではＡ５）を求める。■The point with the maximum Y-axis coordinate value among n non-defective points (
In the figure (a), A5) is obtained.
■ｎ個の良品点の中からＹ軸座標値で最小値となる点（
同図（ａ）中ではＡＩ）を求める。■The point with the minimum Y-axis coordinate value among n non-defective points (
In the figure (a), AI) is determined.
■Ａ１点を始点とする。■Start at point A1.
■始点以外の全ての点を終点と想定した仮想直線と、始
点（例 同図（ａ）中のＡｌ）よりＸ軸に平行な補助線
Ｂを引く。■ Draw a virtual straight line assuming all points other than the starting point as the ending point, and draw an auxiliary line B parallel to the X-axis from the starting point (eg, Al in (a) of the same figure).
■補助線Ｂと■で求めた仮想直線との角（同図（ａ）中
では／ＢＡ Ｉ Ａ ２）を求める。■ Find the angle between the auxiliary line B and the virtual straight line found in ■ (/BA I A 2 in the figure (a)).
■全ての仮想直線と補助線Ｂとの角で最小値となる点（
同図（ａ）中ではＡ２）を終点とする。■The point that has the minimum value at the angle between all virtual straight lines and auxiliary line B (
In the figure (a), A2) is the end point.
■始点と終点間を直線で結ぶ。■Connect the starting point and ending point with a straight line.
■終点を始点とする。■The end point is the starting point.
［相］終点を始点とした点がＹ軸座標値で最大値となる
点（同図（ａ）中ではＡ５）になるまで■から■までを
繰り返す。[Phase] Repeat steps from ■ to ■ until the end point is the starting point and the point reaches the maximum Y-axis coordinate value (A5 in the figure (a)).
ＯＡ５点を始点とする（同図（ｂ））。The OA5 point is the starting point ((b) in the same figure).
＠始点以外の全ての点を終点と想定した仮想直線と、始
点（例 同図（ｂ）中のＡ５）よりＸ軸に平行な補助Ｊ
ＩＢ’ を引く。@A virtual straight line assuming all points other than the starting point as the ending point, and an auxiliary J parallel to the X axis from the starting point (e.g. A5 in (b) of the same figure)
Subtract IB'.
０補助線Ｂ゛ と■で求めた仮想直線との角（同図（ｂ
）中ではＺＢ’ Ａ５Ａ６）を求める。The angle between the 0 auxiliary line B゛ and the virtual straight line found in ■ (the same figure (b)
), find ZB' A5A6).
■全ての仮想直線と補助線Ｂ° との角で１８０度以上
で最小値となる点（同図（ｂ）中ではＡ６）を終点とす
る。(2) The end point is the point (A6 in the figure (b)) where the angle between all the virtual straight lines and the auxiliary line B° has a minimum value of 180 degrees or more.
［相］始点と終点間を直線で結ぶ。[Phase] Connect the starting point and ending point with a straight line.
［相］終点を始点とする。[Phase] The end point is the starting point.
■終点を始点とした点かＹ軸座標値で最小値となる点（
同図（ｂ）中ではＡｌ）になるまで■から［相］までを
繰り返す。■The point with the end point as the starting point or the point that has the minimum value in the Y-axis coordinate value (
In the figure (b), steps from ■ to [phase] are repeated until Al) is reached.
このようにして良品データの集まりの中から一番外側の
良品点間を直線で結んで良品判定領域を作成することが
できるが、熟練者の判定結果を基にした見本柄の良品デ
ータを例えばフロッピーディスク等に保存しておき、こ
の保存されたデータを取り出した後、コンピュータ処理
を行えば、自動的に良品判定領域を作成することが可能
となる。In this way, it is possible to create a non-defective product judgment area by connecting the outermost non-defective points from a collection of non-defective product data with a straight line. If the data is stored on a floppy disk or the like, and then processed by a computer after being retrieved, it becomes possible to automatically create a non-defective determination area.
こうして予め登録されたすべての見本病に対してその良
品判定領域を作成する。In this way, good product determination areas are created for all sample diseases registered in advance.
良品判定領域を作成したものの一例を第４図に示した。An example of a created non-defective determination area is shown in FIG. 4.
色差の表示は、見本病を中心として横軸（Ｘ軸）に色相
差、縦軸（Ｙ軸）に明度差の平面座標（同図（ａ））と
、横軸（Ｘ軸）に彩度差、縦軸（Ｙ軸）に明度差の平面
座標（同図（ｂ））の２つの座標平面上に表示している
。色の３属性、色相、明度及び彩度は三次元の色空間上
に表示されるので、これを平面面上で評価するために、
上記２つの座標平面上に表示している。なお、第４図で
は、色差の表示は見本病を中心としているが、指定した
印刷物を中心にして全体を平行移動して表示することも
できる。The color difference is displayed by plotting the horizontal axis (X-axis) as the hue difference, the vertical axis (Y-axis) as the brightness difference (see figure (a)), and the horizontal axis (X-axis) as the color difference. It is displayed on two coordinate planes: the degree difference and the brightness difference on the vertical axis (Y-axis) (FIG. 2(b)). The three attributes of color, hue, brightness, and saturation, are displayed on a three-dimensional color space, so in order to evaluate them on a flat surface,
It is displayed on the above two coordinate planes. In FIG. 4, the color difference is displayed centered on the sample, but it is also possible to display the entire display by moving it in parallel with the specified printed matter at the center.
この良品判定領域を目標色の基準として、刷り上がりの
印刷物の表面色と目標色との色差判定を行ない、該印刷
物の良否を判断する。具体的方法としでは、刷り上がり
印刷物の表面色を測定し、その測定結果（３属性データ
）を前記２つの座標平面上に表示し、前記良品判定領域
内に入っていれば、色については合格と判断し、本機印
刷を開始できる。Using this non-defective determination area as a reference for the target color, a color difference between the surface color of the finished printed matter and the target color is determined, and the quality of the printed matter is determined. A specific method is to measure the surface color of the finished printed matter, display the measurement results (three attribute data) on the two coordinate planes, and if it falls within the acceptable product judgment area, the color is passed. The machine can determine this and start printing.
一方、上記測定結果が前記良品判定領域内に入っていな
い場合には、その色差のデータから、調色時点の刷り上
がり印刷物の色の３属性を、どの方向にどの位動かした
ら目標色が得られるかを知ることができ、これをもとに
インキをどう調色したら良いかの推測ができる。On the other hand, if the above measurement result does not fall within the above-mentioned non-defective judgment area, based on the color difference data, it is possible to obtain the target color in which direction and by how much the three attributes of the color of the finished printed matter at the time of toning should be moved. Based on this information, it is possible to estimate how the color of the ink should be adjusted.
なお、刷り上がり印刷物の測色は、位置決め固定台上の
予め位置決めされた複数の測定箇所の測定を順次行なっ
ていくロボット等を使用すれば自動測定も可能となる。Incidentally, the color measurement of the finished printed matter can be automatically measured by using a robot or the like that sequentially measures a plurality of measurement points pre-positioned on a positioning and fixing table.
また、以前に良品と判定した印刷物でも出荷先で不良と
判定された場合には見本病に関する良品データの中から
そのデータを不良品に変更でき、変更したデータをもと
に新たに良品判定領域を作成すればよい。In addition, if a printed product that was previously determined to be good is determined to be defective at the shipping destination, that data can be changed to a defective product from the good product data related to sample disease, and a new good product is determined based on the changed data. Just create an area.
［発明の効果］
以上詳細に説明したように、本発明の色差判定方法は、
ある見本病に対し良品と判断された印刷物の表面色につ
いて蓄積された３属性のデータを基にしてその見本病に
対する良品判定領域を作成し、この良品判定領域を目標
色の基準として刷り上がり印刷物の表面色と目標色との
色差を判定するものであり、刷り上がりの印刷物につき
測定した３属性のデータがこの良品判定領域内に入って
いるかどうかで刷り上がり印刷物の色の良否の判断がで
きるので、この良否の判断は勘や経験等に頼らなくても
簡便かつ迅速に行える。しかも、色の３属性のデータを
基準とするため、判定の正確度もしくは信頼度は非常に
高い。また、刷り上がり印刷物のデータが上記良品判定
領域内に入っていない場合には、その色差のデータから
、刷り上がり印刷物の色の３属性をどの方向にどの位動
かしたら目標の印刷物になるかを知ることができ、これ
をもとにインキをどう調色したら良いかの推測ができる
。[Effects of the Invention] As explained in detail above, the color difference determination method of the present invention has the following effects:
Based on data on three attributes accumulated regarding the surface color of printed matter judged to be good for a certain sample disease, a good product judgment area for that sample disease is created, and this non-defective judgment area is used as the target color standard for printing. This is to judge the color difference between the surface color of the printed matter and the target color, and it is possible to judge whether the color of the finished printed matter is good or bad depending on whether the data of the three attributes measured on the finished printed matter are within the acceptable quality judgment range. This judgment of quality can be easily and quickly made without relying on intuition or experience. Furthermore, since the data of the three color attributes is used as the standard, the accuracy or reliability of the determination is extremely high. In addition, if the data of the finished print does not fall within the above-mentioned non-defective judgment area, it is possible to know from the color difference data which direction and how much to move the three color attributes of the finished print to achieve the target print. Based on this, it is possible to infer how to mix the ink.
また、出荷した製品を測色、蓄積することで、過去の出
荷色が目標色に対しどう分布しているのか一目でわかる
様に表示することもでき、出荷管理や品質の安定に有効
である。In addition, by measuring and storing the color of shipped products, it is possible to display at a glance how the past shipped colors are distributed with respect to the target color, which is effective for shipping management and quality stability. .
第１図は本発明の色差判定方法のフローチャート図、第
２図は良品判定領域作成のフローチャート図、第３図（
ａ）（ｂ）は良品判定領域作成の具体的方法を説明する
ための座標平面図、第４図（ａ）（ｂ）は良品判定領域
の一例を示す座標平面図である。
Ａｌ、Ａ２．Ａ３．−−−、Ａｎ
・・・ある見本病に対する
良品データ（良品点）FIG. 1 is a flowchart of the color difference determination method of the present invention, FIG. 2 is a flowchart of creating a non-defective determination area, and FIG.
FIGS. 4A and 4B are coordinate plan views for explaining a specific method of creating a non-defective determination area, and FIGS. 4A and 4B are coordinate plan views showing an example of a non-defective determination area. Al, A2. A3. ---, An...Non-defective data for a certain sample disease (non-defective point)
Claims (1)
属性（色相、明度、彩度）についてのデータの集まりの
中から一番外側の良品点間を直線で結んでその見本柄に
対する良品判定領域を作成し、この良品判定領域を目標
色の基準として刷り上がり印刷物の表面色と目標色との
色差を判定することを特徴とする色差判定方法。3 surface colors of printed matter judged to be good for a certain sample pattern
From a collection of data on attributes (hue, brightness, saturation), connect the outermost non-defective points with a straight line to create a non-defective judgment area for that sample pattern, and use this non-defective judgment area as the standard for the target color. A color difference determination method characterized by determining the color difference between the surface color of a finished printed matter and a target color.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29299490A JPH04166729A (en) | 1990-10-30 | 1990-10-30 | Color-difference judging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29299490A JPH04166729A (en) | 1990-10-30 | 1990-10-30 | Color-difference judging method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04166729A true JPH04166729A (en) | 1992-06-12 |
Family
ID=17789100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29299490A Pending JPH04166729A (en) | 1990-10-30 | 1990-10-30 | Color-difference judging method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04166729A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007047045A (en) * | 2005-08-10 | 2007-02-22 | Olympus Corp | Apparatus, method and program for image processing |
-
1990
- 1990-10-30 JP JP29299490A patent/JPH04166729A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007047045A (en) * | 2005-08-10 | 2007-02-22 | Olympus Corp | Apparatus, method and program for image processing |
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