JPS628043A - Method for correcting dencity - Google Patents
Method for correcting dencityInfo
- Publication number
- JPS628043A JPS628043A JP14638585A JP14638585A JPS628043A JP S628043 A JPS628043 A JP S628043A JP 14638585 A JP14638585 A JP 14638585A JP 14638585 A JP14638585 A JP 14638585A JP S628043 A JPS628043 A JP S628043A
- Authority
- JP
- Japan
- Prior art keywords
- concentration
- density
- measured
- standard plate
- light
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
- G01N21/274—Calibration, base line adjustment, drift correction
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、濃度計に用いられる濃度校正方法に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a concentration calibration method used in a concentration meter.
感光材料の性能を評価したり、あるいは画像記録装置の
階調表現能力を評価したりするために、濃度計が用いら
れる。この濃度計は、測定光路に配置した試料を光源で
照明し、この試料からの光を受光器で光電変換してから
処理回路に送り、ここで濃度値に変換して表示する構成
になっており、試料の照明の仕方から２つの種類がある
。その１つは、試料の透過光を測定する透過形であり、
もう１つは試料の表面で反射した光を測定する反射形で
ある。Densitometers are used to evaluate the performance of photosensitive materials or the gradation expression ability of image recording devices. This densitometer has a structure in which a light source illuminates a sample placed in the measurement optical path, the light from the sample is photoelectrically converted by a receiver, and then sent to a processing circuit, where it is converted into a concentration value and displayed. There are two types depending on how the sample is illuminated. One is the transmission type, which measures the transmitted light of the sample.
The other type is a reflection type that measures the light reflected from the surface of the sample.
一般的に、光源の輝度、受光器の感度等は、経時変化を
受けて変動するため、この変動に応じた誤差が測定値に
含まれている。したがって、高精度の測定を行うには、
測定値を校正して誤差を取り除くことが必要である。従
来の濃度校正方法としては、例えば特公昭５９二３９６
ｇ ４号公報に記載されているように、濃度が既知の
１個の標準板を用い、この標準板を測定して照準板測定
濃度を求め、これから補正係数を算出して、試料の測定
濃度を校正するようにした方法が知られている。In general, the brightness of a light source, the sensitivity of a light receiver, and the like vary over time, and thus errors corresponding to these variations are included in the measured value. Therefore, for highly accurate measurements,
It is necessary to calibrate the measurements to remove errors. As a conventional concentration calibration method, for example, Japanese Patent Publication No. 592-396
g As described in Publication No. 4, use one standard plate with a known concentration, measure this standard plate to obtain the concentration measured by the aiming plate, calculate the correction coefficient from this, and calculate the measured concentration of the sample. There are known methods for calibrating the .
測定範囲内の全てにおいて、誤差が同じであれば、前述
°した校正方法は有益であるが、実際は受光器の感度特
性等の影響により、誤差にバラツキがあるため、従来の
方法では濃度校正を正しく行うことができなかった。The calibration method described above is useful if the error is the same throughout the measurement range, but in reality, the error varies due to the influence of the sensitivity characteristics of the photoreceptor, so conventional methods do not perform concentration calibration. I couldn't do it right.
本発明は、濃度測定範囲の全域において、濃度校正を正
しく行うことができるようにした濃度校正方法を提供す
ることを目的とするものである。SUMMARY OF THE INVENTION An object of the present invention is to provide a concentration calibration method that allows concentration calibration to be performed correctly over the entire concentration measurement range.
上記問題点を解決するために、本発明は、濃度が既知の
複数の標準板を用い、これらを測定光路にそれぞれ挿入
して標準板測定濃度を求め、これらの標準板測定濃度を
境界点として濃度測定範囲を複数の濃度エリヤに分割し
、各濃度エリヤ毎に補正係数と及び定数を求め、この濃
度エリヤに応じた補正係数と定数を用いて試料の測定濃
度を校正するようにしたものである。In order to solve the above problems, the present invention uses a plurality of standard plates with known densities, inserts each of these into the measurement optical path to obtain the measured concentration of the standard plate, and uses the measured concentration of these standard plates as a boundary point. The concentration measurement range is divided into multiple concentration areas, a correction coefficient and a constant are determined for each concentration area, and the measured concentration of the sample is calibrated using the correction coefficient and constant according to this concentration area. be.
以下、図面を参照して本発明の一実施例について詳細に
説明する。Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.
濃度計の概略を示す第１図において、光源１０から放出
された白色光は、集光レンズ１）により透明なステージ
１２に集光される。このステージ１２には、試料１３が
載置されており、この試料１３がスポット状に照明され
る。試料１３を透過したスポット光は、集光レンズ１４
で受光器１５に集光される。In FIG. 1, which schematically shows a densitometer, white light emitted from a light source 10 is focused onto a transparent stage 12 by a condensing lens 1). A sample 13 is placed on this stage 12, and this sample 13 is illuminated in a spot shape. The spot light transmitted through the sample 13 is passed through the condensing lens 14
The light is focused on the light receiver 15.
前記集光レンズ１４と受光器１５との間には、モータ１
７０回転軸１８に連結したターレフト１９が配置されて
いる。このターレット１９は、第２図に示すように、１
個の穴２０と、濃度が既知の３個の標準板２１〜２３と
が等間隔に設けられており、測定準備モードでは穴２０
及び３個の標準板２１〜２３とが測定光路２４に挿入さ
れ、そして測定モードでは穴２０だけが測定光路２４に
挿入される。前記標準板２１の濃度はＤＳ、であり、標
準板２２はＤＳ、であり、標準板２３はＤＳ３であり、
これらはＤＳＩ ＜ＤＳＩ ＜ＤＳ３になっており、濃
度測定範囲をほぼ３等分するような値のものが選ばれて
いる。位置検出器２５は、ターレット１９に設けたマー
ク等を光学的に検出して、標準板２１〜２３．穴２０が
測定光路２４に入っていることを検出する。A motor 1 is provided between the condenser lens 14 and the light receiver 15.
A turret 19 connected to the 70 rotary shaft 18 is arranged. As shown in FIG.
holes 20 and three standard plates 21 to 23 with known concentrations are provided at equal intervals, and in the measurement preparation mode, the holes 20
and three standard plates 21 to 23 are inserted into the measurement optical path 24, and only the hole 20 is inserted into the measurement optical path 24 in the measurement mode. The concentration of the standard plate 21 is DS, the standard plate 22 is DS, and the standard plate 23 is DS3,
These values satisfy the relationship DSI < DSI < DS3, and values that divide the concentration measurement range into approximately three equal parts are selected. The position detector 25 optically detects marks and the like provided on the turret 19 and detects the standard plates 21 to 23 . It is detected that the hole 20 enters the measurement optical path 24.
前記受光器１５は、入射した光を電気信号に変換してこ
れを増幅器２６に送る。この増幅器２６で増幅された信
号は、Ａ／Ｄ変換器２７に送られ、位置検出器２５から
の位置信号に同期したタインミングでデジタル信号に変
換される。このデジタル信号は、対数変換器２８で濃度
値に変換されてから、演算部２９に送られる。この演算
部２９は、試料の測定、濃度を校正してから、これを表
示器３０に送って表示する。The light receiver 15 converts the incident light into an electrical signal and sends it to the amplifier 26. The signal amplified by this amplifier 26 is sent to an A/D converter 27 and converted into a digital signal at a timing synchronized with the position signal from the position detector 25. This digital signal is converted into a density value by a logarithmic converter 28 and then sent to a calculation section 29. The calculation unit 29 measures the sample and calibrates the concentration, and then sends this to the display 30 for display.
測定準備モードでは、モータ１７によりターレット１９
を回転させて、第１番目から第３番目の標準板２１〜２
３及び穴２０を撮影光路２４に挿入し、かつ試料１３が
ない状態で濃度を測定する。In the measurement preparation mode, the motor 17 moves the turret 19
Rotate the first to third standard plates 21 to 2.
3 and the hole 20 are inserted into the photographing optical path 24, and the density is measured without the sample 13.
なお、穴２０は、測定準備モードでは、濃度がＤＳｏの
標準板であると見なした方が説明に便利であるので、θ
番目の標準板として取り扱う。第Ｏ番〜第３番目の標準
板２０〜２３の測定濃度（標準板測定濃度）Ｄｍｘは、
演算部２９に送られ、ここで補正係数Ａと定数にとが算
出され、メモリに記憶される。ここで、ｎは標準板の番
号を示すものである。前記補正係数Ａと定数には、隣接
された２つの標準板測定濃度で囲まれた濃度エリヤ毎に
算出されるものである。In addition, in the measurement preparation mode, it is more convenient to explain that the hole 20 is a standard plate with a concentration of DSo, so θ
Treated as the second standard plate. The measured densities of the O-th to third standard plates 20 to 23 (standard plate measured densities) Dmx are:
It is sent to the arithmetic unit 29, where the correction coefficient A and the constant are calculated and stored in the memory. Here, n indicates the number of the standard plate. The correction coefficient A and the constant are calculated for each density area surrounded by two adjacent standard plate measurement densities.
測定モードでは、ステージ１２に試料１３を載置すると
ともに、穴２０を測定光路２４に挿入した状態で測定し
、得られた試料測定濃度ＤｍＸが演算部２９に送られる
。この演算部２９は、試料測定濃度ＤｍＸが属している
濃度エリヤを判定し、この濃度エリヤに対して決められ
た補正係数Ａと定数にとを用いて演算式（１）を演算し
て、試料校正濃度Ｄｍ１を算出する。この試料校正濃度
Ｄｍ３は、表示器３０に送られて表示され、あるいはプ
リンタ等でプリントアウトされる。In the measurement mode, the sample 13 is placed on the stage 12 and measured with the hole 20 inserted into the measurement optical path 24, and the obtained measured sample concentration DmX is sent to the calculation section 29. This calculation unit 29 determines the concentration area to which the sample measured concentration DmX belongs, and calculates the calculation formula (1) using the correction coefficient A determined for this concentration area and the constant. A calibration concentration Dm1 is calculated. This sample calibration concentration Dm3 is sent to the display 30 and displayed, or printed out using a printer or the like.
ＤｍＩ＝（ＡｘＤｍＸ）十 Ｋ・・・（１）次に、直線
近似により補正係数Ａを決定する実施例について説明す
る。第３図は、縦軸に測定濃度をとり、横軸に校正濃度
をとったグラフである。DmI=(AxDmX) K (1) Next, an example in which the correction coefficient A is determined by linear approximation will be described. FIG. 3 is a graph in which the vertical axis represents the measured concentration and the horizontal axis represents the calibration concentration.
ここで、ＤＳ、〜ＤＳ３は、標準板２０〜２３の濃度で
あり、ｐｍｏ〜Ｄｍｘは実際に測定して得た標準板測定
濃度である。また、ＤＨｏ〜ＤＨ３は画濃度の差（誤差
）であり、例えばＤ Ｈｔは（ＤＳ！ −１）ｒｎ、
）で求められる。このグラフで、黒丸を付した標準板濃
度を結ぶ直線は実線で示してあり、これは４５度のｆ頃
きをもっている。また、ｘ印を付した標準板測定濃度Ｄ
ｍｏ〜Ｄ Ｔｎ ｓは点線で示す直線で結んである。Here, DS to DS3 are the concentrations of the standard plates 20 to 23, and pmo to Dmx are the measured concentrations of the standard plates actually measured. In addition, DHo to DH3 are differences (errors) in image density; for example, D Ht is (DS! -1)rn,
). In this graph, the straight line connecting the standard plate densities marked with black circles is shown as a solid line, and has an f angle of 45 degrees. In addition, the standard plate measurement density D with an x mark
mo to D Tn s are connected by straight lines indicated by dotted lines.
前記標準板測定濃度ｐｍｏ〜Ｄｍｘにより、濃度エリヤ
が３個に分割される。この各濃度エリヤ毎に直線近似で
補正係数Ａを求めると、前記演算式（１）は、次のよう
な一般式で表される。ここで、試料測定濃度Ｄｍｘは、
Ｄｍ（１）−１） ＜Ｄｍｘ ＜ｌ）ｍ、ｌを満足する
濃度エリヤに属しているものとする。The density area is divided into three areas based on the standard plate measured densities pmo to Dmx. When the correction coefficient A is determined for each density area by linear approximation, the above-mentioned arithmetic expression (1) is expressed by the following general expression. Here, the sample measurement concentration Dmx is
Dm(1)-1) <Dmx <l) It is assumed that the image belongs to a density area that satisfies m and l.
＋ ＤＨ（２１−□ ・・（２）
例えば、ＤｍＩ＜ｌ）ｍ、＜Ｄｍｌであるとすると、演
算式（２）は次のようになる。+ DH(21-□...(2) For example, assuming that DmI<l)m and <Dml, the arithmetic expression (2) becomes as follows.
上記実施例は、透過形の濃度計を示しであるが、本発明
は反射形の濃度計に対しても利用することができるもの
である。Although the above embodiment shows a transmission type densitometer, the present invention can also be applied to a reflection type densitometer.
本発明は、濃度が異なった複数の標準板を用い、この標
準板を測定光路に順番に挿入してその濃度を求め、得ら
れた標準板測定濃度を境界点として濃度測定範囲を複数
の濃度エリヤに分割するとともに、各濃度エリヤ毎に、
既知の標準板濃度と標準板測定濃度とを用いて、補正係
数及び定数を算出し、試料の測定濃度が属している濃度
エリヤの補正係数及び定数を用いてこれを校正するよう
にしたから、従来の濃度校正方法に比べて濃度測定範囲
の全域において、測定濃度値を正しく校正することがで
きる。The present invention uses a plurality of standard plates with different densities, inserts the standard plates into the measurement optical path in order to determine the concentration, and divides the concentration measurement range into multiple densities using the obtained standard plate measured concentration as a boundary point. In addition to dividing into areas, for each concentration area,
Since the correction coefficient and constant are calculated using the known standard plate concentration and the standard plate measured concentration, and this is calibrated using the correction coefficient and constant of the concentration area to which the measured concentration of the sample belongs, Compared to conventional concentration calibration methods, it is possible to calibrate measured concentration values more accurately over the entire concentration measurement range.
第１図は本発明を実施した透過形濃度計を示す概略図で
ある。
第２図はターレットの平面図である。
第３図は測定濃度と校正濃度の関係を示すグラフである
。
１０・・光源 １３・・試料
１９・・ターレット ２０・・穴
２１〜２３・・標準板 ２６・・増幅器。
□
【FIG. 1 is a schematic diagram showing a transmission type densitometer in which the present invention is implemented. FIG. 2 is a plan view of the turret. FIG. 3 is a graph showing the relationship between measured concentration and calibration concentration. 10... Light source 13... Sample 19... Turret 20... Holes 21-23... Standard plate 26... Amplifier. □ [
Claims (3)
定光路に試料を配置しない状態で、濃度値が既知の複数
の標準板を順番に挿入してその濃度値を測定し、得られ
た複数の標準板測定濃度から濃度測定範囲を複数の濃度
エリヤに分割するとともに、標準板測定濃度と、既知の
標準板濃度とから各濃度エリヤ毎に補正係数Ａと定数Ｋ
を求め、この濃度エリヤに応じた補正係数Ａと定数Ｋを
用いて試料の測定濃度を校正するようにしたことを特徴
とする濃度校正方法。(1) A measurement optical path is formed between a light source and a light receiver, and with no sample placed in this measurement optical path, a plurality of standard plates with known concentration values are inserted in order and the concentration values are measured; The concentration measurement range is divided into a plurality of concentration areas from the obtained multiple standard plate measured densities, and a correction coefficient A and a constant K are calculated for each density area from the standard plate measured densities and the known standard plate densities.
A concentration calibration method characterized in that the measured concentration of a sample is calibrated using a correction coefficient A and a constant K corresponding to the concentration area.
れた濃度エリヤに属している場合には、前記補正係数Ａ
は、次式から表されることを特徴とする特許請求の範囲
第１項記載の濃度校正方法。 Ａ＝［ＤＳ＿ｎ−ＤＳ＿（＿ｎ＿−＿１＿）］／［Ｄｍ
＿ｎ−Ｄｍ＿（＿ｎ＿−＿１＿）］ ＤＳ＿ｎ：ｎ番目の標準板濃度 Ｄｍ＿ｎ：ｎ番目の標準板測定濃度 ＤＳ＿（＿ｎ＿−＿１＿）：（ｎ−１）番目の標準板濃
度 Ｄｍ＿（＿ｎ＿−＿１＿）：（ｎ−１）番目の標準板測
定濃度(2) If the measured concentration Dm_x of the sample belongs to the concentration area defined by Dm_(n_-_1_)<Dm_x<Dm_n, the correction coefficient A
2. The concentration calibration method according to claim 1, wherein: is expressed by the following equation. A=[DS_n-DS_(_n_-_1_)]/[Dm
_n-Dm_(_n_-_1_)] DS_n: n-th standard plate density Dm_n: n-th standard plate measured density DS_(_n_-_1_): (n-1)-th standard plate density Dm_(_n_-_1_): (n-1)th standard plate measurement concentration
る特許請求の範囲第２項記載の濃度校正方法。 Ｋ＝ＤＳ＿（＿ｎ＿−＿１）−Ｄｍ＿（＿ｎ＿−＿１＿
）(3) The concentration calibration method according to claim 2, wherein the constant K is expressed by the following equation. K=DS_(_n_-_1)-Dm_(_n_-_1_
)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14638585A JPS628043A (en) | 1985-07-03 | 1985-07-03 | Method for correcting dencity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14638585A JPS628043A (en) | 1985-07-03 | 1985-07-03 | Method for correcting dencity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS628043A true JPS628043A (en) | 1987-01-16 |
Family
ID=15406504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14638585A Pending JPS628043A (en) | 1985-07-03 | 1985-07-03 | Method for correcting dencity |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS628043A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63165560U (en) * | 1987-04-16 | 1988-10-27 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52108195A (en) * | 1976-03-08 | 1977-09-10 | Fuji Photo Film Co Ltd | Optical density measurement |
| JPS5729931A (en) * | 1980-07-30 | 1982-02-18 | Yokogawa Hokushin Electric Corp | Method and device for measuring moisture quantity and moisture percentage and so on of paper |
-
1985
- 1985-07-03 JP JP14638585A patent/JPS628043A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52108195A (en) * | 1976-03-08 | 1977-09-10 | Fuji Photo Film Co Ltd | Optical density measurement |
| JPS5729931A (en) * | 1980-07-30 | 1982-02-18 | Yokogawa Hokushin Electric Corp | Method and device for measuring moisture quantity and moisture percentage and so on of paper |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63165560U (en) * | 1987-04-16 | 1988-10-27 |
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