JPH02236127A - Method and apparatus for measuring color - Google Patents
Method and apparatus for measuring colorInfo
- Publication number
- JPH02236127A JPH02236127A JP5738089A JP5738089A JPH02236127A JP H02236127 A JPH02236127 A JP H02236127A JP 5738089 A JP5738089 A JP 5738089A JP 5738089 A JP5738089 A JP 5738089A JP H02236127 A JPH02236127 A JP H02236127A
- Authority
- JP
- Japan
- Prior art keywords
- light
- fiber
- measured
- color
- receiving
- 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 abstract description 13
- 239000000835 fiber Substances 0.000 claims abstract description 50
- 239000002344 surface layer Substances 0.000 claims abstract description 12
- 230000035945 sensitivity Effects 0.000 claims abstract description 9
- 210000002615 epidermis Anatomy 0.000 claims description 2
- 210000003491 skin Anatomy 0.000 claims 1
- 239000013307 optical fiber Substances 0.000 abstract description 11
- 229910052736 halogen Inorganic materials 0.000 abstract description 6
- 150000002367 halogens Chemical class 0.000 abstract description 6
- 230000005611 electricity Effects 0.000 abstract 1
- 241000196324 Embryophyta Species 0.000 description 8
- 244000062793 Sorghum vulgare Species 0.000 description 4
- 235000019713 millet Nutrition 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 244000188595 Brassica sinapistrum Species 0.000 description 1
- 235000004977 Brassica sinapistrum Nutrition 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000028327 secretion Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、例えば、植物などの菜の色の変化を測定する
色の測定装置に関するものである．（発明の背景及び発
明が解決しようとするｎ題）一般に、植物などの被測定
物の色の変化などを測定する場合、植物の粟の表面に白
色光を照射してその表面反射光により植物の色を観察す
るが、植物の菜の表面は様々な形状であるうえ、生体か
らの様々な分泌物等が付着しており、従来の表面反射光
の色を測定する方法では正確な莱自身の色の測定が困難
である．
本発明は、かかる問題に着目してなされたもので、被測
定物の表層部の色をより正確に測定することの出来る色
の測定方法及び装置を提供することを目的とする．
（ＨＭを解決するための手段）
上記課題を解決するために、本発明の請求項１にかかる
色の測定方法は、
光が内部に浸透可能な被測定物の色の測定方法において
、
先端部の断面構成が芯偏に受光ファイバを有しこの受光
ファイバを取り囲む表皮側に光を照射する投光ファイバ
を配設する構成とされているセンサヘッドの先端部を前
記被測定物の表面に密着さ前記投光ファイバから前記被
測定物の内部に白色光を注入すると共に、この白色光が
前記被測定物の表層部において拡散反射するときの着色
光を前記受光ファイバによって受光し、
前記受光ファイバに導入された着色光を、可視光域の異
なる波長に感度のピークを持つ、少なくとも２個の光電
変換素子を内蔵した受光素子に導き、
この受光素子の出力ｊｔ一二の一一１−嶋一に基づいて
前記被測定物の表層部分の色を測定することを特徴とす
る．
又、本発明の請゛求項２にかかる色の測定装置は，先端
部の断面構成が、芯偏に受光ファイバが配設され表皮側
に光を照射する投光ファイバが配設される構成とされ、
この先端部を被測定物の表面に密着させるセンサヘッド
と、
前記投光ファイバに前記被測定物の内部に注入する白色
光を導入する発光装置と、
可視光域の異なる波長に感度のピークを持つ少なくとも
２個の光電素子を内蔵し、前記被測定物の表層部で拡散
反射した散乱着色光が前記受光ファイバを介して導入さ
れる受光素子と、この受光素子の出力の比に基づいて前
記被測定物の色を測定する演算装置
を具備することを特徴とする．
《作用》
本発明の請求項ｌにかかる色の測定方法及び請求項２に
かかる色の測定装置では、センサヘッドの先端部が被測
定物の表面に密着させるので、投光ファイバから被測定
物に照射された白色光のうち被測定物の表面で鏡面反射
する鏡面反射光は、直接投光ファイバに進入して受光フ
ァイバには進入しない．一方、白色光のうち被測定物の
表層部分で拡散反射した光は、表層部分により着色され
て着色光となり、被測定物の表面を透過し更に受光ファ
イバを介して受光素子に導かれるため、表面の形状や付
着物の影響を受けていない被測定物そのものの色をより
正確に測定できる．
《実施例》
以下、本発明にかかる色の測定方法及び装置の実施例に
ついて図面を参照にして説明する．第１図は、本発明の
請求項（２》の実施例にかかる測定装置を示している．
測定装置ｌＯは、被測定物としての植物の粟Ａの表目に
密着させるセンサヘッド２０と、センサヘッド２０から
延びる光ファイバ３０と、光ファイバ３０に対して白色
光を注入する発光装置４０と、光ファイバ３０からの着
色光を光電変検する受光装置５０と、受光装置５０から
の出力に基づいて着色光の色を演算算出する演算測定装
＠６ｏとを備えている．センサヘッド２０は、第２図に
示すように筒型の筺体２ｌを備え、筐体２１内に光ファ
イバ３０が挿通されている．筺体２１の先端部には、光
ファイバ３０の先端部を保持する小筒部２２が形成され
ている．小筒部２２の先端開口部に光ファイバ３０の投
光ファイバ３１と受光ファイバ３２とが臨んでいる．光
ファイバ３０は、上述のように投光ファイバ３ｌと受光
ファイバ３２とで構成されている．投光ファイバ３ｌは
、第３図に示すように、細径ファイバ３１ａ，，，，，
と細径ファイバ３１ａ． ． ， ，を円形状に束ねる
不透光性のチューブ３ｌｂとで構成されている．本実施
例では、細径ファイバ３１ａの直径は０．２ｍｍとされ
ており、細径ファイバ３１ａは１６本設けられている．
受光ファイバ３２は、直径ｌ膳一の一本のファイバ３２
ａと、このファイバ３２ａの周囲を光を通さないように
囲むチューブ３２ｂとで構成されている．センサヘッド
２０内では受光ファイバ３２の周囲に投光ファイバ３１
の細径ファイバ３１ａ， ， ，が配設されている．投
光ファイバ３ｌの基端部ほ、発光装ｉｔ４０の筺体４１
内に延在しており、ハロゲンランプ４２に臨んでいる．
受光ファイバ３２の基端部は、受光装Ｗ１５０の筐体５
１内に延在しており、受光装５１５０の受光素子５２に
臨んでいる．
発光装置４０は、第１図に示すように、筺体４１と光源
としてのハロゲンランブ５２と、図示しない電源回路と
で構成され、電源回路からハロゲンランプ５２に対して
電力供給されると、ハロゲンランプ５２が点灯して白色
光が投光ファイバ３１の細径ファイバ３１１１＋＋．＋
に注入されるようになっている．受光装置５０は、第４
図に示すように、不透光性のシールドフイルム５１と、
受光ファイバ３２からの着色光を光電変換する受光素子
５２と、受光ファイバ３２の終末端を保持して受光索子
５２に臨ませる筒型のホルダー５３とを備えている．シ
ールドフイルム５１の一端部には、受光ファイバ３２を
引き抜き不能に保持する小筒部５１が形成されている．
シールドフィルム５ｌの中間部は大径岡部５ｌｂとされ
ている．この太径筒部５ｌｂ内部には、シールドフイル
ム５１を筒状に保持するカラー５１ｃが内蔵され、この
カラー５１ｃ内には受光索子５２の０１４ ｍ ５ ２
ａが装着されている．シールドフィルム５１の他端部
には、円随台形状の筒部５１ｄが形成され、この筒部５
１ｄ部受光素子５２の端子５２ｂ，５２ｃ，５２ｄを固
定する保持筒５４が装着されている．保持筒５４は光を
通さない材質で構成されている．受光索子５２は、５５
０ｎ一とｆ５２０ｎｍの波長光に感度のピークがある２
個のフォトダイオードを１チップ化したもので、受光素
子５ｌの端子５２ｂは５５０ｎ■に感度のピークを持つ
フォトダイオードの光電電流を出力する端子である．又
、端子６２ｃは、６２０ｎａ＋に感度のピークを持つフ
ォトダイオードの光電電流を出力する端子である．端子
５２ｄはアースである．演算測定装１１６０は、受光索
子５２の端子５２ｂ，５２ｃからの出力電流をアナログ
演算して受光索子５２が検出した着色光の平均波長を算
出するアナログ演算器６ｌとアナログ演算器６ｌの演算
結果に基づいてその測定値を表示する電圧計６２とで構
成されている．本実施例では、アナログ演算＠６１とし
て、受光索子５２から出力された２組の電流の比をアナ
ログ演算（光の平均波長を求め）し、その結果を電圧と
して出力するアナログ電子回路を設けたが、２組の電流
を個別に測定し、後でコンピュータなどでその比を演算
する方法でも良い．又、測定値を表示する装置として電
圧計６２を設けたが、＾／Ｄ変換装置を備えたコンピュ
ータ等でも良い．
次に本発明の請求項（１）の実施例にかかる色の測定方
法を上述の測定装置１０を用いて説明する．第５図は、
この測定方法の実施例を示したもので、被測定物として
の植物の葉Ａの表面＾１に、センサヘッド２０先端部か
ら延びる光ファイバ３０の先端面を密着させる．葉Ａの
表面Ａ＋に光ファイバ３０の先端面を密着させた状態で
ハロゲンランプ４２を点灯させると、投稿ファイバ３１
の細径ファイバ３２ａ，，，，，を介して白色光が菓Ａ
の表面ＡＩに照射される．葉Ａの表面Ａ重に照射された
白色光の一部は鏡面反射光Ｌ１として再び投光ファイバ
３ｌを介して発光装ｉｌ！４０に戻る． ＭＡの表ｆ
ＩＡ＋に照射された白色光の一部は葉Ａの表層部Ａ２に
進入して散乱し、表層部Ａ２で着色されて肴色光Ｌ２と
なり、受光ファイバ３２に入射する．受光ファイバ３２
に入射した着色光Ｌｔは受光装置５０の受光素子５２に
受光され、光電変換される．受光索子５２では５５０ｎ
一と６２ｏｎ一の波長光に感度のピークを持つ２組の電
流出力があるので、その比を演算算出し、この算出結果
を電圧計６２に表示させると、粟Ａの色が測定される．
（発明の効果）
本発明は、以上説明した構成から明らかなように、例え
ば植物の粟等のような被測定物の生育過程で生ずる大き
な色の変化を連続測定することが出来ると共に、受光素
子で色を検知するので、僅かな色の変化をより正確に測
定することが出来る．従って、植物等の生育過程に於け
る変化を正確に把握できるという効果を奏する．DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a color measuring device for measuring, for example, changes in the color of rapeseed, such as plants. (Background of the invention and problems to be solved by the invention) Generally, when measuring changes in the color of an object to be measured such as a plant, white light is irradiated onto the surface of millet of the plant, and the light reflected from the surface is used to However, since the surface of a plant's rape has a variety of shapes and is covered with various secretions from living organisms, the conventional method of measuring the color of light reflected from the surface cannot accurately measure the color of the rape itself. It is difficult to measure the color of The present invention has been made in view of this problem, and it is an object of the present invention to provide a color measuring method and apparatus that can more accurately measure the color of the surface layer of an object to be measured. (Means for Solving HM) In order to solve the above problem, the color measuring method according to claim 1 of the present invention includes: A method for measuring the color of an object to be measured into which light can penetrate. The tip of the sensor head is closely attached to the surface of the object to be measured. Injecting white light into the object to be measured from the light emitting fiber, and receiving colored light when the white light is diffusely reflected on the surface layer of the object to be measured, by the light receiving fiber; The colored light introduced into the light is guided to a light-receiving element containing at least two photoelectric conversion elements that have sensitivity peaks at different wavelengths in the visible light range, and the output of this light-receiving element is The method is characterized in that the color of the surface layer of the object to be measured is measured based on Further, in the color measuring device according to claim 2 of the present invention, the cross-sectional configuration of the tip portion is such that a light receiving fiber is disposed at an offset center and a light emitting fiber for irradiating light to the epidermis side is disposed. It is said that
A sensor head that brings this tip into close contact with the surface of the object to be measured, a light emitting device that introduces white light into the light projecting fiber to be injected into the object to be measured, and a sensor head that has sensitivity peaks at different wavelengths in the visible light range. The light-receiving element includes at least two photoelectric elements having a built-in photoelectric element, and the scattered colored light diffusely reflected on the surface layer of the object to be measured is introduced via the light-receiving fiber, and the It is characterized by being equipped with a calculation device that measures the color of the object to be measured. <<Operation>> In the color measuring method according to claim 1 and the color measuring apparatus according to claim 2 of the present invention, the tip of the sensor head is brought into close contact with the surface of the object to be measured, so that the light emitting fiber can be connected to the object to be measured. Among the white light irradiated on the object, the specularly reflected light that is specularly reflected on the surface of the object to be measured directly enters the transmitting fiber and does not enter the receiving fiber. On the other hand, the white light that is diffusely reflected by the surface layer of the object to be measured is colored by the surface layer and becomes colored light, which is transmitted through the surface of the object to be measured and further guided to the light-receiving element via the light-receiving fiber. It is possible to more accurately measure the color of the object itself, which is not affected by the surface shape or deposits. <<Example>> Hereinafter, an example of the color measuring method and apparatus according to the present invention will be described with reference to the drawings. FIG. 1 shows a measuring device according to an embodiment of claim (2) of the present invention. The measuring device IO includes a sensor head 20 that is brought into close contact with the surface of millet A of a plant as an object to be measured, An optical fiber 30 extending from the sensor head 20, a light emitting device 40 that injects white light into the optical fiber 30, a light receiving device 50 that photoelectrically converts the colored light from the optical fiber 30, and an output from the light receiving device 50. The sensor head 20 has a cylindrical housing 2l as shown in FIG. 2, and an optical fiber 30 is installed in the housing 21. A small cylindrical part 22 that holds the distal end of the optical fiber 30 is formed at the distal end of the housing 21.The light emitting fiber 31 of the optical fiber 30 is inserted into the distal opening of the small cylindrical part 22. As described above, the optical fiber 30 is composed of the light emitting fiber 3l and the light receiving fiber 32.The light emitting fiber 3l is a small diameter fiber as shown in FIG. 31a,,,,,
and small diameter fiber 31a. ．． It consists of a 3 lb. opaque tube that bundles , , into a circular shape. In this embodiment, the diameter of the small diameter fiber 31a is 0.2 mm, and 16 small diameter fibers 31a are provided.
The receiving fiber 32 is a single fiber 32 with a diameter of l.
a, and a tube 32b that surrounds the fiber 32a so as not to transmit light. Inside the sensor head 20, a light emitting fiber 31 is arranged around the light receiving fiber 32.
Small diameter fibers 31a, , , are arranged. The base end of the light emitting fiber 3l is connected to the housing 41 of the light emitting device it40.
It extends inside and faces the halogen lamp 42.
The base end of the light receiving fiber 32 is connected to the housing 5 of the light receiving device W150.
1 and faces the light receiving element 52 of the light receiving device 5150. As shown in FIG. 1, the light emitting device 40 is composed of a housing 41, a halogen lamp 52 as a light source, and a power supply circuit (not shown). When power is supplied from the power supply circuit to the halogen lamp 52, the halogen lamp 52 lights up and white light is emitted from the small diameter fiber 3111++. +
It is designed to be injected into The light receiving device 50 is a fourth
As shown in the figure, an opaque shield film 51,
It includes a light receiving element 52 that photoelectrically converts colored light from the light receiving fiber 32, and a cylindrical holder 53 that holds the terminal end of the light receiving fiber 32 and makes it face the light receiving cable 52. A small cylindrical portion 51 is formed at one end of the shield film 51 to hold the light receiving fiber 32 so that it cannot be pulled out.
The middle part of the shield film 5L has a large diameter 5lb. A collar 51c for holding the shield film 51 in a cylindrical shape is built into the large-diameter cylindrical portion 5lb, and a 014 m 5 2 of the light-receiving cable 52 is contained within this collar 51c.
A is attached. A trapezoidal cylindrical portion 51d is formed at the other end of the shield film 51, and this cylindrical portion 5
A holding tube 54 for fixing the terminals 52b, 52c, and 52d of the 1d portion light receiving element 52 is attached. The holding cylinder 54 is made of a material that does not transmit light. The light receiving cable 52 is 55
There is a sensitivity peak at wavelength light of 0n1 and f520nm2.
The terminal 52b of the light receiving element 5l is a terminal that outputs the photoelectric current of the photodiode, which has a sensitivity peak at 550 nm. Further, the terminal 62c is a terminal for outputting a photoelectric current of a photodiode having a sensitivity peak at 620 na+. Terminal 52d is grounded. The calculation and measurement device 1160 performs analog calculations on the output currents from the terminals 52b and 52c of the light receiving probe 52 to calculate the average wavelength of the colored light detected by the light receiving probe 52, and an analog computing device 6l. It consists of a voltmeter 62 that displays the measured value based on the result. In this embodiment, as analog calculation @61, an analog electronic circuit is provided which performs analog calculation (calculates the average wavelength of light) on the ratio of two sets of currents output from the light receiving probe 52 and outputs the result as a voltage. However, it is also possible to measure the two sets of currents individually and calculate the ratio later using a computer or the like. Further, although a voltmeter 62 is provided as a device for displaying measured values, a computer or the like equipped with a ^/D conversion device may also be used. Next, a color measuring method according to an embodiment of claim (1) of the present invention will be explained using the above-mentioned measuring device 10. Figure 5 shows
This is an example of this measurement method, in which the tip surface of an optical fiber 30 extending from the tip of the sensor head 20 is brought into close contact with the surface ^1 of a leaf A of a plant as an object to be measured. When the halogen lamp 42 is turned on with the tip end of the optical fiber 30 in close contact with the surface A+ of the leaf A, the posted fiber 31
The white light is transmitted to A through the small diameter fibers 32a, , , .
The surface AI is irradiated. A part of the white light irradiated onto the surface A of the leaf A is transmitted to the light emitting device il again via the light projection fiber 3l as specularly reflected light L1! Return to 40. MA table f
A part of the white light irradiated to IA+ enters the surface layer A2 of the leaf A, is scattered, is colored in the surface layer A2, becomes dark-colored light L2, and enters the light-receiving fiber 32. Receiving fiber 32
The incident colored light Lt is received by the light receiving element 52 of the light receiving device 50 and photoelectrically converted. 550n for light receiving cable 52
There are two sets of current outputs that have sensitivity peaks at wavelengths of 1 and 62 on, so when the ratio is calculated and the calculation result is displayed on the voltmeter 62, the color of millet A is measured. (Effects of the Invention) As is clear from the configuration described above, the present invention is capable of continuously measuring large color changes that occur during the growth process of an object to be measured, such as plant millet, and Because it detects color, it is possible to more accurately measure slight color changes. Therefore, it is possible to accurately grasp changes in the growth process of plants, etc.
第１図は本発明の請求項（２）にかかる測定装置の実施
例を示す説明図
第２図は第１図の測定装置のセンサヘッドの拡大図第３
図は第１図の光ファイバの断面図
第４図は第１図の受光装置の構成図
第６図は本発明の請求項（２）の実施例を示す説明図で
ある．FIG. 1 is an explanatory diagram showing an embodiment of the measuring device according to claim (2) of the present invention. FIG. 2 is an enlarged view of the sensor head of the measuring device shown in FIG. 1.
1. The figure is a cross-sectional view of the optical fiber shown in FIG. 1. FIG. 4 is a configuration diagram of the light receiving device shown in FIG. 1. FIG. 6 is an explanatory diagram showing an embodiment of claim (2) of the present invention.
Claims (2)
おいて、 先端部の断面構成が芯側に受光ファイバを有しこの受光
ファイバを取り囲む表皮側に光を照射する投光ファイバ
を配設する構成とされているセンサヘッドの先端部を前
記被測定物の表面に密着させ、 前記投光ファイバから前記被測定物の内部に白色光を注
入すると共に、この白色光が前記被測定物の表層部にお
いて拡散反射するときの着色光を前記受光ファイバによ
って受光し、 前記受光ファイバに導入された着色光を、可視光域の異
なる波長に感度のピークを持つ、少なくとも２個の光電
変換素子を内蔵した受光素子に導き、 この受光素子の出力の比に基づいて前 記被測定物の表層部分の色を測定することを特徴とする
色の測定方法。(1) In a method for measuring the color of an object to be measured through which light can penetrate, the cross-sectional configuration of the tip is a light-emitting fiber that has a light-receiving fiber on the core side and irradiates light to the outer skin side surrounding the light-receiving fiber. The distal end of the sensor head configured to be disposed is brought into close contact with the surface of the object to be measured, white light is injected into the object to be measured from the light emitting fiber, and this white light is transmitted to the object to be measured. Colored light that is diffusely reflected on the surface of an object is received by the light-receiving fiber, and the colored light introduced into the light-receiving fiber is converted into at least two photoelectric converters having sensitivity peaks at different wavelengths in the visible light region. A method for measuring color, characterized in that the color of the surface layer of the object to be measured is measured based on the ratio of the outputs of the light receiving element.
され表皮側に光を照射する投光ファイバが配設される構
成とされ、この先端部を被測定物の表面に密着させるセ
ンサヘッドと、 前記投光ファイバに前記被測定物の内部に注入する白色
光を導入する発光装置と、 可視光域の異なる波長に感度のピークを持つ少なくとも
２個の光電素子を内蔵し、前記被測定物の表層部で拡散
反射した散乱着色光が前記受光ファイバを介して導入さ
れる受光素子と、 この受光素子の出力の比に基づいて前記被測定物の色を
測定する演算装置 を具備することを特徴とする色の測定装置。(2) The cross-sectional configuration of the tip is such that the light-receiving fiber is placed on the core side and the light-emitting fiber that irradiates light on the epidermis side, and this tip is brought into close contact with the surface of the object to be measured. a sensor head; a light emitting device for introducing white light into the object to be measured into the light emitting fiber; and at least two photoelectric elements having sensitivity peaks at different wavelengths in the visible light range; A light-receiving element into which scattered colored light diffusely reflected by the surface layer of the object to be measured is introduced through the light-receiving fiber, and a calculation device that measures the color of the object to be measured based on a ratio of outputs of the light-receiving element. A color measuring device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5738089A JPH02236127A (en) | 1989-03-09 | 1989-03-09 | Method and apparatus for measuring color |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5738089A JPH02236127A (en) | 1989-03-09 | 1989-03-09 | Method and apparatus for measuring color |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02236127A true JPH02236127A (en) | 1990-09-19 |
Family
ID=13053998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5738089A Pending JPH02236127A (en) | 1989-03-09 | 1989-03-09 | Method and apparatus for measuring color |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02236127A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8998613B2 (en) | 1997-01-02 | 2015-04-07 | 511 Innovations Inc. | Apparatus and method for measuring optical characteristics using a camera and a calibration chart imaged with the camera |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61292043A (en) * | 1985-06-19 | 1986-12-22 | Anritsu Corp | Photodetecting probe for spectocolorimeter |
-
1989
- 1989-03-09 JP JP5738089A patent/JPH02236127A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61292043A (en) * | 1985-06-19 | 1986-12-22 | Anritsu Corp | Photodetecting probe for spectocolorimeter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8998613B2 (en) | 1997-01-02 | 2015-04-07 | 511 Innovations Inc. | Apparatus and method for measuring optical characteristics using a camera and a calibration chart imaged with the camera |
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