WO2015198401A1 - Method for setting inspection condition for fastener element, and method for inspecting fastener element - Google Patents
Method for setting inspection condition for fastener element, and method for inspecting fastener element Download PDFInfo
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- WO2015198401A1 WO2015198401A1 PCT/JP2014/066732 JP2014066732W WO2015198401A1 WO 2015198401 A1 WO2015198401 A1 WO 2015198401A1 JP 2014066732 W JP2014066732 W JP 2014066732W WO 2015198401 A1 WO2015198401 A1 WO 2015198401A1
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- 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
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
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- This invention relates to a fastener element inspection condition setting method and a fastener element inspection method for evaluating the quality of a product by detecting the color of the surface of a fastener element of a slide fastener.
- Patent Document 1 an inspection method as disclosed in Patent Document 1 has been proposed as a technique for measuring the surface of a product in a metal product, converting the color state into a numerical value, and quantitatively evaluating it.
- the inspection method disclosed in Patent Literature 1 divides a captured image of a surface of a metal material such as a steel material into predetermined areas and each color of red (R), green (G), and blue (B), which are the three primary colors of light. Information is acquired, the acquired information is digitized, a non-corrosive surface is extracted from the surface of the metal material in comparison with the information acquired in advance, and the numerical range of the color mixture amount ratio of the non-corrosive surface is calculated.
- the corroded portion of each divided surface is extracted, the area ratio of the extracted corroded portion is calculated with respect to the imaged metal surface area, and the deterioration degree of the metal surface is calculated based on the area ratio of the corroded portion. Evaluating.
- the process of extracting the non-corrosion surface is performed in the first stage and the first stage of extracting the non-corrosion surface by comparing the digitized data of each divided surface with the digitized data of the corroded surface acquired in advance.
- the non-corroded surface digitized data is evaluated based on the Mahalanobis distance as a criterion, and a second step of determining a surface having a predetermined Mahalanobis distance as a non-corroded surface is provided.
- Patent Documents 2 and 3 also propose an inspection device that obtains information on the three primary colors of light on the surface of a metal material such as steel, and discriminates between non-defective products and defective products based on the ratio of the values of each color component. Has been.
- Patent Document 4 discloses a method of identifying a rust color region by converting a RGB color system to an L * a * b * color system and extracting pixels having a predetermined value. Further, in Patent Document 5, an RGB signal is obtained by color photographing the surface to be inspected, and the RGB signal is converted into a uniform color space signal of the L * a * b * color system by a signal conversion unit.
- a surface inspection apparatus for obtaining a colored image and detecting a colored wrinkle on the surface based on the obtained image is disclosed.
- JP 2007-256050 A JP 2003-216930 A JP 2012-149944 A JP 2005-291984 A JP 2005-233826 A
- Patent Documents 1-5 the surface of a large material such as a steel material integrally formed of the same kind of material is photographed, and the image is processed. A sufficient amount of image information can be obtained relatively easily for the inspection object.
- the present invention has been made in view of the above-described background art, and provides a fastener element inspection condition setting method and a fastener element inspection method capable of accurately and stably evaluating the quality of a fastener element of a slide fastener.
- the purpose is to provide.
- the present invention relates to the quality of the surface of the fastener element based on an image obtained by photographing the fastener element using a camera that photographs the surface of the fastener element of the slide fastener and an illumination device that illuminates the fastener element.
- a fastener element inspection condition setting method for determining a plurality of control factors that affect an image captured by the camera, and setting a plurality of predetermined conditions for each control factor, For each of the fasteners, a photographing step of simultaneously photographing the plurality of fastener elements of the slide fastener under the plurality of conditions of the factor, and a plurality of color images obtained by photographing the plurality of fastener elements obtained by the camera.
- Image extraction process to extract color image data in individual unit area for each element
- a luminance value calculating step for obtaining a luminance value for each of the three primary colors of light for each pixel of the color image data in the unit area of each fastener element, and 3 of the light calculated in the luminance value calculating step.
- An error pressure calculating step for calculating an error pressure of the color of the fastener element based on the luminance value for each primary color, and each fastener element for each setting condition of each control factor based on the error pressure obtained.
- a fastener element inspection comprising: a control factor selection step of calculating an SN ratio and sensitivity of a color of the color and selecting a setting condition of the control factor having a relatively large value from the calculated SN ratio and sensitivity This is a condition setting method.
- the luminance value for each of the three primary colors of light for each pixel of the color image data is calculated.
- the error value is calculated by obtaining a characteristic value that is a ratio to the average value.
- the color of the surface of the fastener element is obtained based on an image obtained by photographing the fastener element using a camera that photographs the surface of the fastener element of the slide fastener and an illumination device that illuminates the fastener element.
- a fastener element inspection method for determining pass / fail wherein a plurality of control factors that affect an image captured by the camera are selected, optimal conditions for inspection are set for each control factor, and An imaging step of simultaneously photographing the plurality of fastener elements of the slide fastener under the plurality of conditions, and a color image obtained by photographing the plurality of fastener elements obtained by the camera, for each fastener element.
- a fastener element inspection method comprising: a determination step of determining whether the color of the surface of the fastener element is good by comparing a value relating to the color of the fastener element calculated based on the value with a predetermined threshold value.
- the determination step calculates an error pressure of the color of the fastener element based on the luminance value for each of the three primary colors of light calculated in the luminance value calculation step, and based on the obtained error pressure, The color of the surface of the fastener element is determined.
- the optimum condition for each control factor in the imaging step is selected and set in the control factor selection step by the fastener element inspection condition setting method.
- the quality of the slide fastener element color can be automatically and quickly determined accurately, and stable and good quality control can be achieved. It can be carried out.
- the inspection device 10 used in the fastener element inspection condition setting method and fastener element inspection method of the slide fastener according to this embodiment includes an image sensor such as a CCD or C-MOS as shown in FIG.
- a slide fastener 20 is held by a jig 18 disposed on the stage 16 on the side opposite to the camera 12 with the illumination device 14 interposed therebetween.
- the jig 18 includes a pair of holding portions 19 that sandwich the fastener tapes 22 on both sides of the slide fastener 20, and the element 24 of the slide fastener 20 is positioned between the holding portions 19.
- the slide fastener 20 to be inspected here is a long string-like member formed as a slide fastener chain in the previous stage to be cut for each individual slide fastener 20, and is intermittently fed on the jig 18. Thus, the element 24 is photographed by the photographing method described later.
- an inspection device 30 including the ring illumination device 32 shown in FIG. prepare.
- the light emitting surface of the illumination device 32 is orthogonal to the optical axis of the camera 12, and the center of the ring of the illumination device 32 is located concentrically with the optical axis of the camera 12.
- the images taken by the inspection apparatuses 10 and 30 under various conditions are a plurality of elements 24 of the slide fastener 20 positioned in the center. Shooting is performed so that the element 24 is included.
- the photographed image data is processed by a method to be described later, and the color and state of the surface of the element 24 are evaluated to determine pass / fail.
- an inspection condition setting method for determining the fastener element inspection method of this embodiment will be described below.
- a plurality of control factors that affect the image captured by the camera 12 are selected, a plurality of predetermined conditions are set for each control factor, and a plurality of slide fasteners 20 are respectively set according to a plurality of conditions of each control factor.
- the image is taken in a range including the fastener element 24.
- control factors which are inspection conditions are shown in Table 1.
- the eight types of control factors are the basic elements of imaging: camera type (F), illumination type (C), shutter speed (A), illumination intensity (D), and camera angle. (G) and the like.
- the number of measurement elements (B) is added in order to see the change in stability due to the increase or decrease in the number of elements to be measured within the specified range, and it is larger than the fastener element 24 in order to see the influence of the background color that is an error factor.
- the LED idling time (H) is added.
- condition N1 with ambient light and background color J1 and condition N2 without ambient light and background color: J2 were set to allow easy error.
- Photographers are taken under the conditions of each level with these control factors and error factors, and the required number of photographic data is acquired.
- the acquired photographing data does not require the respective photographing data under all the conditions in Tables 1 and 2 for each element 24.
- the unit area is a range of a selected dimension among the three types of areas larger, equal, and smaller than the fastener element 24 according to the measurement area dimension setting of the control factor described above.
- the luminance value for each of the three primary colors of light for each pixel of the color image data in the unit area of each fastener element 24 is obtained. Further, with respect to the image data for each pixel in the unit area of each fastener element 24 of the image photographed by the camera 12, the characteristic value y kn (k is a sample number, obtained from the luminance value of each pixel for each RGB). Is the feature value No. of the sample). Based on this characteristic value, the error pressure of each sample is calculated by the following equations (1) to (7). The erroneous pressure may be obtained for each slide fastener 20 or for each fixed length of the fastener tape 22.
- the erroneous pressure value of the luminance value of the slide fastener element 24 is obtained for each sample based on the equation (7).
- the obtained error pressures are D (1) to D (k)
- the discoloration processing amounts X 1 to X k of the element 24 of the slide fastener 20 of each sample are set for the error factors N1 and N2 of the measurement environment.
- an erroneous pressure was obtained for each slide fastener 20.
- the discoloration processing amount is a value obtained by stepwise discoloration of the surface of the fastener element 24 in advance in order to set the inspection condition of the fastener element 24. It is a thing. This sample takes data for setting inspection conditions before actual inspection, and is used for a verification experiment described later. Table 3 shows the correspondence between the amount of color change processing and the erroneous pressure obtained in this way.
- the error pressure is calculated as described above from the luminance value for each RGB obtained from the photographed image for the above eight types of control factors, and further based on formulas (17) and (18). Then, the SN ratio and sensitivity are calculated, and the optimum condition of the control factor is selected from these values.
- the optimum conditions for each control factor selected from the S / N ratio and sensitivity are selected from the values of S / N ratio and sensitivity as shown in the experimental results shown in FIGS. 4 and 5 described later. The factors shown in FIGS. Select based on effect chart.
- the circles and circles shown in the factor and effect diagrams of FIGS. 4 and 5 indicate combinations of optimum conditions that increase the S / N ratio and sensitivity ( ⁇ ), and combinations of worst conditions that cause a relatively low S / N ratio and sensitivity ( ⁇ ). It shows with.
- the setting condition indicated by a circle is set as the optimum condition for product inspection.
- the dome type illumination shown in FIG. 1 is more preferable than the ring type illumination device shown in FIG. 2 in terms of sensitivity, and the measurement area size is equal to the fastener element 24 in this embodiment.
- good results were obtained for the SN ratio.
- the conditions for obtaining good results are obtained from the SN ratio and sensitivity.
- the level of each control factor is set to the selected optimal condition.
- the fastener element 24 is photographed.
- color image data in each unit area for each fastener element 24 is extracted from the obtained color image of the plurality of fastener elements 24, and each color image data in the unit area of each fastener element 24 is extracted.
- Luminance values for the three primary colors of light for each pixel are obtained, and based on the calculated luminance values for the three primary colors of light, the color error pressure of the fastener element 24 is calculated by the same calculation process as described above. Then, based on the obtained error pressure, whether the color of the surface of the fastener element 24 is good or not is determined based on whether the error pressure is a certain value or less.
- the determination may be performed by performing color evaluation from other color evaluation, for example, a value of the L * a * b * color system, under the measurement conditions based on the optimum control factor without calculating the erroneous pressure.
- the quality of the fastener element 24 of the slide fastener 20 can be objectively and quantitatively determined, and automatically and quickly.
- the quality of the surface color can be determined, and good quality control can be performed stably.
- the fastener element inspection condition setting method and fastener element inspection method of the present invention are not limited to the above-described embodiment, and control factors and error factors can be set as appropriate, and the number of factors can be selected as appropriate. It is a thing.
- Table 5 shows the optimum conditions calculated based on the S / N ratio and sensitivity obtained in the L18 orthogonal table experiment used in the present invention, the worst-case S / N ratio and the estimated value and gain of the sensitivity, and the confirmation experiment. The result and gain of the signal to noise ratio and sensitivity are shown.
- the gain obtained in the confirmation experiment was about 3 [db] lower in the S / N ratio than the estimated value, and the sensitivity was about 40 higher. However, the same tendency was shown, and the validity and reproducibility of the factor diagram were improved. I was able to confirm.
Abstract
The present invention has a camera (12) for capturing an image of the surface of a fastener element (24) of a slide fastener (20), and an illumination device (14) for illuminating the fastener element (24). A plurality of control factors which affect the image captured by the camera (12) are selected, and an image of each of a plurality of fastener elements (24) is captured simultaneously in a plurality of conditions of the control factors. Color image data in an individual unit region of each of the fastener elements (24) are extracted for a plurality of color images captured of the plurality of fastener elements (24) by the camera (12). Luminance characteristic values for each of the three primary colors of light are obtained for each pixel of the color image data of the unit regions of the fastener elements (24). An error variance in the color of a fastener element (24) is calculated on the basis of the computed characteristic values for the three primary colors of light. The SN ratio and sensitivity of the image data of each fastener element (24) is computed for each set condition of the control factors on the basis of the obtained error variance, and the set condition of a control factor for which the SN ratio and sensitivity values are relatively large is selected from among the computed SN ratios and sensitivities.
Description
この発明は、スライドファスナのファスナエレメントの表面の色を検知して、製品の良否を評価するためのファスナエレメントの検査条件設定方法とファスナエレメント検査方法に関する。
This invention relates to a fastener element inspection condition setting method and a fastener element inspection method for evaluating the quality of a product by detecting the color of the surface of a fastener element of a slide fastener.
従来、スライドファスナのファスナエレメントの色に関する品質管理は、検査対象となるファスナエレメントが相対的に小さく多数となり、表面の微妙な凹凸による僅かな色の誤差があることから自動化が難しく、人の目視によって行われている。しかしながら、目視による検査は、同じエレメント材料であっても検査する人によって色のとらえ方が異なり、感覚的な判断になることから、良否の判別基準が一定にならないものであった。
Conventionally, the quality control for the color of fastener elements of slide fasteners is difficult to automate because the fastener elements to be inspected are relatively small and many, and there are slight color errors due to subtle irregularities on the surface. Has been done by. However, in the visual inspection, even if the same element material is used, the color perception varies depending on the person inspecting, and it becomes a sensory judgment.
一方、金属製品において製品表面の測色を行い、色の状態を数値化して、定量的に評価する技術として、特許文献１に開示されているような検査方法が提案されている。特許文献１に開示された検査方法は、鋼材等の金属材料表面の撮像画像を所定の面積毎に分割して光の３原色である赤（Ｒ）緑（Ｇ）青（Ｂ）の各色彩情報取得し、取得した情報を数値化し、あらかじめ取得しておいた情報と比較して金属材料表面から非腐食面を抽出し、非腐食面の混色量比の数値範囲を算出している。そして、分割された各面の腐食部を抽出し、撮像された金属表面積に対して、抽出された腐食部の面積比率を算出し、腐食部の面積比率をもとに金属表面の劣化度を評価している。非腐食面を抽出する工程は、分割された各面の数値化データを、予め取得した腐食面の数値化データと比較することによって非腐食面を抽出する第１段階と、第１段階で抽出された非腐食面の数値化データについてマハラノビス距離を判定基準にした評価を行い、所定のマハラノビス距離を有する面を非腐食面と決定する第２段階とを備えるものである。
On the other hand, an inspection method as disclosed in Patent Document 1 has been proposed as a technique for measuring the surface of a product in a metal product, converting the color state into a numerical value, and quantitatively evaluating it. The inspection method disclosed in Patent Literature 1 divides a captured image of a surface of a metal material such as a steel material into predetermined areas and each color of red (R), green (G), and blue (B), which are the three primary colors of light. Information is acquired, the acquired information is digitized, a non-corrosive surface is extracted from the surface of the metal material in comparison with the information acquired in advance, and the numerical range of the color mixture amount ratio of the non-corrosive surface is calculated. Then, the corroded portion of each divided surface is extracted, the area ratio of the extracted corroded portion is calculated with respect to the imaged metal surface area, and the deterioration degree of the metal surface is calculated based on the area ratio of the corroded portion. Evaluating. The process of extracting the non-corrosion surface is performed in the first stage and the first stage of extracting the non-corrosion surface by comparing the digitized data of each divided surface with the digitized data of the corroded surface acquired in advance. The non-corroded surface digitized data is evaluated based on the Mahalanobis distance as a criterion, and a second step of determining a surface having a predetermined Mahalanobis distance as a non-corroded surface is provided.
同様に、特許文献２，３には、鋼材等の金属材料表面の光の３原色の情報を取得し、その各色成分の値の比を基に、良品と不良品を判別する検査装置も提案されている。
Similarly, Patent Documents 2 and 3 also propose an inspection device that obtains information on the three primary colors of light on the surface of a metal material such as steel, and discriminates between non-defective products and defective products based on the ratio of the values of each color component. Has been.
その他、特許文献４には、ＲＧＢ表色系からＬ*ａ*ｂ*表色系に変換して、所定の値の画素を抽出することにより、錆色領域を特定する方法が開示されている。また、特許文献５には、検査対象の表面をカラー撮影してＲＧＢ信号を得、信号変換部によりＲＧＢ信号をＬ*ａ*ｂ*表色系の均等色空間信号に変換し、得られた検査画像の各画素について、疵検出部により、均等色空間の色域(色相又は彩度)を分割した分割領域の成分を含むか否かで、分割領域の色相又は彩度に対応した２値化画像を得、これに基づいて表面の有色疵を検出する表面検査装置が開示されている。
In addition, Patent Document 4 discloses a method of identifying a rust color region by converting a RGB color system to an L * a * b * color system and extracting pixels having a predetermined value. Further, in Patent Document 5, an RGB signal is obtained by color photographing the surface to be inspected, and the RGB signal is converted into a uniform color space signal of the L * a * b * color system by a signal conversion unit. For each pixel of the inspection image, a binary corresponding to the hue or saturation of the divided region depending on whether or not it includes a component of the divided region obtained by dividing the color gamut (hue or saturation) of the uniform color space by the wrinkle detection unit A surface inspection apparatus for obtaining a colored image and detecting a colored wrinkle on the surface based on the obtained image is disclosed.
特許文献１－５に開示された表面検査方法は、同種の材料で一体に形成された鋼材等の大きな材料の表面を撮影して、その画像を処理するものであり、撮影画像全体が検査対象の表面の画像であり、検査対象について、比較的容易に十分な量の画像情報を得ることができるものである。
In the surface inspection method disclosed in Patent Documents 1-5, the surface of a large material such as a steel material integrally formed of the same kind of material is photographed, and the image is processed. A sufficient amount of image information can be obtained relatively easily for the inspection object.
しかしながら、スライドファスナのファスナエレメントのように微小な検査対象が異なる種類の材料に取り付けられているものの場合、求めたい部材の情報の面積自体が小さく、ファスナテープ等の他部材に対して正確なマスキング処理をしないと、撮影画像中にファスナエレメント以外のファスナテープ等の他部材の情報が含まれてしまい、正確な評価を行うことが難しいものであった。さらに、ファスナエレメントが細かく数が多いものであり、正確なマスキングも難しいものであった。
However, when a small inspection object is attached to a different kind of material, such as a fastener element of a slide fastener, the area of the information of the member to be obtained is small, and accurate masking for other members such as fastener tape is performed. If the processing is not performed, information on other members such as fastener tapes other than the fastener element is included in the photographed image, and it is difficult to perform accurate evaluation. Furthermore, the fastener elements are fine and numerous, and accurate masking is difficult.
しかも、光源やカメラの種類、取得画像の範囲の取り方によっても、判断に影響することから、ファスナエレメントの表面の正確で安定した評価を行うことが難しいものであった。従って、スライドファスナのファスナエレメントの検査は、目視で行う以外に方法がなく、定量的に測定し評価可能なシステムが望まれていた。
In addition, since the type of light source, camera type, and range of acquired images affect the judgment, it is difficult to accurately and stably evaluate the surface of the fastener element. Therefore, there is no method other than visual inspection of the fastener element of the slide fastener, and a system capable of quantitative measurement and evaluation has been desired.
この発明は、上記背景技術に鑑みてなされたもので、スライドファスナのファスナエレメントの色の良否を、正確に且つ安定して評価することができるファスナエレメントの検査条件設定方法とファスナエレメント検査方法を提供することを目的とする。
The present invention has been made in view of the above-described background art, and provides a fastener element inspection condition setting method and a fastener element inspection method capable of accurately and stably evaluating the quality of a fastener element of a slide fastener. The purpose is to provide.
この発明は、スライドファスナのファスナエレメントの表面を撮影するカメラと、前記ファスナエレメントを照明する照明装置とを用いて、前記ファスナエレメントを撮影した画像を基に、前記ファスナエレメントの表面の色の良否を判別するファスナエレメントの検査条件設定方法であって、前記カメラにより撮影した画像に影響を与える複数の制御因子を選択し、各制御因子毎に所定の複数の条件を設定して、前記各制御因子の前記複数の条件で各々、前記スライドファスナの複数の前記ファスナエレメントを同時に撮影する撮影ステップと、前記カメラにより得られた複数の前記ファスナエレメントが撮影された複数のカラー画像について、前記各ファスナエレメント毎の個々の単位領域内のカラー画像データを抽出する画像抽出ステップと、前記各ファスナエレメントの前記単位領域の前記カラー画像データの各画素毎の光の３原色別の輝度値を求める輝度値算出ステップと、前記輝度値算出ステップで算出された光の３原色別の前記輝度値を基に、前記ファスナエレメントの色の誤圧を計算する誤圧算出ステップと、得られた前記誤圧を基に、前記各制御因子の設定条件毎に前記各ファスナエレメントの色のＳＮ比と感度を算出し、算出した前記ＳＮ比と前記感度の中から、相対的に値の大きい前記制御因子の設定条件を選択する制御因子選択ステップとを備えたファスナエレメントの検査条件設定方法である。
The present invention relates to the quality of the surface of the fastener element based on an image obtained by photographing the fastener element using a camera that photographs the surface of the fastener element of the slide fastener and an illumination device that illuminates the fastener element. A fastener element inspection condition setting method for determining a plurality of control factors that affect an image captured by the camera, and setting a plurality of predetermined conditions for each control factor, For each of the fasteners, a photographing step of simultaneously photographing the plurality of fastener elements of the slide fastener under the plurality of conditions of the factor, and a plurality of color images obtained by photographing the plurality of fastener elements obtained by the camera. Image extraction process to extract color image data in individual unit area for each element A luminance value calculating step for obtaining a luminance value for each of the three primary colors of light for each pixel of the color image data in the unit area of each fastener element, and 3 of the light calculated in the luminance value calculating step. An error pressure calculating step for calculating an error pressure of the color of the fastener element based on the luminance value for each primary color, and each fastener element for each setting condition of each control factor based on the error pressure obtained. A fastener element inspection comprising: a control factor selection step of calculating an SN ratio and sensitivity of a color of the color and selecting a setting condition of the control factor having a relatively large value from the calculated SN ratio and sensitivity This is a condition setting method.
前記誤圧算出ステップは、前記カラー画像データの各画素毎の光の３原色別の各輝度値について、前記カラー画像中の複数の前記ファスナエレメントの対応する前記光の３原色毎の輝度値の平均値に対する比である特徴値を求めて、前記誤圧を算出するものである。
In the erroneous pressure calculation step, for each luminance value for each of the three primary colors of light for each pixel of the color image data, the luminance value for each of the three primary colors of light corresponding to the plurality of fastener elements in the color image is calculated. The error value is calculated by obtaining a characteristic value that is a ratio to the average value.
またこの発明は、スライドファスナのファスナエレメントの表面を撮影するカメラと、前記ファスナエレメントを照明する照明装置とを用いて、前記ファスナエレメントを撮影した画像を基に、前記ファスナエレメントの表面の色の良否を判別するファスナエレメント検査方法であって、前記カメラにより撮影した画像に影響を与える複数の制御因子を選択し、各制御因子毎に検査に最適な条件を設定して、前記各制御因子の前記複数の条件で、前記スライドファスナの複数の前記ファスナエレメントを同時に撮影する撮影ステップと、前記カメラにより得られた複数の前記ファスナエレメントが撮影されたカラー画像について、前記各ファスナエレメント毎の個々の単位領域内のカラー画像データを抽出する画像抽出ステップと、前記各ファスナエレメントの前記単位領域の前記カラー画像データの各画素毎の光の３原色別の輝度値を求める輝度値算出ステップと、前記輝度値算出ステップで算出された光の３原色別の前記輝度値を基に算出した前記ファスナエレメントの色に関する値と所定の閾値とを比較して、前記ファスナエレメントの表面の色の良否を判別する判別ステップとを備えたファスナエレメント検査方法である。
According to the present invention, the color of the surface of the fastener element is obtained based on an image obtained by photographing the fastener element using a camera that photographs the surface of the fastener element of the slide fastener and an illumination device that illuminates the fastener element. A fastener element inspection method for determining pass / fail, wherein a plurality of control factors that affect an image captured by the camera are selected, optimal conditions for inspection are set for each control factor, and An imaging step of simultaneously photographing the plurality of fastener elements of the slide fastener under the plurality of conditions, and a color image obtained by photographing the plurality of fastener elements obtained by the camera, for each fastener element. An image extraction step for extracting color image data in the unit area; A luminance value calculating step for obtaining a luminance value for each of the three primary colors of light for each pixel of the color image data in the unit area of the fastener element; and the luminance for each of the three primary colors of light calculated in the luminance value calculating step A fastener element inspection method comprising: a determination step of determining whether the color of the surface of the fastener element is good by comparing a value relating to the color of the fastener element calculated based on the value with a predetermined threshold value.
さらに、判別ステップは、前記輝度値算出ステップで算出された光の３原色別の前記輝度値を基に、前記ファスナエレメントの色の誤圧を算出し、得られた前記誤圧を基に、前記ファスナエレメントの表面の色の良否を判別するものである。前記撮影ステップでの前記各制御因子毎の最適条件は、前記ファスナエレメントの検査条件設定方法による前記制御因子選択ステップにより選択されて、設定されるものである。
Further, the determination step calculates an error pressure of the color of the fastener element based on the luminance value for each of the three primary colors of light calculated in the luminance value calculation step, and based on the obtained error pressure, The color of the surface of the fastener element is determined. The optimum condition for each control factor in the imaging step is selected and set in the control factor selection step by the fastener element inspection condition setting method.
この発明のファスナエレメントの検査条件設定方法とファスナエレメント検査方法によれば、スライドファスナのエレメントの色の良否を、自動的に迅速かつ正確に判定することができ、安定して良好な品質管理を行うことができる。
According to the fastener element inspection condition setting method and fastener element inspection method of the present invention, the quality of the slide fastener element color can be automatically and quickly determined accurately, and stable and good quality control can be achieved. It can be carried out.
以下、この発明の一実施形態について、図面に基づいて説明する。この実施形態のスライドファスナのファスナエレメントの検査条件設定方法とファスナエレメント検査方法に用いる検査装置１０は、図１に示すように、ＣＣＤやＣ－ＭＯＳ等の撮像素子を備え、光の３原色である赤色（Ｒ）、緑色（Ｇ）、青色（Ｂ）の各画像データを取得可能なカメラ１２と、白色光のＬＥＤライト等を用いたドーム型照明による間接光により対象物を照明する照明装置１４から成る。照明装置１４を挟んでカメラ１２とは反対側には、ステージ１６上に配置された治具１８に、スライドファスナ２０が保持される。
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The inspection device 10 used in the fastener element inspection condition setting method and fastener element inspection method of the slide fastener according to this embodiment includes an image sensor such as a CCD or C-MOS as shown in FIG. A camera 12 capable of acquiring each red (R), green (G), and blue (B) image data, and an illuminating device that illuminates an object with indirect light using dome-shaped illumination using a white LED light or the like It consists of 14. A slide fastener 20 is held by a jig 18 disposed on the stage 16 on the side opposite to the camera 12 with the illumination device 14 interposed therebetween.
治具１８は、スライドファスナ２０の両側のファスナテープ２２を挟持する一対の保持部１９を備え、保持部１９間にスライドファスナ２０のエレメント２４が位置する。ここで検査するスライドファスナ２０は、個別のスライドファスナ２０毎に切断される前段の、スライドファスナチェーンとして形成された、長尺の紐状の部材であり、治具１８上を間欠的に送られて、後述する撮影方法によりエレメント２４が撮影される。
The jig 18 includes a pair of holding portions 19 that sandwich the fastener tapes 22 on both sides of the slide fastener 20, and the element 24 of the slide fastener 20 is positioned between the holding portions 19. The slide fastener 20 to be inspected here is a long string-like member formed as a slide fastener chain in the previous stage to be cut for each individual slide fastener 20, and is intermittently fed on the jig 18. Thus, the element 24 is photographed by the photographing method described later.
また、ファスナエレメントの検査条件を設定するために、検査対象の測定に影響する制御因子である照明装置の他の構成として、図２に示すリング型照明の照明装置３２を備えた検査装置３０も用意する。照明装置３２の発光面は、カメラ１２の光軸と直交し、照明装置３２の環の中心はカメラ１２の光軸と同心上に位置する。
Moreover, in order to set the inspection condition of the fastener element, as another configuration of the illumination device that is a control factor affecting the measurement of the inspection object, an inspection device 30 including the ring illumination device 32 shown in FIG. prepare. The light emitting surface of the illumination device 32 is orthogonal to the optical axis of the camera 12, and the center of the ring of the illumination device 32 is located concentrically with the optical axis of the camera 12.
検査装置１０，３０により、各種の条件で撮影された画像は、図３に示すように、スライドファスナ２０のエレメント２４が中央部に複数位置したものであり、この画像中の、例えば６個のエレメント２４が含まれるように撮影を行う。撮影した画像データは、後述する方法により処理して、エレメント２４の表面の色や状態を評価し、良否を判別する。
As shown in FIG. 3, the images taken by the inspection apparatuses 10 and 30 under various conditions are a plurality of elements 24 of the slide fastener 20 positioned in the center. Shooting is performed so that the element 24 is included. The photographed image data is processed by a method to be described later, and the color and state of the surface of the element 24 are evaluated to determine pass / fail.
次に、この実施形態のファスナエレメント検査方法を定めるための検査条件設定方法について、以下に述べる。先ず、カメラ１２により撮影した画像に影響を与える複数の制御因子を選択し、各制御因子毎に所定の複数の条件を設定して、各制御因子の複数の条件で各々、スライドファスナ２０の複数のファスナエレメント２４を含む範囲で撮影を行う。
Next, an inspection condition setting method for determining the fastener element inspection method of this embodiment will be described below. First, a plurality of control factors that affect the image captured by the camera 12 are selected, a plurality of predetermined conditions are set for each control factor, and a plurality of slide fasteners 20 are respectively set according to a plurality of conditions of each control factor. The image is taken in a range including the fastener element 24.
ここで、検査条件である制御因子を表１に示す。制御因子は例えば８種類であり、各制御因子毎に２又は３種類のパラメータである複数の条件としての水準を各々設定する。表1に示すように、８種類の制御因子としては、撮像の基本的な要素であるカメラ種（Ｆ）、照明種（Ｃ）、シャッタ速度（Ａ）、照明強度（Ｄ）、カメラの角度（Ｇ）等である。さらに、措定範囲内での測定対象エレメント数の増減による安定性の変化を見るために、測定エレメント数（Ｂ）を加え、誤差因子である背景色の影響を見るために、ファスナエレメント２４より大きい、等しい、小さい、の３種類の測定エリア寸法（Ｅ）を加え、ＬＥＤの発熱による影響を確認するため、ＬＥＤアイドリング時間（Ｈ）を加えたものである。
Here, the control factors which are inspection conditions are shown in Table 1. There are eight control factors, for example, and a level as a plurality of conditions that are two or three types of parameters is set for each control factor. As shown in Table 1, the eight types of control factors are the basic elements of imaging: camera type (F), illumination type (C), shutter speed (A), illumination intensity (D), and camera angle. (G) and the like. Furthermore, the number of measurement elements (B) is added in order to see the change in stability due to the increase or decrease in the number of elements to be measured within the specified range, and it is larger than the fastener element 24 in order to see the influence of the background color that is an error factor. In order to confirm the influence of the heat generation of the LED, the LED idling time (H) is added.
さらに、表２に示すように、測定結果に影響する誤差因子として、外乱光の有無および背景色の色を選定する。条件Ｎ１を外乱光ありで背景色：Ｊ１、条件Ｎ２は外乱光なしで背景色：Ｊ２とし、誤差が出やすい条件とした。
Furthermore, as shown in Table 2, the presence or absence of ambient light and the background color are selected as error factors that affect the measurement results. Condition N1 with ambient light and background color: J1 and condition N2 without ambient light and background color: J2 were set to allow easy error.
これらの制御因子での各水準、及び誤差因子の条件で撮影を行い、必要な数の撮影データを取得する。ここで、取得する撮影データは、各エレメント２４について、表１、表２のすべての条件での各々の撮影データを必要とするものではない。例えば品質工学におけるＬ１８直交表に必要な範囲で撮影データを取得すれば良いものであり、ファスナエレメント２４の評価に必要な検査条件を選定するのに必要な数の撮影データがあれば良い。
Photographers are taken under the conditions of each level with these control factors and error factors, and the required number of photographic data is acquired. Here, the acquired photographing data does not require the respective photographing data under all the conditions in Tables 1 and 2 for each element 24. For example, it is only necessary to acquire imaging data within a range necessary for an L18 orthogonal table in quality engineering, and it is sufficient if there are as many imaging data as necessary for selecting inspection conditions necessary for the evaluation of the fastener element 24.
次に、カメラ１２により得られた複数のファスナエレメント２４が撮影された各カラー画像について、各ファスナエレメント２４毎の個々の単位領域内のカラー画像データを抽出する。ここで単位領域とは、上述の制御因子の測定エリア寸法の設定に従い、ファスナエレメント２４より大きい、等しい、小さい、の３種類の領域のうちの選択された寸法の範囲である。
Next, color image data in each unit area for each fastener element 24 is extracted from each color image obtained by the camera 12 and photographed by the plurality of fastener elements 24. Here, the unit area is a range of a selected dimension among the three types of areas larger, equal, and smaller than the fastener element 24 according to the measurement area dimension setting of the control factor described above.
この後、各ファスナエレメント２４の単位領域のカラー画像データの各画素毎の光の３原色別の輝度値を求める。さらに、カメラ１２により撮影した画像の個々のファスナエレメント２４の単位領域の画素毎の画像データについて、ＲＧＢ毎に各画素の輝度値から求めた特徴値ｙｋｎ（ｋはサンプルNo.であり、ｎはサンプルの特徴値No.である。）を求める。そして、この特徴値を基に以下の式（１）～（７）により、各サンプルの誤圧を計算する。誤圧は、１本のスライドファスナ２０毎や、ファスナテープ２２の一定の長さの毎に求めても良い。
Thereafter, the luminance value for each of the three primary colors of light for each pixel of the color image data in the unit area of each fastener element 24 is obtained. Further, with respect to the image data for each pixel in the unit area of each fastener element 24 of the image photographed by the camera 12, the characteristic value y kn (k is a sample number, obtained from the luminance value of each pixel for each RGB). Is the feature value No. of the sample). Based on this characteristic value, the error pressure of each sample is calculated by the following equations (1) to (7). The erroneous pressure may be obtained for each slide fastener 20 or for each fixed length of the fastener tape 22.
以上のようにして、式(７)を基に、各サンプル毎に、スライドファスナエレメント２４の輝度値の誤圧の値を求める。ここでは、求めた誤圧をＤ（１）～Ｄ（ｋ）とし、測定環境の誤差因子Ｎ１，Ｎ２について、各サンプルのスライドファスナ２０のエレメント２４の変色処理量Ｘ１～Ｘｋを設定して、各スライドファスナ２０について誤圧を求めた。変色処理量とは、ファスナエレメント２４の検査条件設定するために、予めファスナエレメント２４の表面を段階的に変色させたものの各値で、所定の熱処理時間の違いにより変色の程度に差を持たせたものである。このサンプルは、実際の検査の前に行う検査条件設定のためのデータをとり、後述する検証用の実験に用いるためのものである。表３は、このようにして求めた、各変色処理量と誤圧の対応を示すものである。
As described above, the erroneous pressure value of the luminance value of the slide fastener element 24 is obtained for each sample based on the equation (7). Here, the obtained error pressures are D (1) to D (k), and the discoloration processing amounts X 1 to X k of the element 24 of the slide fastener 20 of each sample are set for the error factors N1 and N2 of the measurement environment. Thus, an erroneous pressure was obtained for each slide fastener 20. The discoloration processing amount is a value obtained by stepwise discoloration of the surface of the fastener element 24 in advance in order to set the inspection condition of the fastener element 24. It is a thing. This sample takes data for setting inspection conditions before actual inspection, and is used for a verification experiment described later. Table 3 shows the correspondence between the amount of color change processing and the erroneous pressure obtained in this way.
この後、さらに、最適条件の制御因子を選定するために、ＳＮ比と感度を以下の式により求める。
After this, in order to further select the control factor of the optimum condition, the S / N ratio and the sensitivity are obtained by the following equations.
以上の式を基に、上記８種類の制御因子について、撮影画像から得られたＲＧＢ毎の輝度値から上記のように誤圧を計算し、さらに、式（１７），（１８）を基にして、ＳＮ比と感度を算出し、この値から制御因子の最適条件を選定する。ＳＮ比および感度から選択する各制御因子の最適条件は、後述する図４、図５に示す実験結果のように、ＳＮ比と感度の値から選ばれるもので、図４、図５に示す要因効果図を基に選定する。
Based on the above formula, the error pressure is calculated as described above from the luminance value for each RGB obtained from the photographed image for the above eight types of control factors, and further based on formulas (17) and (18). Then, the SN ratio and sensitivity are calculated, and the optimum condition of the control factor is selected from these values. The optimum conditions for each control factor selected from the S / N ratio and sensitivity are selected from the values of S / N ratio and sensitivity as shown in the experimental results shown in FIGS. 4 and 5 described later. The factors shown in FIGS. Select based on effect chart.
図４、図５の要因効果図に示す○と◇は、ＳＮ比と感度が高くなる最適条件の組合せを（○）、相対的にＳＮ比と感度が低くなる最悪条件の組合せを（◇）で示す。これにより、各制御因子について、図示する○印の設定条件を製品検査の最適条件として設定する。例えば、この実施形態では、照明の種類は、図1に示すドーム型照明の方が図２に示すリング型照明装置よりも感度の点で好ましく、測定エリア寸法については、ファスナエレメント２４と等しい場合が、ＳＮ比について良い結果が得られた。同様に、他の制御因子についても、ＳＮ比と感度から、良好な結果が得られる条件を求めて検査を行う。
The circles and circles shown in the factor and effect diagrams of FIGS. 4 and 5 indicate combinations of optimum conditions that increase the S / N ratio and sensitivity (◯), and combinations of worst conditions that cause a relatively low S / N ratio and sensitivity (◇). It shows with. Thereby, for each control factor, the setting condition indicated by a circle is set as the optimum condition for product inspection. For example, in this embodiment, the dome type illumination shown in FIG. 1 is more preferable than the ring type illumination device shown in FIG. 2 in terms of sensitivity, and the measurement area size is equal to the fastener element 24 in this embodiment. However, good results were obtained for the SN ratio. Similarly, for other control factors, the conditions for obtaining good results are obtained from the SN ratio and sensitivity.
以上のファスナエレメントの検査条件設定方法により、検査のための最適条件の制御因子が選定されると、以後の検査において、選定された最適条件に各制御因子の水準を設定し、その条件で、ファスナエレメント２４の撮影を行う。
When the optimal condition control factor for inspection is selected by the above-described fastener element inspection condition setting method, in the subsequent inspection, the level of each control factor is set to the selected optimal condition. The fastener element 24 is photographed.
そして、得られた複数のファスナエレメント２４が撮影されたカラー画像について、各ファスナエレメント２４毎の個々の単位領域内のカラー画像データを抽出し、各ファスナエレメント２４の単位領域のカラー画像データの各画素毎の光の３原色別の輝度値を求め、算出された光の３原色別の輝度値を基に、上記と同様の計算処理により、ファスナエレメント２４の色の誤圧を計算する。そして、得られた誤圧を基に、誤圧が一定値以下か否かにより、ファスナエレメント２４の表面の色の良否を判別する。
Then, color image data in each unit area for each fastener element 24 is extracted from the obtained color image of the plurality of fastener elements 24, and each color image data in the unit area of each fastener element 24 is extracted. Luminance values for the three primary colors of light for each pixel are obtained, and based on the calculated luminance values for the three primary colors of light, the color error pressure of the fastener element 24 is calculated by the same calculation process as described above. Then, based on the obtained error pressure, whether the color of the surface of the fastener element 24 is good or not is determined based on whether the error pressure is a certain value or less.
また、判定は、誤圧を計算せずに、最適制御因子による測定条件で、他の色評価、例えばＬ＊ａ＊ｂ＊表色系の値から色評価を行っても良い。
In addition, the determination may be performed by performing color evaluation from other color evaluation, for example, a value of the L * a * b * color system, under the measurement conditions based on the optimum control factor without calculating the erroneous pressure.
この実施形態のファスナエレメントの検査条件設定方法とファスナエレメント検査方法によれば、スライドファスナ２０のファスナエレメント２４の色の良否を、客観的に定量的な判断を可能にし、自動的に迅速かつ正確に表面色の良否を判定することができ、安定して良好な品質管理を行うことができる。
According to the fastener element inspection condition setting method and the fastener element inspection method of this embodiment, the quality of the fastener element 24 of the slide fastener 20 can be objectively and quantitatively determined, and automatically and quickly. In addition, the quality of the surface color can be determined, and good quality control can be performed stably.
なお、この発明のファスナエレメントの検査条件設定方法とファスナエレメント検査方法は、上記実施形態に限定されるものではなく、制御因子や誤差因子の設定は適宜可能であり、因子の数も適宜選択可能なものである。
The fastener element inspection condition setting method and fastener element inspection method of the present invention are not limited to the above-described embodiment, and control factors and error factors can be set as appropriate, and the number of factors can be selected as appropriate. It is a thing.
次に、この発明のファスナエレメントの検査条件設定方法とファスナエレメント検査方法の実施例について、以下に説明する。ここでは、この発明のファスナエレメントの検査条件設定方法とファスナエレメント検査方法について、検証した実験結果を示す。先ず測定対象は、色の異なる不良品を想定して、段階的な変色処理Ｘ１～Ｘｋを施した製品と、処理していない製品（良品）を用意した。カメラ１２の出力値または、カメラ１２からの出力を処理した図示しないコンピュータからの出力値は、カメラ１２の撮像素子のそれぞれの画素から得られた輝度値について、２５６階調で各色Ｒ、Ｇ、Ｂの値を使用した。
Next, embodiments of the fastener element inspection condition setting method and the fastener element inspection method of the present invention will be described below. Here, the experimental result verified about the inspection condition setting method and fastener element inspection method of the fastener element of this invention is shown. First, assuming that defective products having different colors were used as measurement objects, products subjected to stepwise color change processing X 1 to X k and products not processed (non-defective products) were prepared. The output value of the camera 12 or the output value of a computer (not shown) that has processed the output from the camera 12 is the luminance value obtained from each pixel of the image sensor of the camera 12 with 256 tones for each color R, G, The value of B was used.
この実験結果を、図４、図５の要因効果図に示す。○と◇は、要因効果図をもとに、ＳＮ比と感度が高くなる最適条件の組合せを（○）、相対的にＳＮ比と感度が低くなる最悪条件の組合せを（◇）で示す。これにより、各制御因子について、図示する○印の設定条件を製品検査の最適条件として設定する。最適条件の水準と最悪条件の水準の選別は、表４に示す通りであった。
The results of this experiment are shown in the factor effect diagrams of FIGS. ○ and ◇ are based on the factor effect diagram, and (○) indicates the combination of the optimum conditions for increasing the S / N ratio and sensitivity, and (◇) indicates the combination of the worst conditions for the relatively low S / N ratio and sensitivity. Thereby, for each control factor, the setting condition indicated by a circle is set as the optimum condition for product inspection. Table 4 shows the selection of the optimum condition level and the worst condition level.
最適条件、最悪条件の２条件で測定を行った結果を図６、図７に示す。図６に示す最適条件では、上記Ｎ１、Ｎ２の両条件とも処理量が増えるとともに誤圧が同じ傾向で大きくなっており、誤差因子による影響を受けずに色の変化を測定できていることが分かる。また、図７に示す最悪条件では、Ｎ１、Ｎ２の条件で全く異なる傾向を示しており、誤差因子の影響を大きく受けており、安定した測定が出来ていないことが確認できた。
6 and 7 show the results of measurement under the two conditions of optimum conditions and worst conditions. Under the optimum conditions shown in FIG. 6, the processing pressure increases in both the above-mentioned conditions N1 and N2, and the error pressure increases with the same tendency, and the color change can be measured without being influenced by the error factor. I understand. Moreover, in the worst condition shown in FIG. 7, the tendency which is completely different by the conditions of N1 and N2 was shown, and it was greatly influenced by the error factor, and it has confirmed that the stable measurement was not able to be performed.
表５に、この発明で用いたＬ１８直交表の実験によって得られたＳＮ比と感度をもとに計算した最適条件、最悪条件のＳＮ比と感度の推定値と利得、確認実験によって得られたＳＮ比と感度の結果と利得を示す。確認実験で得られた利得は、推定よりもＳＮ比が約３［ｄｂ］低く、感度は約４０高い値を示したが、同様の傾向を示しており、要因図の妥当性と再現性を確認することができた。
Table 5 shows the optimum conditions calculated based on the S / N ratio and sensitivity obtained in the L18 orthogonal table experiment used in the present invention, the worst-case S / N ratio and the estimated value and gain of the sensitivity, and the confirmation experiment. The result and gain of the signal to noise ratio and sensitivity are shown. The gain obtained in the confirmation experiment was about 3 [db] lower in the S / N ratio than the estimated value, and the sensitivity was about 40 higher. However, the same tendency was shown, and the validity and reproducibility of the factor diagram were improved. I was able to confirm.
以上の結果から、スライドファスナのファスナエレメントの測色において、色の異なる製品の識別が安定的にできる条件を選択することができ、スライドファスナのファスナエレメントの色の検査を高品質で行うことができることが確かめられた。
Based on the above results, it is possible to select conditions that allow stable identification of products with different colors in color measurement of fastener elements of slide fasteners, and to perform color inspection of fastener elements of slide fasteners with high quality. It was confirmed that it could be done.
１０ 検査装置
１２ カメラ
１４，３２ 照明装置
１８ 治具
２０ スライドファスナ
２２ ファスナテープ
２４ ファスナエレメント DESCRIPTION OFSYMBOLS 10 Inspection apparatus 12 Camera 14, 32 Illumination apparatus 18 Jig 20 Slide fastener 22 Fastener tape 24 Fastener element
１２ カメラ
１４，３２ 照明装置
１８ 治具
２０ スライドファスナ
２２ ファスナテープ
２４ ファスナエレメント DESCRIPTION OF
Claims (4)
- スライドファスナ（２０）のファスナエレメント（２４）の表面を撮影するカメラ（１２）と、前記ファスナエレメント（２４）を照明する照明装置（１４）とを用いて、前記ファスナエレメント（２４）を撮影した画像を基に、前記ファスナエレメント（２４）の表面の色の良否を判別するファスナエレメントの検査条件設定方法において、
前記カメラ（１２）により撮影した画像に影響を与える複数の制御因子を選択し、各制御因子毎に所定の複数の条件を設定して、前記各制御因子の前記複数の条件で各々、前記スライドファスナ（２０）の複数の前記ファスナエレメント（２４）を同時に撮影する撮影ステップと、
前記カメラ（１２）により得られた複数の前記ファスナエレメント（２４）が撮影された複数のカラー画像について、前記各ファスナエレメント（２４）毎の個々の単位領域内のカラー画像データを抽出する画像抽出ステップと、
前記各ファスナエレメント（２４）の前記単位領域の前記カラー画像データの各画素毎の光の３原色別の輝度値を求める輝度値算出ステップと、
前記輝度値算出ステップで算出された光の３原色別の前記輝度値を基に、前記ファスナエレメント（２４）の色の誤圧を計算する誤圧算出ステップと、
得られた前記誤圧を基に、前記各制御因子の設定条件毎に前記各ファスナエレメント（２４）の色のＳＮ比と感度を算出し、算出した前記ＳＮ比と前記感度の中から、相対的に値の大きい前記制御因子の設定条件を選択する制御因子選択ステップとを備えたことを特徴とするファスナエレメントの検査条件設定方法。 The fastener element (24) was photographed using a camera (12) for photographing the surface of the fastener element (24) of the slide fastener (20) and a lighting device (14) for illuminating the fastener element (24). In the fastener element inspection condition setting method for determining the quality of the surface of the fastener element (24) based on the image,
A plurality of control factors that affect the image captured by the camera (12) are selected, a plurality of predetermined conditions are set for each control factor, and the slides are respectively set according to the plurality of conditions of the control factors. A photographing step of simultaneously photographing a plurality of the fastener elements (24) of the fastener (20);
Image extraction for extracting color image data in each unit area for each fastener element (24) from a plurality of color images obtained by photographing the plurality of fastener elements (24) obtained by the camera (12). Steps,
A luminance value calculating step for obtaining a luminance value for each of the three primary colors of light for each pixel of the color image data in the unit area of each fastener element (24);
An error pressure calculating step for calculating an error pressure of the color of the fastener element (24) based on the luminance values for the three primary colors of light calculated in the luminance value calculating step;
Based on the obtained error pressure, the SN ratio and sensitivity of the color of each fastener element (24) are calculated for each setting condition of each control factor, and the relative ratio is calculated from the calculated SN ratio and sensitivity. A fastener element inspection condition setting method comprising: a control factor selection step for selecting a setting condition for the control factor having a large value. - 前記誤圧算出ステップは、前記カラー画像データの各画素毎の光の３原色別の各輝度値について、前記カラー画像中の複数の前記ファスナエレメント（２４）の対応する前記光の３原色毎の輝度値の平均値に対する比である特徴値を求めて、前記誤圧を算出するものである請求項１記載のファスナエレメントの検査条件設定方法。 The error pressure calculating step includes, for each luminance value for each of the three primary colors of light for each pixel of the color image data, for each of the three primary colors of light corresponding to the plurality of fastener elements (24) in the color image. 2. The fastener element inspection condition setting method according to claim 1, wherein the error value is calculated by obtaining a characteristic value which is a ratio of a luminance value to an average value.
- スライドファスナ（２０）のファスナエレメント（２４）の表面を撮影するカメラ（１２）と、前記ファスナエレメント（２４）を照明する照明装置（１４）とを用いて、前記ファスナエレメント（２４）を撮影した画像を基に、前記ファスナエレメント（２４）の表面の色の良否を判別するファスナエレメント検査方法において、
前記カメラ（１２）により撮影した画像に影響を与える複数の制御因子を選択し、各制御因子毎に検査に最適な条件を設定して、前記各制御因子の前記複数の条件で、前記スライドファスナ（２０）の複数の前記ファスナエレメント（２４）を同時に撮影する撮影ステップと、
前記カメラ（１２）により得られた複数の前記ファスナエレメント（２４）が撮影されたカラー画像について、前記各ファスナエレメント（２４）毎の個々の単位領域内のカラー画像データを抽出する画像抽出ステップと、
前記各ファスナエレメント（２４）の前記単位領域の前記カラー画像データの各画素毎の光の３原色別の輝度値を求める輝度値算出ステップと、
前記輝度値算出ステップで算出された光の３原色別の前記輝度値を基に算出した前記ファスナエレメント（２４）の色に関する値と所定の閾値とを比較して、前記ファスナエレメント（２４）の表面の色の良否を判別する判別ステップとを備えたことを特徴とするファスナエレメント検査方法。 The fastener element (24) was photographed using a camera (12) for photographing the surface of the fastener element (24) of the slide fastener (20) and a lighting device (14) for illuminating the fastener element (24). In the fastener element inspection method for determining the quality of the surface of the fastener element (24) based on the image,
A plurality of control factors that affect the image captured by the camera (12) are selected, and optimum conditions for inspection are set for each control factor, and the slide fastener is set according to the plurality of conditions of each control factor. A photographing step of simultaneously photographing the plurality of fastener elements (24) of (20);
An image extracting step of extracting color image data in each unit region for each fastener element (24) from a color image obtained by photographing the plurality of fastener elements (24) obtained by the camera (12); ,
A luminance value calculating step for obtaining a luminance value for each of the three primary colors of light for each pixel of the color image data in the unit area of each fastener element (24);
A value related to the color of the fastener element (24) calculated based on the luminance value for each of the three primary colors of light calculated in the luminance value calculation step is compared with a predetermined threshold value, and the fastener element (24) A fastener element inspection method comprising: a determination step of determining whether the surface color is good or bad. - 判別ステップは、前記輝度値算出ステップで算出された光の３原色別の前記輝度値を基に、前記ファスナエレメント（２４）の色の誤圧を算出し、得られた前記誤圧を基に、前記ファスナエレメント（２４）の表面の色の良否を判別する請求項３記載のファスナエレメント検査方法。 In the determining step, an error pressure of the color of the fastener element (24) is calculated based on the luminance value for each of the three primary colors of light calculated in the luminance value calculating step, and based on the obtained error pressure. 4. The fastener element inspection method according to claim 3, wherein the color of the surface of the fastener element (24) is determined.
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