JP6572648B2 - Granular resin inspection device and inspection method - Google Patents
Granular resin inspection device and inspection method Download PDFInfo
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Description
本発明は、繊維や樹脂成形品などの原材料となる粒状樹脂の欠陥検査に関する。 The present invention relates to a defect inspection of a granular resin that is a raw material for fibers, resin molded products, and the like.
ポリアミド樹脂を用いた繊維や樹脂成形品などは強靭性、耐疲労性などに優れているため、各種の産業資材用途に広く用いられている。これらのポリアミド樹脂やそれよりなる物品は比較的酸化劣化されやすく、とくに高温において酸素と接触するような場合には著しく酸化劣化され、重合度の低下や諸物性の低下を引き起こすことが知られている。 Fibers and resin molded products using polyamide resins are excellent in toughness and fatigue resistance, and are therefore widely used in various industrial material applications. These polyamide resins and articles comprising them are relatively easily oxidized and deteriorated, especially when they come into contact with oxygen at high temperatures, and are known to cause a decrease in the degree of polymerization and various physical properties. Yes.
たとえば、ポリアミド樹脂の一部に蛍光発色傾向を有する劣化した物質が含まれていると、紫外光下では白色を呈する傾向があることから、ポリアミド樹脂製の糸を巻き取ったチーズを紫外光下に置き、蛍光発色があるかどうか目視で調べることが行われていた（特許文献１）。 For example, if a part of a polyamide resin contains a deteriorated substance having a tendency to fluoresce, it tends to appear white under ultraviolet light. And visually inspecting whether or not there is fluorescence coloring (Patent Document 1).
また、ポリアミド樹脂成形品は、光学的な性質が熱分解によって変化し、蛍光反応を示すようになると考えられていることから、表面に紫外光を照射し、その部分で蛍光を発するかどうかを検査者が紫外線フィルタを透過して観察し、白く浮き出たように見える部分があると熱分解が進行している、と判断していた（特許文献２）。 In addition, since it is thought that the optical properties of polyamide resin molded products change due to thermal decomposition and become fluorescent, the surface is irradiated with ultraviolet light and whether or not the portion emits fluorescence. The inspector observed through the ultraviolet filter, and if there was a part that appeared to be white, it was determined that the thermal decomposition was proceeding (Patent Document 2).
また、成形前の透明または半透明の粒状樹脂の欠陥検査では、着色異物が含まれているかどうかについて、通常の照明に加えて紫外光を照射し、目視によらず、撮像した画像により検査することが提案されていた（特許文献３）。この方法によれば、外部から通常の照明光を当てた場合のように端部に影を生じることがなく、影を欠陥部分（着色異物）と見誤ることがないので、ソフトウェア的な影の除去も必要ではなく、確実に被検査物に含まれる着色部分のみを検出できることが記載されている。 In addition, in the defect inspection of transparent or semi-transparent granular resin before molding, whether or not a colored foreign material is contained is irradiated with ultraviolet light in addition to normal illumination, and is inspected by a captured image without visual inspection. (Patent Document 3). According to this method, there is no shadow at the edge as in the case of applying ordinary illumination light from the outside, and the shadow is not mistaken for a defective portion (colored foreign matter). There is no need for removal, and it is described that only the colored portion contained in the inspection object can be detected reliably.
しかしながら、特許文献１はポリアミド樹脂を糸にした後に劣化物があるかどうかを検査するものであり、また特許文献２はポリアミド樹脂を成形した後に熱分解した箇所があるかどうかを検査するものであり、いずれも作業者が目視で検査を行っていた。また、特許文献３は成形前の粒状樹脂に着色異物が含まれているかどうかを検査するというもので、透明または半透明の粒状樹脂を撮像し、黒色に見える斑点などを含む粒状樹脂を不良品と判定する。しかしながら、透明または半透明の粒状樹脂に酸化劣化あるいは熱分解が進行しているものが含まれているかを検査するものではない。 However, Patent Document 1 is for inspecting whether there is a deteriorated product after the polyamide resin is used as a thread, and Patent Document 2 is for inspecting whether there is a portion thermally decomposed after the polyamide resin is molded. Yes, in all cases, workers were inspecting visually. Patent Document 3 inspects whether or not colored foreign substances are contained in the granular resin before molding. An image of transparent or translucent granular resin is taken, and the granular resin including spots that appear black is defective. Is determined. However, it does not inspect whether a transparent or translucent granular resin contains one that has undergone oxidative degradation or thermal decomposition.
本発明の目的は、粒状樹脂の検査において、酸化劣化あるいは熱分解が進行した欠陥が含まれているかどうかを、粒状樹脂からの蛍光発光現象を利用して自動検査できる検査装置ならびに検査方法を提供することにある。 An object of the present invention is to provide an inspection apparatus and an inspection method capable of automatically inspecting a granular resin by using a fluorescent light emission phenomenon from the granular resin to determine whether or not defects that have undergone oxidation degradation or thermal decomposition are included. There is to do.
上記課題を解決するため、本発明の粒状樹脂検査装置は、粒状樹脂を平面状に配置する整列手段と、前記粒状樹脂に紫外光域を含む光線を照射する照明手段と、前記粒状樹脂からの蛍光および反射光を撮像する撮像手段と、前記撮像手段が取得した撮像画像を処理する画像処理手段と、を備え、
前記画像処理手段が、撮像画像から粒状樹脂の一つ一つを抽出する抽出手段と、前記抽出手段によって抽出された画像Ｂから粒状樹脂の良否判定の妨げとなる外周部を除去する外周除去手段と、外周部除去された画像Ａから輝度の高い部分を欠陥として判定する判定手段を備えることを特徴とする。
In order to solve the above problems, the granular resin inspection apparatus according to the present invention includes an alignment unit that arranges the granular resin in a planar shape, an illuminating unit that irradiates the granular resin with a light beam including an ultraviolet light region, and the granular resin. Imaging means for imaging fluorescence and reflected light, and image processing means for processing a captured image acquired by the imaging means ,
The image processing means is an extraction means for extracting each of the granular resins from the captured image, and an outer periphery removing means for removing an outer peripheral portion that hinders the quality determination of the granular resin from the image B extracted by the extraction means. When, characterized Rukoto comprises determining means for high luminance portion as a defect from the image a which is the outer peripheral portion removal.
本発明の粒状樹脂検査装置において、撮像手段が以下の（１）から（３）のいずれかのように構成されているとよい。
（１）単一の受光感度を有する受光素子からなる受光素子群を備える
（２）受光感度の異なる２種以上の受光素子からなる受光素子群を備える
（３）可視光域の一部、または全部に受光感度を有する受光素子からなる受光素子群を備える
上記の（１）あるいは（３）において、撮像手段は、異なる波長領域毎に分離して通過させる、または、特定の波長領域を選択的に通過させる波長分離手段を備え、粒状樹脂からの蛍光および反射光が前記波長分離手段を通過した光を撮像することが望ましい。
In the granular resin inspection apparatus of the present invention, the imaging means may be configured as any one of the following (1) to (3).
(1) A light receiving element group including a light receiving element having a single light receiving sensitivity is provided. (2) A light receiving element group including two or more types of light receiving elements having different light receiving sensitivities is provided. In the above (1) or (3), the imaging means separates and passes each different wavelength region, or selectively selects a specific wavelength region. It is desirable to provide a wavelength separation means for passing through and image the light from which fluorescence and reflected light from the granular resin have passed through the wavelength separation means.
上記の（１）、（２）、および（３）において、樹脂がポリアミドであり、少なくとも１種の受光素子からなる受光素子群の最大受光感度が、蛍光の波長範囲が含まれる４００〜６２０ｎｍの範囲であると好適である。 In the above (1), (2), and (3), the resin is polyamide, and the maximum light receiving sensitivity of the light receiving element group including at least one light receiving element is 400 to 620 nm including the fluorescence wavelength range. A range is preferable.
本発明の粒状樹脂検査装置において、画像処理手段は、撮像画像から粒状樹脂の一つ一つを抽出する抽出手段と、前記抽出手段によって抽出された画像Ｂから粒状樹脂の良否判定の妨げとなる外周部を除去する外周除去手段と、外周除去された画像Ａから粒状樹脂の良否を判定する判定手段とを備えるとよい。判定手段では、前記画像Ａの輝度情報と、前記画像Ａに対して２値化処理を行った後の面積情報と、の２つの情報を用いて、前記粒状樹脂の良否を判定する。 In the granular resin inspection apparatus of the present invention, the image processing means hinders the quality determination of the granular resin from the extracting means for extracting each of the granular resins from the captured image and the image B extracted by the extracting means. An outer periphery removing unit that removes the outer periphery and a determination unit that determines the quality of the granular resin from the image A from which the outer periphery has been removed may be provided. In the determination means, the quality of the granular resin is determined using two pieces of information: luminance information of the image A and area information after the binarization process is performed on the image A.
ここで、整列手段が、前記粒状樹脂をあらかじめ設定された位置に配置するようすることで、前記の抽出処理手段を不要とすることもできる。 Here, it is possible to dispense with the extraction processing unit by arranging the granular resin at a preset position.
また、本発明の粒状樹脂検査方法は、粒状樹脂を平面状に配置して紫外光域を含む光線を照射し、前記粒状樹脂からの蛍光および反射光を撮像し、取得した撮像画像を画像処理することを特徴とする。 Further, the granular resin test method of the present invention, by placing the granular resin in a planar shape is irradiated with light containing ultraviolet light region, the granular resin or these fluorescence and imaging the reflected light, images captured image acquired It is characterized by processing.
ここで、粒状ポリアミド樹脂からの特定波長領域、好ましくは４００〜６２０ｎｍの範囲の蛍光および反射光を撮像するとよい。 Here, it is good to image fluorescence and reflected light in a specific wavelength region from the granular polyamide resin, preferably in the range of 400 to 620 nm.
本発明の粒状樹脂検査装置ならびに粒状樹脂検査方法によれば、平面状に配置した粒状樹脂に紫外光域を含む光線を照射し、粒状樹脂からの蛍光および反射光を撮像し、撮像画像を画像処理することで、粒状樹脂に酸化劣化あるいは熱分解が進行しているものが含まれているかどうかを精度よく検査することができる。したがって、粒状樹脂の品質の定量化実現や欠陥品見逃し防止という効果が得られる。 According to the granular resin inspection apparatus and the granular resin inspection method of the present invention, the granular resin arranged in a plane is irradiated with a light beam including an ultraviolet light region, and fluorescence and reflected light from the granular resin are imaged. By performing the treatment, it is possible to accurately inspect whether the granular resin contains one that has undergone oxidation degradation or thermal decomposition. Therefore, it is possible to obtain the effects of quantifying the quality of the granular resin and preventing missing defective products.
本発明の実施の形態について、図面を参照しながら説明する。 Embodiments of the present invention will be described with reference to the drawings.
図１は本発明の粒状樹脂検査装置の一例を模式的に示した概略図である。本発明の検査装置１は、被検査物である数ミリメートル程度の大きさの粒状樹脂２を平面状に配置する整列装置（図示しない）と、被検査物に紫外光を含む光線３ａを照射する光源３と、粒状樹脂２からの蛍光および反射光２ａを撮像する撮像装置４と、撮像装置４が撮像した撮像画像を画像処理する画像処理装置５とで構成されている。熱や酸化などで劣化した透明または半透明の粒状樹脂２は紫外光を含む光線３ａを受けると、蛍光を発する性質がある。したがって、粒状樹脂２が熱や酸化などで劣化している場合、粒状樹脂２からの光２ａは蛍光および反射光を含んだ光となり、劣化の度合いが大きいと粒状樹脂２からの光２ａは強くなる。蛍光発光を含む光２ａを撮像することで、粒状樹脂２を検査することができる。 FIG. 1 is a schematic view schematically showing an example of the granular resin inspection apparatus of the present invention. The inspection apparatus 1 according to the present invention irradiates a light beam 3a containing ultraviolet light to an inspection apparatus and an alignment apparatus (not shown) that arranges a granular resin 2 having a size of several millimeters, which is an inspection object, in a planar shape. The light source 3, an imaging device 4 that captures fluorescence and reflected light 2 a from the granular resin 2, and an image processing device 5 that performs image processing on a captured image captured by the imaging device 4. The transparent or translucent granular resin 2 deteriorated by heat, oxidation, or the like has a property of emitting fluorescence when it receives light 3a including ultraviolet light. Therefore, when the granular resin 2 is deteriorated due to heat or oxidation, the light 2a from the granular resin 2 becomes light including fluorescence and reflected light. When the degree of deterioration is large, the light 2a from the granular resin 2 is strong. Become. The granular resin 2 can be inspected by taking an image of the light 2a including fluorescent light emission.
平面状に配置された粒状樹脂２がたとえばコンベアのような搬送装置６で連続的あるいは間欠的に順次搬送され、撮像部に搬送された粒状樹脂２に光源３から紫外光を含む光線３ａを照射する。粒状樹脂２からの蛍光および反射光２ａをラインセンサカメラあるいはエリアセンサカメラのような撮像装置４で撮像する。画像処理装置５は、撮像装置４で得られた画像を処理することで、良否判定を行なう。 The granular resin 2 arranged in a planar shape is sequentially or intermittently conveyed by a conveyance device 6 such as a conveyor, and the granular resin 2 conveyed to the imaging unit is irradiated with a light beam 3a including ultraviolet light from the light source 3. To do. The fluorescent and reflected light 2a from the granular resin 2 is imaged by an imaging device 4 such as a line sensor camera or an area sensor camera. The image processing device 5 performs pass / fail determination by processing the image obtained by the imaging device 4.
粒状樹脂２は、必ず１列に整列させて配置する必要はなく、たとえば広範囲に分散した状態で平面状に配置してもよい。分散して配置された粒状樹脂２の一部がたとえば重なり合う、あるいは、いくつかの粒状樹脂２が直立して配置されると、それらの粒状樹脂２は平面状に配置されている他の粒状樹脂２よりも光源３との距離が近くなる。光源３との距離が近くなるとそれらの粒状樹脂２表面の照度は平面状に配置されている他の粒状樹脂２よりも高くなり、反射光が強くなり光２ａは強くなる。したがって、一部が重なり合う、あるいは、直立して配置された粒状樹脂２は、たとえそれらの粒状樹脂２が蛍光を発していなくても、平面状に配置されている他の粒状樹脂２より高い階調値で画像化されることになる。これらの現象はのちの良否判定の正確性を損なう可能性があるため、粒状樹脂２を平面状に配置することで、各粒状樹脂２の表面が同程度の高さとなるようにし、各粒状樹脂２の表面と光源３との距離をできるだけ一定となるようにする。 The granular resin 2 does not necessarily need to be arranged in a line, and may be arranged in a planar shape in a state of being dispersed over a wide range, for example. For example, when part of the granular resins 2 arranged in a manner of being overlapped, or when some granular resins 2 are arranged upright, the granular resins 2 are arranged in a plane. 2 is closer to the light source 3 than 2. When the distance from the light source 3 is reduced, the illuminance on the surface of the granular resin 2 becomes higher than that of the other granular resin 2 arranged in a plane, the reflected light becomes stronger, and the light 2a becomes stronger. Therefore, the granular resins 2 that are partially overlapped or arranged upright are higher than the other granular resins 2 arranged in a plane, even if the granular resins 2 do not emit fluorescence. It will be imaged with tone values. Since these phenomena may impair the accuracy of the quality determination later, by arranging the granular resin 2 in a planar shape, the surface of each granular resin 2 becomes the same height, and each granular resin 2 The distance between the surface 2 and the light source 3 is made as constant as possible.
光源３は粒状樹脂２に紫外線光を含む光線３ａを照射し、粒状樹脂２の蛍光発光を促す。光源３は、たとえば紫外線ＬＥＤ光源や紫外線ランプあるいは紫外線光源ＢＯＸとライトガイドの組み合わせなど、紫外光を含む光線３ａを照射可能であれば光源の種類は限定しない。 The light source 3 irradiates the granular resin 2 with a light beam 3 a containing ultraviolet light, and promotes the fluorescent emission of the granular resin 2. The type of the light source 3 is not limited as long as the light source 3 can irradiate light rays 3a including ultraviolet light, such as an ultraviolet LED light source, an ultraviolet lamp, or a combination of an ultraviolet light source BOX and a light guide.
光線３ａは、配置された粒状樹脂２に対して均一に照射可能であれば、リング型、スポット照射型、四角型、ライン照射型などいかなる形状のものから照射されていてもよい。また、各撮像毎の再現性を得るために、光線３ａの照度は一定の値にしておくことが好適である。 The light beam 3a may be irradiated from any shape such as a ring type, a spot irradiation type, a square type, and a line irradiation type as long as the arranged granular resin 2 can be irradiated uniformly. In order to obtain reproducibility for each imaging, it is preferable to set the illuminance of the light beam 3a to a constant value.
撮像装置４は、備えている受光素子群で、粒状樹脂２からの蛍光および反射光２ａを受光し、粒状樹脂２の撮像を行う。撮像装置４に備える受光素子群は、たとえば（１）モノクロカメラのように単一の受光感度を有する受光素子からなるもの、あるいは（３）可視光域の一部、または全部に受光感度を有する受光素子からなるものを用いてもよいし、（２）カラーカメラのような受光感度の異なる複数の受光素子からなるものを用いてもよい。 The imaging device 4 receives the fluorescence and the reflected light 2a from the granular resin 2 by the light receiving element group provided, and images the granular resin 2. The light receiving element group included in the imaging device 4 includes, for example, (1) a light receiving element having a single light receiving sensitivity, such as a monochrome camera, or (3) a light receiving sensitivity in part or all of the visible light region. A light receiving element may be used, or (2) a light receiving element having a plurality of light receiving sensitivities such as a color camera may be used.
また、粒状樹脂２からの蛍光および反射光２ａを、光学フィルタなどを用いて特定の波長領域を選択的に通過させる、あるいはプリズムのように異なる波長領域毎に分離して通過させるなどの波長分離手段を用いて、任意の波長成分の光を、単一の受光感度、あるいは可視光域の一部、または全部に受光感度を有する受光素子からなる受光素子群、もしくは受光感度の異なる複数の受光素子からなる受光素子群を備える撮像装置４で撮像してもよい。また、ポリアミド樹脂が発する蛍光の波長範囲は青〜緑の範囲に含まれるため、いずれの撮像形態においても、最大受光感度が４００〜６２０ｎｍの波長範囲である受光素子を含むことが好適である。 In addition, wavelength separation such as allowing fluorescence and reflected light 2a from the granular resin 2 to selectively pass through a specific wavelength region using an optical filter or the like, or to pass through separately in different wavelength regions like a prism. Means to receive light of an arbitrary wavelength component, a single light receiving sensitivity, a light receiving element group consisting of light receiving elements having a light receiving sensitivity in part or all of the visible light range, or a plurality of light receiving devices having different light receiving sensitivities. You may image with the imaging device 4 provided with the light receiving element group which consists of an element. Further, since the wavelength range of fluorescence emitted by the polyamide resin is contained in the range of blue-green, in any of the imaging mode, it is preferable that the maximum light reception sensitivity includes a light-receiving element is a wavelength range of 400~620nm .
図２に画像処理フローの一例を示す。撮像装置４で取得した粒状樹脂２の画像は、画像処理装置５において図２に示すフローで処理される。画像処理フローの詳細については、後述する。画像処理装置５は、専用の画像処理ソフトウェアを備えたＰＣ、あるいは画像処理用のハードウェアなどを用いてもよいし、代わって撮像装置４にＣＰＵが備わり撮像と画像処理が一体化して行えるものを用いてもよい。 FIG. 2 shows an example of the image processing flow. The image of the granular resin 2 acquired by the imaging device 4 is processed in the flow shown in FIG. Details of the image processing flow will be described later. The image processing apparatus 5 may use a PC equipped with dedicated image processing software, hardware for image processing, or the like. Alternatively, the imaging apparatus 4 is equipped with a CPU, and imaging and image processing can be integrated. May be used.
図３は粒状樹脂２の配置状態の一例である。粒状樹脂２の配置と整列は、図３のように、粒状樹脂２を並べる樹脂配置箇所７（たとえばトレーやコンベアなど）の決められた位置に毎回確実に粒状樹脂２を整列させ、各粒状樹脂２の存在している場所（たとえば粒状樹脂２の重心座標など）をあらかじめ決定しておく。粒状樹脂２の存在している場所をあらかじめ決定しておくことで、蛍光を検査する範囲（画像処理する範囲）を固定して良否判定ができるため、後述する画像処理装置５における外周部除去処理や粒状樹脂２の一つ一つを抽出する処理が不要となる。 FIG. 3 is an example of an arrangement state of the granular resin 2. As shown in FIG. 3, the granular resin 2 is arranged and aligned at every predetermined position of a resin arrangement place 7 (for example, a tray or a conveyor) where the granular resin 2 is arranged. 2 is determined in advance (for example, the barycentric coordinates of the granular resin 2). By determining in advance the location where the granular resin 2 is present, it is possible to determine whether or not the fluorescent inspection range (image processing range) is fixed, so that an outer peripheral portion removal process in the image processing apparatus 5 described later can be performed. In addition, the process of extracting each of the granular resins 2 becomes unnecessary.
図４〜図６は粒状樹脂２の外周部２ｂを除去する際の画像の状態を示している。粒状樹脂２に光線３ａを照射し撮像すると、粒状樹脂２は蛍光発光の有無にかかわらず、図４のように外周部２ｂが明るく見える場合がある。これは粒状樹脂２の外周部２ｂの形状が中心部に比べ極端な曲面形状で、かつ各粒状樹脂２によってその形状が微妙に異なり、粒状樹脂２の外周部２ｂの形状によっては中心部よりも外周部２ｂの反射光のほうが強くなるためである。この明るく見える外周部２ｂを検査の対象に含めると、蛍光を発していない場合でも誤って蛍光を有する粒状樹脂２として検出される場合があり、粒状樹脂２の良否判定する際のノイズ要因となりえるので、図２のＳ１とＳ２の処理により画像上の粒状樹脂２の外周部２ｂを除去する。 4 to 6 show the state of an image when the outer peripheral portion 2b of the granular resin 2 is removed. When imaging is performed by irradiating the granular resin 2 with the light beam 3a, the outer peripheral portion 2b of the granular resin 2 may appear bright as shown in FIG. This is because the shape of the outer peripheral portion 2b of the granular resin 2 is an extremely curved surface shape compared to the central portion, and the shape is slightly different depending on each granular resin 2, and depending on the shape of the outer peripheral portion 2b of the granular resin 2, it is more than the central portion. This is because the reflected light from the outer peripheral portion 2b becomes stronger. If the outer peripheral portion 2b that looks bright is included in the inspection target, it may be erroneously detected as the granular resin 2 having fluorescence even when it does not emit fluorescence, which may be a noise factor when determining the quality of the granular resin 2. Therefore, the outer peripheral portion 2b of the granular resin 2 on the image is removed by the processing of S1 and S2 in FIG.
前述の図３の実施形態においては、画像上の粒状樹脂２の一つ一つを抽出し、各粒状樹脂２の外周部２ｂを除去する工程は不要であるが、決められた位置に毎回確実に粒状樹脂２を整列させる作業は負荷が大きく、かつ各粒状樹脂２同士が隣接しないように間隔を空けて配置する必要があるため、単位面積当たりに配置できる粒状樹脂２の数（１回の検査量）が制限される。また、作業者の負荷を減らすために、たとえばロボットアームなどを用いて粒状樹脂の整列を自動化してもよいが、この場合装置のコストが大幅に増加するという懸念もある。このため、たとえばトレーなどに粒状樹脂２を投入して手でゆする、あるいは仕切りのようなもので均すなどして決められた範囲にできるだけ多くの粒状樹脂２を広範囲に分散した状態で平面状に配置し、画像処理により画像上の粒状樹脂２の一つ一つを抽出し、各粒状樹脂２の外周部２ｂを除去する方法が好適である。 In the embodiment of FIG. 3 described above, the step of extracting each granular resin 2 on the image and removing the outer peripheral portion 2b of each granular resin 2 is not required, but it is ensured every time at a predetermined position. Since the operation of aligning the granular resins 2 is heavy and it is necessary to arrange the granular resins 2 at intervals so that the granular resins 2 are not adjacent to each other, the number of granular resins 2 that can be arranged per unit area (one time (Inspection amount) is limited. In order to reduce the load on the operator, the alignment of the granular resin may be automated using, for example, a robot arm, but in this case, there is a concern that the cost of the apparatus is greatly increased. For this reason, for example, the granular resin 2 is put in a tray or the like and shaken by hand, or leveled with a partition or the like, so that as much granular resin 2 as possible is dispersed in a wide range. A method in which the granular resin 2 on the image is extracted one by one by image processing and the outer peripheral portion 2b of each granular resin 2 is removed is preferable.
また、図２のＳ３で粒状樹脂２の一つ一つを抽出することで、後の良否判定処理Ｓ７において、検査対象になった粒状樹脂２の個数や、蛍光を発する粒状樹脂２の個数を一個単位で計測でき、たとえば多くの粒状樹脂２群の中に混入しているたった１個の蛍光発光を有する粒状樹脂２を検出することできる。Ｓ２の外周部を除去する処理には、膨張・収縮処理や、２値化、減算処理などの組み合わせなどが、Ｓ３の粒状樹脂２の一つ一つを抽出する処理には、膨張・収縮処理や領域分割処理などが、用いられる場合が多い。粒状樹脂２の良否判定には、画像処理により画像上の各粒状樹脂２の外周部２ｂを除去し、粒状樹脂２の一つ一つを抽出した画像（図６）を用いることが好適である。 Further, by extracting each of the granular resins 2 in S3 of FIG. 2, the number of granular resins 2 to be inspected and the number of granular resins 2 that emit fluorescence in the subsequent pass / fail judgment process S7 are obtained. For example, it is possible to detect the granular resin 2 having only one fluorescent emission mixed in many granular resin groups. Combinations of expansion / contraction processing, binarization, subtraction processing, and the like are included in the processing for removing the outer peripheral portion of S2, and expansion / contraction processing is included in the processing for extracting each granular resin 2 in S3. In many cases, an area division process or the like is used. For determining the quality of the granular resin 2, it is preferable to use an image (FIG. 6) in which the outer peripheral portion 2 b of each granular resin 2 on the image is removed by image processing and each granular resin 2 is extracted. .
画像上において蛍光を発する粒状樹脂２を構成する画素の階調値（＝輝度）は、蛍光を発しない粒状樹脂２の輝度よりも高くなるので、判定手段にはＳ４で計測した各粒状樹脂２の輝度情報やＳ５やＳ６で２値化処理した際の白画素の残留面積などの情報を用いることができる。良否判定処理Ｓ７では、各粒状樹脂２の輝度情報を用いて判定する場合は、それらの最大輝度や最小輝度あるいは平均輝度などを判定の基準にすることができる。また、２値化処理により白画素の面積などの情報を良否判定に利用する場合は、たとえばその面積を計測しその計測値を基準に検査された粒状樹脂２群の欠陥品判定を行うことができる。 Since the gradation value (= luminance) of the pixels constituting the granular resin 2 that emits fluorescence on the image is higher than the luminance of the granular resin 2 that does not emit fluorescence, each granular resin 2 measured in S4 is used as a determination means. Luminance information and information such as the remaining area of the white pixel when binarized in S5 and S6 can be used. In the quality determination process S7, when the determination is made using the luminance information of each granular resin 2, the maximum luminance, the minimum luminance, the average luminance, or the like can be used as a criterion for determination. When information such as the area of the white pixel is used for pass / fail determination by binarization processing, for example, the area is measured and defective products of the granular resin 2 group inspected based on the measured value are determined. it can.
本発明の粒状樹脂検査装置ならびに粒状樹脂検査方法は、ポリアミド樹脂のほかＡＢＳ樹脂やＰＥＴ樹脂の自動検査に利用することができる。 The granular resin inspection apparatus and granular resin inspection method of the present invention can be used for automatic inspection of ABS resin and PET resin in addition to polyamide resin.
１ 粒状樹脂検査装置
２ 粒状樹脂
３ 光源
４ 撮像装置
５ 画像処理装置
６ 粒状樹脂搬送装置
７ 樹脂配置箇所
８ 撮像画像
DESCRIPTION OF SYMBOLS 1 Granular resin inspection apparatus 2 Granular resin 3 Light source 4 Imaging device 5 Image processing apparatus 6 Granular resin conveyance apparatus 7 Resin arrangement location 8 Captured image
Claims (10)
前記画像処理手段が、撮像画像から粒状樹脂の一つ一つを抽出する抽出手段と、前記抽出手段によって抽出された画像Ｂから粒状樹脂の良否判定の妨げとなる外周部を除去する外周除去手段と、外周部除去された画像Ａから輝度の高い部分を欠陥として判定する判定手段を備えることを特徴とする粒状樹脂検査装置。 In an apparatus for inspecting defects in which granular resin has undergone oxidative degradation or thermal decomposition, alignment means for arranging the granular resin in a planar shape, illumination means for irradiating the granular resin with a light beam including an ultraviolet region, and the granular resin An imaging means for imaging fluorescence and reflected light from the image processing means, and an image processing means for processing a captured image acquired by the imaging means ,
The image processing means is an extraction means for extracting each of the granular resins from the captured image, and an outer periphery removing means for removing an outer peripheral portion that hinders the quality determination of the granular resin from the image B extracted by the extraction means. If, granular resin inspection apparatus according to claim Rukoto comprises a determining means from the image a which is the outer peripheral portion removal with high luminance portion as a defect.
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