JP5004297B2 - Calibration plate - Google Patents
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- JP5004297B2 JP5004297B2 JP2008079988A JP2008079988A JP5004297B2 JP 5004297 B2 JP5004297 B2 JP 5004297B2 JP 2008079988 A JP2008079988 A JP 2008079988A JP 2008079988 A JP2008079988 A JP 2008079988A JP 5004297 B2 JP5004297 B2 JP 5004297B2
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Description
本発明は、被測定物をデジタルカメラなどで撮影して、光学的に被測定物の形状を計測する画像の幾何学的歪を較正するために用いられるキヤリブレーションプレートに関するものである。 The present invention relates to a calibration plate used for calibrating the geometric distortion of an image obtained by photographing an object to be measured with a digital camera or the like and optically measuring the shape of the object to be measured.
カメラなどで撮影された画像には、レンズの光学的歪みやカメラと被写体への撮影角度の違いから、幾何学的な歪が発生する。これら被測定物を撮像した画像から被測定物の形状を計測する場合には、発生した画像歪を較正する必要がある。 An image photographed with a camera or the like has a geometric distortion due to optical distortion of the lens and a difference in photographing angle between the camera and the subject. When measuring the shape of the object to be measured from an image obtained by imaging the object to be measured, it is necessary to calibrate the generated image distortion.
一般に、画像歪の較正の方法としては、表面に点状のマークを配置したキャリブレーションプレートと呼ばれる部材を用いて行い、当該キャリブレーション用プレートを撮影した画像により、夫々対応する点状のマークの画像の位置を比較して修正されている。 In general, as a method for calibrating image distortion, a member called a calibration plate in which dot marks are arranged on the surface is used, and an image obtained by photographing the calibration plate is used for each corresponding dot mark. The image position has been compared and corrected.
ところで、画像測定法を使用して、対象物の寸法を計測する場合の精度はこの測定法の原理上、画像撮影時の光学系の精度に依存するため、画像上の座標と実平面の座標を対応させることが必要である。 By the way, since the accuracy when measuring the dimensions of an object using the image measurement method depends on the accuracy of the optical system at the time of image capture in principle of this measurement method, the coordinates on the image and the coordinates on the real plane It is necessary to correspond.
そこで、従来技術において画像処理におけるステレオ法を用いた位置測定用のキャリブレーションに関して、下面を無反射処理した透明基板の上面に不透明の黒色パターンを備えたキャリブレーションプレートや不透明基板上に窪みのパターンを設けその窪みに不透明基板と光反射率が異なるように無反射処理し形成したキャリブレーションが特開平１０−１０４０３３号公報で開示されている。この発明は、無反射処理した基板や不透明基板に描かれたパターンを基板の上面側又は下面側から照明することにより、基板におけるパターンと反対側への陰の出現の影響を少なくすることができるものである。 Therefore, with regard to calibration for position measurement using the stereo method in image processing in the prior art, a calibration plate having an opaque black pattern on the upper surface of a transparent substrate with a non-reflective treatment on the lower surface or a pattern of depressions on the opaque substrate Japanese Patent Application Laid-Open No. 10-104033 discloses a calibration formed by providing non-reflective treatment so that a light reflectance is different from that of an opaque substrate. According to the present invention, by illuminating a pattern drawn on a non-reflective substrate or an opaque substrate from the upper surface side or the lower surface side of the substrate, it is possible to reduce the influence of appearance of shadows on the opposite side of the pattern on the substrate. Is.
これによって、この発明はパターンの部分と陰とのコントラストが明確になり、キャリブレーションのための画像処理が容易となり、また、撮影画像のパターンのずれの影響が少なくなるので、キャリブレーションの精度が向上する。 As a result, the present invention makes clear the contrast between the pattern portion and the shade, facilitates image processing for calibration, and reduces the influence of pattern deviation of the photographed image. improves.
しかしながら、従来のキャリブレーションプレートはそのプレートの上面側の光源によりパターンが照明されるが、光源に近い箇所では照度が高く、遠い箇所では低くなって明るさにムラができる。それをカメラで取り込んだキャリブレーションプレートの撮像画像ではパターン部の明暗のコントラストが不均一となり、パターン部の抽出処理が困難となる。また前記特開平１０−１０４０３３号において照明位置によるパターンの陰の影響を少なくす方法は光源の位置を調整しなければならず、しかもその調整が面倒であった。そして、この方法ではパターンの影は薄くなるが完全になくすことは困難であり、このため、その陰の部分もパターン画像に取り込まれ画像処理上パターンの各測定点を正確に抽出することが困難であった。また、全体が均一な照度となる照明装置は、大変高価なものであった。さらに、従来のキャリブレーションプレートは取り扱い中に障害物に当たって表面が損傷することがあり、この損傷部分を較正用パターンの一部として誤検出するようなこともあった。 However, in the conventional calibration plate, the pattern is illuminated by the light source on the upper surface side of the plate, but the illuminance is high at a location close to the light source, and the brightness is uneven at a location far from the light source. In the captured image of the calibration plate captured by the camera, the contrast of light and dark in the pattern portion becomes non-uniform, and the pattern portion extraction processing becomes difficult. In the method disclosed in Japanese Patent Laid-Open No. 10-104033, the method of reducing the influence of the shadow of the pattern due to the illumination position has to adjust the position of the light source, and the adjustment is troublesome. In this method, the shadow of the pattern becomes thin, but it is difficult to completely eliminate the shadow. For this reason, it is difficult to accurately extract each measurement point of the pattern in the image processing because the shaded part is also captured in the pattern image. Met. Moreover, the illuminating device with the uniform illuminance as a whole is very expensive. Furthermore, the conventional calibration plate sometimes hits an obstacle during handling and the surface may be damaged, and this damaged part may be erroneously detected as a part of the calibration pattern.
本発明は、上記の問題点に着目してなされたものであり、安価で、かつ、画像処理における位置、寸法測定で高精度な較正が可能なキャリブレーションプレートを提供することを目的としている。 The present invention has been made paying attention to the above-described problems, and an object of the present invention is to provide a calibration plate that is inexpensive and capable of highly accurate calibration by measuring position and dimensions in image processing.
請求項１記載の発明は、被写体の撮影画像の較正や歪補正するためのキャリブレーションプレートにおいて、平板状の透明体に所定間隔に貫通穴又は底を有した穴で整列させた多数穴のパターンを設け、光を前記キャリブレーションプレート本体の外周側面側から内部に入射し前記多数穴を照らして照射させたパターンを穴明け面側に現出させることを要旨とする。 The invention according to claim 1 is a calibration plate for calibrating a photographed image of a subject and correcting distortion. A multi-hole pattern in which a flat transparent body is aligned with holes having through holes or bottoms at predetermined intervals. And a pattern irradiated with light from the outer peripheral side surface of the calibration plate main body and illuminated by illuminating the multiple holes appears on the drilled surface side.
請求項１記載の発明によると、平板状の透明体に所定間隔に貫通穴又は底を有した穴で整列させた多数穴のパターンを設けているため、光をキャリブレーションプレート本体外周側面側から入射し、整列させた多数穴を照射することにより、前記穴は穴の径中心に入射光が集中し輝度が増すと共にプレート本体の多数穴のパターンを光らせることができる。よって、本発明のキャリブレーションプレートは、輝度差の少ない多数穴のパターンを穴明け面側に現出させることができ、またキャリブレーションプレート本体と多数穴のパターンとの明暗のコントラストを高めることができる。 According to the first aspect of the present invention, since the multi-hole pattern aligned with the through holes or the holes having the bottom is provided at a predetermined interval on the flat transparent body, the light is transmitted from the outer peripheral side of the calibration plate main body. By irradiating a large number of incident and aligned holes, incident light concentrates at the center of the diameter of the hole, the brightness increases, and the pattern of the multiple holes in the plate body can be illuminated. Therefore, the calibration plate of the present invention can cause a pattern of a large number of holes with a small luminance difference to appear on the drilled surface side, and can increase the contrast of light and dark between the calibration plate body and the pattern of a large number of holes. it can.
本発明のキャリブレーションプレート本体の素材は、透明ガラスの他、アクリル樹脂、メタクリル樹脂、フルオレフィン系樹脂、シクロオレフィン樹脂、エポキシ樹脂、ポリカーボネート樹脂などの透明樹脂が使用される。また、本発明ではキャリブレーションプレート本体を剛性を有した低比重の透明樹脂で成形すれば軽量で取り扱い易く、また穴の加工もし易い利点がある。
また光の照明はキャリブレーションプレートの外周側面辺りに配置される。本発明では照明として蛍光灯を用いたが、長寿命で消費電力の少ない発光ダイオードを用いてもよい。
As a material of the calibration plate body of the present invention, transparent resin such as acrylic resin, methacrylic resin, full olefin resin, cycloolefin resin, epoxy resin, polycarbonate resin, etc. is used in addition to transparent glass. Further, in the present invention, if the calibration plate body is formed of a transparent resin having a low specific gravity having rigidity, there is an advantage that it is easy to handle because it is light and easy to handle.
Light illumination is arranged around the outer peripheral side surface of the calibration plate. In the present invention, a fluorescent lamp is used as illumination. However, a light-emitting diode having a long life and low power consumption may be used.
また、底を有した穴であれば、底面積の増加により光の照射面積が増すとともにキャリブレーションプレート内の入射光が反射してパターン画像の穴の輝度が増すこととなる。これによって、本発明は照射された複数穴のパターンの輝度値を一層高くして現出でき、その撮像したパターン画像の穴の座標軸と輝度に基づき演算してより正確な中心位置を求めることができる。穴の底は穴の片端に壁を形成して設けてもよいが、穴の中間辺りに壁を形成して設けてもよい。さらに本発明の穴の底部を円錐状又は半球状に形成しておけば、キャリブレーションプレート内の入射光が穴の径中心に屈折集合し、より一層輝度が増す利点がある。 In addition, if the hole has a bottom, an increase in the bottom area increases the light irradiation area, and the incident light in the calibration plate is reflected to increase the brightness of the hole in the pattern image. As a result, the present invention can make the brightness value of the irradiated pattern of the plurality of holes higher, and can calculate based on the coordinate axis and the brightness of the hole of the captured pattern image to obtain a more accurate center position. it can. The bottom of the hole may be provided by forming a wall at one end of the hole, but may be provided by forming a wall around the middle of the hole. Furthermore, if the bottom of the hole of the present invention is formed in a conical shape or a hemispherical shape, there is an advantage that incident light in the calibration plate is refracted at the center of the diameter of the hole and the brightness is further increased.
請求項２記載の発明は、被写体の撮影画像の較正や歪補正するためのキャリブレーションプレートにおいて、平板状の透明体に所定間隔に貫通穴又は底を有した穴で整列させた多数穴のパターンを設けると共に上下両面又はその何れかの片面に遮光層を形成してなり、光を前記キャリブレーションプレート本体の外周側面側から内部に入射し前記穴に照射させ前記多数穴を照射して得たパターンを前記穴明け面側に現出させることを要旨とする。 The invention according to claim 2 is a calibration plate for calibrating a photographed image of a subject and correcting distortion, and a pattern of multiple holes arranged on a flat transparent body with holes having through holes or bottoms at predetermined intervals. And a light shielding layer is formed on both the upper and lower surfaces or any one of the surfaces, and light is incident on the inside from the outer peripheral side surface of the calibration plate main body to irradiate the holes to obtain the multiple holes. The gist is to make the pattern appear on the perforated surface side.
パターンを近くでカメラで撮像する場合、キャリブレーションプレート本体の外周付近の穴はより斜め方向からの撮影となるために、穴の外形像がキャリブレーションプレート本体を透過して写し出されることがあるが、請求項２記載の発明によれば、遮光層により穴の外形像が遮光されるので穴の部分だけが写し出される。 When the pattern is imaged with a camera nearby, the hole near the outer periphery of the calibration plate body is taken from a more oblique direction, so the outline image of the hole may be projected through the calibration plate body. According to the second aspect of the invention, since the outer shape image of the hole is shielded by the light shielding layer, only the hole portion is projected.
また、キャリブレーションプレート本体の表面が透明体のままの場合、その表面に傷がつくと、そこから光が漏れ、較正用パターンとの分離が困難になる場合があるが、請求項２記載の発明によると、キャリブレーションプレート本体の上下両面又はその何れかの片面に遮光層が形成されているため、遮光層側に傷がつき難く、傷による校正用パターンの混乱を防止できる。遮光層は着色顔料を塗布して形成されるが、顔料の色を黒色とすれば光を吸収しコントラストを高めることができるので好ましい。また遮光層はその着色顔料の代わりに光を通さないフィルムを本体に貼り付けてもよい。 Further, in the case where the surface of the calibration plate body remains a transparent body, if the surface is scratched, light may leak from the surface and separation from the calibration pattern may be difficult. According to the invention, since the light shielding layer is formed on the upper and lower surfaces of the calibration plate main body or any one of them, the light shielding layer is hardly damaged, and the calibration pattern can be prevented from being confused by the scratch. The light shielding layer is formed by applying a color pigment, and it is preferable to make the color of the pigment black because it can absorb light and increase the contrast. Further, the light shielding layer may be affixed to the main body with a film that does not transmit light instead of the colored pigment.
本発明のキャリブレーションプレートは、上記の通り光を透明体の外周側面側から入射し、貫通する多数穴のパターン又は底部を有する多数穴のパターンを照射させ、キャリブレーションプレート本体の穴明け面側に多数穴のパターンを現出できると共に、簡単な構造であるので安価ででき、またその多数穴のパターンをカメラで撮影することで各穴像間に輝度差の少なく、かつ、コントラストの高い鮮明な画像を得ることができ、穴画像のみの抽出を容易とすることが可能となる。 In the calibration plate of the present invention, light is incident from the outer peripheral side of the transparent body as described above, and a pattern of a multi-hole penetrating or a pattern of a multi-hole having a bottom is irradiated, and the calibration plate body has a drilled surface side. In addition, a large number of hole patterns can be displayed, and since it is a simple structure, it can be made inexpensive, and by photographing the multiple hole pattern with a camera, there is little difference in brightness between each hole image and high contrast is clear. A simple image can be obtained, and extraction of only the hole image can be facilitated.
そして、本発明は多数穴で構成されるパターンが側面からの入射光で照明されるので従来キャリブレーションプレートで下面側又は上面側の光源の遠・近により発生していた穴パターンの照度差が小さくなり、コンピュータでの画像処理における穴パターン像のみの抽出を容易とすることができる。また、穴の中心部に光が集中し、輝度が高くなることから穴像のより正確な中心位置を求めることができ、高精度な較正が可能となる。また必要に応じてキャリブレーションプレート本体の上下両面又は何れかの片面に遮光層を設けておけば、キャリブレーションプレート本体を透して穴の外形像が映しだされることなく、また表面が保護され、プレートを取り扱うなかなどでの傷発生による光の乱反射を防止できるという効果を奏する。 In the present invention, since a pattern composed of a large number of holes is illuminated with incident light from the side surface, the illuminance difference of the hole pattern that has occurred in the conventional calibration plate due to the distance between the light source on the lower surface side or the upper surface side is Thus, it is possible to easily extract only the hole pattern image in the image processing by the computer. In addition, since light concentrates in the center of the hole and the brightness increases, a more accurate center position of the hole image can be obtained, and highly accurate calibration is possible. If necessary, if a light-shielding layer is provided on both the upper and lower surfaces of the calibration plate body or one of the surfaces, the outer shape of the hole is not projected through the calibration plate body, and the surface is protected. In addition, there is an effect that irregular reflection of light due to generation of scratches while handling the plate can be prevented.
以下、図１〜図５に基づいて、本発明に係わるキャリブレーションプレートの実施形態を説明する。図１は第１実施形態におけるキャリブレーションプレートの断面図である。図２は第２実施形態におけるキャリブレーションプレートの断面図である。図３は第２実施例のキャリブレーションプレートの使用状態を示す説明図である。図４は第２実施例の穴の縦断面拡大図である。図５は穴の他の形態を示す説明図である。
そして、１はキャリブレーションプレート、２はキャリブレーションプレート本体、３は穴、４は多数穴のパターン、５は遮光層、６は照明である。
Hereinafter, an embodiment of a calibration plate according to the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of a calibration plate in the first embodiment. FIG. 2 is a cross-sectional view of a calibration plate in the second embodiment. FIG. 3 is an explanatory view showing a usage state of the calibration plate of the second embodiment. FIG. 4 is an enlarged longitudinal sectional view of the hole of the second embodiment. FIG. 5 is an explanatory view showing another form of the hole.
1 is a calibration plate, 2 is a calibration plate body, 3 is a hole, 4 is a pattern of multiple holes, 5 is a light shielding layer, and 6 is illumination.
本実施形態において、キャリブレーションプレート本体２は図１に示すように剛性で軽量な透明性を有するアクリル樹脂の平板で作られる。この平板に、格子状に穴３を整列させる。パターン４はそれら配列された多数の穴３で構成される。穴３は本実施例では中空の貫通した穴で形成したが、図５に示すように穴の形態は（ａ）の上下両端の径を異にしたテーパ穴や（ｂ）の穴の中間辺りに底壁を設けた穴でもよく、さらに（ｃ）に示すように片端に底壁を設けた穴でもよい。また底を有した穴は特にその底部形状について限定されないが、市販のドリルで穴あけ加工して円錐形状に形成しておけば、その底の傾斜面で入射光が穴の中心に向かって屈折集合し輝度値が増加するので画像処理において穴の中心をより正確に求め易くなる。 In this embodiment, the calibration plate body 2 is made of a rigid and lightweight acrylic resin flat plate as shown in FIG. The holes 3 are aligned in a lattice pattern on this flat plate. The pattern 4 is composed of a large number of holes 3 arranged therein. In the present embodiment, the hole 3 is formed as a hollow through hole. However, as shown in FIG. 5, the shape of the hole is a tapered hole having different diameters at the upper and lower ends of (a) and the middle part of the hole of (b). It may be a hole provided with a bottom wall, or a hole provided with a bottom wall at one end as shown in FIG. In addition, the hole with the bottom is not particularly limited with respect to the shape of the bottom, but if the hole is drilled with a commercially available drill and formed into a conical shape, the incident light refracts toward the center of the hole on the inclined surface of the bottom. Since the brightness value increases, the center of the hole can be obtained more accurately in the image processing.
キャリブレーションプレート１の第１実施例形態ではキャリブレーションプレートプレート本体２に横９個、縦７個の貫通穴を設け、その貫通穴を径２ｍｍとしたが、具体的には被測定物に合わせて大きさ、穴の数量を決定する。例えば両足のサイズを画像測定する場合、キャリブレーションプレートは足の大きさに応じて縦４００ｍｍ、横４４０ｍｍ、厚みを５ｍｍとし、それに等間隔２５ｍｍで横１７個、縦１５個の貫通穴３からなる多数穴のパターン４を穴明け加工して完成させてもよい。穴３は２〜５ｍｍ径の大きさが好ましい。これは穴の径を２ｍｍ未満とすると輝度が小さくなり、カメラ画像では十分な高さの信号値とならない場合がある。また径５ｍｍ以上とすると、穴画像解析での中心部の誤差が大きくなるという問題がある。 In the first embodiment of the calibration plate 1, the calibration plate plate body 2 is provided with nine horizontal holes and seven vertical through holes, and the through holes have a diameter of 2 mm. Determine the size and quantity of holes. For example, when measuring the size of both feet, the calibration plate has a length of 400 mm, a width of 440 mm and a thickness of 5 mm according to the size of the foot, and is composed of 17 horizontal holes and 15 vertical holes 3 at equal intervals of 25 mm. The multi-hole pattern 4 may be completed by drilling. The hole 3 preferably has a diameter of 2 to 5 mm. This is because if the hole diameter is less than 2 mm, the luminance decreases, and the signal value may not be sufficiently high in the camera image. Further, when the diameter is 5 mm or more, there is a problem that an error in the center portion in the hole image analysis becomes large.
次に、完成したキャリブレーションプレートの使用方法を説明する。キャリブレーションプレート1は、多数穴のパターン面をカメラに向け寸法測定器の測定面（図示なし）に置き、キャリブレーションプレート１の四方の外周側面からキャリブレーションプレート内に照明装置から光を入射してプレート本体内に全反射光を作り出す。この全反射光がプレート中を進む途中に穴があると、その光は穴から外部に漏れる。この漏れた光に基づくパターンをカメラ７で撮影する。 Next, how to use the completed calibration plate will be described. The calibration plate 1 is placed on the measurement surface (not shown) of the dimension measuring instrument with the pattern surface of many holes facing the camera, and light from the illuminating device is incident on the calibration plate from the four outer peripheral side surfaces of the calibration plate 1. To create totally reflected light in the plate body. If there is a hole in the middle of the total reflected light traveling through the plate, the light leaks from the hole to the outside. The camera 7 captures a pattern based on the leaked light.
そして、本発明の第１実施例のキャリブレーションプレートを用いて撮影した画像は照射された多数穴のパターンの画像データを得ることができるため、明暗のコントラストが高い鮮明な画像データが得られる。これによって、本発明は従来のパターンによる陰が全く発生せず、またパターン画像の穴の座標軸と輝度により穴の中心をコンピュータにより演算して、より正確に中心位置を求めることでき、画像処理における位置測定で高精度の較正を図ることができた。 And since the image image | photographed using the calibration plate of 1st Example of this invention can obtain the image data of the pattern of the irradiated many holes, clear image data with a high contrast of light and dark can be obtained. As a result, the present invention does not cause any shadow due to the conventional pattern, and the center of the hole can be calculated by the computer based on the coordinate axis and brightness of the hole of the pattern image, and the center position can be obtained more accurately. We were able to calibrate with high precision by position measurement.
次に、キャリブレーションプレートの第２実施例形態では、図２から図４に示すように前記第１実施例のキャリブレーションプレート本体２に底壁３２を設け底３１を有する穴３を整列させた複数穴のパターン４を形成する。そして、キャリブレーションプレートの複数穴のパターン４の面に黒色の着色顔料を塗って遮光層５を形成して完成させる。前記遮光層５は多数穴のパターン４の面と同一面の表面側に形成したが、必要に応じてプレートの上下両面もしくは裏面側のみに形成してもよい。 Next, in the second embodiment of the calibration plate, as shown in FIGS. 2 to 4, the calibration plate body 2 of the first embodiment is provided with the bottom wall 32 and the holes 3 having the bottom 31 are aligned. A pattern 4 having a plurality of holes is formed. Then, a black color pigment is applied to the surface of the pattern 4 of the plurality of holes of the calibration plate to form the light shielding layer 5 and completed. The light shielding layer 5 is formed on the front side of the same surface as the surface of the multi-hole pattern 4, but may be formed only on the upper and lower surfaces or the back side of the plate as necessary.
次に、前記完成した第２実施例形態のキャリブレーションプレートの使用方法を図３に基づいて説明する。第１実施例と同様にキャリブレーションプレート1のパターン面をデジタルカメラ７に向けて寸法測定器の測定面（図示なし）に置き、キャリブレーションプレート１の四方の外周側面から蛍光灯などの照明６．６…をあてキャリブレーションプレート内に光６１を入射し、全反射した光がプレート内部を進行して底を有した穴に照射して穴から反射光が漏れる。これにより、キャリブレーションプレートの表面側に照射した多数穴のパターンを現出させたキャリブレーションプレートが得られ、その多数穴のパターンをデジタルカメラ７で撮影する。 Next, a method of using the calibration plate of the completed second embodiment will be described with reference to FIG. As in the first embodiment, the pattern surface of the calibration plate 1 is placed on the measurement surface (not shown) of the dimension measuring device so as to face the digital camera 7, and illumination 6 such as a fluorescent lamp is applied from the four outer peripheral side surfaces of the calibration plate 1. .6... Is incident on the calibration plate, the totally reflected light travels inside the plate and irradiates the hole with the bottom, and the reflected light leaks from the hole. As a result, a calibration plate in which a pattern of multiple holes irradiated on the surface side of the calibration plate is displayed is obtained, and the pattern of the multiple holes is photographed by the digital camera 7.
そして、本発明の第２実施例のキャリブレーションプレートを用いて撮影される画像は多数穴のパターン以外のプレート部分では、光は全反射して進行し、光は外には出ていかないので、多数穴のパターンとの明暗のコントラストが高い鮮明な画像が得られる。これによって、本発明は従来のプレートにおける照明のムラやパターンによる陰が全く発生せず、またこのパターン画像データに基づいて、穴の中心を算出することにより、より正確に中心位置を求めることできる。これにより、画像処理における位置解析により、高精度の較正を図ることができた。 And the image photographed using the calibration plate of the second embodiment of the present invention, the light is totally reflected in the plate portion other than the multi-hole pattern, and the light does not go out, A clear image with a high contrast of light and dark with the pattern of many holes can be obtained. As a result, the present invention does not cause any illumination unevenness or pattern shading in the conventional plate, and can calculate the center position more accurately by calculating the center of the hole based on the pattern image data. . As a result, high-precision calibration could be achieved by position analysis in image processing.
そして、本発明はカメラの撮影角度によりキャリブレーションプレート外周部の穴の外形像がキャリブレーションプレート本体を透過しても遮光層で遮光されるため写し出されることがなく、またキャリブレーションプレート本体を保護して表面の損傷が防止される。しかも、本発明のキャリブレーションプレート本体は上記の通り透明樹脂の平板に穴を設け、側面から光を内部に入射したもので簡単な構造であり安価で作成できる利点がある。 According to the present invention, the outline image of the hole on the outer periphery of the calibration plate is not projected because it is shielded by the light shielding layer even if it passes through the calibration plate body, and the calibration plate body is protected. And surface damage is prevented. Moreover, the calibration plate main body of the present invention has an advantage that it is simple and has a simple structure because holes are formed in a transparent resin flat plate as described above, and light is incident from the side.
本発明は前記の通りキャリブレーションプレートを足型測定器において足のサイズ測定に使用したが、これに限定されず被測定物の画像較正に使用することができる。 In the present invention, the calibration plate is used for measuring the size of the foot in the foot-type measuring device as described above. However, the present invention is not limited to this and can be used for image calibration of the object to be measured.
１ キャリブレーションプレート
２ キャリブレーションプレート本体
３ 穴 ３１ 穴の底 ３２ 底壁
４ パターン
５ 遮光層
６ 照明 ６１ 光
７ デジタルカメラ
DESCRIPTION OF SYMBOLS 1 Calibration plate 2 Calibration plate body 3 Hole 31 Bottom of hole 32 Bottom wall 4 Pattern 5 Light shielding layer 6 Illumination 61 Light 7 Digital camera
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| JP5477658B2 (en) * | 2010-11-29 | 2014-04-23 | 独立行政法人産業技術総合研究所 | Calibration jig for calibration, 3D measurement system with calibration jig |
| JP2013170861A (en) * | 2012-02-20 | 2013-09-02 | Dainippon Screen Mfg Co Ltd | Imaging apparatus, sample holding plate and imaging method |
| KR101390882B1 (en) | 2013-02-27 | 2014-04-30 | 한국표준과학연구원 | Calibration plate device for camera |
| KR101426314B1 (en) * | 2014-04-24 | 2014-08-06 | (주)코어센스 | Jig for synthesizing image of color camera and thermal camera |
| KR101681105B1 (en) * | 2016-06-28 | 2016-12-02 | 주식회사 파인에스엔에스 | Device for calibration target |
| KR102391667B1 (en) * | 2017-09-11 | 2022-04-28 | 한국전자기술연구원 | Plate for Simultaneous Calibration of Video Camera and Thermo-Graphic Camera |
| KR102012568B1 (en) * | 2017-11-30 | 2019-08-20 | 한국로봇융합연구원 | Multi sensor calibration system and calibration method for multi sensor |
| JP7320909B2 (en) * | 2020-05-29 | 2023-08-04 | キヤノン化成株式会社 | Calibration block and method of manufacturing calibration block |
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| JPH0615973B2 (en) * | 1985-06-03 | 1994-03-02 | 日本電信電話株式会社 | Mark data collection method for camera position and orientation calibration |
| US5825483A (en) * | 1995-12-19 | 1998-10-20 | Cognex Corporation | Multiple field of view calibration plate having a reqular array of features for use in semiconductor manufacturing |
| JPH10104033A (en) * | 1996-09-27 | 1998-04-24 | Komatsu Ltd | Calibration plate of imaging device, calibration device using above described plate and three-dimensional position measuring device |
| JPH10148719A (en) * | 1996-11-19 | 1998-06-02 | Seiko Epson Corp | Illuminator |
| JP3854599B2 (en) * | 2002-12-25 | 2006-12-06 | 株式会社アサヒコーポレーション | Foot type measuring instrument |
| JP2007033040A (en) * | 2005-07-22 | 2007-02-08 | Moritex Corp | Method and device for calibrating optical head part in three-dimensional shape measuring instrument by optical cutting method |
| JP2010139329A (en) * | 2008-12-10 | 2010-06-24 | Fanuc Ltd | Calibrating device for calibration and measurement system comprising calibration device |
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