JP2002267427A - Method and device for measuring outer shape of honeycomb structure - Google Patents
Method and device for measuring outer shape of honeycomb structureInfo
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- JP2002267427A JP2002267427A JP2001071913A JP2001071913A JP2002267427A JP 2002267427 A JP2002267427 A JP 2002267427A JP 2001071913 A JP2001071913 A JP 2001071913A JP 2001071913 A JP2001071913 A JP 2001071913A JP 2002267427 A JP2002267427 A JP 2002267427A
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- image
- honeycomb structure
- measuring
- wall portion
- outer shape
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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
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/956—Inspecting patterns on the surface of objects
- G01N21/95692—Patterns showing hole parts, e.g. honeycomb filtering structures
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Image Processing (AREA)
- Image Analysis (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ハニカム構造体の
外形状を画像処理技術を用いて検査するためのハニカム
構造体の外形状測定方法及びその方法を実施する装置に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the outer shape of a honeycomb structure for inspecting the outer shape of the honeycomb structure using an image processing technique, and an apparatus for implementing the method.
【０００２】[0002]
【従来の技術】ハニカム構造体は、例えばセラミック原
料を焼結助材等とともに混合して坏土を得、得られた坏
土を口金により押出成形後焼成することで作製される。
図５にその一例を示すように、このようにして得られた
ハニカム構造体５１は、円筒形の外壁５２内に隔壁５３
により一端面から他端面まで延びる複数の貫通孔５４を
有しており、四辺を隔壁５３で囲まれた最小単位の部分
をセルと呼ぶ。2. Description of the Related Art A honeycomb structure is produced by, for example, mixing a ceramic raw material with a sintering aid and the like to obtain a kneaded material, extruding the obtained kneaded material with a die, and then firing.
As shown in an example in FIG. 5, the honeycomb structure 51 thus obtained is provided with a partition wall 53 inside a cylindrical outer wall 52.
Has a plurality of through-holes 54 extending from one end face to the other end face, and a minimum unit portion surrounded by partition walls 53 on four sides is called a cell.
【０００３】上述したハニカム構造体５１は、装置等に
組み込まれて使用される。そのため、ハニカム構造体５
１の端面における直径等の外形状を測定する必要があ
る。従来、上述したハニカム構造体５１の外形状の測定
は、ハニカム構造体５１の端面を撮像装置で撮像し、撮
像して得た原画像に対しエッジ検出処理等の画像処理を
行うことで、実施されていた。すなわち、ハニカム構造
体５１の外壁５２の部分では隣接する画素の輝度変化が
大きくエッジ状になっているため、エッジ検出処理等の
従来から知られている画像処理技術を使用することによ
り、エッジ位置を検出することで外壁部分の位置を求
め、求めた外壁部分の位置に基づき外形状を求めてい
た。The above-described honeycomb structure 51 is used by being incorporated in an apparatus or the like. Therefore, the honeycomb structure 5
It is necessary to measure the outer shape, such as the diameter, at the end face of No. 1. Conventionally, the above-described measurement of the outer shape of the honeycomb structure 51 is performed by imaging an end face of the honeycomb structure 51 with an imaging device and performing image processing such as edge detection processing on an original image obtained by imaging. It had been. That is, in the outer wall 52 of the honeycomb structure 51, since the luminance change of the adjacent pixels is largely edge-shaped, the edge position can be determined by using a conventionally known image processing technique such as edge detection processing. Is detected, the position of the outer wall portion is obtained, and the outer shape is obtained based on the obtained position of the outer wall portion.
【０００４】また、他の例として、エッジ検出処理を行
う領域を外壁５２の近傍のみに限定して測定精度を向上
させる技術も知られている。図６は従来のハニカム構造
体の外形状測定方法のうち画像処理する領域をマスクに
より外壁部分近傍に限定する例を説明するためのフロー
チャートである。図６に従ってその方法を説明すると、
まず、ハニカム構造体の端面を撮像して原画像を得る
（ステップ５１）。次に、原画像を２値化して２値画像
を得る（ステップ５２）。次に、２値画像のうちハニカ
ム構造体の内部を塗り潰し、例えば内部が「１」で外部
が「０」のように塗り潰し、マスク画像を得る（ステッ
プ５３）。次に、得られたマスク画像の外壁部分言い換
えると「１」と「０」との境界を、ハニカム構造体の端
面において径方向に例えば１５画素分膨張させた膨張マ
スク画像を得る（ステップ５４）とともに、ハニカム構
造体の端面において径方向に例えば１５画素分縮退させ
た縮退マスク画像を得る（ステップ５５）。次に、得ら
れた膨張マスク画像と縮退マスク画像との差をとり、膨
張マスク画像の外壁部分と縮退マスク画像の外壁部分と
の間をエッジ検出処理をすべきエッジ検出領域として求
める（ステップ５６）。そして、原画像のうち求めたエ
ッジ検出領域に対応する部分に対しエッジ検出処理を行
い、原画像のエッジ検出領域内に存在するエッジを検出
し、画像上の位置情報（ｘ（ｉ）、ｙ（ｉ）で定義され
る）としてエッジの位置を外壁の位置として求め、種々
の外形状例えば直径を求める。[0004] As another example, a technique for improving the measurement accuracy by limiting the area in which the edge detection processing is performed to only the vicinity of the outer wall 52 is known. FIG. 6 is a flowchart for explaining an example of a conventional method for measuring the outer shape of a honeycomb structure, in which an area for image processing is limited to the vicinity of an outer wall portion by a mask. The method will be described with reference to FIG.
First, an end image of the honeycomb structure is imaged to obtain an original image (step 51). Next, the original image is binarized to obtain a binary image (step 52). Next, the inside of the honeycomb structure in the binary image is painted out, for example, the inside is painted out as “1” and the outside is painted out as “0” to obtain a mask image (step 53). Next, an expanded mask image is obtained by expanding the outer wall portion of the obtained mask image, in other words, the boundary between "1" and "0" by, for example, 15 pixels in the radial direction at the end face of the honeycomb structure (step 54). At the same time, on the end face of the honeycomb structure, a contracted mask image is contracted in the radial direction by, for example, 15 pixels (step 55). Next, the difference between the obtained dilated mask image and the degenerated mask image is obtained, and the area between the outer wall portion of the dilated mask image and the outer wall portion of the degenerated mask image is determined as an edge detection area to be subjected to edge detection processing (step 56). ). Then, an edge detection process is performed on a portion of the original image corresponding to the obtained edge detection region, an edge present in the edge detection region of the original image is detected, and position information (x (i), y (Defined in (i)), the position of the edge is obtained as the position of the outer wall, and various outer shapes, for example, diameters are obtained.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上述し
た従来のハニカム構造体の外形状測定方法に従って外形
状を測定すると、測定結果に測定対象の外形状とは関係
のない規則性を伴った凹凸が出る問題が発生した。図７
（ａ）、（ｂ）はそれぞれ直径１００ｍｍのハニカム構
造体の端面における測定結果を示すグラフである。その
誤差の大きさは原画像において最大で１画素分にも相当
するもので、測定精度を悪化させる原因となっていた。However, when the outer shape is measured according to the above-mentioned conventional method for measuring the outer shape of a honeycomb structure, irregularities having regularity unrelated to the outer shape of the object to be measured are found in the measurement result. A problem has occurred. FIG.
(A), (b) is a graph which shows the measurement result in the end surface of a 100-mm-diameter honeycomb structure. The magnitude of the error is equivalent to a maximum of one pixel in the original image, which causes the measurement accuracy to deteriorate.
【０００６】本発明の目的は上述した課題を解消して、
測定精度を向上させることのできるハニカム構造体の外
形状測定方法及び装置を提供しようとするものである。An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a method and an apparatus for measuring the outer shape of a honeycomb structure, which can improve measurement accuracy.
【０００７】[0007]
【課題を解決するための手段】本発明のハニカム構造体
の外形状測定方法は、ハニカム構造体の端面を撮像して
原画像を求め、求めた原画像中におけるハニカム構造体
の外壁部分の平均輝度を求め、原画像上で、ハニカム構
造体の内部を、求めた平均輝度の階調で塗り潰した塗り
潰し画像を求め、求めた塗り潰し画像に対しエッジ検出
処理をすることにより外形状を測定することを特徴とす
るものである。According to the method for measuring the outer shape of a honeycomb structure of the present invention, an original image is obtained by imaging an end face of the honeycomb structure, and the average of the outer wall portion of the honeycomb structure in the obtained original image is obtained. Obtain luminance, obtain a filled image in which the inside of the honeycomb structure is filled with the obtained average luminance gradation on the original image, and measure the outer shape by performing edge detection processing on the obtained filled image. It is characterized by the following.
【０００８】本発明者らが上記従来の課題を検討したと
ころ、測定精度悪化に影響しているのは検出しようとし
ているエッジ部の内側がセル構造になっていることに起
因することが明らかになってきた。一般的な測定におい
ては内部が一様な明るさをもった領域であるが、ハニカ
ム構造体では内部の大部分が暗いセル部であり、これが
エッジ部検出に悪影響を及ぼしている。本発明では、ハ
ニカム構造体の内部を外壁部分の平均輝度の階調で塗り
潰すことで、エッジ検出処理をする際の外壁部分以外の
部分の影響、特に、外壁部分とは輝度が大きく異なるハ
ニカム構造体内部のセル部分の影響をなくすことがで
き、エッジ検出を精度良く実施することができる。その
結果、ハニカム構造体の外形状測定における測定精度を
向上させることができる。The inventors of the present invention have examined the above-mentioned conventional problems and found that the reason for the deterioration of the measurement accuracy is that the inside of the edge portion to be detected has a cell structure. It has become. In a general measurement, the inside is a region having uniform brightness, but in the honeycomb structure, most of the inside is a dark cell portion, which has an adverse effect on edge portion detection. In the present invention, the inside of the honeycomb structure is filled with the gradation of the average luminance of the outer wall portion, so that the effect of the portion other than the outer wall portion when performing the edge detection processing, particularly, the honeycomb having a luminance greatly different from the outer wall portion. The influence of the cell portion inside the structure can be eliminated, and edge detection can be performed with high accuracy. As a result, the measurement accuracy in measuring the outer shape of the honeycomb structure can be improved.
【０００９】本発明の好適な実施態様としては、塗り潰
し画像のうち、外壁部分周辺の外壁部分を含むリング状
の領域の領域抽出画像に対しエッジ検出処理を行う事が
ある。この場合は、外壁部分以外の部分の影響をさらに
少なくすることができるため好ましい。In a preferred embodiment of the present invention, edge detection processing is performed on a region-extracted image of a ring-shaped region including the outer wall portion around the outer wall portion in the solid image. This case is preferable because the influence of the portion other than the outer wall portion can be further reduced.
【００１０】また、外壁部分の平均輝度の算出を、原画
像を２値化して２値画像を求め、求めた２値画像上でハ
ニカム構造体の内部を塗り潰してマスク画像を求め、求
めたマスク画像に対し、ハニカム構造体の外壁部分を、
一定の割合で膨張させた膨張マスク画像と、一定の割合
で縮退させた縮退マスク画像とを求め、求めた膨張マス
ク画像の外壁部分と縮退マスク画像の外壁部分との間を
平均輝度を算出すべき外壁領域とする外壁領域マスク画
像を求め、原画像に求めた外壁領域マスク画像をマスク
して、原画像のうち外壁部分を含む外壁領域内の画素の
平均から平均輝度を求めることがある。この場合は、外
壁部分の平均輝度の算出を精度良く実施することができ
るため好ましい。The average brightness of the outer wall portion is calculated by binarizing the original image to obtain a binary image, and filling the interior of the honeycomb structure on the obtained binary image to obtain a mask image. For the image, the outer wall of the honeycomb structure
A dilated mask image expanded at a fixed rate and a degenerated mask image degenerated at a fixed rate are obtained, and an average luminance is calculated between the outer wall part of the obtained dilated mask image and the outer wall part of the degenerated mask image. There is a case where an outer wall region mask image as a power outer wall region is obtained, the outer wall region mask image obtained as the original image is masked, and an average luminance is obtained from an average of pixels in the outer wall region including the outer wall portion in the original image. This case is preferable because the average luminance of the outer wall portion can be calculated with high accuracy.
【００１１】本発明のハニカム構造体の外形状測定装置
は、上述したハニカム構造体の外形状測定方法を実施す
るための装置であって、ハニカム構造体の端面を撮像す
るための撮像装置と、撮像装置で撮像した端面の原画像
を画像処理してハニカム構造体の外形状を測定するため
の画像処理装置とを備えることを特徴とするものであ
る。本発明の外形状測定装置では、上述したハニカム構
造体の外形状測定方法を好適に実施することができる。An apparatus for measuring an outer shape of a honeycomb structure according to the present invention is an apparatus for performing the above-described method for measuring an outer shape of a honeycomb structure, comprising: an imaging device for imaging an end face of the honeycomb structure; An image processing device is provided for processing the original image of the end face taken by the imaging device and measuring the outer shape of the honeycomb structure. In the outer shape measuring device of the present invention, the above-described method for measuring the outer shape of the honeycomb structure can be suitably performed.
【００１２】本発明の装置の好適な実施態様としては、
撮像装置が、ＣＣＤカメラとテレセントリックレンズと
から構成される。この場合は、原画像の品質を高くする
ことができ、結果として測定精度を向上させることがで
きるため好ましい。In a preferred embodiment of the apparatus of the present invention,
The imaging device includes a CCD camera and a telecentric lens. This case is preferable because the quality of the original image can be increased, and as a result, the measurement accuracy can be improved.
【００１３】[0013]
【発明の実施の形態】図１は本発明のハニカム構造体の
外形状測定方法を実施する装置の一例の構成を示す図で
ある。図１に示す例において、本発明の外形状測定装置
は、基台１上のハニカム構造体２の端面を撮像するため
の撮像装置３と、撮像装置３で撮像した端面の原画像を
画像処理してハニカム構造体２の外形状を測定するため
の画像処理装置４とを備えている。撮像装置３は、ＣＣ
Ｄカメラ１１とレンズに垂直に入射する光のみを取り込
むテレセントリックレンズ１２とを組み合わせて構成さ
れている。なお、１３は照明である。また、画像処理装
置４は、画像処理ボード２１を備えるパーソナル・コン
ピュータ２２と画像処理の状況を表示する表示装置２３
とから構成されている。ハニカム構造体２の構成は従来
例と同様である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing the configuration of an example of an apparatus for implementing a method for measuring the outer shape of a honeycomb structure according to the present invention. In the example shown in FIG. 1, an outer shape measurement device of the present invention includes an imaging device 3 for imaging an end face of a honeycomb structure 2 on a base 1 and an image processing of an original image of the end face imaged by the imaging device 3. And an image processing device 4 for measuring the outer shape of the honeycomb structure 2. The imaging device 3 has a CC
It is configured by combining a D camera 11 and a telecentric lens 12 that captures only light that is perpendicularly incident on the lens. In addition, 13 is illumination. The image processing device 4 includes a personal computer 22 having an image processing board 21 and a display device 23 for displaying the status of image processing.
It is composed of The configuration of the honeycomb structure 2 is the same as the conventional example.
【００１４】図２は本発明のハニカム構造体の外形状測
定方法の一例を説明するためのフローチャートである。
以下、図２に示すフローチャートに従って本発明のハニ
カム構造体の外形状測定方法を説明する。FIG. 2 is a flowchart for explaining an example of the method for measuring the outer shape of a honeycomb structure according to the present invention.
Hereinafter, the method for measuring the outer shape of the honeycomb structure of the present invention will be described with reference to the flowchart shown in FIG.
【００１５】まず、図２においてステップ１〜ステップ
６により従来と同様にエッジ検出処理を行う外壁近傍の
リング状のエッジ検出領域を抽出する。すなわち、ま
ず、ハニカム構造体の端面を撮像して原画像を得る（ス
テップ１）。次に、原画像を２値化して２値画像を得る
（ステップ２）。次に、２値画像のうちハニカム構造体
の内部を塗り潰し、例えば内部が「１」で外部が「０」
のように塗り潰し、マスク画像を得る（ステップ３）。
次に、得られたマスク画像の外壁部分言い換えると
「１」と「０」との境界を、ハニカム構造体の端面にお
いて径方向に例えば１５画素分膨張させた膨張マスク画
像（１）を得る（ステップ４）とともに、ハニカム構造
体の端面において径方向に例えば１５画素分縮退させた
縮退マスク画像（１）を得る（ステップ５）。次に、得
られた膨張マスク画像（１）と縮退マスク画像（１）と
の差をとり、膨張マスク画像（１）の外壁部分と縮退マ
スク画像（１）の外壁部分との間の領域をエッジ検出処
理をすべきエッジ検出領域として求める（ステップ
６）。First, in FIG. 2, a ring-shaped edge detection area near the outer wall on which edge detection processing is performed in the same manner as in the prior art is extracted in steps 1 to 6. That is, first, an end face of the honeycomb structure is imaged to obtain an original image (step 1). Next, a binary image is obtained by binarizing the original image (step 2). Next, the inside of the honeycomb structure in the binary image is filled, for example, the inside is “1” and the outside is “0”.
To obtain a mask image (step 3).
Next, an expanded mask image (1) is obtained in which the boundary between “1” and “0” is expanded in the end face of the honeycomb structure by, for example, 15 pixels in the radial direction at the outer wall portion of the obtained mask image ( At the same time as step 4), a contracted mask image (1) is contracted by, for example, 15 pixels in the radial direction on the end face of the honeycomb structure (step 5). Next, the difference between the obtained dilated mask image (1) and the degenerated mask image (1) is calculated, and the area between the outer wall part of the dilated mask image (1) and the outer wall part of the degenerated mask image (1) is calculated. It is determined as an edge detection area to be subjected to edge detection processing (step 6).
【００１６】次に、図２においてステップ７〜ステップ
１２によりハニカム構造体の内部を外壁部分の平均輝度
の階調に塗り潰した画像を得る。すなわち、まず、ステ
ップ３で得られたマスク画像の外壁部分を、ハニカム構
造体の端面において径方向に一定の画素分例えば１．５
画素分膨張させた膨張マスク画像（２）を得る（ステッ
プ７）とともに、ハニカム構造体の端面において径方向
に一定の画素分例えば２．５画素分縮退させた縮退マス
ク画像（２）を得る（ステップ８）。Next, in FIG. 2, an image in which the inside of the honeycomb structure is filled with the gradation of the average luminance of the outer wall portion is obtained in steps 7 to 12. That is, first, the outer wall portion of the mask image obtained in step 3 is fixed to the end face of the honeycomb structure by a certain number of pixels, for example, 1.5 pixels in the radial direction.
An expanded mask image (2) expanded by the number of pixels is obtained (step 7), and a reduced mask image (2) obtained by shrinking the end face of the honeycomb structure by a fixed number of pixels, for example, 2.5 pixels, in the radial direction is obtained (step 7). Step 8).
【００１７】ここで、膨張マスク画像（２）の膨張量及
び縮退マスク画像（２）の縮退量は、ステップ４の膨張
マスク画像（１）の膨張量及びステップ５の縮退マスク
画像（１）の縮退量に比べ、それぞれ大幅に少ない。こ
れは、膨張マスク画像（１）と縮退マスク画像（１）と
から求めるエッジ検出領域は例えば３×３とか５×５の
微分オペレータを使用するためある程度の幅が必要なの
に対し、膨張マスク画像（２）と縮退マスク画像（２）
とから求める、外壁部分の平均輝度を求める際に使用す
る領域の幅は、外壁の幅とほぼ同じ程度である必要があ
り、外壁部分の幅である数画素の幅に対応させる必要が
あるためである。これらのエッジ検出領域及び外壁部分
の平均輝度を求める際に使用する領域の設定、すなわ
ち、それぞれの膨張量及び縮退量の設定は、個々のハニ
カム構造体の形状に合わせてその幅を設定する必要があ
る。Here, the amount of expansion of the dilated mask image (2) and the amount of reduction of the reduced mask image (2) are determined by the amount of expansion of the expanded mask image (1) in step 4 and the amount of expansion of the reduced mask image (1) in step 5. Each is significantly less than the amount of degeneration. This is because the edge detection area obtained from the dilated mask image (1) and the reduced mask image (1) needs a certain width, for example, because a 3 × 3 or 5 × 5 differential operator is used. 2) and degenerated mask image (2)
The width of the area used when calculating the average luminance of the outer wall portion needs to be approximately the same as the width of the outer wall, and it is necessary to correspond to the width of several pixels which is the width of the outer wall portion. It is. The setting of the area used for calculating the average luminance of the edge detection area and the outer wall portion, that is, the setting of the amount of expansion and the amount of contraction, requires setting the width according to the shape of each honeycomb structure. There is.
【００１８】次に、膨張マスク画像（２）と縮退マスク
画像（２）との差をとり、膨張マスク画像（２）の外壁
部分と縮退マスク画像（２）の外壁部分との間の領域を
外壁輝度算出領域として求める（ステップ９）。次に、
ステップ１の原画像のうち求めた外壁輝度算出領域に対
応する部分に対し平均輝度Ｂａｖｅを算出する（ステッ
プ１０）。次に、ステップ８で求めた縮退マスク画像
（２）の内部を平均輝度Ｂａｖｅに対応する階調（例え
ば原画像が０〜２５５の階調であれば、そのうちの平均
輝度Ｂａｖｅが対応するいずれかの階調）で塗り潰し、
内部以外の部分を０（０〜２５５のうちの０階調）とし
た、塗り潰し用画像を求める（ステップ１１）。次に、
ステップ１の原画像とステップ１１の塗り潰し用画像と
の比較を各画素毎に行い、階調の大きい方を選択し、処
理後画像を求める（ステップ１２）。Next, the difference between the dilated mask image (2) and the reduced mask image (2) is calculated, and the area between the outer wall portion of the dilated mask image (2) and the outer wall portion of the reduced mask image (2) is determined. It is determined as an outer wall luminance calculation area (step 9). next,
An average luminance Bave is calculated for a portion of the original image of Step 1 corresponding to the calculated outer wall luminance calculation area (Step 10). Next, the inside of the degenerated mask image (2) obtained in step 8 has a gradation corresponding to the average luminance Bave (for example, if the original image has a gradation of 0 to 255, any of the gradations corresponding to the average luminance Bave) Fill) with
A fill-in image is obtained in which a portion other than the inside is set to 0 (0 gradation from 0 to 255) (step 11). next,
A comparison is made between the original image of step 1 and the image for filling in step 11 for each pixel, the one with the larger gradation is selected, and the processed image is obtained (step 12).
【００１９】そして、ステップ１２で求めた処理後画像
のうち、ステップ６で求めたエッジ検出領域に対応する
部分に対しエッジ検出処理を行い、処理後画像のエッジ
検出領域内に存在するエッジを検出し、画像上の位置情
報（ｘ（ｉ）、ｙ（ｉ）で定義される）としてエッジの
位置を外壁の位置として求め、種々の外形状例えば直径
を求める。Then, of the processed image obtained in step 12, an edge detection process is performed on a portion corresponding to the edge detection area obtained in step 6, and an edge existing in the edge detection area of the processed image is detected. Then, as the position information on the image (defined by x (i) and y (i)), the position of the edge is obtained as the position of the outer wall, and various outer shapes such as diameters are obtained.
【００２０】なお、上述した実施例において、ステップ
１〜ステップ６のエッジ検出処理は必須ではなく、内部
をＢａｖｅで塗り潰した全画像に対してエッジ検出処理
を行っても良い。In the above-described embodiment, the edge detection processing in steps 1 to 6 is not essential, and the edge detection processing may be performed on all the images whose interior is filled with Bave.
【００２１】また、上述した本発明のハニカム構造体の
外形状測定方法の各ステップのうち、図３にステップ１
の原画像の例とその明暗の等高線図を示すとともに、図
４にステップ１１の塗り潰し用画像の例とその明暗の等
高線図を示す。FIG. 3 shows step 1 of the steps of the method for measuring the outer shape of a honeycomb structure according to the present invention.
FIG. 4 shows an example of the original image and the contour map of the contrast thereof, and FIG. 4 shows an example of the image for filling in step 11 and the contour map of the contrast thereof.
【００２２】[0022]
【発明の効果】以上の説明から明らかなように、本発明
によれば、ハニカム構造体の内部を外壁部分の平均輝度
の階調で塗り潰しているため、エッジ検出処理をする際
の外壁部分以外の部分の影響、特に、外壁部分とは輝度
が大きく異なるハニカム構造体内部のセル部分の影響を
なくすことができる。また、塗潰しは外壁のわずかに内
側にとどめ、かつ外壁平均輝度より明るい部分は塗潰さ
ないため、外壁の画像情報を傷つけることがなく、エッ
ジ検出を精度良く実施することができる。結果、ハニカ
ム構造体の外形状測定における測定精度を向上させるこ
とができる。As is apparent from the above description, according to the present invention, since the inside of the honeycomb structure is filled with the gradation of the average luminance of the outer wall portion, the portion other than the outer wall portion at the time of performing the edge detection processing. In particular, the influence of the cell portion inside the honeycomb structure having a luminance that is significantly different from that of the outer wall portion can be eliminated. In addition, since the paint is kept slightly inside the outer wall and a portion brighter than the average brightness of the outer wall is not painted, the edge information can be accurately detected without damaging the image information of the outer wall. As a result, it is possible to improve the measurement accuracy in measuring the outer shape of the honeycomb structure.
【図１】本発明のハニカム構造体の外形状測定方法を実
施する装置の一例の構成を示す図である。FIG. 1 is a diagram showing a configuration of an example of an apparatus for implementing a method for measuring an outer shape of a honeycomb structure of the present invention.
【図２】本発明のハニカム構造体の外形状測定方法の一
例を説明するためのフローチャートである。FIG. 2 is a flowchart illustrating an example of a method for measuring an outer shape of a honeycomb structure according to the present invention.
【図３】図２のフローチャートにおけるステップ１の原
画像の例とその明暗の等高線図を示す図である。FIG. 3 is a diagram showing an example of an original image of step 1 in the flowchart of FIG. 2 and a contour map of its brightness.
【図４】図２のフローチャートにおけるステップ１１の
塗り潰し用画像の例とその明暗の等高線図を示す図であ
る。FIG. 4 is a diagram showing an example of an image for filling in step 11 in the flowchart of FIG. 2 and a contour map of light and shade thereof.
【図５】ハニカム構造体の一例の構成を示す図である。FIG. 5 is a diagram illustrating a configuration of an example of a honeycomb structure.
【図６】従来のハニカム構造体の外形状測定方法のうち
画像処理する領域をマスクにより外壁部分近傍に限定す
る例を説明するためのフローチャートである。FIG. 6 is a flowchart illustrating an example of a conventional method for measuring the outer shape of a honeycomb structure, in which an area to be subjected to image processing is limited to a portion near an outer wall portion by a mask.
【図７】（ａ）、（ｂ）はそれぞれ従来方法における直
径１００ｍｍのハニカム構造体の端面における測定結果
を示すグラフであり、（ｂ）では誤差を100倍に強調し
表示している。FIGS. 7 (a) and 7 (b) are graphs showing measurement results at the end face of a honeycomb structure having a diameter of 100 mm in the conventional method, and in FIG. 7 (b), errors are emphasized 100 times and displayed.
１ 基台、２ ハニカム構造体、３ 撮像装置、４ 画
像処理装置、１１ ＣＣＤカメラ、１２ テレセントリ
ックレンズ、１３ 照明、２１ 画像処理ボード、２２
パーソナル・コンピュータ、２３ 表示装置Reference Signs List 1 base, 2 honeycomb structure, 3 imaging device, 4 image processing device, 11 CCD camera, 12 telecentric lens, 13 illumination, 21 image processing board, 22
Personal computer, 23 display device
───────────────────────────────────────────────────── フロントページの続き (72)発明者 吉田 信也 愛知県名古屋市瑞穂区須田町２番56号 日 本碍子株式会社内 Ｆターム(参考） 2F065 AA12 AA26 AA45 CC00 FF04 JJ03 JJ26 LL59 QQ04 QQ31 QQ42 5B057 CA08 CB06 CE12 CE20 DA20 DB08 DC16 5L096 EA02 EA43 FA06 GA08 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinya Yoshida 2-56, Suda-cho, Mizuho-ku, Nagoya-shi, Aichi F-term (reference) in Japan Insulators Co., Ltd. 2F065 AA12 AA26 AA45 CC00 FF04 JJ03 JJ26 LL59 QQ04 QQ31 QQ42 5B057 CA08 CB06 CE12 CE20 DA20 DB08 DC16 5L096 EA02 EA43 FA06 GA08
Claims (5)
求め、求めた原画像中におけるハニカム構造体の外壁部
分の平均輝度を求め、原画像上で、ハニカム構造体の内
部を、求めた平均輝度の階調で塗り潰した塗り潰し画像
を求め、求めた塗り潰し画像に対しエッジ検出処理をす
ることにより外形状を測定することを特徴とするハニカ
ム構造体の外形状測定方法。An original image is obtained by imaging an end face of a honeycomb structure, an average luminance of an outer wall portion of the honeycomb structure in the obtained original image is obtained, and an inside of the honeycomb structure is obtained on the original image. A method for measuring an outer shape of a honeycomb structure, comprising: obtaining a filled image filled with a gradation of average luminance, and measuring an outer shape by performing edge detection processing on the obtained filled image.
外壁部分を含むリング状の領域の領域抽出画像に対しエ
ッジ検出処理を行う請求項１記載のハニカム構造体の外
形状測定方法。2. The method for measuring an outer shape of a honeycomb structure according to claim 1, wherein an edge detection process is performed on a region-extracted image of a ring-shaped region including an outer wall portion around the outer wall portion in the solid image.
マスク画像を求め、 求めたマスク画像に対し、ハニカム構造体の外壁部分
を、一定の割合で膨張させた膨張マスク画像と、一定の
割合で縮退させた縮退マスク画像とを求め、 求めた膨張マスク画像の外壁部分と縮退マスク画像の外
壁部分との間を平均輝度を算出すべき外壁領域とする外
壁領域マスク画像を求め、 原画像に求めた外壁領域マスク画像をマスクして、原画
像のうち外壁部分を含む外壁領域内の画素の平均から平
均輝度を求める請求項１または２記載のハニカム構造体
の外形状測定方法。3. The average luminance of the outer wall portion is calculated by binarizing the original image to obtain a binary image, and filling the interior of the honeycomb structure on the obtained binary image to obtain a mask image. From the mask image, an expanded mask image obtained by expanding the outer wall portion of the honeycomb structure at a fixed rate and a reduced mask image obtained by reducing the fixed rate at a fixed rate are obtained, and the outer wall portion of the obtained expanded mask image and the reduced mask are obtained. Obtain an outer wall area mask image with an outer wall area for which an average luminance is to be calculated between the outer wall part of the image and the outer wall area mask image obtained in the original image, and mask the outer wall area mask image obtained in the original image so that the outer wall area including the outer wall part in the original image 3. The method for measuring an outer shape of a honeycomb structure according to claim 1, wherein an average luminance is obtained from an average of the pixels.
カム構造体の外形状測定方法を実施するための装置であ
って、ハニカム構造体の端面を撮像するための撮像装置
と、撮像装置で撮像した端面の原画像を画像処理してハ
ニカム構造体の外形状を測定するための画像処理装置と
を備えることを特徴とするハニカム構造体の外形状測定
装置。4. An apparatus for performing the method for measuring the outer shape of a honeycomb structure according to claim 1, wherein the imaging apparatus is configured to image an end face of the honeycomb structure. An external shape measuring device for a honeycomb structure, comprising: an image processing device for processing an original image of an end face imaged by an imaging device to measure an external shape of the honeycomb structure.
トリックレンズとからなる請求項４記載のハニカム構造
体の外形状検査装置。5. The apparatus for inspecting the outer shape of a honeycomb structure according to claim 4, wherein said imaging device comprises a CCD camera and a telecentric lens.
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| JP2001071913A JP4257720B2 (en) | 2001-03-14 | 2001-03-14 | Method and apparatus for measuring outer shape of honeycomb structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001071913A JP4257720B2 (en) | 2001-03-14 | 2001-03-14 | Method and apparatus for measuring outer shape of honeycomb structure |
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| JP4257720B2 JP4257720B2 (en) | 2009-04-22 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1813909A1 (en) * | 2006-01-30 | 2007-08-01 | Ibiden Co., Ltd. | Method for inspecting honeycomb structured body and method for manufacturing honeycomb structured body |
| WO2011060012A1 (en) * | 2009-11-13 | 2011-05-19 | Corning Incorporated | High-resolution large-field scanning inspection system for extruded ceramic honeycomb structures |
| JP2014028509A (en) * | 2012-06-27 | 2014-02-13 | Ngk Insulators Ltd | Method for producing ceramic honeycomb structure |
| JP2018524564A (en) * | 2015-05-21 | 2018-08-30 | コーニング インコーポレイテッド | Inspection method for cellular articles |
| CN111583242A (en) * | 2020-05-09 | 2020-08-25 | 中南大学 | Morphological vertex extraction method and detection device for detecting cellular regularity |
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2001
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|---|---|---|---|---|
| EP1813909A1 (en) * | 2006-01-30 | 2007-08-01 | Ibiden Co., Ltd. | Method for inspecting honeycomb structured body and method for manufacturing honeycomb structured body |
| US7922963B2 (en) | 2006-01-30 | 2011-04-12 | Ibiden Co., Ltd | Method for inspecting honeycomb structured body and method for manufacturing honeycomb structured body |
| WO2011060012A1 (en) * | 2009-11-13 | 2011-05-19 | Corning Incorporated | High-resolution large-field scanning inspection system for extruded ceramic honeycomb structures |
| CN102639990A (en) * | 2009-11-13 | 2012-08-15 | 康宁股份有限公司 | High-resolution large-field scanning inspection system for extruded ceramic honeycomb structures |
| US8285027B2 (en) | 2009-11-13 | 2012-10-09 | Corning Incorporated | High-resolution large-field scanning inspection system for extruded ceramic honeycomb structures |
| JP2014028509A (en) * | 2012-06-27 | 2014-02-13 | Ngk Insulators Ltd | Method for producing ceramic honeycomb structure |
| JP2018524564A (en) * | 2015-05-21 | 2018-08-30 | コーニング インコーポレイテッド | Inspection method for cellular articles |
| US10769772B2 (en) | 2015-05-21 | 2020-09-08 | Corning Incorporated | Methods for inspecting cellular articles |
| CN111583242A (en) * | 2020-05-09 | 2020-08-25 | 中南大学 | Morphological vertex extraction method and detection device for detecting cellular regularity |
| CN111583242B (en) * | 2020-05-09 | 2023-05-23 | 中南大学 | Morphological vertex extraction method and detection device for honeycomb regularity detection |
| DE102022000550A1 (en) | 2021-03-26 | 2022-09-29 | NGK lnsulators, Ltd. | Method of manufacturing a columnar honeycomb fuel body |
| DE102023000493A1 (en) | 2022-03-31 | 2023-10-05 | Ngk Insulators, Ltd. | Process for producing a cylindrical fired honeycomb body |
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