JP2003004423A - Inspection apparatus and method of tip sectional surface shape of work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the inspection technique of the cut-surface shape of a work tip that can determine not only a horizontal surface but also a surface that is inclined obliquely as a conforming article, if the sectional surface of the work tip is smooth, and can determine a surface as a non-conforming article, if the sectional surface of the work tip is not smooth, non-conforming sections such as projections and recesses are formed, and a curved surface is gentle. SOLUTION: The inspection apparatus comprises a work edge position detection means 11 for detecting n-point edge positions P1 (X1 ,Y)-Pn (Xn ,Yn ) on the tip sectional surface of a work (w), a storage region for storing criterion distance Sd and the number of edge detection SL, a determination straight line creation means 12 for creating determination straight lines fK(QK,QK+ SL)(k=1,2,..., n-SL) for connecting two points (QK,QK+ SL), that are separated each other with the number of edge detection SL among Q1 (X1 +Sd,Y1 ) to Qn (Xn +Sd,Yn ).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection device and an inspection method for a shape of a tip cut surface of a work.

[0002]

2. Description of the Related Art FIG. 11 is a layout view of a conventional inspection device for the shape of the tip cut surface of a work, in which (A) is a plan view and (B) is a front view. As shown in the figure, in the conventional inspection device for the shape of the cut end surface of a work, a work w such as a resin tube or a glass tube is vertically supported by a support base 101. The illumination 2 is arranged toward the tip (upper end) of the work w and at the same height. On the extension line of the straight line connecting the illumination 2 and the tip of the work w, the work w
The CCD camera 3 is arranged at the same height as the tip of the CCD camera 3 with its lens oriented horizontally. Therefore, the light of the illumination 2 is blocked by the tip of the work w, and its shadow is scanned (scanned) by the CCD camera 3 as an image. The image scanned by the CCD camera 3 is transmitted as image data to the work shape determination device 4 such as a computer and displayed on the monitor M. Therefore, by checking the shape of the shadow of the tip of the work w displayed on the monitor M, it is possible to inspect whether the work w is a good product or a defective product.

As a method for automatically detecting whether or not there is a defective portion at the tip of the work w, a step-based detection method is known. As shown in FIG. 12, the detection method based on this step detects components X1 to Xn in the X-axis direction at intersections where the outer edge of the tip of the work w and a plurality of equally spaced scanning lines E1 to En intersect. Step Dk = | Xk-Xk + m | (k = 1,
2, 3, ..., Nm) (m is an arbitrary value), and whether the work w is a good product or a defective product is determined by whether each step Dk exceeds a threshold value α.

[0004]

However, the conventional method for inspecting the cut surface shape by the step has the following problems (i) to (iii). (i) FIG. 13 (A) is an inspection correlation diagram showing the relationship between the determination by the conventional method of detecting a step and the true shape of the cut surface of the work w. As shown in FIG. 13 (A), when the front end surface of the work w is a horizontal surface, it can be determined as a defective product if there is a defective portion on the cut surface, and can be determined as a good product if there is no defective portion. Further, when the cut surface of the work w is an inclined surface, it can be determined as a good product if there is no defect. However, when the cut surface of the workpiece w is an inclined surface, defective parts such as projections such as chips and dust and dents such as cutting scratches may be determined to be good. This is because, as shown in FIG. 13 (B), when the defective portion of the cut surface of the work w is directed to the CCD camera 3 side, the defective portion is hidden in the shadow, and the shadow is convex or concave. This is because it does not have the shape of. For this reason, there is an error that it is determined as a non-defective product even though there is a defective portion on the cut surface of the work w. (ii) In the conventional inspection method using a step, if the scanning line Eb is not properly aligned with the apex of the protrusion as shown in FIG. 14 (A), the step D between Xa and Xb becomes an actual step. It becomes small compared to. Furthermore, as shown in FIG. 14 (B),
If there is a protrusion between the scanning lines Ea and Eb, Xb and X
The step between c and c is 0, and even a protrusion or the like cannot be detected. (iii) However, if the interval between the scanning lines Ea and Eb is narrowed, the problem of (ii) above can be solved, but FIG.
It becomes impossible to judge a workpiece w having a curve with a gentle cutting plane as in 4 (C) as a defective product. When the interval between the scanning lines Ea and Eb is narrow, if the tip of the work w is a smooth curve, the step becomes relatively small, and even if there is a defective portion, the step D is the threshold value. This is because α will not be exceeded. Moreover, when the interval between the scanning lines Ea and Eb is narrow, the number of scanning lines increases, so that the number of times of processing increases, which causes a problem that the processing time becomes long and the memory becomes insufficient.

In view of the above situation, the present invention can judge that a work is not only a horizontal surface but also an inclined surface that is inclined as long as the cutting surface of the work is smooth, and the cutting surface of the work is inclined obliquely. Provided are an inspection device and an inspection method for a tip cutting surface shape of a work which can be determined as a defective product if a defective portion such as a protrusion or a dent is formed even on an inclined surface or if it is a gently curved surface. With the goal.

[0006]

According to a first aspect of the present invention, there is provided a device for inspecting a shape of a front end cutting surface of a work, wherein an illumination for illuminating light toward the front end cutting surface of the work to be inspected and a front end cutting surface of the work. A CCD camera for scanning the shadow of light blocked as an image and converting it to image data, and the image data sent from the CCD camera are received, and the good or defective product of the work is judged based on the image data. And a workpiece shape determining device having a workpiece shape determining system, wherein the workpiece shape determining system is n in a tip cross section of the workpiece.
Work edge position detecting means for detecting edge positions P ₁ (X ₁ , Y ₁ ) to P _n (X _n , Y _n ), a storage area for storing the judgment reference distance Sd, and the number of detected edges SL. And a position Q ₁ (X ₁ apart from the edge positions P ₁ (X ₁ , Y ₁ ) to P _n (X _n , Y _n ) in the X-axis direction by a determination reference distance Sd. +
Of n points from Sd, Y ₁ ) to Q _n (X _n + Sd, Y _n ), two points (Q _K , Q _{K + SL} ) separated from each other by the edge detection number SL in the detection section
Connecting the determination straight line _{f K (Q K, Q K} + SL) (k = 1,2, ..., n-SL) and determining the straight line generation means for generating, the determination straight line _{f K (Q K, Q K} + _SL )
.., n-SL), and a quality determination means for determining quality of the work depending on whether or not there is a pixel of the image data of the work on (k = 1, 2, ..., N-SL). According to a second aspect of the present invention, in the inspection device for the shape of the cut end surface of the work, in the invention of the first aspect, a work rotating mechanism for rotating the work around its axis is provided, and the illumination and CCD are provided.
It is characterized in that the cameras are respectively arranged at an angle θ with respect to the horizontal plane centering on the cutting plane of the workpiece. The method for inspecting the tip cutting surface shape of a work according to claim 3 is the first step of detecting edge positions P ₁ (X ₁ , Y ₁ ) to P _n (X _n , Y _n ) on both left and right sides in the tip cross section of the work. When,
Positions Q ₁ (X ₁ + Sd, Y ₁ ) to P ₁ (X ₁ , Y ₁ ) to P _n (X _n , Y _n ) apart from each other in the X-axis direction by a judgment reference distance Sd
Of the n points of Q _n (X _n + Sd, Y _n ), the decision line f _K (Q _K , Q _K , Q _K , Q _{K ,,} which connects two points (Q _K , Q _{K + SL} ) separated from each other by the edge detection number SL in the detection section The second step of creating Q _{K + SL} ) (k = 1,2, ..., n-SL) and the decision line f _K (Q _K , Q _{K + SL} ) (k = 1,2, ..., nS
L) and a third step of determining whether or not there is a pixel of image data of the work.

According to the first aspect of the invention, as the first step, the work edge position detecting means causes the edge positions P ₁ (X ₁ , Y ₁ ) to P _n (X _n , Y) of n points in the tip cross section of the work. _n ) is detected. In the second step, the determination straight line creating means separates the edge positions P ₁ (X ₁ , Y ₁ ) to P _n (X _n , Y _n ) from each other by a determination reference distance Sd in the X-axis direction Q ₁ (X ₁ + S
Among the n points of d, Y ₁ ) to Q _n (X _n + Sd, Y _n ), two points (Q _K , Q _{K + SL} ) separated from each other by a distance corresponding to the edge detection number SL in the detection section are defined as Connected judgment line f _K (Q _K , Q _{K + SL} ) (k = 1,2,
…, N-SL) is created. As a third step, the determination means determines whether or not there is a pixel of the image data of the work on the determination straight line f _K (Q _K , Q _{K + SL} ) (k = 1, 2, ..., N-SL). . Therefore, if the tip cutting surface of the work is smooth, it can be judged as a good product not only on a horizontal surface but also on an inclined surface inclined at an angle. Such as a defective part is formed,
If the curved surface is gentle, it can be determined as a defective product. According to the second aspect of the invention, when the work is rotated about its axis by the work rotating mechanism, the tip of the work can be rotated 360 ° for inspection. Moreover, the illumination and the CCD camera are arranged at an angle .theta. Above and below the horizontal plane about the workpiece. Therefore, it is possible to detect the presence or absence of a defective portion such as a protrusion or a dent even if the tip cutting surface of the work is an inclined surface that is inclined. According to the invention of claim 3, as the first step, the positions P ₁ (X ₁ , Y ₁ ) to P _n (X _n , Y _n ) of the n-point edges in the tip cross section of the work are detected. As a second step, the edge position _{P 1 (X 1, Y 1} ) ~P n (X n, Y n) position apart determination reference distance Sd in the X-axis direction from Q ₁ (X ₁ +
Of n points from Sd, Y ₁ ) to Q _n (X _n + Sd, Y _n ), two points (Q _K , Q _{K + SL} ) separated from each other by a distance corresponding to the number SL of detected edges in the detection section are Connected judgment line f _K (Q _K , Q _{K + SL} ) (k = 1,2,
…, N-SL) is created. As a third step, it is determined whether or not there is a pixel of the image data of the work on the determination line f _K (Q _K , Q _{K + SL} ) (k = 1, 2, ..., N-SL). Therefore, if the tip cutting surface of the work is smooth, it can be judged as a good product not only on a horizontal surface but also on an inclined surface inclined at an angle. If a defective portion such as is formed or a gently curved surface is formed, it can be determined as a defective product.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to the drawings. 1A and 1B are schematic diagrams of a device for inspecting the shape of a tip cut surface of a work according to the present embodiment. FIG. 1A is a plan view and FIG. 1B is a front view. In the figure, reference numeral w indicates a work. The work w is a material to be detected, for example, a resin tube or a glass tube, the tip portion of which is cut. It should be noted that the work w may be any one having a cylindrical shape and a tip end cut, and various materials can be adopted.

A device for inspecting the shape of the tip cut surface of a work (hereinafter, simply referred to as an inspection device) of the present embodiment comprises a work rotation mechanism 1, an illumination 2, a CCD camera 3, and a work shape determination device 4. . The work rotation mechanism 1
This is a device for rotating the work w around its axis.
The work w is supported in a vertical state by the work rotating mechanism 1, and the work w can be rotated about its axis. A pulse motor or the like may be used as the work rotating mechanism 1.

An illumination 2 and a CCD camera 3 are provided on both left and right sides of the front end cut surface of the work w. The illumination 2 is for illuminating light toward the tip cut surface of the work w to be inspected. The illumination 2 is preferably a known halogen, LED light source, fluorescent lamp, or the like, and is not particularly limited as long as it emits light.

A CCD camera 3 is arranged on an extension of a straight line connecting the illumination 2 and the tip of the work w. Therefore, the light of the illumination 2 is blocked by the tip of the work w,
The shadow is scanned as an image by the CCD camera 3.
The illumination 2 and the CCD camera 3 are adapted to swing up and down in conjunction with each other, and the illumination 2 and the CCD camera 3 can be adjusted to a desired angle θ from the horizontal plane. The image scanned by the CCD camera 3 is transmitted as image data to the work shape determining device 4 described below and displayed on the monitor M.

Next, the work shape determination device 4 will be described. The work shape determination device 4 uses the image data of the work w sent from the CCD camera 3 as input data, and the work w
Is a device for determining the quality of the cross-sectional shape of the tip and inspecting the work w. The work shape determination device 4 is a computer equipped with a memory capable of storing programs and data, and an arithmetic device capable of executing the programs, and a computer-readable record such as a hard disk, a DVD disc, or a CD-ROM incorporated therein. The work shape determination system 10 is recorded on the medium. The work shape determination device 4 is provided with an input interface for receiving the image data of the work w transmitted from the CCD camera 3.

Next, the work shape determination system 10 will be described. FIG. 2 is a system configuration diagram of the work shape determination system 10. As shown in the figure, the work shape determination system 10 includes a total number n of edge detection positions, an edge detection pitch C, an edge detection number SL, a determination reference distance Sd, and a threshold value ε as a data storage area.

The total edge detection position n is a storage area for storing the total number of positions when detecting the edge position of the shadow of the work w. The edge detection line pitch C is a storage area for storing adjacent edge detection intervals.
The edge detection number SL is a storage area for storing the edge detection number in the detection section among the edge detection positions of n points. The determination reference distance Sd is a reference distance when determining whether the work w is a good product or a defective product, that is, how much unevenness from the left and right edges of the cut surface of the work w is determined to be a good product. This is an area for storing data on the allowable distance. If the set value of the judgment reference distance Sd is set small, it is possible to judge with high accuracy.

The work shape determination system 10 includes a work edge position detection means 11, a determination straight line generation means 12 and a determination means 13 as a processing program.

The work edge position detecting means 11 detects edge positions P ₁ (X ₁ , Y ₁ ) to P at n points in the tip cross section of the work w.
It is a program for detecting _n (X _n , Y _n ). The value of n may be determined arbitrarily.

The determination straight line forming means 12 is arranged to detect the edge position.
Positions Q ₁ (X ₁ + Sd, Y ₁ ) -Q _n (X _n apart from P ₁ (X ₁ , Y ₁ ) -P _n (X _n , Y _n ) in the X-axis direction by the judgment reference distance Sd. + Sd, Y _n ), two points (Q _K , Q _{K + SL} ) separated from each other by a distance SL × C corresponding to the number SL of detected edges in the detection section.
This is a program for creating a decision line f _K (Q _K , Q _{K + SL} ) (k = 1, 2, ..., N-SL) that connects

The determination means 13 determines the determination line f _K (Q _K , Q _{K + SL} )
It is a program for determining whether or not there is a pixel of the image data of the work w on (k = 1, 2, ..., N-SL).

Next, a method of inspecting the tip cutting surface shape of the work by the inspection apparatus of this embodiment will be described. FIG. 3 is an explanatory diagram of a determination process by the work shape determination system 10. As shown in the figure, in the work shape determination system 10, initial values are given to the total edge detection position n, the edge detection pitch C, the edge detection number SL, the determination reference distance Sd, and the threshold value ε.

As shown in FIG. 1, when the work w is rotated about its axis by the work rotating mechanism 1, the work w is rotated.
It is possible to inspect by a work shape determination device by rotating the tip of the workpiece by 360 °. Moreover, the lighting 2 and
The CCD cameras 3 are arranged at an angle θ above and below the horizontal plane with the work w as the center. Therefore, even if the tip cutting surface of the work w is an inclined surface, it is possible to detect the presence or absence of a defective portion such as a protrusion or a dent.

As shown in FIG. 3, as the first step, the work edge position detecting means 11 causes the positions of n points of edges P ₁ (X ₁ , Y ₁ ) to P _n (X _n , in the tip cross section of the work w. Y _n )
Is detected (S1).

As the second step, the judgment line creating means 12
By the edge position P₁(X₁, Y₁) ~ P_n(X_n, Y_n)
Positions Q separated from each other by the judgment reference distance Sd in the X-axis direction₁(X₁+
Sd, Y ₁) ~ Q_n(X_n+ Sd, Y_n) N points, in the detection section
The distance SL × C corresponding to the edge detection number SL
2 points away from (Q_K, Q_{K + SL}) The straight line f_K(Q_K, Q_{K + S L})
(K = 1,2, ..., n-SL) is created (S2).

As a third step, the judgment means 13 determines whether or not there is a pixel of the image data of the work on the judgment line f _K (Q _K , Q _{K + SL} ) (k = 1, 2, ..., N-SL). Is determined (S
3).

Next, the effect of the device for inspecting the shape of the cut end surface of the work according to this embodiment will be described. Figure 4 is the work w
FIG. 6 is an explanatory diagram in the case where there is a convex protrusion at the tip of the. FIG. 5 is an explanatory diagram of the operation of FIG. 4 and 5 (1), (2),
As shown in (3), the judgment line f ₁ (Q ₁ , Q ₅ ) and the judgment line f ₂ (Q
₂ , Q ₆ ) and the judgment straight line f ₃ (Q ₃ , Q ₇ ) do not contact or intersect with the shadow of the work w. However, as shown in FIGS. 5 (4) and 5 (5), the judgment line f ₄ (Q ₄ , Q ₈ ) and the judgment line f ₅ (Q ₅ , Q ₉ ) are
It intersects with the shadow of the work w. Therefore, when there is a convex projection at the tip of the work w, at least one judgment line f _K (Q _K , Q _{K + SL} ) contacts or intersects with the shadow of the work w. Is correctly determined as a defective product.

FIG. 6 is an explanatory view when the tip of the work w is a gently curved surface. FIG. 7 is an explanatory view of the operation of FIG. As shown in FIGS. 6 and 7 (1), the decision line f ₁ (Q
₁ , Q _{S L + 1} ) does not contact or intersect with the shadow of the work w. However, as shown in FIG. 7 (2), (n-SL-1), (n-SL), the decision line f ₂ (Q ₂ , Q _{SL + 1} ), the decision line f
_n-SL-1 (Q _{n-SL- 1} , Q _n-1 ), judgment line f _n-SL (Q _n-SL , Q _n ).
Intersects the shadow of the work w. Therefore, when the tip of the work w is a gentle curve, at least one determination straight line f _K (Q _K , Q _{K + SL} ) contacts or intersects with the shadow of the work w, so that the determination means 13 causes the work w to work. Is correctly determined as a defective product.

FIG. 8 is an explanatory view when the tip of the work w has a recess such as a scratch. FIG. 9 is a diagram for explaining the operation of FIG.
As shown in FIGS. 8 and 9 (1) and (5), the judgment line f
_{The 1} (Q ₁ , Q ₅ ) and the judgment straight line f ₅ (Q ₅ , Q ₉ ) do not contact or intersect the shadow of the work w. However, FIG. 9 (2), (3),
As shown in (4), the decision line f ₂ (Q ₂ , Q ₆ ) and the decision line f ₃ (Q
₃ , Q ₇ ) and the judgment straight line f ₄ (Q ₄ , Q ₈ ) intersect with the shadow of the work w. Therefore, when the tip of the work w has a dent such as a scratch, at least one determination straight line f _K (Q _K , Q _{K + SL} ) contacts or intersects with the shadow of the work w. w is correctly determined as a defective product.

Although not shown, if the tip of the work w is smooth, the inclination of the judgment line f _K (Q _K , Q _{K + SL} ) is always constant, so not only on the horizontal plane but also on an inclined surface that is inclined. Even if there is, it can be judged as a good product.

As described above, as shown in FIG. 10, according to the inspection device for the shape of the tip cut surface of the work of this embodiment,
If the tip cut surface of the work w is smooth, it can be judged as a good product not only on a horizontal surface but also on an inclined surface inclined at an angle.
Even if the tip cutting surface of the work w is an inclined surface, defective parts such as protrusions and dents are formed, or a gently curved surface can be determined as a defective product.

[0029]

According to the first aspect of the present invention, if the cutting end surface of the work is smooth, it can be judged as a non-defective product even if it is an inclined surface inclined obliquely, and even if it is an inclined surface inclined obliquely. If there is a defective portion such as a protrusion or a dent, it can be determined as a defective product. According to the invention of claim 2, the presence or absence of a defective portion such as a protrusion or a dent can be detected even if the tip cutting surface of the workpiece is an inclined surface that is inclined. According to the invention of claim 3, even if the tip cutting surface of the work is smooth, it can be determined as a good product even if it is an inclined surface that is inclined obliquely. If there is a defective portion, it can be determined as a defective product.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an apparatus for inspecting the shape of a tip cut surface of a work according to the present embodiment, in which (A) is a plan view and (B) is a front view.

FIG. 2 is a system configuration diagram of a work shape determination system 10.

FIG. 3 is a flowchart of a determination process by the work shape determination system 10.

FIG. 4 is an explanatory diagram in the case where there is a convex protrusion at the tip of the work w.

FIG. 5 is an explanatory view of the operation of FIG.

FIG. 6 is an explanatory diagram when the tip of the work w is a gently curved surface.

FIG. 7 is an explanatory view of the operation of FIG.

FIG. 8 is an explanatory diagram when the tip of the work w has a recess such as a scratch.

FIG. 9 is an explanatory view of the operation of FIG.

FIG. 10 is a determination result table according to the inspection technique of the present invention.

11A and 11B are arrangement diagrams of a conventional inspection device for the tip cut surface shape of a work, where FIG. 11A is a plan view and FIG. 11B is a front view.

FIG. 12 is an inspection correlation diagram showing a relationship between the determination by the conventional inspection device for the shape of the tip cut surface of the work and the shape of the tip surface of the work w.

13A is a determination result table based on a conventional work shape inspection technique using a step, and FIG. 13B is an enlarged front view of a work w.

FIG. 14 is an explanatory diagram of a problem of a conventional work shape inspection technique using a step.

[Explanation of symbols]

1 Work rotation mechanism 2 lighting 3 CCD camera 4 Work shape determination device 10 Work shape determination system 11 Work edge position detection means 12 Judgment direct creation means 13 Judgment means n Total number of edge detection positions C Edge detection pitch Number of SL edges detected Sd judgment reference distance

Continued front page    F term (reference) 2F065 AA53 AA61 BB08 BB22 FF02                       FF04 GG02 GG03 GG07 JJ03                       JJ07 JJ26 MM04 MM13 MM23                       MM28 UU05 UU06                 2G051 AA90 AB07 CA03 CB02 CD06                       DA08 EA11 EA12 EB01

Claims (3)

[Claims] 1. An illumination for shining light toward a tip cut surface of a work to be inspected, and a shadow in which light is blocked by the tip cut surface of the work is scanned as an image and converted into image data. The work shape determination device includes a CCD camera and a work shape determination system that receives image data transmitted from the CCD camera and determines whether the work is nondefective or defective based on the image data. The judgment system stores a work reference position Sd and a work edge position detection means for detecting edge positions P ₁ (X ₁ , Y ₁ ) to P _n (X _n , Y _n ) at n points in the tip cross section of the work. Storage area for storing the number SL of detected edges in the detection section and the edge positions P ₁ (X ₁ , Y ₁ ) to P _n (X _n , Y _n ) in the X-axis direction. Position separated by the judgment reference distance Sd
Of the n points Q ₁ (X ₁ + Sd, Y ₁ ) to Q _n (X _n + Sd, Y _n ), two points (Q _K , Q _{K + SL} ) F judgment line f _K (Q _K , Q _{K + SL} )
(K = 1,2, ..., n-SL) on the decision line creating means and the decision line f _K (Q _K , Q _{K + SL} ) (k = 1,2, ..., n-SL) 6. A device for inspecting the shape of a tip cut surface of a work, comprising: a pass / fail determination unit that determines pass / fail of the work depending on whether or not there is a pixel of the image data of the work. 2. A work rotating mechanism for rotating the work around its axis is provided, and the illumination and CC are provided.
2. The inspection device for the shape of the tip cut surface of a work according to claim 1, wherein the D cameras are arranged at an angle of up and down with respect to the horizontal plane with the tip cut surface of the work as a center. 3. A first step of detecting edge positions P ₁ (X ₁ , Y ₁ ) to P _n (X _n , Y _n ) on both left and right sides in a tip cross section of a work, and the edge position P ₁ (X ₁ , Y ₁ ) -P _n (X _n , Y _n ), each position Q ₁ (X ₁ + Sd, Y) apart from the reference distance Sd in the X-axis direction.
₁ ) to Q _n (X _n + Sd, Y _n ), two points separated from each other by a distance corresponding to the number SL of detected edges in the detection section
_{(Q K, Q K + SL} ) signed a decision straight line _{f K (Q K, Q K} + SL) (k = 1,2, ..., n
-SL) and the decision line f _K (Q _K ,
Q _{K + SL} ) (k = 1, 2, ..., N-SL), which comprises a third step of determining whether or not there is a pixel of the image data of the work, and a method for inspecting a cut surface shape.