JP2000205839A - Measuring device for shape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measuring device for a shape that measures various kinds of parts on a measured object in a short time by a simple operation and man-hours for development are reduced. SOLUTION: A function from among detecting functions of a straight line edge, a circle edge, an arc edge, a center line edge, a center line between two straight lines, vertical line with a point passed to a straight line, a straight line connected between two points, an intersection point of two lines is chosen with command buttons 61-68. A dimension of a required part of a measured object is determined by combining the detecting functions. A confirming process of the setting of the detecting function is realized by storing the functions chosen as a hierarchical data structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a shape measuring instrument for measuring the shape of an object.

[0002]

2. Description of the Related Art Conventionally, a shape measuring instrument has been used to measure the length, angle, distance, shape, etc. of each part of an object. FIG. 20 is a block diagram showing a conventional shape measuring instrument using a personal computer.

[0003] The shape measuring instrument shown in FIG.
Camera 100 using CD (Charge Coupled Device), light source 11
0, a personal computer 120 and a CRT monitor 130. The camera 100 includes a lens 1
01 is attached. The camera 100 is fixed to a support (not shown).

A measuring object 300 is mounted on a stage (not shown) between the camera 100 and the light source 110.
Light from the light source 110 is applied to the measurement target 300, and a transmission image of the measurement target 300 is captured by the camera 100.

[0005] The image signal obtained by the camera 100 is
The data is transferred to the personal computer 120. An image capturing board 121 serving as an interface is mounted on the personal computer 120. The image capturing board 121 provides an image signal provided from the camera 100 to a signal processing unit 122 including a CPU (Central Processing Unit), a memory, an external storage device, and the like.

The signal processing unit 122 calculates dimensions such as the length, angle, and shape of each part of the measuring object 300 based on the image data, and displays an image of the measuring object 300 and the calculation result on the monitor 130.

FIG. 21 is a diagram showing an example of the light amount distribution of the measurement object imaged by the camera 100 of FIG. The horizontal axis in FIG. 21 is the pixel position of the CCD, and the vertical axis is the light amount.

As shown in FIG. 21, the light quantity is low in the area where the measuring object 300 is present, and is high in the area surrounding the measuring object 300. Edge e in light intensity distribution
Reference numerals 1 and e2 represent the ring intervals of the measurement object 300. Therefore, by calculating the distance between the edges e1 and e2 in the light quantity distribution, it is possible to measure the dimension of the measurement object 300.

[0009]

In the above-described conventional shape measuring instrument, when a plurality of edges of a measurement object displayed on the monitor 130 are designated, coordinates of the designated edge are detected, and the detected edge is detected. Is used to calculate the size of the desired portion of the measurement object. For example, a distance between two edges can be calculated by designating two edges of the image of the measurement object. In order to calculate the dimensions of a desired portion of the measurement target in this manner, the following various detection functions are prepared.

For example, in the detection function shown in FIG. 22A, a straight edge 600 is detected. In the detection function shown in FIG. 22B, a center line 603 between two straight edges 601 and 602 is detected. The detection function shown in FIG. 22C detects the circular edge 604 and its center point 604a.

Further, in the detection function shown in FIG.
An edge 607 passing through the center point 606 of the circular edge 605
Is detected. In the detection function shown in FIG. 23B, a straight line 613 connecting the center points 611 and 612 of the two circular edges 609 and 610 is detected. FIG.
In the detection function of (c), two straight edges 614 and 61
A straight line 618 passing through the intersection 616 of 5 and perpendicular to another straight edge 617 is detected.

In the detection function shown in FIG. 24A, a center line 621 between two straight edges 619 and 620 is used.
Is detected, and another two straight edges 622 and 623 are detected.
A center line 624 between them is detected.
A centerline 625 between 24 is detected.

In the detection function shown in FIG. 24B, a center line 6 between a straight line 631 connecting the center points 629 and 630 of two circular edges 627 and 628 and another straight edge 632 is detected.
33 are detected.

In the detection function shown in FIG.
34 and another two straight edges 6 passing through the center point 635
A straight line 639 perpendicular to the center line 638 between 36 and 637 is detected.

The dimensions of various parts of the object to be measured can be calculated using the coordinates of a straight line or a point detected by such various detection functions.

However, in the conventional shape measuring device, it is necessary to create algorithms for realizing the various detection functions described above for each content of the detection function. That is, it is necessary to create a new algorithm to realize a new detection function. As a result, the number of software development steps increases.

Further, when executing each of the detection functions, the user needs to accurately specify the edge of the image of the measurement object displayed on the screen of the monitor 130. Therefore, detailed work is required for the measurement, and the measurement time becomes longer.

Further, when a complicated detection function is used, it is difficult for the user to recognize on which straight line or point the detected straight line or point was detected.

An object of the present invention is to provide a shape measuring instrument which can measure various portions of an object to be measured in a short time by a simple operation and has reduced the number of development steps.

[0020]

Means for Solving the Problems and Effects of the Invention (1)
A first aspect of the present invention is a shape measuring instrument for measuring a shape of an object to be measured, and a light projecting unit that projects light onto the object to be measured, and a light projecting unit that projects light onto the light projecting unit. A light receiving unit that receives light transmitted through the object to be measured and outputs a signal corresponding to the amount of received light;
A conversion unit that converts an output signal from the light receiving unit from analog to digital to obtain digital image data, a display unit that displays an image of the measurement target based on the image data obtained by the conversion unit, and a display unit that displays the image. Edge specifying means for specifying an edge of the selected image; edge detecting means for detecting an edge specified by the edge specifying means based on the image data obtained by the converting means; and an edge detected by the edge detecting means or an edge detected by the edge detecting means. Auxiliary calculation means for calculating an auxiliary line or an auxiliary point based on the calculated auxiliary line or auxiliary point, and an edge detected by the edge detection means or an auxiliary line or an auxiliary point calculated by the auxiliary calculation means are designated as calculation targets. Calculating a physical quantity related to a plurality of calculation targets specified by the calculation target specifying unit It is obtained by a physical quantity calculation means.

In the shape measuring instrument according to the present invention, light is projected onto the object to be measured by the light projecting unit, light transmitted through the object to be measured is received by the light receiving unit, and a signal corresponding to the amount of received light is output. . The output signal of the light receiving section is converted from analog to digital by the conversion means, and digital image data is obtained. An image of the measurement object is displayed by the display means based on the image data.

When the edge of the image displayed by the display means is designated by the edge designation means, the designated edge is detected by the edge detection means based on the image data. Further, the auxiliary line or the auxiliary point is calculated by the auxiliary calculating means based on the detected edge or the already calculated auxiliary line or the auxiliary point.

When the edge and the auxiliary line or the auxiliary point are specified as calculation targets by the calculation target specifying means, physical quantities relating to a plurality of calculation targets are calculated by the physical quantity calculating means.

As described above, since the auxiliary line or the auxiliary point is calculated based on the detected edge or the already calculated auxiliary line or auxiliary point, by specifying the edge, the auxiliary line or the auxiliary point as a calculation target. In addition, it is possible to calculate the physical quantities related to various portions of the measurement object without creating many dedicated algorithms.

Therefore, the number of software development steps can be reduced, and various portions of the object to be measured can be measured with a simple operation, and the measurement time can be shortened.

(2) Second invention In the configuration of the shape measuring instrument according to the first invention, the edge detecting means is provided with a plurality of points of the image displayed by the display means. Image position specifying means for specifying, and edge detection area setting means for setting an edge detection area based on a plurality of points specified by the image position specification means, wherein the edge detection means is set by the edge detection area setting means The edge is detected based on the image data in the detected edge detection area.

In this case, an edge detection area is set based on a plurality of points, and an edge is detected based on image data in the edge detection area. Therefore, by specifying a plurality of points near the edge of the image, the edge is detected. It can be easily detected. Therefore, there is no need to perform an operation to accurately specify the edge of the image.

(3) Third invention The shape measuring instrument according to the third invention is the configuration of the shape measuring instrument according to the second invention, wherein the edge designating means uses the edge detected by the edge detecting means. And an edge detection area resetting means for resetting the edge detection area to a predetermined position. The display means displays the edge detection area reset by the edge detection area resetting means.

In this case, the edge detection area detected by the edge detection means is reset to a predetermined position by the edge detection area resetting means, and the reset edge detection area is displayed by the display means. Therefore, the user can easily recognize the detected edge.

(4) Fourth invention The shape measuring instrument according to the fourth invention is characterized in that the shape measuring instrument is a
In the configuration of the shape measuring instrument according to the invention, the edge detecting means has a function of detecting a straight edge or a function of detecting a circular edge.

In this case, a straight edge is detected by the straight edge detecting function of the edge detecting means, and a circular edge or an arc edge is detected by the circular edge detecting function.

(5) Fifth invention The shape measuring instrument according to the fifth invention is the configuration of the shape measuring instrument according to any one of the first to fourth inventions, wherein the auxiliary calculation means is a center line of two straight lines. Has the function of detecting a straight line passing through one point and perpendicular to one straight line, the function of detecting a straight line connecting two points, or the function of detecting the intersection of two straight lines.

In this case, the center line of the two straight lines is detected by the function of detecting the center line of the two straight lines, and the center line of the two straight lines is detected by the function of detecting a straight line passing through one point and perpendicular to the one straight line. A straight line perpendicular to one straight line is detected. Further, a straight line connecting two points is detected as an auxiliary line by a function of detecting a straight line connecting two points, and an intersection of two straight lines is detected as an auxiliary point by a function of detecting an intersection of two straight lines.

(6) Sixth Invention The shape measuring instrument according to the sixth invention is the configuration of the shape measuring instrument according to any one of the first to fifth inventions, wherein the auxiliary line or the auxiliary line calculated by the auxiliary calculating means is provided. Storage means for storing the relationship between an auxiliary point and an edge, an auxiliary line or an auxiliary point serving as a basis for calculating the auxiliary line or the auxiliary point, and an auxiliary for designating the auxiliary line or the auxiliary point calculated by the auxiliary calculation means And a display unit for displaying an edge, an auxiliary line, or an auxiliary point, which is a basis for calculating the auxiliary line or the auxiliary point specified by the specifying unit based on the relationship stored in the storage unit. is there.

In this case, when any of the displayed auxiliary line or auxiliary point is designated, an edge, an auxiliary line or an auxiliary point which is a basis for calculating the specified auxiliary line or auxiliary point is displayed. Therefore, the user can easily recognize the contents of the detection processing.

[0036]

FIG. 1 is a schematic diagram showing the configuration of a shape measuring instrument according to an embodiment of the present invention. In the following description, a unit smaller than a unit of a pixel of the CCD is referred to as a sub-pixel.

In FIG. 1, a shape measuring instrument 1 includes a housing 10
A light emitting unit 20 and a light receiving unit 30 are provided therein. Floodlight unit 20
A stage 40 on which an object to be measured is placed is provided between the light receiving section 30 and the light receiving section 30.

The shape measuring instrument 1 is provided with an input / output terminal 13 for inputting and outputting various signals and various data. A personal computer 70 is connected to the input / output terminal 13 via a cable 14.

The personal computer 70 includes a keyboard 71, a pointing device 72 such as a mouse, and a display 73. On the screen of the display 73, an image display section 74 for displaying an image of the measurement target, a measurement result display section 75 for displaying measurement data, and an operation section 76
Is formed.

FIG. 2 is a schematic sectional view showing the structure of the shape measuring instrument 1 of FIG. In FIG. 2, a light projecting unit 20 and a light receiving unit 30 are provided in a housing 10. Floodlight unit 20
Includes a light emitting diode 21, a diffusion plate 22 made of frosted glass or the like, a stop 23, a light projecting lens 24, a light projecting mirror 25, and a dustproof filter 26. The diaphragm 23 is formed of a thin plate member having a circular opening, and the diaphragm diameter is fixed. The light receiving unit 30 includes a dustproof filter 31, a first lens 32, a light receiving mirror 33, a band pass filter 35, an aperture 36, a second lens 37, and a CCD (charge coupled device).
38. The diaphragm 36 is formed of a thin plate member having a circular opening. The band pass filter 35, the aperture 36 and the second lens 37 are integrally accommodated in the lens barrel 34. Further, the lens barrel 34 and the CCD 38 are housed integrally in a case 39.

A measuring table 41 made of transparent glass is arranged by a stage 40 between the dustproof filter 26 of the light projecting section 20 and the dustproof filter 31 of the light receiving section 30.
An object to be measured is supported on a support surface 42 of the measuring table 41.
The support surface 42 of the measuring table 41 is the first lens 3 of the light receiving unit 30.
2 is set perpendicular to the optical axis.

The light emitted from the light emitting diode 21 is
The light diffused by the diffusion plate 22 and diffused by the diffusion plate 22 is shaped into a circle by passing through a circular opening of the diaphragm 23. The light that has passed through the circular opening of the stop 23 is converted by the light projecting lens 24 into parallel light that travels in the horizontal direction. The parallel light is reflected upward by the light projecting mirror 25, passes through the dustproof filter 26, and
The object to be measured is irradiated.

The light transmitted through the object to be measured passes through the dustproof filter 31, is condensed by the first lens 32, and is reflected by the light receiving mirror 33 in the horizontal direction. The light reflected by the light receiving mirror 33 passes through the band-pass filter 35, passes through the circular opening of the stop 36, and is imaged on the light receiving area of the CCD 38 by the second lens 37.

FIG. 3 is a block diagram of the shape measuring instrument of FIG. In FIG. 3, a timing generation circuit 51 generates a vertical synchronizing pulse V, a horizontal synchronizing pulse H, a CCD shutter pulse SH, and an LED (light emitting diode) lighting pulse LD. The LED (light emitting diode) lighting circuit 52 turns on the light emitting diode 21 in response to the LED lighting pulse LD generated by the timing generating circuit 51.

The light emitted from the light emitting diode 21 is
The light passes through the circular opening of the stop 23, is converted into parallel light by the light projecting lens 24, and is irradiated on the object to be measured. The transmitted light from the measurement object is condensed by the first lens 32, passes through the circular opening of the diaphragm 36, and forms an image on the light receiving area of the CCD 38 by the second lens 37. The CCD 38 is
An analog output signal corresponding to the amount of received light is derived.

An A / D converter (analog-digital converter) 53 converts the output signal of the CCD 38 into a digital signal, writes the digital signal into the image memory 54 as image data, and supplies the digital signal to the moving image processing circuit 57.

The edge detection processing section 55 includes a differentiator,
By differentiating the image data read from the image memory 54, the position of the edge of the image is detected by a method described later, and is written to the edge memory 56 as edge data.
The moving image processing circuit 57 outputs moving image data indicating an image of the measurement target based on the image data provided from the A / D converter 53.

The microcomputer 58 includes the edge data stored in the edge memory 56 and the moving image processing circuit 5.
7 is selectively transmitted to the personal computer 70 via the communication interface circuit 59. Further, the microcomputer 58 supplies a processing start trigger signal TR and an edge detection window designation signal ED to the edge detection processing unit 55 based on a command signal given from the personal computer 70 via the communication interface circuit 59.

The personal computer 70 displays an image of the object to be measured on the image display section 74 on the screen of the display 73 in FIG. 1 based on the moving image data transmitted from the microcomputer 58 via the communication interface circuit 59. Further, the personal computer 70 is provided with a communication interface circuit 59 from the microcomputer 58.
The dimensions such as the length, angle, and distance of each part of the object to be measured are calculated based on the edge data transmitted through the interface, and the calculation result is used as measurement data to display a measurement result display section 75 on the screen of the display 73 in FIG. To be displayed.

FIG. 4 is a diagram showing an example of the output value of the A / D converter 53 of FIG. In FIG. 4, the horizontal axis is the CCD 38.
The vertical axis indicates the output value of the A / D converter 53. As shown in FIG. 4, the output value of the A / D converter 53 rises from the pixel position “−3” of the CCD 38 to “2”.

FIG. 5 is a diagram showing an example of the output value of the differentiator of the edge detection processing section 55 of FIG. In FIG. 5, the horizontal axis is the pixel position of the CCD 38, and the vertical axis is the output value of the differentiator. As shown in FIG. 5, the peak position PK0 of the output value of the differentiator is the pixel position “0” of the CCD 38.
The peak position PK0 of the output value of the differentiator is the edge position of the CCD 38 at the pixel level.

Therefore, the edge detection processing section 55 stores the peak position PK0 at the pixel level as the edge position at the pixel level in the edge memory 56.

The edge detection processing section 55 calculates the peak position PK1 at the sub-pixel level based on the output value of the differentiator at the peak position PK0 at the pixel level and the output values of the differentiators at the preceding and succeeding pixel positions. . In this case, the edge detection processing unit 55 performs waveform approximation on the output value of the differentiator at the peak position PK0 at the pixel level and the output values of the differentiators at the preceding and succeeding pixel positions using a predetermined sub-pixel table. To calculate the peak position PK1 at the sub-pixel level.

The difference value ΔPK between the peak position PK0 at the pixel level and the peak position PK1 at the subpixel level is stored in the sub-pixel table as a look-up table. Therefore, when the output value of the differentiator at the peak position PK0 at the pixel level and the output values of the differentiators at the preceding and succeeding pixel positions are given to the sub-pixel table, the difference value ΔPK is output. The edge detection processing unit 55 calculates the peak position PK1 at the sub-pixel level using the peak position PK0 at the pixel level and the difference value ΔPK output from the sub-pixel table.

FIG. 6 shows the personal computer 70 of FIG.
5 is a diagram showing a first screen of a display 73 of FIG.

As shown in FIG. 6, an image of the measurement object is displayed on an image display section 74 on the screen of the display 73. The measurement result display unit 75 includes a plurality of frames for displaying measurement data. Further, the operation unit 76 includes an edge / auxiliary button 81, a measurement designation button 8
2 and a measurement execution button 83 are formed. When the edge / auxiliary button 81 is designated, eight command buttons 61 to 68 are displayed.

FIG. 7 is a diagram showing an edge detecting function and an auxiliary line / auxiliary point detecting function corresponding to the command buttons 61 to 68 of FIG. FIG.
The detection functions (a) to (h) are respectively selected.

These detection functions are performed by a CPU (central processing unit) according to a detection processing program stored in a recording medium such as a hard disk of the personal computer 70.
And the edge detection processing unit 55 of FIG.

The auxiliary line is a line detected by the auxiliary line / auxiliary point detecting function, and the auxiliary point is a point detected by the auxiliary line / auxiliary point detecting function.

When the command button 61 is designated by the pointing device 72, the straight edge detection function shown in FIG. 7A is selected. In this case, the straight edge 150 specified by the pointing device 72 is detected. When the command button 62 is designated, FIG.
Is selected. In this case, the designated circular edge 151 and its center point are detected.

When the command button 63 is designated, FIG.
The arc edge detection function shown in (c) is selected. In this case, the designated arc edge 153 is detected. This arc edge detection function is a part of the circular edge detection function.

When the command button 64 is designated, FIG.
The center line edge detection function shown in (d) is selected. In this case, two edges 153 and 15 within the designated range
A center line 155 connecting the center points between the four is detected.

When the command button 65 is designated, FIG.
The detection function of the center line between the two straight lines shown in (e) is selected. An edge or an auxiliary line can be designated as the two straight lines. In this case, the two specified straight lines 156, 1
A centerline 158 between 57 is detected.

When the command button 66 is designated, FIG.
The function of detecting a straight line passing through one point and perpendicular to one straight line shown in FIG. As one point, a center point or an auxiliary point of a circular edge can be designated. A straight edge or an auxiliary line can be designated as one straight line. In this case, the specified straight line 16 passing through the specified point 159
A straight line 161 perpendicular to 0 is detected.

When the command button 67 is designated, FIG.
The detection function of the straight line connecting the two points shown in (g) is selected.
As the two points, the center point or the auxiliary point of the circular edge can be designated. In this case, a straight line 164 connecting the designated point 162 and the designated point 163 is detected.

When the command button 68 is designated, FIG.
(H) The function of detecting the intersection of two straight lines is selected. A straight edge or an auxiliary line can be designated as the two straight lines. In this case, an intersection 167 between the specified straight line 165 and the specified straight line 166 is detected.

FIG. 8 shows the personal computer 70 of FIG.
7 is a diagram showing a second screen of the display 73 of FIG.

When the measurement designation button 82 of the operation unit 76 is designated, calculation designation buttons 91 to 98 for designating the type of measurement
And a save button 99 are displayed.

When the calculation designation button 91 is designated, a process for calculating the distance between two straight lines is selected. Calculation designation button 92
Is selected, the process of calculating the angle between the two straight lines is selected. When the calculation designation button 93 is designated, the calculation processing of the radius of the circle is selected. When the calculation designation button 94 is designated,
The calculation processing of the diameter of the circle is selected.

When the calculation designation button 95 is designated, the processing for calculating the distance between the straight line and the center of the point or the circle is selected.
When the calculation designation button 96 is designated, a process for calculating the distance between the straight line and the tangent to the circle is selected. When the calculation designation button 97 is designated, a process of calculating the distance between two points or the center point of a circle is selected. When the calculation designation button 98 is designated, 2
The process of calculating the distance between the tangents of two circles is selected.

In this case, by designating any one of the calculation designation buttons 91 to 98 after designating the frame of the measurement result display section 75, the type of measurement can be associated with the designated frame. When the save button 99 is designated, the correspondence between the designated frame and the designated measurement type is saved in a recording medium such as a memory or a hard disk of the personal computer 70.

FIG. 9 shows the personal computer 70 of FIG.
13 is a diagram showing a third screen of the display 73 of FIG.

When the measurement execution button 83 of the operation section 76 is designated, a data measurement button 84 is displayed. When the frame of the measurement result display section 75 is specified and the data measurement button 84 is specified, the type of measurement specified on the screen of FIG. 8 is executed, and the calculation result is used as the measurement data as the measurement result display section 75.
Will be displayed in the corresponding frame.

Next, an example of the measurement of the measuring object shown in FIG. 10 will be described with reference to FIGS.

Here, in the measuring object of FIG.
A center line 203 between the edges 201 and 202 is detected, a center line 206 between the edges 204 and 205 is detected, and a center line 207 between the center lines 203 and 206 is detected. The case of calculating the distance L1 between them will be described.

First, the user designates the edge / auxiliary button 81 and the command button 61 in FIG.
As shown in FIG. 2, two points 2 on or near the line of the edge 201
11 and 212 are designated. As a result, as shown in FIG.
01 is displayed, and the edge 2 is detected by the straight edge detection function.
01 coordinates are detected.

Similarly, as shown in FIG.
When edges 202, 204, 205, and 208 are specified,
Edge detection windows 302, 304, 305, 308
Are displayed, and edges 202, 204, 205,
208 are detected.

Next, as shown in FIG. 12D, the command button 65 of FIG.
Edges 201 and 202 are selected by designating one point 213 on or near the line of, and designating one point 214 near the detected edge 202.

As a result, as shown in FIG.
Edges 201 and 20 are detected by the function of detecting the center line between two straight lines.
The center line 203 between the two is detected and displayed on the screen.

Similarly, as shown in FIG.
The command button 65 in FIG.
Select 05. Thereby, the selected edge 20
The center line 206 between the positions 4, 205 is detected and displayed on the screen.

Next, as shown in FIG. 13 (g), the command button 65 of FIG.
The center lines 203 and 206 are selected by designating a point 215 on or near the line of, and specifying a point 216 on or near the detected center line 206.

As a result, as shown in FIG.
Center line 2 selected by the center line detection function between two straight lines
The center line 207 between 03 and 206 is detected and displayed on the screen.

Thereafter, the screen of FIG. 8 is displayed by designating the measurement designation button 82, and the frame of the measurement result display section 75 is designated. Further, a calculation designation button 91 is designated, and as shown in FIG.
The center line 207 and the edge 208 are selected by specifying a point 217 on or near the line 07 and specifying a point 218 on or near the detected edge 208. To save the above settings as a file on a hard disk or the like, the save button 99 in FIG. 8 is designated. As a result, the settings described above are saved as a file.

Next, the screen shown in FIG. 9 is displayed by designating the measurement execution button 83. Further, when the data measurement button 84 is designated, measurement is performed for all frames. In this case, the center line 207 and the edge 20
8 is calculated, and the calculated distance is displayed in the corresponding frame.

FIG. 14 is a flowchart showing the edge detection processing. FIG. 15 is a diagram showing an operation of resetting the edge detection window to an accurate position in the edge detection processing.

Here, a case where the edge 500 shown in FIG. 15 is detected will be described. Hereinafter, the edge detection processing will be described with reference to FIGS.

First, as shown in FIG. 15A, when two points p1 and p2 near the edge 500 are designated by the user using the pointing device 72 of FIG. 1 (step S1), the personal computer 70 The edge detection processing program sets an edge detection window EW based on the designated two points p1 and p2 (Step S)
2). In this case, the edge detection window EW is set to an area having a predetermined width on both sides around a straight line connecting the designated two points p1 and p2.

Next, the personal computer 70 transmits the processing start trigger signal TR and the edge detection window designation signal ED to the edge detection processing section 55 via the communication interface circuit 59 and the microcomputer 58. Here, the edge detection window designation signal ED is
It is coordinate data indicating the position of the edge detection window EW.

Thus, the edge detection processing unit 55 shown in FIG.
Detects the coordinates of the edge 500 based on the image data in the edge detection window EW (step S3). The detected coordinates of the edge 500 are stored in the edge memory 56 as edge data and transmitted to the personal computer 70 via the microcomputer 58 and the communication interface circuit 59.

Next, the edge detection processing program of the personal computer 70 calculates intersections 501 and 502 between the two short sides EA and EB of the edge detection window EW and the edge 500 based on the edge data (step S).
4).

Further, as shown in FIG. 15B, the edge detection window EW is reset based on the calculated intersections 501 and 502 (step S5). In this case, the edge detection window EW is reset to a region of a predetermined width on both sides around the straight line connecting the intersections 501 and 502.

As described above, when the user specifies two points near the edge of the image of the measurement object on the screen of the image display unit 74, the edge is detected and the edge detection window EW is displayed. Reset along the edges. Therefore, the user does not need to perform a detailed operation for specifying the exact position of the edge on the screen. As a result, the measurement time is reduced.

As described above, according to the shape measuring instrument of the present embodiment, various measurement contents can be realized by combining a small number of edge detecting functions and auxiliary line / auxiliary point detecting functions. Therefore, various measurements can be performed without creating an algorithm for each measurement content. As a result, software development man-hours are reduced.

Next, with reference to FIGS. 16 and 17, an example of the confirmation processing of the setting contents of the detection processing in the shape measuring instrument of this embodiment will be described.

Here, as shown in FIG.
A center line m5 between the first and the second m2 and edges m3 and m
The center line m6 between the four center lines m4 and m4 is detected, and the center line m7 between the center lines m5 and m6 is detected. The setting content of this detection processing is stored in the memory of the personal computer 70 as a hierarchical data structure.

In addition to the center line, there are various types of auxiliary lines such as a vertical line and a straight line between two points.
It can be easily understood that the center line is easily seen by viewing the arrangement of 5, m6 on the screen.

FIG. 17 is a diagram showing data stored in the memory by the detection processing of FIG. As shown in FIG. 17, when the detection processing of the edge m1 is performed, data M1 is stored in the memory as a processing number, and data indicating the processing of detecting a straight edge is stored as a processing type. When the edge m2 is detected, data M2 is stored as a process number in the memory, and data indicating a straight edge detection process is stored as a process type.

When edge m3 is detected, data M3 is stored in the memory as a process number, and data indicating a straight edge detection process is stored as a process type. When the edge m4 is detected, data M4 is stored in the memory as a process number, and data indicating a straight edge detection process is stored as a process type.

Next, when the detection processing of the center line m5 between the edges m1 and m2 is performed, the data M5 is stored in the memory as the processing number.
Is stored, data indicating a process of detecting a center line between two straight lines is stored as a process type, and data M is used as a reference number.
1, M2 are stored.

Similarly, the center line m6 between the edges m3 and m4
Is detected, data M is stored in the memory as a processing number.
6 is stored, data indicating a process of detecting a center line between two straight lines is stored as a process type, and data M3 and M4 are stored as reference numbers.

Further, the center line m7 between the center lines m5 and m6
Is detected, data M is stored in the memory as a processing number.
7 is stored, data indicating a process of detecting a center line between two straight lines is stored as a process type, and data M5 and M6 are stored as reference numbers.

FIG. 18 is a diagram showing a hierarchical data structure stored in the memory of FIG. As shown in FIG. 18, the data stored in the memory of FIG. 17 has a hierarchical structure according to the processing number and the reference number. Thereby,
The user can easily confirm the setting contents of the detection processing.

First, when the center line m7 in FIG. 16 is designated by the pointing device 72, the reference number data M5, M5 corresponding to the processing number data M7 stored in the memory.
6, the center lines m5 and m6 are highlighted together with the center line m7 on the screen. Thus, the user can confirm that the center line m7 is formed based on the center lines m5 and m6.

Similarly, when the center line m5 is designated by the pointing device 72, the edges m1 and m2 are displayed together with the center line m5 on the screen based on the reference number data M1 and M2 corresponding to the processing number data M5 stored in the memory. Highlighted above. Thereby, the user can confirm that the center line m5 is formed based on the center lines m1 and m2.

When the center line m6 is designated by the pointing device 72, the edges m3 and m4 are displayed together with the center line m6 on the screen based on the reference number data M3 and M4 corresponding to the processing number data M6 stored in the memory. Is highlighted. Thereby, the user can confirm that the center line m6 is formed based on the edges m3 and m4.

As described above, since the processing number, the processing type, and the reference number are stored in the memory as a hierarchical data structure, it is easy to confirm the setting contents of various detection processings by using one kind of algorithm. be able to.

It is also possible to realize the confirmation processing of the setting contents of the detection processing without using a hierarchical data structure.

For example, as shown in FIG.
The reference numbers and modes are stored in the areas A to N of the memory in a one-dimensional data structure, the area A is associated with the areas C and I, the area C is associated with the areas E and G, the area I is the areas K and
A dedicated algorithm corresponding to M is prepared. Thereby, the setting contents of the detection processing can be confirmed.

However, in this case, it is necessary to create a dedicated association algorithm for each content of the detection processing, and a large number of algorithms are required.

On the other hand, if the hierarchical data structure shown in FIG. 17 is used, it is possible to confirm the setting contents of the detection processing by the same algorithm regardless of the contents of the detection processing.

In this embodiment, the A / D converter 53 corresponds to the conversion means, the display 73 corresponds to the display means, and the pointing device 72 and the display 73 correspond to the edge designation means, the image position designation means, the calculation target designation means. And an auxiliary designation means. Further, the personal computer 70 and the edge detection processing unit 55 correspond to an edge detection unit, and the personal computer 70 corresponds to an auxiliary calculation unit, a physical quantity calculation unit, an edge detection area setting unit, and an edge detection area resetting unit.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a configuration of a shape measuring instrument according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view showing the structure of the shape measuring instrument of FIG.

FIG. 3 is a block diagram of the shape measuring instrument of FIG. 1;

FIG. 4 is a diagram illustrating an example of an output value of an A / D converter in the shape measuring instrument of FIG. 1;

FIG. 5 is a diagram illustrating an example of an output value of a differentiator of an edge detection processing unit in the shape measuring device of FIG. 1;

FIG. 6 is a diagram showing a first screen displayed on a display of the personal computer in FIG. 1;

FIG. 7 is a diagram showing various detection functions in the shape measuring instrument of FIG. 1;

8 is a diagram showing a second screen displayed on the display of the personal computer in FIG. 1.

FIG. 9 is a diagram showing a third screen displayed on the display of the personal computer in FIG. 1;

FIG. 10 is a diagram illustrating an example of an object to be measured.

11 is a diagram for explaining an example of measurement of the measurement target in FIG.

12 is a diagram for explaining an example of measurement of the measurement object in FIG.

FIG. 13 is a diagram for explaining an example of measurement of the measurement object in FIG. 10;

FIG. 14 is a flowchart illustrating edge detection processing.

FIG. 15 is a diagram illustrating resetting of an edge detection window in edge detection processing.

FIG. 16 is a diagram for explaining a process of confirming the setting content of the detection unit.

FIG. 17 is a diagram showing data stored in a memory by the detection means of FIG. 16;

18 is a diagram showing a hierarchical data structure stored in the memory of FIG.

FIG. 19 is a diagram showing a one-dimensional data structure stored in a memory by a detection process and an association of each area.

FIG. 20 is a block diagram showing a conventional shape measuring instrument.

21 is a diagram illustrating an example of a light amount distribution of a measurement target imaged by a camera in the shape measuring instrument in FIG. 20.

FIG. 22 is a diagram showing a detection function in a conventional shape measuring instrument.

FIG. 23 is a diagram showing a detection function in a conventional shape measuring instrument.

FIG. 24 is a diagram showing a detection function in a conventional shape measuring instrument.

[Explanation of symbols]

 Reference Signs List 1 shape measuring device 20 light emitting unit 30 light receiving unit 53 A / D converter 54 image memory 55 edge detection processing unit 56 edge memory 61 to 68 command button 70 personal computer 72 pointing device 73 display 74 image display unit 75 measurement result display unit 76 Operation unit 81 Edge / auxiliary button 82 Measurement designation button 83 Measurement execution button 91-98 Calculation designation button

Continuation of the front page (72) Inventor Masao Sugimori 1-3-14 Higashinakajima, Higashiyodogawa-ku, Osaka City, Osaka F-term in Keyence Corporation (reference) 2F065 AA04 AA12 AA31 BB05 DD06 FF01 FF04 GG07 HH02 JJ03 JJ26 LL00 LL04 LL12 LL12 LL21 LL21 LL21 LL30 NN03 QQ03 QQ21 QQ24 QQ32 QQ35 QQ36 SS13 UU05

Claims (6)

[Claims] 1. A shape measuring device for measuring a shape of an object to be measured, comprising: a light projecting unit for projecting light onto the object to be measured; A light-receiving unit that outputs a signal corresponding to the amount of received light; a conversion unit that converts an output signal from the light-receiving unit from analog to digital to obtain digital image data; based on the image data obtained by the conversion unit. Display means for displaying an image of the object to be measured by the display means; edge designation means for designating an edge of the image displayed by the display means; and the edge designation means based on the image data obtained by the conversion means. Edge detecting means for detecting a designated edge; and an auxiliary line or an auxiliary point based on the edge detected by the edge detecting means or an already calculated auxiliary line or auxiliary point. Auxiliary calculation means to be output, a calculation target specifying means for specifying an edge detected by the edge detection means or an auxiliary line or an auxiliary point calculated by the auxiliary calculation means as a calculation target, and A shape measuring device comprising: physical quantity calculating means for calculating physical quantities related to a plurality of designated calculation targets. 2. The image processing apparatus according to claim 1, wherein the edge designating means designates a plurality of points of the image displayed by the display means, and an edge detection area based on the plurality of points designated by the image position designating means. 2. An edge detection area setting means for setting an edge detection area, wherein the edge detection means detects an edge based on image data in the edge detection area set by the edge detection area setting means. The shape measuring instrument as described. 3. The edge specifying means further includes an edge detection area resetting means for resetting an edge detection area to a predetermined position by using an edge detected by the edge detecting means. The shape measuring instrument according to claim 2, wherein the edge detection area reset by the edge detection area resetting means is displayed. 4. The shape measuring instrument according to claim 1, wherein said edge detecting means has a function of detecting a straight edge or a function of detecting a circular edge. 5. The auxiliary calculating means detects a center line of two straight lines, detects a straight line passing through one point and is perpendicular to one straight line, detects a straight line connecting two points, or detects an intersection of two straight lines. The shape measuring instrument according to any one of claims 1 to 4, having a function. 6. A storage unit for storing a relationship between an auxiliary line or an auxiliary point calculated by the auxiliary calculation unit and an edge, an auxiliary line, or an auxiliary point serving as a basis for calculating the auxiliary line or the auxiliary point; And an auxiliary designation unit for designating an auxiliary line or an auxiliary point calculated by the calculation unit, wherein the display unit is configured to specify the auxiliary line or the auxiliary line specified by the designation unit based on the relationship stored in the storage unit. The shape measuring instrument according to claim 1, wherein an edge, an auxiliary line, or an auxiliary point serving as a basis for calculating the auxiliary point is displayed.