JP3132315U - Image measuring device - Google Patents

Abstract

An image measuring apparatus that suppresses deterioration of operability due to enlargement / reduction display of an image is provided.
An image measuring apparatus displays a workpiece image captured by an imaging unit and an edge detection tool image for performing edge detection of a predetermined region of the workpiece based on the workpiece image in a display control unit. The image measuring apparatus enlarges and reduces the edge detection tool image in the first enlargement / reduction unit so that the line width of the edge detection tool image is maintained at a predetermined predetermined width, and is adjusted to a predetermined display area (step S103, S104). On the other hand, the image measuring apparatus enlarges or reduces the work image so as to fit a predetermined display area in the second enlargement / reduction unit (step S105). Then, the image measuring device combines the edge detection tool image enlarged or reduced by the first enlargement / reduction unit and the work image enlarged or reduced by the second enlargement / reduction unit by the synthesis unit (step S106). ).
[Selection] Figure 5

Description

  The present invention relates to an image measuring apparatus such as a non-contact three-dimensional measuring machine.

  The image measuring apparatus usually has a video window for displaying a work image captured by a camera. Then, various edge detection tool images for performing edge detection on the image are drawn in the window, and image measurement is generally performed (see, for example, Patent Documents 1 and 2).

  Conventionally, the memory sizes of the “work image” and the “edge detection tool image” displayed in the video window are handled as data having the same image size. When displaying the “work image” and the “edge detection tool image” on the video window, the “work image” and the “edge detection tool image” having the same image size are combined and displayed. Such a display format is common.

  In recent years, the image data size of the “work image” is also increasing with the increase in the number of pixels of the imaging device. For example, the imaging device is a megapixel, and the data size is Quad-VGA size (1280 × 960) or larger.

When using an imaging device with such a high pixel count, the “edge detection tool image” is enlarged to the size of the “work image”, and the enlarged “edge detection tool image” and “work image” are combined. Thereafter, a process for displaying on the video window is performed. When digital zoom processing is performed on the video window, enlargement / reduction processing of the combined image is performed, and processing for displaying the entire image or displaying only the image of the measurement target portion is performed.
JP-A-11-201738 JP 2001-319219 A

  However, when performing digital zoom on the image displayed in the video window, because the enlargement / reduction processing is performed on the image data after combining the “edge detection tool image” and the “work image”, The drawing line width of the measurement tool displayed in the video window is changed depending on the zoom magnification.

  In other words, when the user performs measurement, when the edge detection tool is displayed by enlarging the measurement target portion of the workpiece imaging screen displayed in the video window with the digital zoom, The line width of the detection tool image becomes thick.

  In this case, there is a problem that not only the appearance is bad, but also the operation of arranging the edge detection tool image on the edge portion of the work becomes difficult.

  The present invention has been made in view of such problems, and an object of the present invention is to provide an image measurement apparatus that suppresses deterioration of operability due to enlargement / reduction display of an image.

  To achieve the above object, an image measuring apparatus according to the present invention includes an imaging unit that images a workpiece, the workpiece image captured by the imaging unit, and an edge of a predetermined region of the workpiece based on the workpiece image A display control unit for displaying an edge detection tool image for detection on a display unit; and the edge detection tool image is enlarged and enlarged at a predetermined magnification while maintaining a line width of the edge detection tool image at a predetermined predetermined width. A first enlargement / reduction unit to reduce, a second enlargement / reduction unit to enlarge or reduce the work image at the predetermined magnification, an edge detection tool image enlarged or reduced by the first enlargement / reduction unit, and And a synthesis unit that synthesizes the work image enlarged or reduced by the second enlargement / reduction unit, and the display control unit displays the image synthesized by the synthesis unit on the display unit. .

  With the above configuration, the image measuring apparatus according to the present invention enlarges or reduces the edge detection tool image at a predetermined magnification while maintaining the line width at a predetermined predetermined width in the first enlargement / reduction unit, and the second enlargement / reduction unit The work image is enlarged or reduced to a predetermined magnification at, and the edge detection tool image and the work image which are respectively enlarged or reduced by the synthesis unit are synthesized. That is, even when the edge detection tool image is enlarged or reduced, the line width is always kept constant. Therefore, the user can easily perform an operation of arranging the edge detection tool image on the work edge portion.

  In addition, the work image displayed on the display unit and a specific region receiving unit that receives specification of a specific region of the edge detection tool image, the first enlargement / reduction unit includes the edge detection tool image in the specific region The second enlargement / reduction unit may enlarge or reduce the work image in the specific area.

  In addition, the first enlargement / reduction unit includes a coordinate conversion unit that converts the drawing data of the edge detection tool image, and a line width based on the drawing data coordinate-converted by the coordinate conversion unit. It is good also as a structure provided with the edge detection tool image generation part which produces | generates the edge detection tool image hold | maintained at the width | variety.

  According to the present invention, it is possible to provide an image measurement device that suppresses deterioration of operability due to enlargement / reduction display of an image.

  Hereinafter, a preferred embodiment of an image measuring apparatus according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view showing an overall configuration of the image measuring apparatus according to the present embodiment. This image measuring apparatus includes a non-contact type measuring machine main body 1, a computer system 2 that drives and controls the measuring machine main body 1 and executes necessary data processing, and a printer 3 that prints out measurement results. Has been.

  The measuring machine main body 1 is configured as follows. That is, a measurement table 13 on which the workpiece 12 is placed is mounted on the gantry 11, and this measurement table 13 is driven in the Y-axis direction by a Y-axis drive mechanism (not shown). Support arms 14 and 15 extending upward are fixed to the center of both side edges of the gantry 11, and an X-axis guide 16 is fixed so as to connect both upper ends of the support arms 14 and 15. An imaging unit 17 is supported on the X-axis guide 16. The imaging unit 17 is driven along the X-axis guide 16 by an X-axis drive mechanism (not shown). A CCD camera 18 is mounted on the lower end of the imaging unit 17 so as to face the measurement table 13. Further, in the imaging unit 17, in addition to a lighting device and a focusing mechanism (not shown), a Z-axis drive mechanism that moves the position of the CCD camera 18 in the Z-axis direction, and a position of the CCD camera 18 in the Z-direction at the shooting position A position sensor 19 for detecting is incorporated.

  The computer system 2 includes a computer main body 21, a keyboard 22, a joystick box (hereinafter referred to as J / S) 23, a mouse 24, and a CRT 25. The computer main body 21 is configured, for example, as shown in FIG. That is, the image information of the workpiece 12 input from the CCD camera 18 is stored in the image memory 32 via the interface (hereinafter referred to as I / F) 31.

  The CAD data of the work 12 created by a CAD system (not shown) is input to the CPU 35 via the I / F 33 when, for example, offline teaching using CAD data is executed, and is developed into bitmap image information by the CPU 35. Is stored in the image memory 32. The image information stored in the image memory 32 is displayed on the CRT 25 via the display control unit 36.

  On the other hand, code information and position information input from the keyboard 22, J / S 23, and mouse 24 are input to the CPU 35 via the I / F 34. The CPU 35 performs measurement execution processing in accordance with a macro program stored in the ROM 37 and various control programs such as a measurement execution program, a measurement result display program, a part program generation program, and a part program stored in the RAM 40 from the HDD 38 via the I / F 39. Execute part program creation processing, measurement result display processing, and the like.

  The CPU 35 controls the measuring instrument main body 1 via the I / F 41 according to the measurement execution process. The HDD 38 is a recording medium that stores various control programs such as CAD data, a measurement execution program, a measurement result display program, and a part program. The RAM 40 stores various programs and provides a work area for various processes.

  FIG. 3 is a functional block diagram of the image measuring apparatus. Note that the functions shown in FIG. 3 are realized by the CPU 35 executing a program stored in the HDD 38 or the like.

  The image of the work 12 is taken by the image acquisition unit 51. The image acquisition unit 51 captures an image by driving the CCD camera 18 within a specified range of the work 12 based on the operation of the keyboard 22 and the mouse 24. The photographed workpiece image is converted into a raster image format by the workpiece image development unit 52 and stored in the storage unit 53. The coordinate system setting unit 54 performs a coordinate system setting for making the coordinate system of the workpiece image coincide with the coordinate system of the workpiece 12. The graphic selection unit 55 arranges an edge detection tool to be described later according to the operation of the mouse 24 and selects a part of the work image stored in the storage unit 53. The measurement condition setting unit 56 sets measurement conditions including types such as an edge detection tool to be described later for the work image selected by the graphic selection unit 55. The part program generation unit 57 generates a part program file based on the measurement conditions set by the measurement condition setting unit 56. The generated part program file is appropriately edited by the part program editing unit 58. The generated and edited part program file is stored in the HDD 38 or the like via the part program output unit 59.

  In addition, the information output from the graphic selection unit 55, the measurement condition setting unit 56, the part program generation unit 57, and the part program editing unit 58 described above is subjected to predetermined display settings by the display setting unit 60, and the display control unit. 36 is displayed on the CRT 25.

  The display setting unit 36 includes a specific area receiving unit 60a, a first enlargement / reduction unit 60b, a second enlargement / reduction unit 60c, and a composition unit 60d. The specific area receiving unit 60a receives specification of a specific area of the work image displayed on the CRT 25 and the edge detection tool image. Here, the specific area is an area for enlarging and reducing the image, and the specific area is designated by a mouse operation or the like by the user. The first enlargement / reduction unit 60b enlarges or reduces the edge detection tool image in the specific region at a predetermined magnification while maintaining the line width of the edge detection tool image at a constant predetermined width. The second enlargement / reduction unit 60c enlarges or reduces the work image in the specific area at a predetermined magnification (the same magnification as the first enlargement / reduction unit 60b). The composition unit 60d synthesizes the edge detection tool image enlarged or reduced by the first enlargement / reduction unit 60b and the work image enlarged or reduced by the second enlargement / reduction unit 60c.

  Next, an edge detection tool used in the image measurement apparatus will be described with reference to FIG. FIG. 4A shows the simplest tool 71 (hereinafter referred to as a simple tool), in which the density level of image information 72 obtained by imaging a workpiece changes abruptly from the proximal end to the distal end of the arrow. This is for detecting a point as an edge point. The simple tool 71 is defined by the position coordinates (X, Y) of the midpoint, its length W1, and the angle θ, and can be placed at any position on the workpiece image by a mouse operation. FIG. 6B is a rectangular box-shaped tool (hereinafter referred to as a box tool) 73, which is suitable for detecting the straight line image information 72a. The middle point position coordinates (X, Y) and arrows on both sides are shown. Defined by the length W1, the width H1 between the arrows on both sides, and the angle θ. In the case of the box tool 73, edge detection from the base end of the arrow toward the tip is repeated at a preset interval ΔH in the width H. FIG. 5C is a circular tool (hereinafter referred to as a circular tool) 74, which is suitable for detection of circular image information 72b. The position coordinates (X, Y), the inner diameter r1 for starting measurement, and the measurement Defined by the outer diameter r2. In the case of the circular tool 74, it rotates around the coordinates (X, Y) at a preset angle Δθ, and edge detection from the base end of the arrow toward the tip is repeated. In addition to the box tool and the circle tool, there are an arc tool and the like.

  Next, an image enlargement / reduction process in the image measuring apparatus configured as described above will be described with reference to FIG. 5 and FIGS. 6 to 10 as appropriate. FIG. 5 is a flowchart showing image enlargement / reduction processing. 6 to 10 show specific examples of image enlargement / reduction processing when the edge detection tool is the circular tool described above.

  First, the figure selection unit 55 accepts designation of the arrangement of the edge detection tool on the work image by a user's mouse operation or the like (step S101). For example, in step S <b> 101, when receiving the designation of the edge detection tool arrangement, the display control unit 36 displays the video window 100 shown in FIG. 6 on the CRT 25. In the video window 100, a work image 102 and an edge detection tool image 101 are displayed. Here, the video window 100 has H pixels in the vertical direction and W pixels in the horizontal direction, and the width of the line for drawing the edge detection tool image 101 is T pixels. For example, H = 1280, W = 960 (Quad-VGA), and T = 1.

  Next, the specific area receiving unit 60 receives specification of a specific area to be displayed on the CRT 25 (step S102). For example, when the designation of the specific area is accepted in step S102, the display control unit 36 displays the video window 100 shown in FIG. In the video window 100, in addition to the workpiece image 102 and the edge detection tool image 101, a specific area line 103a (or 103b, 103c) for designating a specific area is displayed. Here, FIG. 7A shows a case where a specific area line 103a of H pixels in the vertical direction and W pixels in the horizontal direction is designated. FIG. 7B shows a case where a specific area line 103b of 1 / 2H pixel in the vertical direction and 1 / 2W pixel in the horizontal direction is designated. FIG. 7C shows a case where the specific area line 103c of 1 / 4H pixel in the vertical direction and 1 / 4W pixel in the horizontal direction is designated.

  Subsequently, the first enlargement / reduction unit 60b performs coordinate conversion by enlarging or reducing the drawing data of the edge detection tool image surrounded by the specific area line so as to match the predetermined area (step S103).

  The line width of the edge detection tool image generated based on the drawing data itself subjected to coordinate conversion in step S103 is displayed thicker or thinner than the edge detection tool image before coordinate conversion. Therefore, next, the first enlargement / reduction unit 60b generates an edge detection tool image based on the drawing data after the coordinate conversion while maintaining the same predetermined line width as before the coordinate conversion (step S104). For example, in steps S103 and S104, the first enlargement / reduction unit 60b performs the process shown in FIG. FIGS. 8A to 8C correspond to FIGS. 7A to 7C. An image of an area surrounded by the specific area line 103a (or 103b, 103c) is represented by height 1. An example of conversion into an image of / 2H pixels and a width of 1/2 W pixels is shown. That is, in the case shown in FIG. 8A, an image 200a obtained by halving the edge detection tool image 101 in the region surrounded by the specific region line 103a is generated and shown in FIG. 8B. In that case, an image 200b obtained by magnifying the edge detection tool image 101 in the area surrounded by the specific area line 103b is generated, and in the case shown in FIG. 8C, the specific area line 103c is used. An image 200c obtained by doubling the edge detection tool image 101 in the enclosed region is generated. However, as shown in FIG. 8, since the edge detection tool image is generated with a predetermined width after coordinate conversion of the drawing data, even if the edge detection tool image is enlarged and reduced, The line width of the edge detection tool image before and after is held at a constant T pixel.

  Next, the second enlargement / reduction unit 60c enlarges / reduces the work image surrounded by the specific area line (step S105). For example, in step S105, the second enlargement / reduction unit 60c performs the process shown in FIG. FIGS. 9A to 9C correspond to FIGS. 7A to 7C, and show an image of a region surrounded by the specific region line 103a (or 103b, 103c) with a height of 1. An example of conversion into an image of / 2H pixels and a width of 1/2 W pixels is shown. That is, in the case shown in FIG. 9A, an image 300a obtained by halving the work image 102 in the area surrounded by the specific area line 103a is generated and shown in FIG. 9B. In this case, an image 300b obtained by sizing the work image 102 in the area surrounded by the specific area line 103b is generated, and in the case shown in FIG. 8C, the area surrounded by the specific area line 103c. An image 300c obtained by doubling the work image 102 is generated.

  Next, the synthesizing unit 60d synthesizes the edge detection tool image generated in step S104 and the work image generated in step S105 (step S106). Then, the display control unit 36 displays the composite image synthesized in step 106 on the video window (step S107). 10A to 10C correspond to FIGS. 8 and 9A to 9C. For example, in step S106 and step S107, the composition unit 60d, as shown in FIG. 10, the edge detection tool image 200a (or 200b, 200c) generated in step S104 and the work image generated in step S105. 300a (or 300b, 300c) is combined, and the display control unit 36 displays the combined image on the video window 400a (or 400b, 400c).

  Even when the edge detection tool image is enlarged and reduced by the configuration and processing of the image measuring apparatus as described above, the line width does not change. Therefore, even when the enlarged display is performed, the operability when the edge detection tool image is arranged does not deteriorate. Further, the edge detection tool can be displayed with good appearance.

It is a perspective view which shows the structure of the image measuring device which concerns on embodiment of this invention. It is a block diagram which shows the structure of the computer main body in the image measuring device which concerns on embodiment of this invention. It is a functional block diagram of an image measuring device concerning an embodiment of the invention. It is a figure which shows an example of an edge detection tool. It is a flowchart which shows the expansion / reduction process of an image. It is a figure which shows the specific example of the expansion / contraction process of an image which used the edge detection tool as the circle tool. It is a figure which shows the specific example of the expansion / contraction process of an image which used the edge detection tool as the circle tool. It is a figure which shows the specific example of the expansion / contraction process of an image which used the edge detection tool as the circle tool. It is a figure which shows the specific example of the expansion / contraction process of an image which used the edge detection tool as the circle tool. It is a figure which shows the specific example of the expansion / contraction process of an image which used the edge detection tool as the circle tool.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Measuring machine main body, 2 ... Computer system, 3 ... Printer, 11 ... Mount, 12 ... Workpiece, 13 ... Measurement table, 14, 15 ... Support arm, 16 ... X-axis guide, 17 ... Imaging unit, 18 ... CCD camera , 19 ... Position sensor, 21 ... Computer main body, 22 ... Keyboard, 23 ... Joystick box, 24 ... Mouse, 25 ... CRT, 31, 33, 34, 39, 41 ... I / F, 32 ... Image memory, 35 ... CPU 36 ... Display control unit, 37 ... ROM, 38 ... HDD, 40 ... RAM, 51 ... Image acquisition unit, 52 ... Work image development unit, 53 ... Storage unit, 54 ... Coordinate system setting unit, 55 ... Graphic selection unit, 56 ... Measurement condition setting unit, 57 ... Part program generation unit, 58 ... Part program editing unit, 59 ... Part program output unit, 60 ... Display setting unit, 60a ... Constant region accepting unit, 60b ... first scaling unit, 60c ... second scaling unit, 60d ... synthesis unit.

Claims (3)

An imaging unit for imaging a workpiece;
A display control unit that displays on the display unit the work image captured by the imaging unit, and an edge detection tool image for performing edge detection of a predetermined region of the work based on the work image;
A first enlargement / reduction unit that enlarges and reduces the edge detection tool image at a predetermined magnification while maintaining a line width of the edge detection tool image at a constant predetermined width;
A second enlargement / reduction unit that enlarges or reduces the work image at the predetermined magnification;
An edge detection tool image enlarged or reduced by the first enlargement / reduction unit, and a synthesis unit for synthesizing the work image enlarged or reduced by the second enlargement / reduction unit,
The display control unit displays an image synthesized by the synthesis unit on the display unit. A specific area receiving unit that receives specification of a specific area of the work image displayed on the display unit and the edge detection tool image;
The first enlargement / reduction unit enlarges or reduces the edge detection tool image in the specific region, and the second enlargement / reduction unit enlarges or reduces the work image in the specific region. The image measurement apparatus according to claim 1. The first enlargement / reduction unit includes:
A coordinate conversion unit for converting the drawing data of the edge detection tool image;
An edge detection tool image generation unit configured to generate an edge detection tool image in which a line width is held at the predetermined predetermined width based on the drawing data subjected to coordinate conversion by the coordinate conversion unit. The image measuring device according to claim 1 or 2.

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