TW201416640A - Method and device for measuring 3-D article without contacting - Google Patents

Abstract

A method and a device for measuring a 3-D article without contacting are provided. The method for measuring the 3-D article without contacting comprises the following steps. A 3-D contour model of a 3-D article is provided. A capturing route is created according to the 3-D contour model. A 2-D image is captured by an image capturing unit according to the capturing route. A 2-D contour model is drawn on the 2-D image; or the size of the 2-D image is measured. The 2-D contour model is created according to the capturing route and the 3-D contour model.

Description

Non-contact three-dimensional object measuring method and device

The invention relates to a three-dimensional object measuring method and device, and in particular to a non-contact three-dimensional object measuring method and device.

With the vigorous development of industry, the traditional two-dimensional detection method can not meet the complex three-dimensional object to be tested. Therefore, there is also a three-dimensional measuring instrument on the market to measure the complex object to be tested. In general, the three-dimensional measuring instrument uses contact measurement. The contact type three-dimensional measuring instrument directly measures the size by contacting the probe with the object to be tested. The disadvantage of this method is that the speed is slow and there is also a concern that the surface of the object to be tested is damaged.

The invention relates to a non-contact three-dimensional object measuring method and device, which utilizes a non-contact method for measuring three-dimensional objects.

According to an aspect of the invention, a non-contact three-dimensional object measuring method is proposed. The non-contact three-dimensional object measuring method includes the following steps. A three-dimensional contour model of a three-dimensional object is provided. According to the three-dimensional contour model, an image capturing path is established. According to the image capturing path, a two-dimensional image of the three-dimensional object is captured by an image capturing unit. Draw a 2D contour model on a 2D image, or measure the size of a 2D image. The 2D contour model is based on the image acquisition path and the 3D contour model.

According to another aspect of the present invention, a non-contact three-dimensional object measuring device is proposed. The non-contact three-dimensional object measuring device comprises a storage unit, a processing unit, an image capturing unit, a mobile unit and a display unit. The storage unit stores a three-dimensional contour model of a three-dimensional object. The processing unit establishes an image capturing path or measures the size of one of the two-dimensional images of the three-dimensional object according to the three-dimensional contour model. The moving unit is configured to move the image capturing unit according to the image capturing path, so that the image capturing unit captures the two-dimensional image of the three-dimensional object. The display unit is used to display a two-dimensional image. The processing unit draws a two-dimensional contour model on the two-dimensional image or measures the size of the two-dimensional image. The processing unit establishes a two-dimensional contour model according to the image capturing path and the three-dimensional contour model.

In order to make the above-mentioned contents of the present invention more comprehensible, various embodiments are described below, and in conjunction with the drawings, the detailed description is as follows:

The following is a detailed description of various embodiments, which are intended to be illustrative only and not to limit the scope of the invention. Further, the drawings in the embodiments are omitted to partially illustrate the technical features of the present invention.

First embodiment

Please refer to FIG. 1 , which is a schematic diagram of the non-contact three-dimensional object measuring device 1000 of the first embodiment. The three-dimensional object measuring device 1000 includes a storage unit 110, a processing unit 120, an image capturing unit 130, a moving unit 140, and a display unit 150. The storage unit 110 is configured to store various materials, such as a hard disk, a memory, or a compact disk. The processing unit 120 is configured to perform various operations and processing procedures, such as an image processing chip, a micro processing chip, a firmware circuit, or one of storing a plurality of codes. Record media. The image capturing unit 130 is configured to capture an image, such as a camera, a camera, or a handheld electronic device having a lens. The mobile unit 140 moves certain objects with automation techniques. The mobile unit 140 is, for example, a robotic arm, a track device, a rotating platform, a suspension device, or a combination thereof. The display unit 150 is configured to output various screens, such as a display screen, a plotter, or a printer.

In this embodiment, the non-contact measurement of the three-dimensional object 900 is performed through the above various components to compare whether the length, angle and contour of the three-dimensional object 900 meet predetermined specifications. The three-dimensional object 900 does not need to be contacted by any mechanical device or probe during the measurement process.

Referring to FIG. 2, a flow chart of the non-contact three-dimensional object measuring method of the first embodiment is shown. In the present embodiment, the flow step is described by taking the non-contact three-dimensional object measuring device 1000 of FIG. 1 as an example.

In step S101, a three-dimensional contour model of the three-dimensional object 900 is provided by the storage unit 110. The three-dimensional contour model is constructed, for example, by Computer Aided Design (CAD). The 3D contour model contains contours of various parts at various angles of view. Please refer to FIG. 1 and FIG. 3 . FIG. 3 is a schematic diagram showing another perspective of the three-dimensional object 900 of FIG. 1 . The two perspectives of the three-dimensional object 900 are shown in Figures 1 and 3, respectively. That is to say, as long as a certain part of the three-dimensional object 900 and a certain angle of view are specified, a corresponding two-dimensional contour model can be obtained.

In step S102, the processing unit 120 establishes an image capturing path according to the three-dimensional contour model. The image capture path can be a sequential set of multiple capture points or a single capture point. When the volume of the three-dimensional object is small, the image taking path may be a single image taking point; in the three-dimensional object, the volume is large, and the image path is taken. The path can be multiple image points. The setting of the image capturing path includes a three-dimensional image capturing position (the X axis, the Y axis, and the Z axis position where the image capturing device is located) and a θ axis.

In another embodiment, the setting of the image taking path further includes an image capturing range. In the case where the image capturing unit 130 has a zoom lens, the image capturing range can be controlled by the optical zoom system or the digital zoom system of the image capturing unit 130. When the fineness of the equivalent measurement is required to be high, the image capturing range can be reduced so that the detailed image can be enlarged. When the range of the equivalent measurement is required to be wide, the image capturing range can be enlarged to enable a wide range of images to be captured.

In step S103, the image capturing unit 130 captures a two-dimensional image 800 of the three-dimensional object 900 according to the image capturing path (shown in the display unit 150 and FIG. 4 in FIG. 1). In this embodiment, the moving unit 140 can move the image capturing unit 130 in three moving directions, for example, an X axis, a Y axis, and a Z axis, so that the image capturing unit 130 can be moved to a defined shape. 3D image capture position. In addition to moving the image capturing unit 130, the moving unit 140 can further rotate the image capturing unit 130 by using the θ axis to make the image capturing unit 130 face the defined three-dimensional image capturing direction. In this way, the image capturing unit 130 can align the portion of the three-dimensional object 900 to be measured.

In another embodiment, the processing unit 120 can further control the zoom lens of the image capturing unit 130 to enable the image capturing unit 130 to correspond to the defined imaging range.

Please refer to FIG. 4 , which is a schematic diagram of a two-dimensional image 800 of the three-dimensional object 900 of the first embodiment. In step S104, the processing unit 120 measures the size of the two-dimensional image 800 on the two-dimensional image 800, for example, the length. D1.

In step S105, the processing unit 120 draws a grid line 700 on the two-dimensional image 800. All of the spacings D700a, D700b of the gridlines 700 may be substantially the same; or the spacing between the gridlines 700 D700a may be different from the spacing of the gridlines 700 by D700b; or the spacing between the gridlines 700 may not be exactly the same; or The grid lines 700 may not be exactly the same distance between the D700b. Through the automatic presentation of the grid lines 700, the user can also easily measure the size of the two-dimensional image 800 (for example, the length D1).

In another embodiment, step S105 may not be performed, but the measurement is automatically performed by the processing unit 120 to calculate the size of the two-dimensional image 800 (for example, the length D1).

Further, step S105 may be performed after step S103 or after step S104; or simultaneously with step S104.

Through the above non-contact three-dimensional object measuring method and apparatus 1000, the surface of the three-dimensional object 900 can be prevented from being scratched without contacting the surface of the three-dimensional object 900. In the measurement process, only the two-dimensional image 800 can be captured for comparison, and no mechanical physical measurement is required, so that the measurement speed can be accelerated.

Second embodiment

Please refer to FIG. 5 , which illustrates a schematic diagram of a two-dimensional image 800 of the second embodiment. The difference between this embodiment and the first embodiment lies in the size measured by the two-dimensional image 800, and the rest of the same is not repeated.

In this embodiment, the processing unit 120 can directly measure the angle θ 1 of the two-dimensional image 800 without contacting the surface of the three-dimensional object 900, so that the surface of the three-dimensional object 900 can be prevented from being scratched. In the measurement process, only the two-dimensional image 800 can be captured for comparison, and no mechanical physical measurement is required, so that the measurement speed can be accelerated.

Third embodiment

Please refer to FIG. 6A to FIG. 6B , FIG. 6A is a schematic diagram of a two-dimensional contour model 930 of the third embodiment, and FIG. 6B is a schematic diagram of a two-dimensional image 800 of the third embodiment. This embodiment differs from the first embodiment in the steps of drawing the two-dimensional contour model 930, and the rest of the similarities are not repeated.

As shown in FIG. 6A, the two-dimensional contour model 930 is an outline of a three-dimensional object 900 (shown in FIG. 1). The two-dimensional contour model 930 has a model reference point 930a. The two-dimensional image 800 has an image reference point 800c. The step S104 (shown in FIG. 2) of drawing the two-dimensional contour model 930 on the two-dimensional image 800 overlaps. The model reference point 930a and the image reference point 800c are such that the two-dimensional contour model 930 is drawn at a corresponding position of the two-dimensional image 800.

Since the two-dimensional contour model 930 and the two-dimensional image 800 all correspond to the same three-dimensional image capturing position, three-dimensional image capturing direction, and image capturing range, the two-dimensional contour model 930 and the two-dimensional image 800 should theoretically be compatible.

The processing unit 120 can compare the two-dimensional image 800 and the two-dimensional contour model 930 to automatically analyze the difference between the two-dimensional image 800 and the two-dimensional contour model 930 without contacting the surface of the three-dimensional object 900, thereby avoiding the three-dimensional object 900. The surface was scratched. And only need to 撷 during the measurement process The two-dimensional image 800 can be compared for comparison, and no mechanical physical measurement is required, so that the measurement speed can be accelerated.

In view of the above, the present invention has been disclosed in various embodiments, and is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

1000‧‧‧ Non-contact three-dimensional object measuring device

110‧‧‧ storage unit

120‧‧‧Processing unit

130‧‧‧Image capture unit

140‧‧‧Mobile unit

150‧‧‧ display unit

700‧‧‧ grid lines

800‧‧‧2D image

800c‧‧ ‧ image reference point

900‧‧‧3D objects

930‧‧‧3D contour model

930a‧‧‧Model reference point

D1‧‧‧ length

D700a, D700b‧‧‧ spacing

S101, S102, S103, S104, S105‧‧‧ process steps

X, Y, Z, θ ‧‧‧ axial

θ 1‧‧‧ angle

FIG. 1 is a schematic view showing the non-contact three-dimensional object measuring device of the first embodiment.

FIG. 2 is a flow chart showing the non-contact three-dimensional object measuring method of the first embodiment.

Figure 3 is a schematic view showing another perspective of the three-dimensional object of Figure 1.

FIG. 4 is a schematic view showing a two-dimensional image of the three-dimensional object of the first embodiment.

FIG. 5 is a schematic diagram showing a two-dimensional image of the second embodiment.

FIG. 6A is a schematic diagram showing a two-dimensional contour model of the third embodiment.

FIG. 6B is a schematic diagram showing a two-dimensional image of the third embodiment.

S101~S105‧‧‧ Process steps

Claims (20)

A non-contact three-dimensional object measuring method includes: providing a three-dimensional contour model of a three-dimensional object; and establishing an image capturing path according to the three-dimensional contour model; and capturing the three-dimensional image by an image capturing unit according to the image capturing path A two-dimensional image of the object; and drawing a two-dimensional contour model on the two-dimensional image, or measuring the size of the two-dimensional image, the two-dimensional contour model is established according to the image capturing path and the three-dimensional contour model. The non-contact three-dimensional object measuring method according to claim 1, wherein in the step of establishing the image capturing path, the image capturing path comprises a three-dimensional image capturing position and a three-dimensional image capturing direction. The non-contact three-dimensional object measuring method of claim 2, wherein in the step of establishing the image capturing path, the image capturing path further comprises an image capturing range. The non-contact three-dimensional object measuring method of claim 1, further comprising: drawing a grid line on the two-dimensional image. The non-contact three-dimensional object measuring method according to claim 4, wherein in the step of drawing the grid lines, the grid lines are substantially the same distance. The non-contact three-dimensional object measuring method according to claim 1, wherein the two-dimensional contour model has a model reference point, and the two-dimensional image has an image reference point, and the two-dimensional image is drawn on the two-dimensional image. In the step of the dimension contour model, the model reference point and the image reference point are overlapped. The two-dimensional contour model is drawn at a corresponding position of the two-dimensional image. The non-contact three-dimensional object measuring method according to claim 1, wherein in the step of measuring the size of the two-dimensional image, the size of the two-dimensional image comprises a length. The non-contact three-dimensional object measuring method according to claim 1, wherein in the step of measuring the size of the two-dimensional image, the size of the two-dimensional image includes an angle. The non-contact three-dimensional object measuring method according to claim 1, wherein in the step of establishing the two-dimensional contour model, the two-dimensional contour model includes an outline of the three-dimensional object. A non-contact three-dimensional object measuring device comprises: a storage unit for storing a three-dimensional contour model of a three-dimensional object; and a processing unit for establishing an image capturing path or measuring one of the three-dimensional objects according to the three-dimensional contour model The size of the two-dimensional image; an image capturing unit; a moving unit for moving the image capturing unit according to the image capturing path, so that the image capturing unit captures a two-dimensional image of the three-dimensional object; a display unit for displaying the two-dimensional image, the processing unit drawing a two-dimensional contour model on the two-dimensional image, or measuring the size of the two-dimensional image, the processing unit is based on the image capturing path and the three-dimensional contour Model to establish the two-dimensional contour model. The non-contact three-dimensional object measuring device according to claim 10, wherein the image capturing path comprises a three-dimensional image capturing position and a three-dimensional image capturing direction. The non-contact three-dimensional object measuring device according to claim 11, wherein the image taking path further comprises an image capturing range. The non-contact three-dimensional object measuring device according to claim 10, wherein the processing unit further draws a grid line on the two-dimensional image. The non-contact three-dimensional object measuring device according to claim 13, wherein the grid lines are substantially the same distance. The non-contact three-dimensional object measuring device according to claim 10, wherein the two-dimensional contour model has a model reference point, the two-dimensional image has an image reference point, and the processing unit overlaps the model reference point and The image reference point is such that the two-dimensional contour model is drawn at a corresponding position of the two-dimensional image. The non-contact three-dimensional object measuring device according to claim 10, wherein the size of the two-dimensional image comprises a length. The non-contact three-dimensional object measuring device according to claim 10, wherein the size of the two-dimensional image comprises an angle. The non-contact three-dimensional object measuring device according to claim 10, wherein the two-dimensional contour model comprises an outline of the three-dimensional object. The non-contact three-dimensional object measuring device according to claim 10, wherein the moving unit is configured to move the image capturing unit in three moving directions. The non-contact three-dimensional object measuring device according to claim 19, wherein the moving unit is further configured to swing or rotate the image capturing unit.