TW201329509A - 3D scan device and 3D scan method thereof - Google Patents

Abstract

A 3D scan device includes a light source, a scanning-mirror component, a ranging unit and a color analyzing unit. The light source is for emitting a visible light and an invisible light. The scanning-mirror component is optically coupled to the light source for reflecting the visible light and the invisible light, so that the visible light and the invisible light can project on a sample and move along a predetermined path. The ranging unit is for receiving a reflecting invisible light reflected from the sample to calculate distance information of the sample. The color analyzing unit is for receiving a reflecting visible light reflected from the sample to calculate color information of the sample.

Description

Stereo scanning device and stereo scanning method thereof

The invention relates to a scanning device, in particular to a stereo scanning device capable of establishing surface contour information and color information of an object to be tested, and a stereo scanning method for a stereo scanning device.

The traditional 3D imaging technology performs the imaging scan of the object to be tested, and the method used for the scanning includes a 3-dimensional measuring platform or a scanner for collecting the appearance and size information of the article for use as a follow-up. The basis for the construction of 3D image models.

In general, the scanner uses a contact probe scanner to match the rotating platform. The object to be tested is placed on the rotating platform to rotate, so the contact probe scanner can obtain the two-dimensional relative position information, and the two-dimensional information obtained from the different perspectives of the object to be tested can be established through computer operation. Dimensional model of the dimension. However, the disadvantage of this technique is that the measuring device is quite bulky and difficult to carry, and the measuring speed is slow.

Moreover, the traditional 3D imaging technology can only perform computational imaging on the contour size of the object to be tested, and cannot provide information on the appearance color and composition of the surface of the object, and thus cannot meet the stringent requirements of precision measurement.

In view of this, it is an urgent problem to be solved in the industry to provide an improvement that can at least one of the above-mentioned deficiencies.

The main object of the present invention is to provide a stereo scanning device capable of establishing surface contour information and color information of an object to be tested, and a stereo scanning method for the stereo scanning device.

To achieve the above objective, a stereo scanning device according to the present invention comprises a light source group, a scanning mirror element, a ranging component and a color analysis component. The light source group is configured to emit a visible light beam and a non-visible light beam. The scanning mirror element is optically coupled to the light source group for reflecting the visible light beam and the non-visible light beam to project the visible light beam and the non-visible light beam onto a surface of an object to be tested and move along a predetermined scanning track. The ranging component is configured to receive a non-visible reflected light beam reflected from a surface of the object to be tested. The color analysis component is configured to receive a visible reflected beam reflected from a surface of the object to be tested.

To achieve the above objective, a stereo scanning method disclosed in the present invention comprises the steps of emitting a visible light beam and a non-visible light beam; and projecting the visible light beam and the non-visible light beam to an object to be measured along a predetermined scanning track. a surface; a non-visible reflected beam reflected from a surface of the object to be tested; a distance information corresponding to a surface of the object to be tested; a visible reflected beam received from a surface of the object to be tested; and calculating The color information of the surface of the object to be tested.

The above objects, technical features and advantages will be more apparent from the following description.

The invention provides a stereo scanning device and a stereo scanning method for a stereo scanning device. The stereo scanning device projects the visible light beam and the non-visible light beam, and receives the visible reflected light beam and the non-visible reflected light beam from the object to be measured to calculate distance information and color information of the surface of the object to be tested, thereby establishing a relative testable A solid three-dimensional contour model of an object.

The embodiments of the present invention are not intended to limit the invention to any particular environment, application, or special mode as described in the embodiments. In the following description, the drawings are simplified or slightly exaggerated. The components shown are not the number, shape and size ratio of the implementation, but only a selective design, so the actual component layout may be more For the sake of complexity, this is a combination of the first.

Please refer to FIG. 1 and FIG. 2 . FIG. 1 is a functional block diagram of a stereo scanning device 10 according to an embodiment of the present invention, and FIG. 2 is a partial optical path of the stereo scanning device 10 according to an embodiment of the present invention. schematic diagram. The stereo scanning device 10 can be used for scanning measurement of the color and shape of an object A to be tested. The stereo scanning device 10 includes a light source group 12, a scanning mirror element 14, a beam splitting mirror group 16, a ranging component 18, a color analyzing component 20 and an analyzing unit 22.

The light source group 12 includes a visible light source 121 and a non-visible light source 122 for respectively emitting a visible light beam 1211 and a non-visible light beam 1221. As shown in FIG. 2, the visible light source 121 can include a red visible laser light source 121R, a green visible laser light source 121G, and a blue visible laser light source 121B for respectively emitting a blue visible laser beam 1211B. , green visible laser beam 1211G or red visible laser beam 1211R. The optical paths through which the blue visible laser beam 1211B, the green visible laser beam 1211G, or the red visible laser beam 1211R travel are actually designed to be parallel to each other and in close proximity (or overlap) to facilitate combining into a visible light beam 1211.

In this embodiment, the visible light source 121 can simultaneously select the visible light sources of the above three primary colors, or select one of them to provide a monochromatic blue visible laser beam 1211B, a green visible laser beam 1211G or a red visible Laser beam 1211R. In other alternative modes of operation, the visible light source 121 can sequentially emit visible light beams of three primary colors, and perform contour scanning in a time-hopping manner with time intervals, but not limited thereto. As for the non-visible light source 122, one of an infrared light source or an ultraviolet light source may be included.

Further, the specific mode of performing the contour scanning in the jumping mode can be exemplified as: when the visible light source 121 is in the first, fourth and seventh time intervals, only the blue visible laser beam 1211B is emitted; When the visible light source 121 is in the second, fifth, and eighth time intervals, only the green visible laser beam 1211G is emitted; when the visible light source 121 is in the third, sixth, and ninth time intervals, only the red visible thunder is emitted. The beam 1211R. Therefore, the color analysis component 20 only needs to receive and process the visible reflected monochromatic light beam received during the time interval in each time interval, thereby avoiding unnecessary false detection caused by other color light interference. In this jump mode, the present embodiment can selectively use the simple color analysis component 20 with low structural complexity, thereby achieving the purpose of reducing the overall cost and volume of the stereo scanning device.

The scanning mirror element 14 is optically coupled to the light source group 12 for reflecting the visible light beam 1211 and the non-visible light beam 1221 to project the visible light beam 1211 and the non-visible light beam 1221 onto the surface of the object A to be tested, and along a predetermined The scanning track moves to perform a comprehensive structural scan of the object A to be measured.

In particular, the scanning mirror element 14 is a Micro Electro Mechanical Systems (MEMS) having an electrically drivable mirror 141. The mirror 141 can be rotated and oscillated along two mutually interlaced axes (not shown). When the visible light beam 1211 and the non-visible light beam 1221 arrive at the mirror 141 of the scanning mirror element 14, and then reflected onto the surface of the object A to be measured, a visible light point P and a non-visible light point Q are formed. When the mirror 141 is rotated along two mutually interlaced axes, the visible point P and the invisible point Q formed on the surface of the object A to be measured are moved along the predetermined scanning trajectory to scan the contour of the object A to be measured.

The above description of the scanning mirror element 14, the mirror 141, and the scanning trajectory can be obtained, at least by reference to the following U.S. patent applications: US 2011/0164223, US 2005/0280331, US 6359718 and US 2009/0284622.

The beam splitter group 16 can be disposed between the light source group 12 and the scanning mirror element 14. The visible light beam 1211 and the non-visible light beam 1221 emitted by the light source group 12 pass through the beam splitter group 16 to condense to the scanning mirror element 14, and then the scanning mirror element 14 can simultaneously project the visible light beam 1211 and the non-visible light beam 1221 to The object A to be tested is used for scanning measurement.

It is worth mentioning that, since the beam splitter group 16 can make the visible light beam 1211 and the non-visible light beam 1221 travel parallel and close to each other (or overlap), the moving track of the visible light point P and the non-visible light point Q is in principle Convergence and synchronization.

In other words, the use of the beam splitter group 16 allows the visible light beam 1211 after the optical path conversion and the non-visible light beam 1221 closely adjacent to the visible light beam 1211 to be combined to form a light spot (that is, the visible light point P and the non-visible light point Q can be regarded as A spot L) is projected onto the scanning mirror element 14. In this embodiment, the beam splitter group 16 may include a plurality of beam splitters 161a, 161b, 161c, and 161d, wherein each of the beamsplitters is used to convert the light paths of the visible light source 121 and the non-visible light source 122 of the light source group 12, respectively. The application aspect is not limited to this.

The ranging component 18 can be a non-visible beam sensor, such as an infrared light sensor or an ultraviolet light sensor, which can be coupled to the analysis unit 22. The ranging component 18 is configured to receive a non-visible reflected beam 1222 reflected from the surface of the object A to be tested, and transmit the sensing information to the analyzing unit 22 for calculating the distance measuring component 18 and the surface of the measuring object A. A distance information.

In particular, one of the ranging elements 18, the non-visible sensing element 181, is used to receive the non-visible reflected beam 1222. The phase comparator 182 of the ranging component 18 receives a first phase signal 1223 from the non-visible light source 122, and receives a second phase signal 1224 from the non-visible light sensing component 181, and compares the two phase signals according to the digital signal processing mode ( For example, the phase difference between the square wave clock signal and the periodic signal of the equally spaced clock is used to calculate the distance information between the distance measuring element 18 and the surface of the object A.

In addition, since the scanning mirror element 14 is directed to a plane perpendicular to the vector of the distance information, the non-visible light beam 1221 is projected along the predetermined scanning contour to perform a return scanning, so that the stereo scanning device 10 can effectively obtain The distance information of each block in the plane boundary of one of the objects A is measured, thereby combining a precise surface contour information.

Color analysis component 20 can be a visible beam sensor that can be coupled to analysis unit 22. The color analyzing component 20 is configured to receive the visible reflected light beam 1212 from one of the surfaces of the object A to be measured, and analyze the chroma value of the visible reflected light beam 1212, and receive the red visible laser light source 121R from the red visible laser light source 121R and A chroma signal 1213 of the laser source 121B is visible in blue, wherein the chroma signal 1213 includes an initial chroma value of the visible reflected beam 1211. In other words, the color analysis component 20 calculates the color information of one of the surfaces of the object A to be tested based on the chroma values of the visible reflected light beam 1212 and the visible light beam 1211 and through the analyzing unit 22.

It should be noted that since the chroma value of the chroma signal 1213 and the visible reflected beam 1212 including the initial chroma value may be represented by an analog signal that is not displayed in a square wave type, the color analysis component 20 and the analysis unit 22 are analogous. The signal method is analyzed and processed, but not limited to this.

For example, when the scanning mirror element 14 projects the visible light beam 1211 along the predetermined scanning trajectory to the plane of the vector of the distance information of the object A to be measured, the analyzing unit 22 can receive the visible reflection through the color analyzing component 20. The light beam 1212 is used to calculate the color information of each block in the plane of the object A to be measured, and cooperate with the surface contour information obtained by the distance measuring component 18 to establish a stereoscopic contour model of the color.

To ensure that the ranging component 18 and the color analysis component 20 can obtain excellent sensing capability, the stereo scanning device 10 can optionally include a collecting lens 19 disposed at the receiving beam end of the ranging component 18 and the color analyzing component 20. prior to. The concentrating lens 19 can be a convex lens for assisting in focusing the non-visible reflected beam 1222 and the visible reflected beam 1212 to be projected to the ranging element 18 and the color analysis element 20, respectively.

In addition, the stereo scanning device 10 may further include a rotating platform 13 for carrying and rotating the object A to be tested. The stereo scanning device 10 can only scan the stereoscopic contour information of the object A to face the scanning mirror element 14, the distance measuring component 18 and the color analysis component 20, so that the scan is rotated with the rotation of the rotating platform 13. The mirror element 14 can project the visible light beam 1211 and the non-visible light beam 1221 to different surfaces of the object A to be measured, thereby obtaining surface contour information of the object A to be measured at different angles, and integrating the same to establish an object to be tested. A complete three-dimensional contour model.

It is worth mentioning that the rotating platform 13 is an optional component configuration. Please refer to FIG. 3, which is a diagram for explaining the use of the stereo scanning device 10 according to another embodiment of the present invention. The user can use a plurality of stereo scanning devices 10 that do not have a rotating platform to surround them at respective angles of the object A to be tested. The plurality of stereo scanning devices 10 are each established on the surface contour information of the object A to be measured at the viewing angle thereof, and finally the plurality of surface contour information are sequentially joined, and a complete stereoscopic contour model of the object A to be measured can also be established.

Further, the ranging component 18 or the color analysis component 20 can further cooperate to analyze the spectral information of the non-visible reflected beam 1222 and the visible reflected beam 1212 to obtain surface material information of the object A to be tested. The application and operation principle are as described above, so it will not be described in detail here.

Please refer to FIG. 4, which is a flow chart of a stereo scanning method according to an embodiment of the present invention. The method includes:

Step 400: The light source group 12 emits a visible light beam 1211 and a non-visible light beam 1221.

Step 402: The beam splitter group 16 aggregates the visible light beam 1211 and the non-visible light beam 1221 into a light spot L for projection onto the scanning mirror element 14.

Step 404: The scanning mirror element 14 projects the visible light beam 1211 and the light spot L formed by the non-visible light beam 1221 along the predetermined scanning track to the surface of the object A to be tested.

Step 406: The ranging component 18 receives the non-visible reflected beam 1222 reflected from the surface of the object A to be tested.

Step 408: The analyzing unit 22 calculates the distance information corresponding to the surface of the object A to be tested according to the data received by the ranging component 18.

Step 410: The analyzing unit 22 obtains the surface contour information of the object A to be tested according to the complex array distance information of the object A to be measured.

Step 412: The color analysis component 20 receives the visible reflected light beam 1212 reflected from the surface of the object A to be tested.

Step 414: The analyzing unit 22 calculates color information corresponding to the surface of the object A to be tested according to the data received by the color analyzing component 20.

Step 416: Rotate the object A to be measured by the rotating platform 13 so that the scanning mirror element 14 can project the visible beam 1211 and the non-visible beam 1221 onto different surfaces of the object A to be tested.

Step 418: The analyzing unit 22 combines the distance information, the surface contour information and the color information of the object A to be measured, and establishes a three-dimensional contour model corresponding to the object A to be tested.

Step 420: End.

The above steps will be described in detail herein. The stereo scanning device 10 transmits the visible light beam 1211 and the non-visible light beam 1221 emitted by the light source group 12 into a light spot L through the scanning mirror element 14 and the beam splitting mirror group 16 to be projected onto the surface of the object A to be tested. The scanning mirror element 14 can then be moved along the predetermined scanning trajectory, for example along an S-shaped curve, such that the spot L can be projected sequentially and stepwise onto the respective blocks of the surface of the object A to be tested.

When the spot L is projected onto the surface of the object A to be measured, the ranging component 18 and the color analyzing component 20 can respectively receive the non-visible reflected beam 1222 and the visible reflected beam 1212 from the object A to be measured, and pass through the analyzing unit 22 to Calculate the distance information, surface contour information and color information of the object A to be tested.

In detail, the non-visible light beam 1221 projected onto the object A to be measured and the non-visible reflected light beam 1222 reflected from the surface of the object A to be tested have a phase difference, and the analyzing unit can detect the phase obtained through the ranging component 18. The amount of change calculates the amount of delay of the round trip of the beam, thereby obtaining the distance information relationship between the mirror element 14, the object A to be measured and the distance measuring element 18, and further obtaining the object A to be tested along the predetermined scanning path. Surface contour information.

In addition, the visible beam 1211 can be a white light beam that is interspersed with a plurality of color beams. When the white light beam is projected onto the object A to be measured, the light beam corresponding to the color of the block of the surface of the object A to be measured is absorbed, so the color analyzing element 20 can be used to analyze what the visible reflected light beam 1212 lacks compared to the visible light beam 1211. The color beam, which means that the light of the band is lacking, can effectively judge the color information of the block of the object A to be measured, and then match the surface contour information obtained by the distance measuring component 18 to establish the complete object A to be tested. Stereo contour model.

Please refer to FIG. 5. FIG. 5 is a flow chart of a stereo scanning method according to another embodiment of the present invention. The method includes:

Step 500: The light source group 12 emits a visible light beam 1211 and a non-visible light beam 1221.

Step 502: The beam splitter group 16 aggregates the visible light beam 1211 and the non-visible light beam 1221 into a light spot L for projection onto the scanning mirror element 14.

Step 504: The scanning mirror element 14 projects the visible light beam 1211 and the light spot L formed by the non-visible light beam 1221 along the predetermined scanning track to the surface of the object A to be tested.

Step 506: The ranging component 18 receives the non-visible reflected light beam 1222 reflected from the surface of the object A to be tested.

Step 508: The analyzing unit 22 calculates the distance information corresponding to the surface of the object A to be tested according to the data received by the ranging component 18.

Step 510: The analyzing unit 22 obtains the surface contour information of the object A to be tested according to the complex array distance information of the object A to be measured.

Step 512: The color analysis component 20 receives the visible reflected light beam 1212 reflected from the surface of the object A to be tested.

Step 514: The analyzing unit 22 calculates the color information corresponding to the surface of the object A to be tested according to the data received by the color analyzing component 20.

Step 516: The scanning mirror element 14 projects the visible light beam 1211 and the non-visible light beam 1221 from different positions on the different surfaces of the object A to be tested from at least two different positions.

Step 518: The analyzing unit 22 combines the distance information, the surface contour information and the color information of the object A to be measured, and establishes a three-dimensional contour model corresponding to the object A to be tested.

Step 520: End.

The difference between the embodiment and the foregoing embodiment is that the stereo scanning device 10 of the embodiment can scan the object A to be tested from at least two different positions to obtain surface contour information of different viewing angles, and then assemble from different regions. The surface contour information of the viewing angle to form a three-dimensional contour model of the object A to be measured.

For example, the user can set a plurality of stereo scanning devices 10 at different viewing angles of the object A to be tested, and the stereo scanning device 10 performs distance information, surface contour information, and color information calculation and analysis methods as described above. It is described in the embodiment, so it will not be described here. The feature of the embodiment is that each of the stereo scanning devices 10 obtains surface contour information of the object A to be measured at different viewing angles, and then combines the surface contour information to establish a complete three-dimensional contour model.

The above is a flow description of a stereo scanning device and a stereo scanning method applied to the stereo scanning device according to a preferred embodiment of the present invention. The invention has the following advantages:

1. The invention provides an object scanning technology and a three-dimensional model imaging technology, wherein the technology can simultaneously measure the color and shape of the object to be measured, and further includes detailed information such as appearance color information and composition material information of the object to be measured. Measurement technology.
2. The invention provides an instant three-dimensional model imaging technology, which can provide an inspection of the size and related position of the object to be tested, so as to quickly obtain an accurate three-dimensional contour model.
3. The three-dimensional scanning device of the invention has the advantages of light volume, fast measuring time and convenient carrying, and can be elastically applied to the establishment of a three-dimensional contour model of various types of objects to be tested.

The embodiments described above are only intended to illustrate the embodiments of the present invention, and to explain the technical features of the present invention, and are not intended to limit the scope of protection of the present invention. Any changes or equivalents that can be easily made by those skilled in the art are within the scope of the invention. The scope of the invention should be determined by the scope of the claims.

10. . . Stereo scanning device

12. . . Light source group

121. . . Visible light source

121B. . . Blue visible laser source

121G. . . Green visible laser source

121R. . . Red visible laser source

1211. . . Visible beam

1211B. . . Blue visible laser beam

1211G. . . Green visible laser beam

1211R. . . Red visible laser beam

1212. . . Visible reflected beam

1213. . . Chroma signal

122. . . Non-visible light source

1221. . . Non-visible beam

1222. . . Non-visible reflected beam

1223. . . First phase signal

1224. . . Second phase signal

13. . . Rotating platform

14. . . Scanning mirror element

141. . . Reflector

16. . . Beam splitter

161a, 161b, 161c, 161d. . . Beam splitter

18. . . Ranging component

181. . . Non-visible light sensing element

182. . . Phase comparison component

19. . . Condenser lens

20. . . Color analysis component

twenty two. . . Analysis unit

A. . . Object to be tested

L. . . light spot

P. . . Visible light point

Q. . . Non-visible point

400~420, 500~520. . . step

1 is a functional block diagram of a stereo scanning device according to an embodiment of the present invention;

2 is a schematic view showing a part of an optical path of a stereo scanning device according to an embodiment of the present invention;

3 is an explanatory view of the use of a stereo scanning device according to another embodiment of the present invention;

4 is a flow chart of a stereo scanning method according to an embodiment of the present invention;

FIG. 5 is a flow chart of a stereo scanning method according to another embodiment of the present invention.

10. . . Stereo scanning device

12. . . Light source group

121. . . Visible light source

1211. . . Visible beam

1212. . . Visible reflected beam

122. . . Non-visible light source

1221. . . Non-visible beam

1222. . . Non-visible reflected beam

1223. . . First phase signal

13. . . Rotating platform

14. . . Scanning mirror element

16. . . Beam splitter

18. . . Ranging component

19. . . Condenser lens

20. . . Color analysis component

twenty two. . . Analysis unit

A. . . Object to be tested

L. . . light spot

P. . . Visible light point

Q. . . Non-visible point

Claims (14)

A stereo scanning device comprising:
a light source group for emitting a visible light beam and a non-visible light beam;
a scanning mirror element optically coupling the light source group, the scanning mirror element for reflecting the visible light beam and the non-visible light beam to project the visible light beam and the non-visible light beam onto a surface of an object to be tested and along a predetermined scan trajectory movement;
a ranging component for receiving a non-visible reflected beam reflected from a surface of the object to be tested; and a color analyzing component for receiving a visible reflected beam reflected from a surface of the object to be tested. The stereo scanning device according to claim 1, further comprising:
A beam splitter group, the visible light beam emitted by the light source group and the non-visible light beam are collected by the beam splitter group on the scanning mirror element for projection to the object to be tested. The stereo scanning device of claim 1, wherein the distance measuring component further uses the scanning mirror element to project the non-visible light beam along the predetermined scanning track to obtain surface contour information of the object to be tested. The stereo scanning device of claim 1, wherein the light source group comprises one of an infrared light source or an ultraviolet light source. The stereo scanning device according to claim 1, further comprising:
a rotating platform for carrying and rotating the object to be tested, the scanning mirror element projecting the visible light beam and the non-visible light beam to different surfaces of the object to be tested as the rotating platform rotates. The stereo scanning device of claim 1, wherein the distance measuring component calculates a distance information of the surface of the object to be tested according to a phase difference between the non-visible reflected beam and the non-visible beam. The stereo scanning device of claim 1, wherein the color analysis component calculates color information of the surface of the object to be tested according to the visible light beam and the chroma value of the visible light beam. A stereo scanning method comprising the steps of:
Transmitting a visible beam and a non-visible beam;
Projecting the visible light beam and the non-visible light beam onto a surface of an object to be tested along a predetermined scanning track;
Receiving a non-visible reflected light beam reflected from a surface of the object to be tested;
Calculate the distance information corresponding to the surface of the object to be tested;
Receiving a visible reflected beam reflected from a surface of the object to be tested; and calculating a color information of the surface of the object to be tested. The method of claim 9, further comprising the steps of:
After the visible light beam and the non-visible light beam are aggregated into a light spot, the light spot is projected along the predetermined scanning track to the surface of the object to be tested. The method of claim 9, further comprising the steps of:
The non-visible light beam is projected along the predetermined scanning trajectory to obtain surface contour information of the object to be tested. The method of claim 9, further comprising the steps of:
Rotating the object to be tested and projecting the visible beam and the non-visible beam onto different surfaces of the object to be tested. The method of claim 9, further comprising the steps of:
The visible light beam and the non-visible light beam are projected onto different surfaces of the object to be tested from at least two different positions. The method of claim 9, wherein calculating the distance information corresponding to the surface of the object to be tested comprises:
And determining the distance information of the surface of the object to be tested according to a phase difference between the non-visible reflected beam and the non-visible beam. The method of claim 9, wherein calculating the color information of the surface of the object to be tested comprises:
And determining the color information of the surface of the object to be tested according to the chroma value of the visible reflected beam and the visible beam.