KR20120021123A

KR20120021123A - 3-dimensional scanner device

Info

Publication number: KR20120021123A
Application number: KR1020100085186A
Authority: KR
Inventors: 김도현
Original assignee: 김도현
Priority date: 2010-08-31
Filing date: 2010-08-31
Publication date: 2012-03-08

Abstract

PURPOSE: A three-dimensional scanner device is provided to scan all the spaces because scanning beam detects reflection signal of light, entering nearly in vertical to the objects. CONSTITUTION: A three-dimensional scanner device comprises a housing(102), a protective cap(104), a light source, a projection lens, a reflective mirror(122), a high-magnification lens, and an image sensor(140). The protective cap is arranged in the front of the housing. The light source is installed inside the housing and generates light for irradiating to a scanning object(50). The projection lens is installed in the front of the light source in the housing and collects the light. The reflective mirror is installed in the protective cap. The high-magnification lens is installed in the housing and collects the light reflected from the scanning object. The image sensor is installed in the housing. The collected light is transferred to electric image signals by the high-magnification lens.

Description

3D scanner device {3-Dimensional Scanner Device}

The present invention relates to a three-dimensional scanning device for obtaining three-dimensional shape data of a three-dimensional object, and more particularly, to a non-contact three-dimensional scanning device.

Three-dimensional shape measurement of objects is widely applied in various fields such as inspection of workpieces, CAD / CAM, medical care, and solid modeling. The three-dimensional scanner refers to an apparatus for measuring three-dimensional shape of a three-dimensional object to obtain three-dimensional shape data.

One example of the three-dimensional scanner is a contact type three-dimensional scanner that measures the overall curved shape by measuring the spatial coordinates by one point while contacting along the surface of the object. However, such a contact three-dimensional scanner has a problem that excessive measurement time is required.

Accordingly, recently, a non-contact three-dimensional scanner for optically measuring a three-dimensional shape of an object has been widely used in order to solve the shortcomings of the contact three-dimensional measuring instrument and increase the measurement efficiency. In general, a non-contact three-dimensional scanner irradiates light on an object by a projector and analyzes the reflected light to measure the curved shape of the object. In irradiating and analyzing light, a method of using a laser as a light emitted from a projector and measuring a propagation time of light, or using general light and determining a position of each point by triangulation is widely used. In the case of using general light, patterned light or modulated light having a different phase pattern may be used to increase measurement accuracy.

In such a non-contact 3D measuring device, the projector and the camera are usually driven by a motor to precisely control the direction, and since a separate encoder is provided for driving the motor, the number of components is large and the structure is not only complicated, but also expensive. There is a problem of this expensive. In addition, because of the large number of components and the complicated structure, the equipment becomes larger, so it is only suitable when the scanning object is a bulky machine or a person, and only a very small object such as a tooth model, a ring, or a micromechanical part can be used. There is a problem in that it is difficult to apply in the scanning application. In addition, as the equipment is enlarged, the movement of the driver for operating the device increases and the work is cumbersome.

The present invention is to solve such a problem, the device size is small, can be manufactured compactly, the structure is simple, low production cost, suitable for measuring the three-dimensional shape of a small object, easy to operate It is a technical problem to provide a three-dimensional scanner apparatus.

The three-dimensional scanner device of the present invention for achieving the above technical problem has a housing and a protective cap provided in front of the housing. A light source for generating light for irradiating a scanning object is installed in the housing, and a projection lens for condensing the emitted light is installed in front of the light source in the housing. In the protective cap, a reflecting mirror is provided for changing the path of the light collected by the projection lens in the direction of the scanning object. In addition, the housing is provided with a high magnification lens for collecting light reflected from the scanning object, and an image sensor for converting the light collected by the high magnification lens into an electrical image signal.

In a preferred embodiment, the three-dimensional scanner device can be connected to an external data processing device by a USB cable. The three-dimensional scanner device preferably further comprises a focal length adjusting knob for moving the high magnification lens along its optical axis.

As the high magnification lens, it is preferable to use a lens having a magnification of 5 to 50 times, for example, a kind such as a dermatological microscope lens.

Since the three-dimensional scanner device of the present invention can be manufactured in a compact size and the structure is simple, there is an advantage that low-cost production is possible. Since the device size is small, it is possible to perform the three-dimensional shape measurement of the object in the state of holding the device by hand, the operation is easy, the amount of movement of the operator for the measurement work is reduced, the productivity is increased.

In addition to the small size of the device, a lens is added to the projector and the image sensor respectively to greatly shorten the focal length of the projector and the image sensor, thereby shortening the distance between the projector and the image sensor and the object. The resolution is high, and small objects of 1 to 2 centimeters or less can be easily and accurately scanned.

On the other hand, since the scanning light always detects the light reflection signal incident close to the vertical with respect to the object, there is an additional advantage that a blind spot portion which cannot be scanned is not generated.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings,
1 shows an electrical configuration of a three-dimensional scanner system according to a preferred embodiment of the present invention;
2 is a block diagram of a program executed in the PC shown in FIG. 1;
3 is a side view of a preferred embodiment of the scanner device shown in FIG. 1; And
4 is a view showing the structure of the scanner device shown in FIG.

Referring to FIG. 1, a three-dimensional scanner system according to a preferred embodiment of the present invention includes a PC 10 having a monitor 12 and a scanner device 100 connected to the PC 10.

The PC 10 provides a user with a guide message for operating and calibrating the scanner device 100, controls the operation of the scanner device 100, and analyzes an image signal received from the scanner device 100 to three-dimensionally. A unit image is generated, and a complete three-dimensional image is generated by combining a plurality of three-dimensional unit images. The operation of the PC 10 is performed based on a computer program.

The scanner device 100 includes a projector 110, a first lens 120, a second lens 130, and an image sensor 140. The projector 110 emits light and emits light toward the scanning object 30. In a preferred embodiment, the projector 110 may be an LED projector using an LED as a light source, but is not limited thereto. The first lens 120 collects the light emitted from the projector 110 so that the collected light is irradiated to the scanning object 30. The second lens 130 collects the light reflected and scattered by the scanning object 30. As the second lens 130, a high magnification lens having a sufficient depth while having a magnification of 5 to 50 times depending on the distance between the scanning object 30 and the image sensor 140 is preferably used. The image sensor 140 converts the light collected by the second lens 130 into an electrical image signal. As the image sensor 140, for example, a CCD sensor or a CMOS sensor may be used.

2 is a block diagram of a program executed in the PC 10. The illustrated program includes a 3D unit image obtaining unit 20, a unit image combining unit 22, and a rendering unit 24.

The unit image obtaining unit 20 receives an image signal from the scanner device 100, extracts depth information of each pixel in the image, and generates a 3D unit image based on the extracted depth information. Such three-dimensional unit images may be generated for a plurality of objects, for example, four to seven according to the complexity of the three-dimensional shape of the object.

The unit image combiner 22 combines the plurality of 3D unit images to generate an intact 3D image. In combining the unit images, first, preprocessing is performed to improve distortion, distortion, low contrast, etc. existing in each unit image, convert unit images to be combined into the same coordinates, and then match the similarity with respect to the unit images. After determining the overlapping portion and the connection position by performing a, by performing a smoothing process for the overlapping portion to obtain a seamlessly combined three-dimensional image.

The rendering unit 24 displays each 3D unit image or the completed 3D image on the monitor 12 according to a user's keyboard or mouse operation.

3 is a side view showing a preferred embodiment of the scanner device 100. The illustrated scanner device 100 includes a housing 102 having a substantially cylindrical shape, and a protective cap 104 provided in front of the housing 102. The housing 102 is made of metal or plastic. The protective cap 104 may be processed from acrylic or plastic material of other materials, the front is open.

One side of the housing 102 is provided with a switch 106 for applying a shooting command. On the back or side of the housing 102, a USB connector 108 for connecting to the PC 10 is connected via a cable 109. On the other hand, on one side of the protective cap 104, the focal length adjusting knob 132 is installed in a state in which the protective cap 104 is partially exposed to the outside.

4 shows the structure of the scanner device 100 shown in FIG. The circuit board 150 is installed inside the housing 102 of the scanner device 100 together with the projector 110, the first lens 120, the second lens 130, and the image sensor 140. Meanwhile, a reflector 122 is installed in front of the first lens 120 in the protective cap 104 to change the path of the projector 110 exiting light via the first lens 120. The projector 110, the first lens 120, the reflector 122, the image sensor 140, and the circuit board 150 are fixedly installed, but the second lens 130 is attached to the focal length adjusting knob 132. It is installed so that it can move to the front-back direction.

In a preferred embodiment, the optical path of the optical path refracted by the reflector 122 and the optical path of the reflected light reflected by the scanning object 50 to the image sensor 140 to form an angle of about 70 degrees to 110 degrees The 122, the second lens 130, and the image sensor 140 are disposed. In a particularly preferred embodiment, the angle formed between the refracted light path and the reflected light path is approximately 90 degrees.

Such a scanner device 100 operates as follows. With the scanner device 100 connected to the USB port of the PC 10 and the program is driven, the user performs a calibration operation so that the projector 110, the second lens 130, and the image sensor 140 are optimal. Maintain relative positional relation of. The calibration operation, for example, distorts the image displayed on the monitor 12 of the PC 10 in a state where a loop grid pattern image in which a plurality of circles or other figures are regularly arranged is placed in front of the scanner device 100. This can be done by allowing focal formation without this.

In the state where calibration is completed, the user photographs and images by pressing the switch 106 or manipulating the mouse or keyboard of the PC 10 while the front end of the scanner device 100 is in close contact with or close to the scanning object 50. Allow signal transmission to occur. Then, the photographing and video signal transmission are repeated while changing the direction. In the photographing process, the protective cap 104 protects the image sensor 140 and the like from external force or foreign matter, and also serves as a support for the scanner device 100.

Each time a picture is taken, the unit image acquisition unit 20 of the program executed in the PC 10 receives an image signal from the scanner device 100, extracts depth information of each pixel in the image, and extracts the extracted depth information. Based on the 3D unit image is generated. After the required number of unit images are secured, when the user applies a combining command with a mouse or a keyboard, the unit image combiner 22 of the program combines the plurality of 3D unit images to generate an intact 3D image.

As an experimental example, the projector 110 used an LED type pocket projector MPro120 supplied by 3M Corporation (St. Paul, Minn., USA). As the image sensor 140, the Pro 4000 webcam camera supplied by Logitech was disassembled and only the sensor was separated and used. As a first lens 120, a mobile phone macro lens DINO product supplied by Logitech Co., Ltd. was used. As a second lens 130, a dermatological microscope of unknown origin was obtained, and it was separated and used. Meanwhile, among the program modules executed in the PC 10, the 3D unit image acquisition unit 20 is a UofK 3D scanner program (UofKscannerLT) developed by the Signal and Image Processing Lab of the University of Kentucky, Electrical and Computer Engineering. exe), and David program was used as the unit image combiner 22. In this experimental example, the inventor successfully acquired a perfect three-dimensional image of a small object such as a ring.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Therefore, the embodiments described above are to be understood in all respects as illustrative and not restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

10: PC, 12: Monitor
100: scanner unit
102: housing, 104: protective cap, 106: switch, 108: USB connector
110: projector
120: first lens, 122: reflecting mirror
130: second lens, 132: focal length adjustment knob
140: image sensor
150: circuit board

Claims

housing;
A protective cap provided at the front of the housing;
A light source installed in the housing and generating light for irradiating a scanning object;
A projection lens installed in front of the light source in the housing to collect the emitted light;
A reflector installed in the protective cap and configured to change a path of light collected by the projection lens in a direction of the scanning object;
A high magnification lens installed in the housing and condensing light reflected from the scanning object; And
An image sensor installed in the housing and converting light collected by the high magnification lens into an electrical image signal;
Three-dimensional scanner device having a.

The 3D scanner apparatus according to claim 1, which can be connected to an external data processing apparatus by a USB cable.

The method according to claim 1,
A focal length adjusting knob for moving the high magnification lens along its optical axis;
Three-dimensional scanner device further comprising.

The method according to claim 1,
And a high magnification lens having a magnification of 5 to 50 times.