CN210321610U

CN210321610U - Three-dimensional scanning system in single camera mouth

Info

Publication number: CN210321610U
Application number: CN201921644250.3U
Authority: CN
Inventors: 龙潜; 欧攀; 赵力; 谢启伟; 赵梓成
Original assignee: Yunnan Astronomical Observatory of CAS
Current assignee: Yunnan Astronomical Observatory of CAS
Priority date: 2019-09-29
Filing date: 2019-09-29
Publication date: 2020-04-14
Anticipated expiration: 2029-09-29

Abstract

A single-camera intraoral three-dimensional scanning system comprises a single camera, wherein two reflectors M2 and M3 which are perpendicular to each other are arranged between the single camera and a measured object, an angular bisector of the two reflectors is perpendicular to a lens of the single camera, mirror surfaces of the two reflectors face the lens, a reflector M1 is arranged on the left side of a reflector M2, and a reflector M4 is arranged on the right side of the reflector M3; the four mirrors M1, M2, M3 and M4 are in the same plane. The utility model discloses a single camera combines other optical splitting devices, obtains the effect of two mesh stereovision three-dimensional scanning.

Description

Three-dimensional scanning system in single camera mouth

Technical Field

The utility model belongs to oral medical instrument field, concretely relates to three-dimensional scanning system in single camera mouth.

Background

With the rapid development of the three-dimensional measurement technology, the technology has important application in various industries. In the process of digitizing an oral impression, three-dimensional information of the measurement object is generally obtained by computer vision techniques. Therefore, the measured scene needs to be measured in multiple views to obtain more complete measurement data, or directly measured in two eyes to obtain three-dimensional information.

The binocular stereo vision integrates images obtained by two eyes and observes the difference between the images, so that people can obtain obvious depth feeling, the corresponding relation between features is established, mapping points of the same space physical point in different images are corresponded, and the difference is called as a parallax (Disparity) image.

The binocular stereo vision measuring method has the advantages of high efficiency, proper precision, relatively simple system structure, low cost and the like, and is suitable for online and non-contact product detection and quality control. In the measurement of moving objects, including animal and human bodies, the stereoscopic method is a more efficient measurement method because the image acquisition is done instantaneously. The binocular stereo vision system is one of key technologies of computer vision, and obtaining distance information of a spatial three-dimensional scene is also an important content in computer vision research.

However, the volume of the device used for binocular stereo vision measurement is large, the application in many scenes is limited, especially when the device is used in a narrow space such as the oral cavity, the defects are more obvious, and a single camera cannot obtain complete three-dimensional data generally due to the limitation of measurement equipment and measurement conditions.

Disclosure of Invention

The utility model aims at providing a three-dimensional scanning system in single camera mouth combines other optics beam splitting devices through single camera, obtains the effect of two mesh stereovision three-dimensional scanning.

The utility model adopts the technical proposal that:

a single-camera intraoral three-dimensional scanning system comprises a single camera, wherein two reflectors M2 and M3 which are perpendicular to each other are arranged between the single camera and a measured object, an angular bisector of the two reflectors is perpendicular to a lens of the single camera, mirror surfaces of the two reflectors face the lens, a reflector M1 is arranged on the left side of a reflector M2, and a reflector M4 is arranged on the right side of the reflector M3; the four mirrors M1, M2, M3 and M4 are in the same plane.

Further, the four reflectors M1, M2, M3 and M4 are square shapes of 2-5 mm.

Further, the distance from the lens to the intersection of the mirrors M2 and M3 was 1 mm.

Furthermore, the distances between the reflectors M1 and M2 and between the reflectors M4 and M3 are all 3-5 mm.

Furthermore, the included angles between the reflectors M1 and M4 and the angle bisector are 25-40 degrees respectively.

The utility model has the advantages that:

limited by the volume of the intraoral three-dimensional scanning, a single camera is combined with an additional optical beam splitting device (a plane mirror group) to obtain the binocular stereoscopic three-dimensional scanning effect, and by means of the beam splitting devices, the surface image of the object to be detected can simultaneously reach the left target surface and the right target surface of the camera through the left light path and the right light path. By analyzing these sub-images, three-dimensional point cloud data of the object surface can be obtained.

Drawings

Fig. 1 is a schematic diagram of an optical path of a single-camera intraoral three-dimensional scanning system.

Detailed Description

As shown in fig. 1, a single-camera intraoral three-dimensional scanning system includes a single camera, two reflectors M2, M3 perpendicular to each other are provided between the single camera and a measured object P, an angular bisector of the two reflectors is perpendicular to a lens L of the single camera, mirror surfaces of the two reflectors face the lens L, a reflector M1 is provided on a left side of the reflector M2, and a reflector M4 is provided on a right side of the reflector M3; the four mirrors M1, M2, M3 and M4 are in the same plane.

The four mirrors M1, M2, M3 and M4 are 5mm square; the distance from the lens to the intersection point of the reflectors M2 and M3 is 1 mm; the distances between the reflectors M1 and M2 and between the reflectors M4 and M3 are all 3 mm; the angle between the reflecting mirrors M1 and M4 and the angle bisector is 30 degrees respectively.

Claims

1. The utility model provides a three-dimensional scanning system in single camera mouth which characterized in that: the device comprises a single camera, two reflectors M2 and M3 which are perpendicular to each other are arranged between the single camera and a measured object, an angular bisector of the two reflectors is perpendicular to a lens of the single camera, mirror surfaces of the two reflectors face the lens, a reflector M1 is arranged on the left side of a reflector M2, and a reflector M4 is arranged on the right side of a reflector M3; the four mirrors M1, M2, M3 and M4 are in the same plane.

2. A single-camera intraoral three-dimensional scanning system according to claim 1, wherein: the four reflectors M1, M2, M3 and M4 are square shapes of 2-5 mm.

3. A single-camera intraoral three-dimensional scanning system according to claim 1, wherein: the distance from the lens to the intersection of mirrors M2 and M3 was 1 mm.

4. A single-camera intraoral three-dimensional scanning system according to claim 1, wherein: the distances between the reflectors M1 and M2 and between the reflectors M4 and M3 are all 3-5 mm.

5. A single-camera intraoral three-dimensional scanning system according to claim 1, wherein: the included angles between the reflectors M1 and M4 and the angle bisector are 25-40 degrees respectively.