Intraoral scanning imaging system and imaging method thereof

Abstract

The invention provides an intraoral scanning imaging system and an imaging method thereof. The intraoral scanning imaging system comprises a first imaging assembly, a second imaging assembly and an image processing assembly, wherein the first imaging assembly is used for obtaining an initial three-dimensional image of teeth, and the first imaging assembly comprises a first imaging light source and a receiver arranged corresponding to the first imaging light source; the second imaging assembly is used for acquiring a plurality of polarization three-dimensional images of the teeth, and the second imaging assembly comprises a second imaging light source and a polarization imaging unit arranged corresponding to the second imaging light source; and the image processing assembly is used for receiving the initial three-dimensional image and the multiple polarization three-dimensional images and processing the initial three-dimensional image and the multiple polarization three-dimensional images to obtain a fine three-dimensional image of the teeth. According to the intraoral scanning imaging system, the two sets of imaging assemblies are arranged, the initial three-dimensional image and the polarization three-dimensional images are respectively obtained, the initial three-dimensional image can be corrected through the polarization three-dimensional images, and the imaging precision of the fine three-dimensional image of the teeth is effectively improved.

Description

technical field [0001] The invention relates to an intraoral scanning imaging system and an imaging method thereof, belonging to the field of scanning machinery. Background technique [0002] Intraoral scanner is a commonly used tool for three-dimensional modeling of teeth in the field of oral cavity. Existing intraoral scanners are based on the principle of three-dimensional imaging of visible light to model the three-dimensional surface of teeth. [0003] At present, the mainstream intraoral scanners use structured light imaging (that is, project stripes or other shapes to the teeth in the mouth), and then use cameras or other image acquisition structures to collect changes in stripes (or other shapes) to invert the three-dimensional model of the teeth. The imaging of existing intraoral scanners is affected by the structure of structured light imaging, so that the accuracy of existing intraoral scanners is controlled within 10-30 microns. [0004] In fact, in addition to...

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Problems solved by technology

[0003] At present, the mainstream intraoral scanners use structured light imaging (that is, project stripes or other shapes to the teeth in the mouth), and then use cameras or other image acquisition structures to collect changes in stripes (or other shapes) to invert the three-dimensional model of the teeth. The imaging of existing intraoral scanners is affected by the structure of structured light imaging, so that the accuracy of existing intraoral scanners is controlled within 10-30 microns

[0004] In fact, in addition to the method of using projected fringes and collecting fringe deformation, the existing intraoral scanning imaging also has binocular imaging and photon time-of-flight methods that can perform optical three-dimensional modeling; however, due to the lack of characteristic structures on teeth, and The space in the oral cavity is limited, therefore, it will affect the components of the imaging triangle during binocular imaging, making it difficult to obtain 3D modeling of teeth using binocular imaging

[0005] However, when the photon time-of-flight method is used for three-dimensional modeling of teeth, it is affected by the low imaging accuracy of the photon time-of-flight method itself, so it cannot meet the imaging accuracy requirements of 10-30 microns

[0006] At the same time, whether it is based on structured light imaging, binocular imaging or photon time-of-flight method, the use of optical three-dimensional imaging to image intraoral teeth has the following defects: 1. It is easily affected by reflected light, that is, if there is 2. Binocular imaging is not applicable due to the lack of teeth features; and the structured light imaging method and the photon time-of-flight method cannot make full use of the single pixel information of the camera, and both require multiple pixel combinations image analysis together, therefore, the information utilization rate is low and the overall 3D imaging speed is slow

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