A handheld oral three-dimensional scanning device and control method

Abstract

The invention relates to a handheld oral three-dimensional scanning device which comprises a characteristic pattern projector, two sets of camera lenses of different focal depths and a computer, wherein the characteristic pattern projector is used for projecting characteristic patterns to the surface of a detected object; the camera lenses form different included angles with the projection direction of the characteristic pattern projector respectively, and are used for receiving stripe patterns subjected to diffuse reflection on the surface of the scanned oral objects of different depth-diameter ratios; due to electronic switching, the operation of picking up the reflected light in different depth areas of the same scanned object is completed; the computer realizes space coordinate calculation and multi-view scanning data combination; and the computer is respectively and electrically connected with the characteristic pattern projector and the camera lenses. According to the device disclosed by the invention, the flexibility of hand exercise of an operator and high efficiency of large-size single-view scanning can be combined, the posterior area and anterior area of impression are respectively scanned by two sets of cameras with different focal depths, and the three-dimensional surface data subjected to oral impression are rapidly acquired.

Description

technical field [0001] The invention relates to a three-dimensional oral cavity scanning device, and also relates to a control method of a hand-held three-dimensional oral cavity scanning device. Background technique [0002] The demand for 3D oral cavity scanning is strong. The scanning motion path of the common 3D scanner for dental and jaw models is preset by the manufacturer. There are large morphological differences between the oral cavity models and oral impressions of different individuals. When using this type of device to scan, the scanning The path cannot be personalized, resulting in the scanning path not being able to traverse all the surfaces of the scanned object, or unnecessary repeated scanning of the same surface area, which not only affects the scanning efficiency, but also a large amount of redundant scanning data will increase the difficulty of data fusion and increase the scanning error . [0003] Human hand-eye coordination can achieve more than the de...

AI Technical Summary

Problems solved by technology

Most of the existing industrial hand-held scanners have a fixed focal depth, a single focal depth camera, and a single angle between the projection and receiving optical paths are difficult to meet all the scanning needs of the interior of the oral cavity, models and impressions

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