Three-dimensional planta pedis scanning device and method based on single-camera four-step grating phase shift method

A single-camera, three-dimensional scanning technology, applied in the field of biomedicine, can solve the problems of long scanning period, low precision, and human foot scanning, etc., and achieve the effect of improving scanning accuracy and speed, small amount of image data, and fast scanning speed.

CN107970026AActive Publication Date: 2018-05-01XI AN JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2018-05-01

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Abstract

The invention discloses a three-dimensional planta pedis scanning device and a scanning method based on a single-camera four-step grating phase shift method. A sinusoidal grating, a servo motor and agear, which are linked, are arranged on a transverse supporting plate on a side plate of a box body; a laser light source, which is adaptive to the sinusoidal grating, is arranged at the bottom of thebox body; an image reflective mirror surface is arranged in the middle of the box body; a single camera is arranged at the other end of the box body; the sinusoidal grating is irradiated on planta pedis of a human body; a physical grating, under the control of the servo motor, is moved by a certain distance; four distorted gratings that a phase difference is [phi] / 2 are formed on the surface of the planta pedis; by virtue of an industrial camera, four distorted grating images are acquired; and the gratings are subjected to phase analysis, so that three-dimensional data information of the planta pedis is obtained. According to the scanning device and the scanning method provided by the invention, the grating images are acquired by virtue of the high-precision industrial camera, and with the adoption of the four-step phase shift method, random noise can be filtered out and precision can be improved; and the system, which just uses one camera, can reduce system cost and implement high-precision scanning.
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Description

technical field

[0001] The invention belongs to the technical field of biomedicine, and in particular relates to a three-dimensional scanning device and method for soles of feet based on a single-camera four-step grating phase shift method. Background technique

[0002] Foot diseases mainly include high arches, flat feet, pronation, hallux valgus, calluses, plantar fasciitis, etc., as well as valgus and diabetic feet caused by other diseases. Various foot problems will not only produce local symptoms, but also cause poor alignment of the skeletal system above the human foot, resulting in joint problems in knees, hips, pelvis, and spine vertebrae, affecting human health. In view of this situation, it is necessary to obtain the shape of the patient's sole. In clinical practice, the contact method of plantar plaster impression taking is generally used, but this method is not suitable for patients with foot ulceration, gangrene and other foot trauma. The success rate is low, th...

Examples

Embodiment Construction

[0052] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0053] refer to image 3 , a plantar three-dimensional scanning device based on a single-camera four-step grating phase-shift method, comprising a box body 1 with a transparent top, a transverse support plate 7 is arranged in the middle of the box body 1, and a sinusoidal grating 8, servo The motor 3 and the single-axis ball screw linear slide 4, the sinusoidal grating 8 is connected to the control end of the servo motor 3 through the single-axis ball screw linear slide 4, and the bottom of the box 1 and directly in front of the sinusoidal grating 8 is provided with a The laser light source 6 adapted to the sinusoidal grating 8 is provided with an image reflection mirror 5 in front of the sinusoidal grating 8 and the laser light source 6 , and a single camera 2 is also provided on the box 1 .

[0054] Th...