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

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.

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...

AI Technical Summary

Problems solved by technology

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, the collection and processing process is complex, the process is cumbersome, and the model reuse rate is poor

There are very few non-contact 3D scanning products on the market, and all of them are imported from abroad, which are expensive, affect the examination of some patients, affect the development of the disease, and delay treatment

[0003] Although the three-dimensional scanning devices disclosed in CN201410708967, CN104374332A, CN104339658A, CN104315979A, and CN104359405A can realize the three-dimensional scanning function, the scanning mode, precision and mechanical structure of the scanning device are not suitable for scanning human feet, and the scanning cycle of the above products They are all very long. Due to the special scanning parts and the need to be still during scanning, this has high requirements for the length of scanning time and the height of the scanning device. However, the above-mentioned several products do not meet the requirements for human foot scanning. , the effect is unsatisfactory; in terms of methods, the grating measurement profilometry method disclosed in CN102519393A and CN106412561A can measure the height information of the object, but this method requires two gratings to image at the same time, the light source is too high, and the acquisition image The position of the CCD camera and the grating are in the same direction, which is not suitable for collecting the soles of the feet. The methods of the three-dimensional surface measuring instruments disclosed in CN2048682U, CN201611133750.1, and CN106643563A have relatively low precision and cannot meet the needs of foot orthopedics and rehabilitation. requirements

Images