Method and device for three-dimensionally reestablishing surface contour of human body

Abstract

The invention discloses a method for three-dimensionally reestablishing a surface contour of a human body, and the method is characterized by comprising the following steps: (1) the projection region of a protector, the shooting region of a camera and the measured part of the human body are corresponding; (2) the projector projects one image once, the camera collects one image, and the projected image comprises black and white images, Gray code images and phase shift grating images; and (3) the collected pictures are processed to obtain the three-dimensional information of the surface contour of the human body. In the invention, a phase error compensation curve is designed and the reestablishment accuracy of the surface contour of the human body is enhanced according to the characteristics of the projector and the time characteristics in the projecting and shooting courses; a common period calibration method is improved and used for calibrating the absolute phase of the surface contour of the human body, thereby enhancing the reestablishment accuracy of the surface contour of the human body; and an independent projected image generating module is adopted and used for generating the projected images and controlling the projected images of the projector, thereby facilitating the control on the time interval between the projected images of the projector and the collected images of the camera and enhancing the stability of phase error fitted functions.

Description

technical field [0001] The present invention relates to the field of optical measurement technology and the field of computer image processing, and further relates to a method and device for three-dimensional reconstruction of human body surface contour based on structured light. Background technique [0002] Human body surface contour measurement can use impression method, CT imaging method, laser scanning method, structured light method and other methods. The method of taking an impression is relatively simple, but the accuracy of the three-dimensional reconstruction is often poor due to the compression deformation of the material and soft tissue, which takes a long time and may cause discomfort to the human body. Hospitals generally obtain complete three-dimensional information of a certain part of the human body through computerized tomography (CT) technology. However, the cost of CT is too high and it has radiation, so it is difficult to promote its use on a large scal...

AI Technical Summary

Problems solved by technology

The Gray code is simple to encode, has strong anti-interference ability, and is not limited by the height of the object. However, as the number of encoding patterns increases, the speed will decrease and the difficulty of decoding will increase. Therefore, the resolution of the Gray code is limited.

The phase shift method is suitable for measuring objects with continuous surfaces in a small range, and has high resolution, but the phase is obtained by arctangent calculation, which is limited to (-π / 2,π / 2], and the process of unfolding the folded phase is error-prone

Moreover, when the structured light technology is used to measure the contour of the human body surface, the requirements for the measurement environment are relatively high, and the light in the environment will bring large errors to the measurement results.

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