A foot dynamic shape acquisition method

Abstract

The invention discloses a method for acquiring the dynamic shape of a foot shape. This method realizes the three-dimensional shape acquisition of the foot shape at each moment during the movement change process of the human foot. First, wear socks with marking points on the foot shape, and use multiple cameras to track the position of the marking points on the socks at each moment in all directions from multiple perspectives. Then, based on the 3D foot model of the first frame, the binocular camera matching is performed on the visible 2D image marker points tracked in the subsequent frames, and the 3D coordinates are reconstructed to obtain the 3D positions of the visible marker points at each frame time. Finally, starting from the first frame of the 3D foot model, the 3D foot model of the next frame is obtained by iteratively deforming the 3D foot model of the previous frame under the position constraints of the visible marker points at the moment of the next frame. The invention avoids the configuration and clearing of optical marking points in the traditional stereoscopic vision method, and saves the cost brought by the use of optical marking points. At the same time, there is less interaction in the whole process, and the use is convenient and reliable.

Description

technical field [0001] The invention relates to a method for acquiring a dynamic shape of a foot shape, in particular to a method for acquiring the shape of a foot shape during a dynamically changing movement process based on marker points. Background technique [0002] In the technology in the field of three-dimensional measurement of objects, it can be divided into two types: measurement of still objects and measurement of moving objects according to whether the measurement target is moving or not. Classified according to the measurement principle itself, the existing technologies can be mainly divided into measurement technology based on laser scanning, measurement technology based on laser modulation grating, and stereo vision technology. The measurement technology based on laser scanning generally has a long scanning period. At present, the fastest time to scan a foot is more than 4s, which limits that it can only measure static objects and cannot measure moving targets...

AI Technical Summary

Problems solved by technology

The measurement technology based on laser scanning generally has a long scanning period, and the fastest time to scan a foot is more than 4s, which limits it to only measure static objects and cannot measure moving targets. The technology based on laser modulation grating has high requirements on the ambient light of the measurement environment, and generally does not allow changes in the ambient light during the measurement process, which limits the scope of use of this type of technology. In general environments, the measurement of moving targets is difficult. The moving target itself will also change the ambient light, so it is generally used in a dark room

The measurement technology based on stereo vision is mainly used for motion capture. It generally uses optical marking points, which are not sensitive to ambient light, but they are generally sparse and cannot describe the shape of moving targets, and the cost of optical marking points is high. Not conducive to large-scale promotion of the industry

In addition, it is very cumbersome to arrange optical markers on the surface of the target to be captured and to clean up after capture.

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