Facial shake compensation method for three-dimensional face measurement

Abstract

The invention discloses a facial shake compensation method for three-dimensional face measurement. The method includes the following steps that: a three-step phase shift method is used to project a three-step phase-shifted grating image to a measured object, the projected three-step phase-shifted grating image is shot through a camera, the initial value of a phase shift amount caused by shake canbe solved on the basis of a relationship between the three-step phase-shifted grating images; an additional uniform brightness image is projected to the measured object and is shot so as to be adoptedas reference background light intensity; and the initial phase shift amount is optimized, the ideal phase shift amount can accurately reflect ripple error caused by face shake, and the ideal phase shift amount is substituted into the phase solution formula of the three-step phase shift method, so that compensated face phase information can be obtained, and an accurate three-dimensional face reconstruction result can be obtained through phase and depth conversion. The method of the invention has a motion error compensation function and can compensate measurement error caused by the face shakein a three-dimensional face recognition process, and can accurately measure the three-dimensional contour of a shake object under a condition of using a low-cost measurement system.

Description

Technical field [0001] The invention belongs to the technical field of optical measurement, and particularly relates to a facial shake compensation method for three-dimensional face measurement. Background technique [0002] With the rapid development of computer technology and bioengineering technology in recent decades, the use of the uniqueness of human biological characteristics to identify each individual's identity has been universally recognized by the international community. Compared with other biological characteristics, the face recognition method has the advantages of non-contact, complete information, convenient collection, and human-machine friendly. It has become one of the most ideal technical approaches in identity verification and identity recognition applications. For human beings, face recognition is our innate ability, and each specific face recognition is also a subconscious and natural process. However, the internal mechanism of face recognition is very co...

AI Technical Summary

Problems solved by technology

However, for face scanning, it is difficult to avoid problems such as unconscious shaking of the face and slight shaking of the head during the data collection process.

The overall displacement or movement of the face caused by shaking or shaking will seriously affect the accuracy of the reconstructed 3D face data

Although, by increasing the projection speed (document "Pulse-width modulation infocused three-dimensional fringe projection", author Gastón A. Ayubi et al.) or reducing the number of projection patterns (document "Dual-frequency pattern scheme for high-speed 3-D shapemeasurement ", the author K.Liu etc.) can increase the measurement speed and indirectly reduce the influence of jitter on the measurement, but they still cannot completely solve this problem, especially for low-cost three-dimensional measurement systems, the pattern projection device used High-speed projection and shooting of coded patterns cannot be realized with the acquisition device

Therefore, for 3D face contour measurement, there is still a lack of a facial shake compensation technology that does not rely on improving the measurement speed of the system

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