Measurement method and equipment of digitized measurement system of human face three-dimensional surface shape

Abstract

The invention discloses a human face three-dimensional shape digital measuring system and a method thereof. The method is based on a composite structure light projection technology. Composite structure light striation consists of a plurality of carrier frequencies of different frequencies which are modulated respectively to be piled with a plurality of frames of sine striations with phase difference at the direction vertical to the carrier frequencies; only one frame of human face modulated composite structure light striation raster image is required to be collected, and a plurality of frames of simple sine striations with phase shift can be taken out from one frame of composite striation by two-dimensional Fourier transformation, frequency domain two-dimensional bandpass filtering and inverse Fourier transformation; then a target human face three-dimensional shape is rebuilt by the traditional phase shifting technology in the phase measuring figure technology. The method can conveniently obtain the exact digital three-dimensional figure of human face, provides the novel measuring method and evaluating measure for human face plastic surgery and promotes the digital development of medical cosmetology.

Description

technical field [0001] The invention belongs to the fields of information optics and image processing, and relates to a three-dimensional human face digital measurement system and method based on composite structured light projection technology. Background technique [0002] With the progress of society and the improvement of living standards, people put forward higher requirements for the quality of life, especially the pursuit of beauty is becoming more and more obvious. Plastic surgery is an emerging industry that is emerging in the world market. The average annual plastic surgery consumption in the United States is 40 billion US dollars, and the proportion of plastic surgery in Japan and South Korea is about twice that of China. With the formation of the overall health concept, the development of Chinese medical cosmetology will increase rapidly. At present, the total number of target consumer groups for plastic surgery nationwide is estimated to be 139.7 million, accou...

AI Technical Summary

Problems solved by technology

However, to demodulate a piece of 3D contour data by phase measurement profilometry, at least three phase shift fringes need to be photographed, which affects the real-time performance of the measurement, and the slight movement or expression change of the target face during the measurement process will directly affect the demodulation result , resulting in a large reconstruction error

⑧, ⑨ proposed a fast phase shift technology using digital grating projection, although several phase shift fringes can be projected and photographed in a short time, but when the phase shift fringes are projected / photographed in fast rotation, the images captured by the CCD camera are very small. It is easy to produce tailing, distortion and other phenomena, so it is easy to cause large measurement errors

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