Quick three-dimensional human head measurement method based on digital speckle correlation

Abstract

The invention discloses a quick three-dimensional human head measurement method based on digital speckle correlation. The method comprises the steps: enabling a human head model to be sleeved with a silk head sleeve with speckles, and enabling two cameras to be placed oppositely and vertically, so as to obtain a human head model two-dimensional image with speckles; marking a speckle area to be measured in the image, setting the central point of the speckle area as a seed point, and obtaining the initial estimated displacement of the seed point through SIFT and RANSAC; head parallax data between two camera visual angles can be obtained by using a digital image correlation algorithm (DIC), and the parallax data is converted into three-dimensional information by using calibration parameters of the cameras. According to the invention, single-frame and high-precision three-dimensional human head measurement can be realized.

Description

technical field [0001] The invention belongs to the technical field of optical measurement, in particular to a fast three-dimensional head measurement method based on digital speckle correlation. Background technique [0002] In recent decades, 3D contour measurement technology has been widely used in various fields, such as online industrial inspection, reverse modeling and 3D face measurement. Among the many three-dimensional profile measurement methods, the digital image correlation technology based on speckle correlation and triangulation principles is one of the most efficient and practical technologies, because it has the advantages of non-contact, full-field, high precision and high efficiency. However, in the digital image correlation technology, the digital speckle correlation algorithm will directly affect the measurement accuracy and measurement efficiency of the digital image correlation. At present, there is still a lack of a three-dimensional measurement metho...

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