The invention aims to provide a novel three-dimensional measurement and reconstruction method by providingdigital grating and structure light. The novel three-dimensional measurement and reconstruction method includes the following steps that firstly, a set of sinusoidal stripe grating images with different frequency at different periods is generated, obtained grating images are projected to the surface of the project to be tested through projector and are collected through camera, a phase position is obtained according to novel method of phase unwrapping, and the three-dimensional data of theobject to be tested are obtained and reconstructed in a three-dimensional mode by establishing the relation between camera and projector. According to the novel three-dimensional measurement and reconstruction method by providing the digital grating and the structure light, through a novel phase unwrapping mode, the number of the projected images is optimized, thus the efficiency between image obtaining and data process is improved.

Three-dimensional reconstruction method for determining series of digital grating projection structure light by different frequencies

The invention discloses an object surface micro-scale measurement method based on a pixel grating and computer vision. The method comprises the following steps of: projecting a single-pixel wide-stripe grating pattern by using a projector, and carrying out grating test until a camera can shoot clear stripe pictures; calibrating the camera and the projector; calculating calibration results; carrying out grating projection to obtain a stripe picture; then carrying out image enhancement, denoising, image matting, center line extraction and specific point solving, and calculating space coordinatesof one point on an object by using a space geometry method; and finally, integrating all space coordinates to form an object surface three-dimensional point set, and completing specific surface concave-convex measurement requirements by using the three-dimensional point set. The invention provides a new grating projection image processing and calculating scheme, the research content of grating projection three-dimensional detection is expanded, and the width of each projected stripe can be remarkably reduced by using the single-pixel wide stripes, so that the detection accuracy is greatly improved, and the micro-scale measurement of the surface of the object is realized.

Object surface micro-scale measurement method based on pixel grating and computer vision

The invention relates to a background light elimination method and device, computer equipment and a storage medium. The method comprises the following steps that: under background light, through a projector, projecting multiple sets of phase shift sinusoidal fringes, and obtaining a plurality of deformation fringe patterns; according to the fringe patterns, calculating the fringe sum of each set of phase shift sinusoidal fringes; and according to the fringe sum, calculating the background light component of each deformation fringe pattern; and according to the background light component, processing the plurality of deformation fringe patterns to eliminate the background light components in the plurality of deformation fringe patterns. By use of the method, the background light in the deformation fringe pattern can be quickly and accurately removed.

Background light elimination method and device, computer equipment and storage medium

The invention discloses an unwarping phase error detection and correction method based on the uncertainty of a fringe order. The method defined a new parameter, the uncertainty of the fringe order, used for achieving quick and accurate edge detection on a phase diagram, and thus unwrapping phase error correction is performed. The provided method comprises the main steps of synthesizing different frequency phases in multifrequency phase unwarping, and computing the uncertainty of the fringe order to serve as a medium for detecting the edge of the phase diagram; based on spatial distribution characteristics of the uncertainty of fringe order, marking a phase diagram edge criterion, building a phase diagram edge point-by-point detection scheme accordingly, and thus achieving edge detection ofthe unwarping phase diagram; performing unwarping phase error correction on the detected edge of the phase diagram and an area surrounded by the edge, and thus acquiring correct phase distribution. According to the method disclosed by the invention, detection process and correction process of an unwarping phase error are separated, so that the efficiency of performing error correction on the phase of a discontinuous surface is significantly improved under the premise of ensuring robustness of unwarping phase error correction.

Unwarping phase error detection and correction method based on uncertainty of fringe order

The invention belongs to the field of optical measurement, and discloses an image encoding and decoding method in a surface structured light measurement system. The method comprises the following steps: (a) for a surface structured light measurement system, setting each parameter value of a projector, establishing a relational expression of winding phase shift coordinates and phase shift of each point in an image projected by the projector, and projecting by the projector in combination with the set parameter values and the relational expression so as to realize image encoding and obtain a plurality of phase shift images; (b) shooting the phase shift images by a camera to obtain a plurality of shot images, and establishing a relational expression to calculate and obtain a winding phase shift and a winding phase corresponding to each point in the shot images; and (c) obtaining a pixel coordinate of each point by utilizing the winding phase shift and the winding phase of each point in the shot image so as to realize decoding of the image. According to the invention, the propagation of the phase shift error to the phase inversion error is significantly reduced, and the phase shift decoding precision of the surface structured light measurement system is improved, so that the three-dimensional measurement precision is improved.

Image encoding and decoding method in surface structured light measurement system

The invention discloses a three-dimensional measurement method based on improved multi-frequency stripe structured light. The method is characterized by comprising the following steps of 1, generatingmulti-frequency coded stripe images; 2, conducting camera calibration; 3, conducting projector calibration; 4, projecting the coded stripe images and calculating an absolute phase of a stripe image the frequency of which is fn; 5, conducting three-dimensional reconstruction measurement. According to the method, applied equipment is simple, the cost is low, and precise three-dimensional measurement can be carried out on the surfaces of large objects complex in profile and drastic in transition.

Pan Minling

Papers

Three-dimensional measurement method based on improved multi-frequency stripe structured light