A novel multi-view connection method is proposed for whole field three-dimensional (3D) profile measurement. Firstly 3D profiles of tested object from different views can be measured by using the digital fringe projection profilometry, and then these profiles are transformed into the common coordinate by applying transform matrix. With the help of a new determination method for the revolution axis of rotary stage, the direction vector and one point of the axis are achieved. To improve the computability and feasibility of coordinate transformation, the quaternion method is also used to get the transform matrix. Considering the error movements between the views, an effective method based on multi-aperture overlap scanning technique (MAOST) is presented, which can determine the relationship between two adjacent views from their overlapping areas. The connection of adjacent views is performed accurately in 3D space. Both computer simulation and experimental results are presented to verify the feasibility of proposed method.
Based on coupling theory, this paper analyzes mainland Chinese tourists who had purchased Taiwanese products before they traveled to Taiwan, and presents three key findings: (1) The evaluation value of mainland Chinese tourists for tourism destination image (TDI) is higher than that of product country image (PCI). (2) The degrees of coupling coordination between TDI and PCI as well as cognitive TDI and cognitive PCI are barely balanced; the degree of coupling coordination between affective TDI and affective PCI is slightly unbalanced. (3) There are stable and fluctuating coupling coordination relationships between TDI and PCI in different social demographic groups.
A novel multiaperture connection method for three-dimensional shape measurement is presented. The principle of multiaperture method is to obtain subapertures relative location and orientation by measuring the object from different subapertures, and afterwards connecting them together. Rrotation and transformation of subapertures are the key problems to realize multiaperture connection. In order to improve calculability and efficiency of the connection algorithm, a new connection method using quaternion is proposed. The mathematic model of multiaperture connection associated with our proposed method is discussed, and the experimental measurement on the basis of digital grating projection system is carried out to demonstrate the validity of this suggested method. Compared with the conventional connection method, this method offers with such advantages as computational simplicity, high efficiency and reasonable accuracy.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.