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While the RGB2GRAY conversion with fixed parameters is a classical and widely used tool for image decolorization, recent studies showed that adapting weighting parameters in a two-order multivariance polynomial model has great potential to improve the conversion ability. In this paper, by viewing the two-order model as the sum of three subspaces, it is observed that the first subspace in the two-order...
What operation instruments interact with are human tissues and organs in virtual surgery. Because its impedance is nonlinear and unpredictable, the haptic interaction is difficult to be stable, especially when interacting with rigid tissues such as bone. To solve this difficult problem, this paper presents a sliding mode control algorithm based on Lyapunov theory to realize stable operation for virtual...
As one of the pivot techniques in enhanced reality the fusion of virtual and real scene image often happens in two ways, either to incorporate a real object into a virtual environment, or to incorporate a virtual object into a real scene. Most of the conventional methods for the fusion are conducted at the image level, which fails to handle three-dimensional objects. In this paper, a novel depth-dependent...
Accuracy is only a quality characteristic of modeling & simulation application (MSA), and the characteristics such as reliability, maintainability, usability and safety should be considered. VV&A must be expanded from accuracy-centered assessment to quality-centered assessment. Reliability is an important metrics of product quality, and can be introduced to simulation domain. Firstly, an introduction...
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