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Angiography simulation is a critical step in virtual interventional surgery. However, the blood vessels are always complex and irregular, which poses a significant challenge to the accuracy and efficiency of simulation. In this paper, we present a novel method to simulate contrast media propagation, which can efficiently and accurately deal with various complex vascular structures and the coupling...
Tone mapping can compress the color range of HDR (high dynamic range) image to produce its LDR (low dynamic range) image. However, without preserving the original scene detail, tone mapping may produce various artifacts and their fidelity will be severely decreased. In this paper, we propose a new detail-preserving refinement method to efficiently improve the fidelity of tone mapping. Its overall...
In this paper, a real-time facial animation system is presented, that captures live facial expressions and poses from user, and uses them to animate a synthetic 2.5D cartoon character (Avatar) in real-time. Compared to existing 3D Avatar systems, the 2.5D cartoon models are easier to create than full 3D model, and the cartoon-style drawings are more popular among young people. Our system requires...
In this paper, a new contrast media diffusion simulation algorithm is proposed for minimally invasive vascular interventions. On the basis of smoothed particle hydrodynamics (SPH), the algorithm could be mainly divided into two parts: fluid-fluid interaction and fluid-solid interaction. In the fluid-fluid interaction, an adsorption model of iodine particles is built, and the adjacent blood flow particles...
Virtual reality based preoperative planning for Minimally Invasive Vascular Intervention is useful, not only for increasing the success rate of operation, but also used as a training tool for improving doctors' skills. In this paper we present an interactive 3D preoperative planning and training system with haptic device. In this system, we present an intelligent trajectory planning algorithm for...
A virtual reality (VR) based training system for Minimally Invasive Vascular Surgery can be a very useful training tool for improving skills and reducing errors in operation. Computer vision techniques have the potential to be incorporated into a VR based training system for developing low cost, high accuracy and flexible systems in this area. In this paper, we present an interactive 3D training system...
Introducing the similarity discovery algorithm based on time series into virtual throwing action recognition is a new attempt. Four key sub-patterns from the whole throwing action process were defined, and the corresponding sub-patterns discovery algorithms were designed. The similarity matching between the target time series and the template was done to implement the recognition of virtual throwing...
In the last years the increasing programmability of GPU lead to lots of point-based rendering could be implemented on GPU, which not only let CPU to be available for other tasks, but also improve the execution speed through GPU. However, since the recent GPU does not support the epsilon-z-buffering algorithm, a majority of GPU based rendering algorithms are based on multi-pass rendering to achieve...
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