Hang Qiu

Segmentation of Tubular Structures Using Flux Maximizing Flows: An Application to Color Medical Images

The segmentation of vasculature is of utmost importance in medical image processing. It is arduous to represent the tubular structures of images obtained by recent imaging modalities with direct visualization. In this paper, we present a method of vessel segmentation in color volumetric medical images. Differ from using intensity images as data set, the improvement of traditional flux maximizing flows produce effective segmentations in color images. The visualization of vessel segmentation can illuminate the spatial structures of vasculature, making our techniques feasible for clinical diagnosis and many other applications.

Real-Time Virtual Military Simulation System

Virtual reality and computer simulation are two popular techniques in the field of todays computer applications. They are widely used in building virtual battlefield environment, reconstructing the real environment of the researched region, and foreseeing the combat situation. In this paper, a real-time virtual military simulation system is presented. We explore the general architecture of this simulation system and some related key techniques. Practical usage shows that this system not only supports extendable software architecture but also can provide high efficient scene rendering methods which can be used in real-time visualization of battlefield.

An Object-Oriented Graphics Engine

Creating a 3D graphics rendering engine is not a trivial task as users often demand for high quality output and performance. With the development of computer graphics hardware, graphics engine is a research focus. In this paper, an object-oriented 3D graphics engine-Gingko is presented and implemented. We discussed the general architecture of this engine and the relationships of every module. Not only does this engine support extendable software architecture, but also it provides high efficient scene rendering method and convenient application programming interfaces. Experimental results show that this engine has high stability and high rendering speed.

Detail-Enhanced Multimodal Medical Image Fusion

Many traditional medical image fusion methods cannot well preserve details of source images in the fused image. Aiming at handling this issue, a novel medical image fusion scheme based on gain control is developed by nonsubsampled contour let transform (NSCT). To enhance image details, the proposed method applies power law transformation to tune coefficients of each decomposed sub band, and adjusts the strength of the sub band signals by smooth gain control. Finally, the fused image with more details is constructed by the inverse NSCT. Experimental results demonstrate that our method can produce better fusion performance than some existing methods by the comparison of visual perception and objective quality assessment.

3D Visualization of the Radar Environment

In this paper, a new method for 3D visualization of radar electromagnetic environment is presented. This method is based on derivation of the radar equation, from the perspectives of pitch and azimuth angles to achieve 3D modeling of radar coverage through discrete subdivision, and the radar model possesses self-adaptability to different levels of detail. Our method ensures that the model shape conforms to the radar’s attributes. Compared to conventional methods, the experiments show that our method has better efficiency, adaptability, and accuracy in accomplishing the radar 3D modeling and rendering.

Rendering System for Large-Scale Grass

Grass is one of the nature elements that is difficult to render in real-time due to its geometric complexity and the large coverage area. Realistic simulation of grass is one of the challenging topics in computer graphics. In this paper, a rendering system for large-scale grass is presented and implemented. Not only does this system provide high efficient scene rendering method for grass, but also it supports extendable architecture. We discussed the general architecture of this system and the key techniques for modeling and rendering of large-scale grass. Experimental results show that this system can produce realistic grass and has interactive frame rate. Keywordsgrass;natural scene; real-time rendering

Network Management Framework Based on Active Network Technique

The Active Networks approach has been presented as an alternative technology for solving several problems in conventional networks, mainly in the network management area. In this paper, we present an Active Network-based network management framework which shows the advantages of network programmability. It is designed to actively manage both traditional and active networks, and be incrementally deployed in existing networks. We explain the design and implementation of active node, discuss the Code Distribution Scheme which is based on mobile code, demand loading, and caching techniques. We also explore the general management scheme of this framework.