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In this paper we focus on what meaningful 2D perceptual information we can get from 3D LiDAR point cloud. Current work [1] [2] [3] have demonstrated that the depth, height and local surface normal value of a 3D data are useful features for improving Deep Neural Networks (DNNs) based object detection. We thus propose to organise LiDAR point as three different maps: dense depth map, height map and surface...
Graph-based Simultaneous Localization and Mapping (SLAM) refers to formulate SLAM by a graph model whose nodes represent poses of the robot and whose edges represent constraints relating the poses, then solve an error minimization problem to find the configuration of the poses that best fits with the constraints. One problem of state-of-the-art SLAM algorithms is that they rely on all the poses and...
This paper proposes a novel algorithm for up-sampling 2D sparse depth map projected by laser scanner (i.e. Velodyne HDL-64E) using its synchronised RGB image and Anisotropic Diffusion Tensor. We assume each depth-unknown pixel's depth value derives from all depth-known pixels and their affinity can be measured in a geodesic manner. Specifically, for each depth-unknown point, we compute its geodesic...
A novel reconfigurable bandpass filter using varactor-tuned stepped impedance resonator (SIR) is introduced to achieve tunable central frequency and bandwidth. The varactor-tuned stepped impedance resonator structure consists of a stepped impedance with open or short-circuited stub and a varactor between the stubs. It's convenient to change the transmission zeros with the appropriate DC voltage controlling...
Nowadays, it becomes more and more important to miniaturize bandpass filters(BPFs) in RF front-ends because of size requirement of communication systems. As to achieve multifunction of RF front-end, BPFs with tunable passband, on the other hand, is another popular direction of BPF design. In this paper, a new three-order chebyshev BPF using asymmetry coupled lines and varactors, whose passband is...
Traditional educational systems are usually presented in a course based and static way, without taking into account the learner's interests and learning progress. Language learning by that means could be accompanied by boredom and lack of real experiences, which is a great barrier to improving language skills. This paper presents an English learning system that is based on Web browsing. Users browse...
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