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Machine learning techniques, namely convolutional neural networks (CNN) and regression forests, have recently shown great promise in performing 6-DoF localization of monocular images. However, in most cases image-sequences, rather only single images, are readily available. To this extent, none of the proposed learning-based approaches exploit the valuable constraint of temporal smoothness, often leading...
This paper studies monocular visual odometry (VO) problem. Most of existing VO algorithms are developed under a standard pipeline including feature extraction, feature matching, motion estimation, local optimisation, etc. Although some of them have demonstrated superior performance, they usually need to be carefully designed and specifically fine-tuned to work well in different environments. Some...
Digital image processing is widely used in the crack detection and location. In order to guide staff maintenance equipment more effectively and timely, the image detection system based on crack which has been put forward. On the basis of LabVIEW platform, Crack image in this system is acquired that using two industrial cameras, and then used the SIFT feature matching, RANSAC and image fusion to stitch...
This paper presents a novel unscented Kalman filter based algorithm for vision-aided inertial navigation system (VINS). It uses dynamic model of inertial measurement unit (IMU) to perform state propagation and trifocal tensor based geometric constraints of three views to update system. Unlike the conventional methods, the positions of feature points are neither required to be augmented into system...
Recognising and understanding the activities performed by people is a fundamental research topic in developing a wi de range of applications that would be societally beneficial. In this article, we present and discuss two research projects on human action recognition based on computer vision techniques. We also report an ongoing research project that focuses on learning human activities through low...
We present a high-accuracy shape acquisition approach that uses a combined Gray code and phase-shifting structured light projection. The Gray code pattern coarsely divides the projected plane into local regions, whereas phase-shifting precisely determines the pixel-accurate index for each point on the plane. The combination of the two codifications greatly decreases the number of patterns as compared...
To reconstruct image down-sampled by color filter array on sensor of digital camera, demosaicking, a process of estimating missing color values is required. An improved edge adaptive color demosaicking method is presented. Edges are detected by an improved edge indicator, and missing color values are estimated in chosen direction. In estimation stage, weighted average of Taylor series is adopted....
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