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2011 4th IEEE International Conference on Computer Science and Information technology(ICCSIT 2011)

作者： Zhen Huang Aiming Hao State Key Lab of Virtual Reality Technology & Systems

This paper concerned on how to solve the seam problem between patches of irregular textures in traditional rendering model. First we transformed the neighboring pixels along the seams into a uniform coordinate system through the approach of Bresenham line scan method. Then we applied a constrained texture synthesis method to eliminate the seam in their transformed local neighboring areas. The result of the experiments showed that the algorithm we propose could reserve the textures’ local distributing features and is capable of eliminating the seams between patches of irregular textures. We concluded that this algorithm has the potential to be commonly used to solve the seam problems of the assets in virtual reality, computer animation and video games.

关键词： irregular texture seamless texture texture synthesis texture tile

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Spring-based measurement equipment for evaluation of 3-DOF haptic rendering algorithms

HAVE 2011 - IEEE International Symposium on Haptic Audio-Vis...

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HAVE 2011 - IEEE International Symposium on Haptic Audio-Visual Environments and Games, Proceedings 2011年 29-34页

作者： Wang, Zhixiang Wang, Dangxiao Song, Tao State Key Lab. of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9781457704987

Evaluation of haptic rendering algorithms is an important topic to achieve realistic haptic simulation. In this paper, we developed a spring-based measurement equipment to enable quantified evaluation for 3-DOF (Degree of Freedom) haptic rendering of contact between a point-shaped tool and a complex-shaped object. We proposed a new method to formulate the trajectory of the haptic tool, which will be the input signal for the target haptic rendering algorithm. Using three springs between human's hand and the probe's tip, we can precisely mimic the limited Z-Width characteristic of current haptic devices. Furthermore, we introduced a spatial registration algorithm to establish the transformation from the local frame of the force sensor to the normal of contact point, thus maintain the computed normal force is always along the normal direction. Preliminary contact experiment against a planar surface is carried out to validate the performance of our method. Experiment results showed our method can capture the real-time force and motion signal during contact, and can be utilized to evaluate performance of various haptic rendering algorithms. © 2011 IEEE.

关键词： Degrees of freedom (mechanics)

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A skin-integrated device for neck posture monitoring and correction

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Microsystems & Nanoengineering 2023年第6期9卷 221-234页

作者： Hu Luo Tianhao Jin Yu Zhang Bohao Tian Yuru Zhang Dangxiao Wang State Key Lab of Virtual Reality Technology and Systems and Bejing Advanced Innovation Center for Biomedical Engineering Beihang UniversityNo.37 Xueyuan RoadHaidian District100191 BejingChina School of General Engineering Beihang UniversityNo.37 Xueyuan RoadHaidian DistrictBejingChina Peng Cheng Laboratory Shenzhen 518055China

Cervical spondylosis is a common disease that is often caused by long-term abnormal cervical curvature due to activities such as reading books and using computers or *** paper explores building an untethered and skin-integrated device in an e-skin form factor to monitor and haptically correct neck *** proposed design features a multilayered structure that integrates all flexible electronic circuits and components into a compact skin space while being untethered and skin *** accelerometer in the e-skin attaches to the neck for posture sensing,while four vibration actuators closely touch the neck skin to provide localized vibrotactile stimuli that encode four-direction correction cues of neck flexion±αand lateral bending±β.To ensure the reliability of posture sensing and vibrotactile rendering during neck movement,it is necessary to prevent the e-skin device from shifting ***,a hollow structure-based method is implemented for stably attaching the e-skin to the neck *** validated the e-skin device's sensing precision,skin-conformal compliance,stickiness,stability and effectiveness during the motion of neck postures,including its discrimination of localized four-direction vibrotactile cues.A user study verified the device's performance for sensing and correcting different abnormal neck postures during activities such as using smartphones,reading books,and processing computer *** proposed e-skin device may create opportunities for more convenient cervical spondylosis prevention and rehabilitation.

关键词： correction rendering shifting

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A novel fusion method of infrared and visible images based on non-subsampled contourlet transform 8th

A novel fusion method of infrared and visible images based o...

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8th International Conference on Image and Graphics, ICIG 2015

作者： Lu, Fei Lei, Xiaoyong State Key Lab. of Virtual Reality Technology and Systems Beihang University Beijing100191 China School of Automation Science and Electrical Engineering Beihang University Beijing100191 China

ISBN: (纸本)9783319219776

This paper presents a novel infrared (IR) and visible images fusion methodology based on non-subsampled contourlet transform (NSCT). NSCT shows better performance compared with usual multi-scale decomposition for its multi-scale, shift invariance, multi-direction and efficient capture of geometric structures. The proposed fusion method uses NSCT for multiresolution decomposition of the source images. The low-pass NSCT adaptive fusion weights calculated from the IR source image’s pixel statistical characteristics. The high frequency directional coefficients with max absolute value are the coefficients of the fusion NSCT high frequency. Experimental results conforms that the proposed method have better performance compared with DWT, compressed sensing based on DWT (CS-DWT), NSCT, NSCT based on spatial frequency motivated pulse coupled neural networks (SF-PCNN-NSCT) from visual effects and a list of fusion quality evaluation metrics. © Springer International Publishing Switzerland 2015.

关键词： Image fusion

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Motion Transition Based on Bézier Quaternion Curve

Motion Transition Based on Bézier Quaternion Curve

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2017中国智能自动化会议(CIAC 2017)

作者： Yancai Lu Shuling Dai State Key Lab Virtual Reality Technology and Systems Beihang University

1 Introduction virtual human is a digital representation of the geometric and behavioral property of human beings in the virtual environment generated by computer [1].It is demanded by numerous applications ranging from military simulation,education,aerospace and movie special effects,to human factors analysis,*** the development of motion capture technology,data-driven [2] virtual human motion

关键词： frame zier Quaternion Curve Motion Transition Based on B

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A STRONG BILAYER APPEARANCE MODEL FOR HUMAN POSE ESTIMATION FROM A HIGH FREEDOM STILL IMAGE

A STRONG BILAYER APPEARANCE MODEL FOR HUMAN POSE ESTIMATION ...

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IEEE International Conference on Image Processing

作者： Chengyu Guo Songsong Ruan Xiaohui Liang State Key Lab. of Virtual Reality Technology and Systems Beihang University

ISBN: (纸本)9781467399623

Appearance model is widely used for image description and demonstrates an impressive performance in object detection. However, most appearance models can not be applied to more freedom object in still image, especially when dealt with variant objects whose shapes are modified by warping, rotation, etc. In this article, a simple but effective method to build a regional rotation-invariant feature descriptor is proposed to catch discriminative information of the variant human pose, which has a superior advantage when targets are in arbitrary orientations and slightly warping. Moreover, a mixture spatial model with visible parameters is then presented to differentiate the body structure and estimate the visible accurate position of each joint. The experiment results indicate that the proposed descriptor give near state-of-the-art performance on both handwritten digit recognition database and two public human motion databases containing athletes or pedestrians under certain different variations.

关键词： Human detection Pose estimation Bilayer appearance model Spatial prior distribution pose estimation Body Freedom STILL Posing image description Human Still images Object detection images Warping Pedestrians Descriptors

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Efficient Metaballs-Based Collision Detection for VR Neurosurgery Simulation on GPU 33rd

Efficient Metaballs-Based Collision Detection for VR Neurosu...

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33rd International Conference on Computer Animation and Social Agents, CASA 2020

作者： Shen, Yang Feng, Huiwei Su, Jian Pan, Junjun National Engineering Laboratory for Cyberlearning and Intelligent Technology Beijing Normal University Beijing China State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China Peng Cheng Lab Shenzhen China

ISBN: (纸本)9783030634254

This paper presents a novel hybrid model comprising both surface mesh and the metaballs which occupy organs’ interior for the soft tissue modeling. Through the utility of metaballs, we are capable of simplifying the organ interior using a set of overlapping spheres with different radii. We first develop an adaptive approach based on Voronoi Diagram for the initialization of inner metaballs. Then, we resort to global optimization and devise an electrostatic attraction technique to drive the metaballs to best fill the space inside the organ’s boundary. We simplify the surgical instrument as a collection of cylinders with different radii and orientation, and develop an adaptive collision detection method to facilitate the collision between the surgical instrument and metaballs. Our framework is built on the parallel computation architecture of CUDA, and thus can afford interactive performance on a commodity desktop. To illustrate the effectiveness, the above techniques have all been integrated into a VR-based ventriculoscopic surgery simulator. © 2020, Springer Nature Switzerland AG.

关键词： Graphics processing unit

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Rethinking ReID: Multi-Feature Fusion Person Re-identification Based on Orientation Constraints

Rethinking ReID: Multi-Feature Fusion Person Re-identificati...

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International Conference on Pattern Recognition

作者： Mingjing Ai Guozhi Shan Bo Liu Tianyang Liu State Key Lab of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9781728188089;9781728188096

Person re-identification (ReID) aims to identify the specific pedestrian in a series of images or videos. Recently, ReID is receiving more and more attention in the fields of computer vision research and application like intelligent security. One major issue downgrading the ReID model performance lies in that various subjects in the same body orientations look too similar to distinguish by the model, while the same subject viewed in different orientations looks rather different. However, most of the current studies do not particularly differentiate pedestrians in orientation when designing the network, so we rethink this problem particularly from the perspective of person orientation and propose a new network structure by including two branches: one handling samples with the same body orientations and the other handling samples with different body orientations. Correspondingly, we also propose an orientation classifier that can accurately distinguish the orientation of each person. At the same time, the three-part loss functions are introduced for orientation constraint and combined to optimize the network simultaneously. Also, we use global and local features int the training stage in order to make use of multi-level information. Therefore, our network can derive its efficacy from orientation constraints and multiple features. Experiments show that our method not only has competitive performance on multiple datasets, but also can let retrieval results aligned with the orientation of the query sample rank higher, which may have great potential in the practical applications.

关键词： Training Computer vision Computational modeling Focusing Pattern recognition Security Videos

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Analysis of correlation between image texture and friction coefficient of materials

Analysis of correlation between image texture and friction c...

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IEEE International Workshop on Imaging systems and Techniques (IST)

作者： Pengzhi Zhang Dangxiao Wang Yuru Zhang State Key Lab of Virtual Reality Technology and Systems Beihang University Beijing China

It is unknown that whether friction coefficients of materials can be predicted by their images. In this paper, we explore the correlation between the image gray-level and the friction coefficient of materials. We introduce a systematic approach to find the correlation model. First, four key features were extracted from Gray-Level Co-occurrence Matrix (GLCM) using Hue Saturation Intensity (HSI) color space. Second, BP neural network was utilized to establish the correlation model between the image gray-level and the friction coefficient. The proposed approach was validated using a dataset with 100 samples. The results show that the average regression error of the model is 16.7% for the 100 samples, and 2.8% for the subset of 30 fabric samples among the totals. Within those fabric samples, the prediction error for new samples is 20.1%. The experimental results indicate a possibility of inferring the friction coefficient from the image of the material. This study might provide a way of automatically constructing a haptic database through the large amount of images on the internet.

关键词： Instrumentation and measurement Two dimensional displays

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A tele-rehabilitation system with bilateral haptic feedback to both the therapist and the patient via time-delay environment

A tele-rehabilitation system with bilateral haptic feedback ...

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World Haptics Conference

作者： Xibo Wang Jiting Li State Key Lab of Virtual Reality Technology and Systems Beihang University Beijing China

In this paper, a bilateral tele-rehabilitation system capable of providing haptic feedback to both the therapist and the patient is proposed. As internet is used for communication in the proposed system, the problem of time delay must be solved, which may give rise to loss of transparency and even instability. To address the problem, a control strategy is designed, which could deal with not only constant time delay, but also time-varying delay. The feasibility of the proposed method is verified by experiments.

关键词： Force Haptic interfaces Delay effects Delays Observers Conferences virtual reality

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