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Fast Motion Vector Generation for Video Coding by Gray Prediction

Fast Motion Vector Generation for Video Coding by Gray Predi...

引用

International conference on computer graphics, imaging and Visualization, CGIV

作者： Dr. Yung-Gi Wu Guo-Feng Huang Department of Computer Science and Information Engineering Leader University Taiwan Institute of Applied Information Leader University Taiwan

In this paper, we propose an efficient prediction algorithm for motion vector in video compression. Motion estimation is an important part of any video processing system. Exhaustive block matching algorithm (EBMA) can get the optimal solution; however, it takes too much computational burden. In the proposed method, we use gray prediction to get the motion vectors. Gray prediction can predict the motion vectors quickly and accurately. Several video sequences are used to evaluate the performance. Experimental results show that the time needed by the proposed method is only 1.1% compared to EBMA and 3.25% to three steps searching (TSS) algorithm while the degradation of PSNRY compared to EBMA is about 0.8 dB at most for those test sequences.

关键词： Video coding Motion estimation Degradation Video compression Discrete cosine transforms computer science Prediction algorithms Video sequences Testing Motion compensation

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An Improved Approach on Visualization of Large-Scale Terrain Surface

An Improved Approach on Visualization of Large-Scale Terrain...

引用

International conference on computer graphics, imaging and Visualization, CGIV

作者： Huaiqing He Chong Wang Haohan Liu College of Computer Science and Technology Civil Aviation University of China China

We propose an improved approach on visualization of large-scale terrain surface based on ROAM algorithm, within this approach, we study the issue in two aspects: one is view-dependent LOD(level of detail) control, the other is out-of core data paging. An efficient data structure is introduced into the aspect of LOD control, on which coding method and none T- conjunction simplification algorithm is proposed. Meanwhile, the corresponding data conjunction method between different terrain blocks is given in the aspect of out-of core data paging. The purpose of employing such a data structure is to improve the efficient use of internal memory. The experiment results show that our approach achieves real-time LOD rendering for sufficient large-scale terrain and saves much internal memory compared with traditional R OAM algorithm.

关键词： Large-scale systems Data structures Data visualization Binary trees Tree data structures Helium Educational institutions computer science Merging Real time systems

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A Novel Adaptive Sampling by Tsallis Entropy

A Novel Adaptive Sampling by Tsallis Entropy

引用

International conference on computer graphics, imaging and Visualization, CGIV

作者： Qing Xu Mateu Sbert Lianping Xing Jianfeng Zhang School of Computer Science and Technology Tianjin University TJU Tianjin China Institute of Information and Applications University of Girona Girona Spain

Monte Carlo is the only choice of physically correct method to compute the problem of global illumination in the field of realistic image synthesis. Adaptive sampling is an appealing tool to eliminate noise, which is one of the main problems of Monte Carlo based global illumination algorithms. In this paper, we investigate the use of entropy in the domain of information theory to measure pixel quality and to do adaptive sampling. Especially we explore the nonextensive Tsallis entropy, in which a real number q is introduced as the entropic index that presents the degree of nonextensivity, to evaluate pixel quality. By utilizing the least-squares design, an entropic index q can be obtained systematically to run adaptive sampling effectively. Implementation results show that the Tsallis entropy driven adaptive sampling significantly outperforms the existing methods.

关键词： Sampling methods Entropy Monte Carlo methods Lighting Image sampling Pixel computer science Physics computing Image generation Noise level

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Gray Level Co-Occurrence Matrix Computation Based On Haar Wavelet

Gray Level Co-Occurrence Matrix Computation Based On Haar Wa...

引用

International conference on computer graphics, imaging and Visualization, CGIV

作者： M.M. Mokji S.A.R. Abu Bakar University of Technology Malaysia Malaysia

In this paper, a new computation for gray level co-occurrence matrix (GLCM) is proposed. The aim is to reduce the computation burden of the original GLCM computation. The proposed computation will be based on Haar wavelet transform. Haar wavelet transform is chosen because the resulting wavelet bands are strongly correlated with the orientation elements in the GLCM computation. The second reason is because the total pixel entries for Haar wavelet transform is always minimum. Thus, the GLCM computation burden can be reduced. The proposed computation is tested with the classification performance of the Brodatz texture images. Although the aim is to achieve at least similar performance with the original GLCM computation, the proposed computation gives a slightly better performance compare to the original GLCM computation.

关键词： Wavelet transforms Pixel Field programmable gate arrays computer architecture Hardware Testing Image segmentation Computational efficiency Image processing Sparse matrices

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A Novel Approach for Change Detection in Remote Sensing Image Based on Saliency Map

A Novel Approach for Change Detection in Remote Sensing Imag...

引用

International conference on computer graphics, imaging and Visualization, CGIV

作者： Minghui Tian Shouhong Wan Lihua Yue Department of Computer Science and Technology University of Science and Technology Hefei Anhui China

Detecting change of remote sensing images is very important for some applications such as tracking of moving objects and motion estimation. Traditional work on change detection has largely been based on segmentation approaches of a single feature. It excessively depends on the threshold of the single feature to determine whether the change of spectral information is caused by the change of object. The results of traditional change detection approaches can easily be affected by noise, blur, contrast level and brightness level. To overcome the deficiency, we improve the Itti visual saliency model and propose an effective and robust approach based on saliency map to detect real changed regions between two remote sensing images of a given scene acquired at different times. The results of the experiments indicate that our approach is very robust to noise, contrast level and brightness level.

关键词： Remote sensing Noise level Brightness Noise robustness Object detection Motion detection Tracking Motion estimation Image segmentation Layout

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Non Rigid Object Tracking in Aerial Videos by Combined Snake and Optical flow Technique

Non Rigid Object Tracking in Aerial Videos by Combined Snake...

引用

International conference on computer graphics, imaging and Visualization, CGIV

作者： Ellaiyan Jayabalan A. Krishnan R. Pugazendi Faculty of Computer Science K. S. R. College of Arts and Science Tiruchengode India KSR College of Engineering Tiruchengode Tamil Nadu India

Tracking of moving objects in video streams with considering different dynamic backgrounds is a challenging problem in a real time dynamic environment. The proposed approach uses an observation model based on optical flow information used to know the displacement of the objects present in the scene. After finding the moving regions in the initial frame, we are applying active contour model (ACM) to track the moving objects in the further frames dynamically. These models have been used as a natural means of incorporating flow information into the tracking. The formulation of the active contour model by incorporating an additional force driven optical flow field improves the tracking speed. This algorithm efficiently works to track for low contrast videos like aerial videos.

关键词： Videos Image motion analysis Active contours Tracking Educational institutions Vectors Art Retina Optical arrays Cameras

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Point Based Rendering of Implicit 4-Dimensional Surfaces

Point Based Rendering of Implicit 4-Dimensional Surfaces

引用

International conference on computer graphics, imaging and Visualization, CGIV

作者： Ron J. Balsys Kevin G. Suffern Faculty of Business and Informatics Central Queensland University Rockhampton QLD Australia Faculty of Information Technology Sydney University of Technology Broadway NSW Australia

We present a point based rendering algorithm that uses hyper-cubes to perform spatial subdivision in a 4D volume. A 4D function interval exclusion test is used to speed up the rendering of 4D Implicit surfaces in this hyper-volume. A 4D orthonormal basis function is used to define a 4D camera, which projects isometric or perspective views onto a plane in 4D for viewing. The technique requires evaluations of 4D implicit surface functions and gradients to render shaded images. The technique also allows for hidden surface elimination using a z-buffer modified for use in a 4D space. We give examples of its use in rendering some 4D surfaces and discuss problems with the technique. The algorithm can be generalised to higher dimensions.

关键词： Rendering (computer graphics) Testing Geometry Hypercubes Slabs Australia Books Informatics Information technology Cameras

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G2 Transition curve using Quartic Bezier Curve

G2 Transition curve using Quartic Bezier Curve

引用

International conference on computer graphics, imaging and Visualization, CGIV

作者： Azhar Ahmad R. Gobithasan Jamaluddin Md. Ali Department of Mathematics Sultan Idris University of Education Tanjung Malim Perak Malaysia Dept of Mathematics Universiti Malaysia Terengganu Kuala Terengganu Malaysia School of Mathematical Sciences Universiti Sains Malaysia Minden Penang Malaysia

A method to construct transition curves using a family of the quartic Bezier spiral is described. The transition curves discussed are S-shape and C-shape of G 2 contact, between two separated circles. A spiral is a curve of monotone increasing or monotone decreasing curvature of one sign. Thus, a spiral cannot have an inflection point or curvature extreme. The family of quartic Bezier spiral form which is introduced has more degrees of freedom and will give a better approximation. It is proved that the methods of constructing transition curves can be simplified by the transformation process and the ratio of two radii has no restriction, which extends the application area, and it gives a family of transition curves that allow more flexible curve designs.

关键词： Spirals Application software computer graphics Design automation Mathematics Shape Joining processes Constraint theory Road transportation Rail transportation

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On Skew Estimation and Correction of Text

On Skew Estimation and Correction of Text

引用

International conference on computer graphics, imaging and Visualization, CGIV

作者： M. Sarfraz S. A. Mahmoud Z. Rasheed Department of Information and Compute Science King Fahd University of Petroleum and Minerals Dhahran Saudi Arabia

This paper, in addition to reporting some existing techniques, proposes some new techniques for skew correction. It includes two novel document skew detection algorithms based on histogram statistics and connected component analysis. The histogram based algorithm works much efficient for detecting skew angle in which we analyze the lines as peaks and valleys on histogram. The connected component analysis is based on finding the connected components within a single line and considers them as one blob to estimate skew angle. The two methods have been experimented on various text documents and very promising results have been achieved given more than 99% accuracy. A comparative study has been reported to provide a detailed analysis of the proposed methods.

关键词： Optical character recognition software Histograms Algorithm design and analysis Feature extraction computer science Petroleum Minerals Detection algorithms Statistical analysis Image processing

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How Psychophysical Perception of Motion and Image relates to Animation Practice

How Psychophysical Perception of Motion and Image relates to...

引用

International conference on computer graphics, imaging and Visualization, CGIV

作者： Carol MacGillivray Thames Valley University UK

This paper investigates the difference between seeing and perceiving in animation. It analyses character design in the light of experiments in face recognition, in particular how iconic a character can be in design. It discusses whether a universal theory can be applied and if caricatures are really 'super-portraits' that echo how brains recall faces. The psychophysical perception of motion in animation is analysed in the light of animation principles such as 'squash and stretch' and 'isolation'. Using made and found examples, the paper looks at how signature movement and animation principles are now being supplemented or even supplanted by motion capture and posits what this means for animation in the future. The paper maps popular animation characters within two specially designed triangular charts for image and for motion. It analyses the resulting images in terms of perceived and received information, looking particularly at the region of empathic connection coined by Dr Masahiro Mori as the 'Uncanny Valley'. [1] By examining the different empathic demands motion capture makes on an audience it reaches the conclusion that both image and motion must be treated symbiotically for full analysis to be achieved.

关键词： Psychology Motion analysis Image analysis Image motion analysis Art Information analysis Face recognition Facial animation Symbiosis computer graphics

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