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检索条件"任意字段=Conference on Visual Communications and Image Processing 2008"

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An Integrated Model for Generating 3D Point Clouds and Segmentation from 2D images

An Integrated Model for Generating 3D Point Clouds and Segme...

引用

International conference on Imaging, Signal processing and Communication (ICISPC)

作者： Huan-Yu Chen Chuen-Horng Lin Yan-Yu Lin Yung-Kuan Chan Department of Computer Science and Information Engineering National Taichung University of Science and Technology No. 129 Sec.3 Sanmin Rd Taichung Taiwan R.O.C Department of Management Information Systems National Chung Hsing University 145 Xingda Rd.South Dist Taichung Taiwan R.O.C

ISBN: (数字)9798350367157

ISBN: (纸本)9798350367164

This study presents a cost-effective approach to constructing simulation systems by integrating 2D visual processing with neural network technology for simultaneous 3D point cloud generation and part segmentation, thereby reducing time and costs. We propose multiple task-specific models using 2D RGB images, incorporating attention mechanisms, feature encoding, decoding layers, and innovative loss functions. The optimal models are merged to form an integrated system, evaluated using public and self-built datasets. Our experiments demonstrate that the integrated model effectively reduces training time and Floating Point Operations (FLOP) values while maintaining high accuracy in Critical Hole Distance (CHD), Earth Mover’s Distance (EMD), and Intersection over Union (IOU) metrics. This advancement enhances applications in military training, aerospace technology, and disaster response simulation, facilitating faster 3D object construction.

关键词： Training Point cloud compression image segmentation Solid modeling Adaptation models visualization Three-dimensional displays

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High Capacity Steganographic Method Using JPEG-Compressed images

High Capacity Steganographic Method Using JPEG-Compressed Im...

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2011 IEEE International conference on Information Theory and Information Security(ICITIS 2011)

作者： Xiuze Dong 1) ,2),3) , Ru Zhang, 1),3) , Xinxin Niu 1) , Yixian Yang 1) 1) Information Security Center, Beijing University of Posts and Telecommunications, Beijing, China 2) Beijing Electronic Science and Technology Institute, Beijing, China 2) Key Laboratory of Information Network Security, Ministry of Public Security, Shanghai, China

In this paper, a novel steganographic method based on joint photographic expert-group (JPEG) is proposed. The proposed method embeds two secret bits into each middle frequency coefficient using the least two-significant bits (2- LSBs). For the rest coefficients, the quantization error, resulting from processing the JPEG-compressed image, is compensated while embedding variable-length secret bits. At last, a JPEG stego-image is generated using the quality factor with the value of 100. Experimental results show that, the proposed steganographic method can provide a high information hiding capacity and keep the visual quality well.

关键词： Steganography Cover-image Stego-image

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A computational model of neural contour processing: figure-ground segregation and illusory contours

A computational model of neural contour processing: figure-g...

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Proceedings of the From Perception to Action conference

作者： F. Heitger R. von der Heydt O. Kubler Communication Technology Laboratory Swiss Federal Institute of Technology Zurich Switzerland Department of Neuroscience Johns Hopkins School of Medicine Baltimore MD USA

We present a computational model of contour processing that was suggested by neurophysiological recordings from the monkey visual cortex. The model employs convolutions and nonlinear operations, but no feedback loops. Contours are defined by the local maxima of the responses of a contour operator that sums a representation of contrast borders and a "grouping signal". The grouping consists in convolving a representation of "key points", such as T-junctions, corners, and line ends, with a set of orientation selective kernels, and a nonlinear pairing operation. The grouping scheme is selective according to whether the configuration of key points is consistent with the interpretation of occlusion. The resulting contour representation includes an indicator of figure ground direction. We show: that the model reproduces illusory contours in accurate agreement with perception; and generates representations of occluding contours on images of natural scenes that are more complete and less cluttered by spurious connections of foreground and background than those obtained by conventional edge detection operators.

关键词： Computational modeling Layout image edge detection Brain modeling communications technology Laboratories Electronic mail Convolution Feedback loop Kernel

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A Modified Iterative Equalization Scheme based on Precoding

A Modified Iterative Equalization Scheme based on Precoding

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2008 the IET 2ND International conference on Wireless,Mobile & Multimedia Networks

作者： Shuangshuang Han Dongfeng Yuan Xiang Cheng School of Information Science and Engineering Shandong University Joint Research Institute for Signal and Image Processing School of EPSHeriot-Watt University

This paper proposes a modified iterative equalization(MIE) scheme based on *** we analyze and compare the performance of the improved MAX-Log-MAP(I-MLM) algorithm called MIE-1-MLM scheme and two traditional equalization algorithms in MIE ***,based on the good understanding of the performance of precoding and MIE-I-MLM scheme,we exploit precoding in MIE-I-MLM, and then find that the performance of precoded MIE-I-MLM is obviously better than that of non-precoded and can even exceed the bound of an ISI-free channel in higher SNR,while its performance is lower than the one of non-precoded in low ***,we propose a novel scheme to get better performance by using a mixture of precoded and nonprecoded *** analytical and simulation results demonstrate that the proposed novel scheme can achieve better performance without increase in computational complexity.

关键词： Inter-symbol interference(ISI) maximum a posteriori(MAP) precoding turbo equalization(TE)

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An Improved Normalized BP Based Decoding Algorithm for LDPC Codes

An Improved Normalized BP Based Decoding Algorithm for LDPC ...

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2008 the IET 2ND International conference on Wireless,Mobile & Multimedia Networks

作者： Haigang Zhang Dongfeng Yuan Cheng-Xiang Wang School of Information Science and Engineering Shandong University Joint Research Institute for Signal and Image Processing School of Engineering & Physical SciencesHeriot-Watt University

A uniformly most powerful(UMP) belief propagation(BP) based algorithm is referred to as a simplified version of a BP algorithm with reduced complexity but performance loss for low density parity check(LDPC) *** compensate the performance loss,the normalized BP based algorithm was proposed,where the normalization factor was derived by mean ratio or by minimizing the mean square *** this paper,an improved novel normalized BP based algorithm is *** normalization uses multiplicative factor instead of divisional *** novel scheme shows better performance than the existing normalized BP based algorithms while keeping the same implementation *** simulation is done for two kinds of LDPC codes:random constructed codes and finite geometry codes. At high signal-to-noise ratio(SNR) region,the proposed scheme can achieve even better performance than BP algorithm for short length random constructed LDPC codes.

关键词： LDPC codes BP algorithm Normalized BP

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Accommodation and Vergence Responses to Electronic Holographic Displays Compared with Those to Stereoscopic Displays

Accommodation and Vergence Responses to Electronic Holograph...

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conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： Haruki Mizushina Ippei Negishi Junya Nakamura Yasuhiro Takaki Hiroshi Ando Shinobu Masaki Tokushima University Tokushima Japan Kanazawa Institute of Technology Ishikawa Japan Tokyo University of Agriculture and Technology Tokyo Japan National Institute of Information and Communications Technology Osaka Japan Advanced Telecommunications Research Institute International Kyoto Japan

ISBN: (纸本)9781728164021

Electronic holography is an ideal 3D display technique to ameliorate vergence-accommodation conflict, which is a possible cause of visual fatigue and discomfort from viewing conventional stereoscopic 3D displays. Previous studies have measured accommodative and vergence responses to holographic images and real objects, and reported that they are in good agreement. To demonstrate the effectiveness of electronic holography as a solution of vergence-accommodation conflict caused by viewing conventional stereoscopic 3D displays, we measured accommodative and vergence responses to reconstructed images of holograms and two-view stereoscopic images. We also measured responses to real objects located at various distances as a baseline condition. The results indicate that the accommodative response to the electro-holographic display changes with the vergence response in a similar manner, as is the case with real objects as compared to conventional two-view stereo display. This suggests that the holographic display technology is a promising candidate for resolving the vergence-accommodation conflict.

关键词： visualization Three-dimensional displays image resolution Stereo image processing Industry applications Virtual reality Human factors

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A subpixel algorithm using interpolation method based on normal direction

A subpixel algorithm using interpolation method based on nor...

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2008 International conference on Optical Instruments and Technology

作者： GONG Li WANG Zhong LI Chao State Key Laboratory of Precision Measuring Technology and Instruments of Tianjin University, Tianjin 300072

As one branch of subpixel technology,curve interpolation method is the most popular for its higher precision and less *** the method has longer running time and bigger direction error,since it makes use of convolution between direction templates and pixel gray values to get Gradient direction which is interpolating *** a new method is proposed in which unisometric cubic spline interpolation is operated along the normal direction of the *** illustrates not only how to choose sampling points for interpolation,but also how to figure node values of those points,then establishes the suitable interpolating boundary *** method reduces not only the uncertainty but also the runtime to 1/2,and improves measuring precision and efficiency.

关键词： image processing visual measurement subpixel curve fitting cubic spline interpolation

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Application of Remote Sensing Technology in Cao Feidian Coastal Zone Monitoring

Application of Remote Sensing Technology in Cao Feidian Coas...

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2010 Second IITA International conference on Geoscience and Remote Sensing (IITA-GRS 2010)

作者： Wang Juan1,2,1 North China Sea Environmental Monitoring Center,SOA 2 Key Laboratory of Marine Spill Oil Identification and Damage Assessment Technology,SOA Qingdao,China Cui Wenlin12 1 North China Sea Environmental Monitoring Center,SOA 2 Key Laboratory of Marine Spill Oil Identification and Damage Assessment Technology,SOA Qingdao,China

Using 5 periods' remote sensing images covering 20 years from 1985 to 2008 of Cao Feidian,this paper extracted the coastline and the wetlands from different years utilizing different methods and techniques of data image processing and visual interpretation based on the characteristic of each RS *** paper analyzed the law of the coastline and the wetlands changes in both spatial and temporal aspects,and then discussed the major influential factor to the changes by analyzing natural and artificial *** results indicated that the total coastline and the artificial coastline increased,while the natural seashore disappeared and wetlands slight increase in the 1985-2008.

关键词： Coastal zones,coastlines,wetlands,remote sensing,Cao Feidian

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A Real Time Spatial/Temporal/Motion Integrated Surveillance System in Compressed Domain

A Real Time Spatial/Temporal/Motion Integrated Surveillance ...

引用

International conference on Intelligent Systems Design and Applications (ISDA)

作者： Chen-Chiung Hsieh Wei-Ru Lai Albert Chiang Department of Computer Science and Engineering Tatung University Taipei Taiwan Department of Communications Engineering Yuan-Ze University Taoyuan Taiwan Hgiga Inc. HsinChu Taiwan

We designed a real time moving object extraction and behavior analysis system to detect if any abnormal behavior like intrusion, halt, and wall climbing happened. Much work in the area of motion based video object segmentation is being done in the pixel domain which exploits the visual attributes and motion information. Given most existing images and videos stored in the compressed form, the specific manipulation algorithms can be applied to the compressed streams without full decoding of the compressed images/videos. In this paper, we could produce motion masks from I and P frames in MPEG video. Then, motion vectors decoded directly from P frames could be utilized to do object extraction. By clustering motion vectors conforming to the same motion, we could extract the moving regions. If moving regions are connected closely and of the same direction, they are claimed to be of the same moving object. Following the motion vectors in consecutive P frames, we could track the moving objects. A confidence is defined from these matched blocks. Finally, a couple of criterions are defined for object behavior analysis whether they intrude a monitored area, halt on road, or climb wall. Experimental results are given to demonstrate the feasibility of our system.

关键词： Real time systems Surveillance Video compression image coding Decoding Data mining Object detection Object segmentation Clustering algorithms Streaming media

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A Review on Feature Extraction Techniques in Content Based image Retrieval

A Review on Feature Extraction Techniques in Content Based I...

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International conference on Wireless communications, Signal processing and Networking

作者： Jigisha M. Patel Nikunj C. Gamit Department of Computer Engineering C.G.P.I.T Uka Tarsadia University Bardoli India

ISBN: (纸本)9781467393393

The Content Based image retrieval (CBIR) is a very important for retrieving the most visual relevant images from the large image database. The various low level features are extracted based on their visual content which are color, shape, texture etc. The paper gives the overview of color and texture feature extraction techniques like color histogram, color correlogram, color co-occurrence matrix and tamura texture feature, steerable pyramid, wavelet transform, Gabor wavelet transform respectively and also the comparative analysis of this techniques is shown in the paper.

关键词： CBIR Feature extraction Color histogram Color correlogram DCD CCM Tamura feature Wavelet transform GWT

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