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检索条件"任意字段=Proceedings of SPIE-IS and T Electronic Imaging - Image Processing: Algorithms and Systems IV"

共 281 条记录，以下是131-140 订阅

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Complex wavelets versus gabor wavelets for facial feature extraction: A comparative study

Complex wavelets versus gabor wavelets for facial feature ex...

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proceedings of spie-is and t electronic imaging - image processing: algorithms and systems iv

作者： Sankaran, Harish Essaky Gotchev, Atanas Egiazarian, Karen Astola, Jaakko Institute of Signal Processing Tampere University of Technology P.O.Box 553 FIN-33101 Tampere Finland

In this paper two complex wavelet transforms, namely the Gabor wavelet transform and Kingsbury's Dual-tree Complex wavelet transform (Dt-CWt) are compared for their capabilities to extract facial features. the Gabor wavelets extract directional features from images and find frequent applications in computer vision problems of face detection and face recognition. the transform involves convolving an image with an ensemble of Gabor kernels, scale and directionally parameterized. As a result, a redundant image representation is obtained, where the number of transformed images is equal to the number of Gabor kernels used. However, repetitive convolution with 2-D Gabor kernels is a rather slow computational operation. the Dt-CWt is a recently suggested transform, which provides good directional selectivity in six different fixed orientations at dyadic scales with the ability to distinguish positive and negative frequencies. It has a limited redundancy of four for images and is much faster than the Gabor transform to compute. therefore, it arises as a good candidate to replace Gabor transform in applications, where the speed (i.e. on-line implementation) is a critical issue. We involve the two wavelet families in facial landmarks detection and compare their performance by statistical tests, e.g. by building Receiver Operating Characteristic (ROC) curves and by measuring the sensitivity of a particular feature extractor. We also compare results of Bayesian classification for the two families of feature extractors involved. © 2005 spie and IS&t.

关键词： Wavelet transforms

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Research of adaptive threshold model and its application in iris tracking

Research of adaptive threshold model and its application in ...

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Conference on electronic imaging and Multimedia technology iv

作者： Zhao, QJ tu, DW Wang, RS Gao, DM Shanghai Univ Sch Mechatron Engn Shanghai 200072 Peoples R China

ISBN: (纸本)081945592X

the relationship between gray value of pixels and macro-information in image has been analyzed with the method in statistical mechanics. After simulating and curve fitting with the experiment data by statistic and regression method, an adaptive threshold model between average gray value and image threshold has been proposed in terms of Boltzmann statistics. On the other hand, the image characteristics around the eye region and the states of eyeball also have been analyzed, and an algorithm to extract the eye feature and locate its position on the image has been proposed, furthermore, another algorithm has been proposed to find the iris characteristic line and then to coordinate the iris center. At last, considering the cases of head gesture, different head position, and the opening state of eyes, some experiments have been respectively done with the function based on the adaptive threshold model and the designed algorithms in eye-gaze input human-computer interaction (HCI) system. the experiment results show that the algorithms can widely be applied in different cases, and real-time iris tracking can be performed with the adaptive threshold model and algorithms.

关键词： image processing adaptive threshold Boltzmann statistics iris tracking characteristic line

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image processing on the patterns in dielectric barrier discharge at atmospheric pressure

Image processing on the patterns in dielectric barrier disch...

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Conference on electronic imaging and Multimedia technology iv

作者： Liu, SH Dong, LF Liu, FC He, YF Hebei Univ Coll Phys Sci & Technol Baoding 071002 Peoples R China

ISBN: (纸本)081945592X

Pattern formation is a process by which a spatially uniform state loses stability to a non-uniform state. A usual effective method for studying the property of patterns is to take pictures or record images of the patterns with digital cameras and get useful information from them. hi this work, the structure, the spatial frequency spectrum of the patterns, the precise location of the discharge filaments center and the distribution of the light emission density of filaments are analyzed with Matlab6.1. this work can provide a beneficial reference for researchers who study pattern dynamics in DBD system or other systems.

关键词： gas discharge pattern formations image processing dielectric barrier discharge

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A new method of view range evaluation for night view system

A new method of view range evaluation for night view system

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Conference on electronic imaging and Multimedia technology iv

作者： Li, SC Jin, WQ Zhu, ZP Dong, HY Beijing Inst Technol Dept Opt Engn Beijing 100081 Peoples R China

ISBN: (纸本)081945592X

View range is one of the main integrated performance indexes, and is also the important performance index needed to give when night view systems leave factory. A new objective view range evaluation method for night view system is proposed in this paper by using image processing technology, data fit, vision sense formula under glimmer light circumstance and other knowledge. With the help of the method, the paper has carried out four groups' experimentation with field situation of four kind's night view system. the result of view range calculation indicates that the new method not only has effectively improved the speed of view range measurement for night view system, but also possesses good precision and practicability.

关键词： view range night view system image processing image threshold contrast

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proceedings of spie-IS&t electronic imaging - image and Video Communications and processing 2005

Proceedings of SPIE-IS&T Electronic Imaging - Image and Vide...

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proceedings of spie-IS and t electronic imaging - image and Video Communications and processing 2005

the proceedings contain 53 papers from the proceedings of spie-IS&t electronic imaging - image and Video Communications and processing 2005. the topics discussed include: robust media processing on programmable power-constrained systems;building adaptive applications: on the need for congestion control;media rights and media security;digital media in the home: technical and research challenges;media delivery and media service overlays;challenges in media delivery systems and servers;video coding scheme using irregular binning and iterative decoding;architectural implications for high-quality video format conversion;subjective evaluation of de-interlacing techniques;and a multilevel projective image registration technique.

关键词： Multimedia systems

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A novel image processing and measurement system applied to quantitative analysis of simulated tooth root canal shape

A novel image processing and measurement system applied to q...

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Conference on electronic imaging and Multimedia technology iv

作者： Yong, t Yong, W Jin, GF Gao, XJ Tsing Hua Univ Dept Precis Instruments State Key Lab Precis Measurement Technol & Instru Beijing 100084 Peoples R China

ISBN: (纸本)081945592X

Dental pulp is located in root canal of tooth. to modem root canal therapy, "Root canal preparation" is the main means to debride dental pulp infection. the shape of root canal will be changed after preparation, so, when assessing the preparation instruments and techniques, the root canal shaping ability especially the apical offset is very important factor. In this paper, a novel digital image processing and measurement system is designed and applied to quantitative analysis of simulated canal shape. By image pretreatment, feature extraction, registration and fusion, the variation of the root canals' characteristics (before and after preparation) can be accurately compared and measured, so as to assess the shaping ability of instrutnents. When the scanning resolution is 1200dpi or higher, the registration and measurement precision of the system can achieve 0.021mm or higher. the performance of the system is tested by a series of simulated root canals and stainless steel K-files.

关键词： image processing system image registration image fusion root shaping root canal therapy

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the Application of image edge detection by using fuzzy technique

The Application of image edge detection by using fuzzy techn...

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Conference on electronic imaging and Multimedia technology iv

作者： Li, YH Liu, BQ Bin, Z Ordnance Engn Coll Dept Opt & Elect Engn Hebei Shijiazhuang 050003 Peoples R China

ISBN: (纸本)081945592X

A new method to deal with images by computer is put forward, which is more convenient for the eyes to identify and much easier to understand. As the edge is a basic feature of image, checking it is one of the most important parts in processing image. the traditional technique is to use the edge detection partial operator, which is to detect the gray level changes of neighbors of every pixel, and to detect the edge by using the changing regular of one-order or two-order directional differential coefficient. But sometimes there is uncertainty of the edge, and man can't distinguish whether it is the edge or not. In order to turn the fuzzy edge to be clear and solve the problem above, this paper mentions fuzzy enhancement to realize image edge detection. Fuzzy technology is a newly rising technology used in many fields, especially in the image processing, and fuzzy enhancement is one important part of the fuzzy technology. Based on this technology, this paper firstly sets the image fuzzy feature plane of the original image, secondly proceeds the fuzzy enhancement, and then detects the edge by Sobel differential arithmetic. At the end of the paper, it realizes the histogram algorithm and the fuzzy enhancing algorithm by Visual C++. Results of the experiment show that fuzzy enhancement is superior in image processing.

关键词： fuzzy enhancing histogram enhancing image edge detection

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A binary image enhancement and recognition approach in crack detection using exploring agents

A binary image enhancement and recognition approach in crack...

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Conference on electronic imaging and Multimedia technology iv

作者： Wei, W Ding, ML Wang, Q Harbin Inst Technol Dept Automat Measurement & Control Engn Harbin 150001 Peoples R China

ISBN: (纸本)081945592X

this paper proposes a method using exploring agent for the noise elimination and crack recognition in binary images which originate from the objective gray level images. A mean filtering method is introduced to correct non-uniform background illumination and obtain the dynamic thresholds, which are used to convert the original 255 scales gray level image into binary images. the pavement crack figures in the binary image have been contaminated by randomly distributed noisy dots, and in most cases, the crack shape and orientation can't be represented by specific functions. the exploring agent method using sense-compute-act loop, presented in this paper, can be employed to determine the crack and eliminate the random noise. the exploring agent and the Least Square Fit (LSF) method separately have unique characteristics in recognizing the crack intersection and orientation, and automatically running along the crack. the traces of the exploring agent are the skeleton of the pavement crack, and the number of steps can be used to calculate the length of the crack. the sense, compute, and act ability of the exploring agent iterate to guarantee the effect in processing randomly distributed features of image during the actual processing.

关键词： pavement crack detection image enhancement exploring agent pattern recognition

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proceedings of spie-IS&t electronic imaging - image and Video Communications and processing 2005

Proceedings of SPIE-IS&T Electronic Imaging - Image and Vide...

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proceedings of spie-IS and t electronic imaging - image and Video Communications and processing 2005

the proceedings contain 55 papers from the proceedings of spie-IS&t electronic imaging - image and Video Communications and processing 2005. the topics discussed include: technologies for multimedia and video surveillance convergence;WCAM: smart encoding for wireless surveillance: WCAM: secured video surveillance with digital rights management;seamless wireless networking for video surveillance applications;smart video surveillance system preserving privacy;systematic acquisition of audio classes for elevator surveillance;object tracking in low-frame-rate video;embedded vision platform for video surveillance systems;and modeling of pedestrian motion for recognition.

关键词： image segmentation

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Selecting appropriate gamut mapping algorithms based on a combination of image statistics

Selecting appropriate gamut mapping algorithms based on a co...

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proceedings of spie-IS and t electronic imaging - Color imaging X: processing, Hardcopy, and Applications

作者： Sun, Pei-Li Zheng, Zhong-Wei Dept. of Information Management Shih Hsin University Taiwan Dept. of Graphic Communications and Digital Publishing Shih Hsin University Taiwan

ISBN: (纸本)0819456403

Color gamut mapping has been recognized as one of the key elements for accurate image reproduction. A variety of gamut mapping algorithms (GMAs) has been proposed to minimize the image differences between originals and their reproductions across different media. However, the use of a single-GMA is normally unable to fulfill all types of image reproductions. therefore, we doubt if itis a right way to further improve the performance of a single algorithm while increasing its complexity. In this study, we propose an optimal multi-GMAs approach based on image analysis to select an appropriate GMA from a range of LUt-type GMAs to give the image the best treatment at low-computational cost. Because there are too many image statistics can be extracted from an image, the present study introduces methods to select the principal statistics for the GMA selection. to save the cost for real-tune image analysis, the importance of scanning patterns and image compression was investigated as well. the results suggested that the performance of the above applications would be enhanced to a certain level if we choose appropriate image statistics for calculation. © 2005 spie and IS&t.

关键词： Color image processing

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