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32nd Asian conference on Remote Sensing 2011, ACRS 2011

作者： Kim, Jung-Rack Lin, Shih-Yuan Kim, Young Hwi Department of Geoinformatics University of Seoul Seoulsiripdaero 163 Dongdaemum-gu Seoul 130-743 Korea Republic of Department of Land Economics National Chengchi University 64 Sec. 2 Zhinan Rd. Wenshan Dist. Taipei 11605 Taiwan Department of Computer Science Yonsei University Shinchoen-dong Seadeamun-gu Seoul 120-749 Korea Republic of

ISBN: (纸本)9781618394972

In inaccessible topographies such as the planetary surface, stereo analysis of in orbital imagery provides highly valuable data for scientific research. In order to fully utilize the data derived from image systems carried on various planetary orbiters, the generalised algorithms of stereo image processing and photogrammetric Mars DTM extraction have been developed by Kim and Muller (2009). In this study, the integration and improvement of these algorithms were proposed. It is enhanced with the feed-forwarded model based matcher exploiting planetary topographic data hierarchy. Due to the successful "from medium to high" control strategy performed during processing, stable horizontal and vertical photogrammetric accuracy of resultant DTMs were achievable, even without directly measured ground control information. To demonstrate the potential of the stereo routines, the DTMs obtained from various orbital images such as HRSC (High Resolution Stereo Camera) of Mars Express, CTX (Context Camera) and HiRISE (High Resolution Imaging Science Experiment) of MRO (Mars Reconnaissance Orbiter) were processed in few sample test sites. The comparisons with the height spots of MOLA (Mars Obiter Laser Altimeter) showed high agreements and proved the effectiveness of overall processing strategy.

关键词： Stereo image processing

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Application of weighted nuclear norm denoising algorithm in diffusion-weighted image

Application of weighted nuclear norm denoising algorithm in ...

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International conference on Mechatronics and Intelligent Robotics, ICMIR 2018

作者： Li, Sijie He, Jianfeng Yi, Sanli School of Information Engineering and Automation Kunming University of Science and Technology Kunming650500 China

ISBN: (纸本)9783030002138

Diffusion-weighted imaging is a noninvasive method for detecting the diffusion of water molecules in living tissues, which requires high accuracy of the data. Diffusion-weighted images have a high degree of self-similarity. And it is widely used in the nerve fiber tracking in human brain. According to the characteristics of the image, the weighted nuclear norm denoising algorithm is proposed for the diffusion-weighted images denoising. By processing similar blocks of the image, the image can be reconstructed. The algorithm is compared with some traditional algorithms and we propose a new method to describe the denoising effect. The experiment shows that the weighted nuclear norm denoising algorithm makes good use of the self-similarity of the diffusion-weighted images, and achieves the purpose of image denoising through the processing of similar blocks. Can obtain better results from the proposed algorithm, the accuracy and validity of DTI data are improved, and it is very helpful for the subsequent processing of the image. © Springer Nature Switzerland AG 2019.

关键词： image denoising

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Signature-Based Document image Retrieval

Signature-Based Document Image Retrieval

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10th European conference on Computer Vision (ECCV 2008)

作者： Zhu, Guangyu Zheng, Yefeng Doermann, David Univ Maryland College Pk MD 20742 USA Siemens Corporate Res Princeton NJ 08540 USA

ISBN: (纸本)9783540886891

As the most pervasive method of individual identification and document authentication, signatures present convincing evidence and provide an important form of indexing for effective document image processing and retrieval in a broad range of applications. In this work, we developed a fully automatic signature-based document image retrieval system that handles: 1) Automatic detection and segmentation of signatures from document images and 2) Translation, scale, and rotation invariant signature matching for document image retrieval. We treat signature retrieval in the unconstrained setting of non-rigid shape matching and retrieval, and quantitatively study shape representations, shape matching algorithms, measures of dissimilarity, and the use of multiple query instances in document image retrieval. Extensive experiments using large real world collections of English and Arabic machine printed and handwritten documents demonstrate the excellent performance of our system. To the best of our knowledge, this is the first automatic retrieval system for general document images by using signatures as queries, without manual annotation of the image collection.

关键词： image segmentation

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Versatile multistandard digital TV encoder based on programmable hardware (CPLD)

Versatile multistandard digital TV encoder based on programm...

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ICCDCS 2000: 3rd IEEE International conference on Devices, Circuits and systems

作者： Mondwurf, Stephan W. Univ of Wuppertal Wuppertal Germany

After giving a description of the three underlying standards of the digital video broadcasting system (DVB-S: satellite, DVB-C: cable and DVB-T: terrestrial), this paper discusses the synergy effects, which can be used to design a versatile multistandard digital television encoder with minimum hardware requirements. The paper shows the implementation possibilities of the signal-processing algorithms in Complex Programmable Logic Devices (CPLDs) at the example of a highly integrated digital TV encoder, which has been realized at the Chair of Communications Technology for measurement purposes.

关键词： image coding

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Quality control by HyperSpectral Imaging (HSI) in solid waste recycling: logics, algorithms and procedures

Quality control by HyperSpectral Imaging</i...

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conference on image processing - Machine Vision Applications VII

作者： Bonifazi, Giuseppe Serranti, Silvia Univ Roma La Sapienza Dept Chem Engn Mat & Environm I-00184 Rome Italy

ISBN: (纸本)9780819499417

In secondary raw materials and recycling sectors, the products quality represents, more and more, the key issue to pursuit in order to be competitive in a more and more demanding market, where quality standards and products certification play a preheminent role. These goals assume particular importance when recycling actions are applied. Recovered products, resulting from waste materials, and/or dismissed products processing, are, in fact, always seen with a certain suspect. An adequate response of the industry to the market can only be given through the utilization of equipment and procedures ensuring pure, high-quality production, and efficient work and cost. All these goals can be reached adopting not only more efficient equipment and layouts, but also introducing new processing logics able to realize a full control of the handled material flow streams fulfilling, at the same time, i) an easy management of the procedures, ii) an efficient use of the energy, iii) the definition and set up of reliable and robust procedures, iv) the possibility to implement network connectivity capabilities finalized to a remote monitoring and control of the processes and v) a full data storage, analysis and retrieving. Furthermore the ongoing legislation and regulation require the implementation of recycling infrastructure characterised by high resources efficiency and low environmental impacts, both aspects being strongly linked to the waste materials and/or dismissed products original characteristics. For these reasons an optimal recycling infrastructure design primarily requires a full knowledge of the characteristics of the input waste. What previously outlined requires the introduction of a new important concept to apply in solid waste recycling, the recycling-oriented characterization, that is the set of actions addressed to strategically determine selected attributes, in order to get goal-oriented data on waste for the development, implementation or improvement of recycling

关键词： Industrial processing solid waste recycling hyperspectral imaging NIR spectroscopy quality control and certification

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Real-time, free-viewpoint video rendering from volumetric geometry

Real-time, free-viewpoint video rendering from volumetric ge...

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conference on Visual Communications and image processing 2003

作者： Goldlücke, B Magnor, M Max Planck Inst Informat D-66123 Saarbrucken Germany

ISBN: (纸本)0819450235

The aim of this work is to render high-quality views of a dynamic scene from novel viewpoints in real-time. An online system available at our institute computes the visual hull as a geometry proxy to guide the rendering at interactive rates. Because only a sparse set of cameras distributed around the scene is used to record the scene, only an coarse model of the scene geometry can be recovered. To alleviate this problem, we render textured billboards defined by the voxel model of the visual hull, preserving details in the source images while achieving excellent performance. By exploiting multi-texturing capabilities of modern graphics hardware, real-time frame rates are attained. Our algorithm can be used as part of an inexpensive system to display 3D-videos, or ultimately even in live 3D-television. The user is able to watch the scene from an arbitrary viewpoint chosen interactively.

关键词： Cameras Visualization Visual process modeling RGB color model Video 3D modeling Computing systems 3D image processing Calibration Reconstruction algorithms

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How to choose the best embedded processing platform for on-board UAV image processing? 10

How to choose the best embedded processing platform for on-b...

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10th International conference on Computer Vision Theory and Applications, VISAPP 2015

作者： Hulens, Dries Verbeke, Jon Goedemé, Toon EAVISE KU Leuven Sint-Katelijne-Waver Belgium Propolis KU Leuven Oostende Belgium

ISBN: (纸本)9789897580918

For a variety of tasks, complex image processing algorithms are a necessity to make UAVs more autonomous. Often, the processing of images of the on-board camera is performed on a ground station, which severely limits the operating range of the UAV. Often, offline processing is used since it is difficult to find a suitable hardware platform to run a specific vision algorithm on-board the UAV. First of all, it is very hard to find a good trade-off between speed, power consumption and weight of a specific hardware platform and secondly, due to the variety of hardware platforms, it is difficult to find a suitable hardware platform and to estimate the speed the user's algorithm will run on that hardware platform. In this paper we tackle those problems by presenting a framework that automatically determines the most-suited hardware platform for each arbitrary complex vision algorithm. Additionally, our framework estimates the speed, power consumption and flight time of this algorithm for a variety of hardware platforms on a specific UAV. We demonstrate this methodology on two real-life cases and give an overview of the present top processing CPU-based platforms for on-board UAV image processing.

关键词： Unmanned aerial vehicles (UAV)

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Computational Visual Media 1

Computational Visual Media

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丛书名： Lecture Notes in Computer Science

1000年

作者： Piotr Didyk Junhui Hou

ISBN: (数字)9789819658121

ISBN: (纸本)9789819658114

This book constitutes the refereed proceedings of CVM 2025, the 13th International conference on Computational Visual Media, held in Hong Kong SAR, China, in April 2025. The 67 full papers were carefully reviewed and selected from 335 submissions. The papers are organized in topical sections as follows: Part I: Medical image Analysis, Detection and Recognition, image Enhancement and Generation, Vision Modeling in Complex Scenarios Part II: 3D Geometry and Rendering, Generation and Editing, image processing and Optimization Part iii: image and Video Analysis, Multimodal Learning, Geometrical processing, Applications

关键词： image processing and Computer Vision Pattern Recognition Computer Applications Computer Graphics Artificial Intelligence algorithms

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Performance analysis of algorithms for retrieval of magnetic resonance images for interactive teleradiology

Performance analysis of algorithms for retrieval of magnetic...

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Medical Imaging 2001 conference

作者： Atkins, MS Hwang, R Tang, S Simon Fraser Univ Sch Comp Sci Burnaby BC V5A 1S6 Canada

ISBN: (纸本)0819440051

We have implemented a prototype system consisting of a Java-based image viewer and a web server extension component for transmitting Magnetic Resonance images (MRI) to an image viewer, to test the performance of different image retrieval techniques. We used full-resolution images, and images compressed/decompressed using the Set Partitioning in Hierarchical Trees (SPIHT) image compression algorithm. We examined the SPIHT decompression algorithm using both non-progressive and progressive transmission, focussing on the running times of the algorithm, client memory usage and garbage collection. We also compared the Java implementation with a native C++ implementation of the non-progressive SPIHT decompression variant. Our performance measurements showed that for uncompressed image retrieval using a 10Mbps Ethernet, a film of 16 MR images can be retrieved and displayed almost within interactive times. The native C++ code implementation of the client-side decoder is twice as fast as the Java decoder. If the network bandwidth is low, the high communication time for retrieving uncompressed images may be reduced by use of SPIHT-compressed images, although the image quality is then degraded. To provide diagnostic quality images, we also investigated the retrieval of up to 3 images on a MR film at full-resolution, using progressive SPIHT decompression. The Java-based implementation of progressive decompression performed badly, mainly due to the memory requirements for maintaining the image states, and the high cost of execution of the Java garbage collector. Hence, in systems where the bandwidth is high, such as found in a hospital intranet, SPIHT image compression does not provide advantages for image retrieval performance.

关键词： image compression Java Magnetic resonance imaging Teleradiology image retrieval Reconstruction algorithms Magnetism C++ image processing algorithms and systems Telecommunications

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Adaptive ground clutter suppression for conformal array radar systems

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IET RADAR SONAR AND NAVIGATION 2009年第4期3卷 357-372页

作者： Hersey, R. K. Melvin, W. L. McClellan, J. H. Culpepper, E. Georgia Inst Technol Georgia Tech Res Inst Sensors & Electromagnet Applicat Lab Atlanta GA 30332 USA Georgia Inst Technol Dept Elect & Comp Engn Ctr Signal & Image Proc Atlanta GA 30332 USA USAF Res Lab Sensors Directorate Wright Patterson AFB OH USA

Conformal arrays (CFAs) possess certain desirable characteristics for deployment on unmanned aerial vehicles and other payload-limited platforms. However, the CFA non-planar geometry induces clutter non-stationarity, resulting in elevated signal-to-interference-plus-noise ratio (SINR) loss when applying conventional space-time adaptive processing (STAP) algorithms. Non-stationary clutter leads to covariance matrix estimation error and, consequently, an erroneous STAP frequency response. In this study, the authors examine two practical conformal antenna configurations: a belly-mounted canoe and a nose-mounted, chined shape. Using high-fidelity signal models, the authors show traditional STAP losses in excess of 10 dB because of the effects of clutter non-stationarity. The authors then investigate a number of ameliorating techniques compatible with standard STAP implementation, including localised processing, localised processing with time-varying weights, equivalent uniform linear array transformation, angle-Doppler warping and higher-order angle-Doppler warping. The authors demonstrate very good performance for the higher-order angle-Doppler warping method applied to the chined radome shape, with peak adaptive SINR losses reduced from nearly 16 dB for the uncompensated case to 3 dB of loss consistent with performance attainable in a homogeneous clutter environment. The authors also find good performance for three-dimensional angle-Doppler warping over azimuth, elevation and Doppler when applied to the tapered canoe shape, with uncompensated losses of roughly 14 dB reduced to 3 dB, again a level compatible with STAP applied in a homogeneous clutter environment. The authors thus show that CFA STAP can yield performance similar to that of a conventional planar array when using appropriate compensation methods.

关键词： signal-to-interference-plus-noise ratio equivalent uniform linear array transformation unmanned aerial vehicles covariance matrix estimation error nonplanar geometry conformal antennas Doppler shift planar antenna arrays conformal array radar systems Radar equipment, systems and applications angle-Doppler warping localised processing conventional planar array Antenna arrays ameliorating techniques three-dimensional angle-Doppler warping radar clutter adaptive ground clutter suppression adaptive radar payload-limited platforms conformal antenna time-varying weights

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