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Displaying images on mobile devices: capabilities, issues, and solutions

Displaying images on mobile devices: capabilities, issues, a...

引用

IEEE International conference on image processing

作者： Jiebo Luo A. Singhal G. Braun R.T. Gray O. Seignol N. Touchard Electronic Imaging Products R & D Eastman Kodak (Japan) Limited USA

Wireless imaging is enabling visual communication "anytime anywhere" to become a reality. A key technical challenge is how to achieve best perceived image quality given the limited screen size and display bit depth of the mobile devices. We give an overview of the current capabilities of various mobile devices, highlight some of the technical issues, and present potential solutions. In addition, we present a review of some of the software products on the market and look ahead to the trend towards more capable devices.

关键词： Videos Bandwidth Rendering (computer graphics) image quality Optical imaging Color Buffer storage Computer displays Personal digital assistants Handheld computers

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Reliability measurement of disparity estimates for intermediate view reconstruction

Reliability measurement of disparity estimates for intermedi...

引用

IEEE International conference on image processing

作者： L. Zhang D. Wang A. Vincent Communications Rcscarch Centre Ottawa ONT Canada

Proposes an algorithm for improving the image quality of disparity-based intermediate view reconstruction by introducing a reliability measurement for disparity estimates. The reliability of disparity estimates is measured with a criterion based on a-posteriori probability of disparity estimates, in which the displaced image intensity difference and the variation of disparity estimates are taken into account. This reliability measurement is then integrated into an intermediate view reconstruction approach, which guides the recovery of disparity values in occluded areas and the reconstruction of the intermediate views. Experimental results with natural stereoscopic sequences show that the disparity reliability measurement is quite effective. The proposed algorithm improves the image quality of reconstructed intermediate views.

关键词： image reconstruction image quality Displacement measurement Laplace equations Area measurement Interpolation Motion measurement Bidirectional control Cameras image texture

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image comparison measure for digital still color cameras

Image comparison measure for digital still color cameras

引用

IEEE International conference on image processing

作者： A. Rajeev Ramanath B.W. Snyder C.D. Hinks Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA Department of Textiles Engineering Chemistry and Science North Carolina State University Raleigh NC USA

A measure is developed for comparing complex scenes produced by single-chip digital color cameras. The proposed measure is based on the CIELAB color space with appropriate considerations to the sensitivity of the human visual system (HVS) when viewing a complex scene. For comparison purposes, the error measures proposed have been implemented using the /spl Delta/E/sub ab//sup */, /spl Delta/E/sub 94//sup */ and the recently recommended CIEDE2000 color differences.

关键词： Digital cameras Layout Color Lighting Humans Semiconductor device measurement Histograms image quality Filters Textiles

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Iterative source-channel decoding for robust image transmission

Iterative source-channel decoding for robust image transmiss...

引用

International conference on Acoustics, Speech, and Signal processing (ICASSP)

作者： Jörg Kliewer Norbert Görtz Institute for Circuits and Systems Theory University of Kiel Kiel Germany Institute for Communications Engineering Munich University of Technology Munich Germany

In this paper we discuss the application of a joint source-channel decoding approach to image transmission over wireless channels. In addition to channel codes, also the implicit residual redundancy after source encoding in both horizontal and vertical direction is utilized for error protection. At the decoder we use an iterative (“turbo”) source-channel decoder which can be obtained in the same manner as for serially concatenated channel codes. As a new result we show that this iterative decoding scheme in combination with a novel simplified joint source and channel coding rate allocation at the encoder can be successfully employed for protecting the image data, especially when the channel is highly corrupted. Furthermore, when the source correlations are approximated with a large training set at the decoder, only a small loss in performance is observed.

关键词： Decoding Markov processes Channel estimation Erbium Estimation AWGN Pixel

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Directional wavelet transforms and frames

Directional wavelet transforms and frames

引用

IEEE International conference on image processing

作者： V. Velisavljevic P.L. Dragotti M. Vetterli Laboratoire de Communications Audiovisuelles (LCAV) École Polytechnique Fédérale de Lausanne Lausanne Switzerland Electrical Engineering and Computer Science Department University of California Berkeley Berkeley CA USA

The application of the wavelet transform in image processing is most frequently based on a separable transform. Lines and columns in an image are treated independently and the basis functions are simply products of corresponding one-dimensional functions. Such a method keeps simplicity in design and computation. A new two-dimensional approach is proposed, which retains the simplicity of separable processing, but allows more directionalities. The method can be applied in many areas like denoising, nonlinear approximation and compression. The results on nonlinear approximation and denoising show interesting gains compared to the standard two-dimensional analysis.

关键词： Wavelet transforms Noise reduction Discrete wavelet transforms Linear approximation Computer science Application software image coding Counting circuits Computational complexity Filters

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Invariant extraction and segmentation of 3D objects using linear Lie algebra model

Invariant extraction and segmentation of 3D objects using li...

引用

IEEE International conference on image processing

作者： Junhui Chao M. Suzuki Department . of Electrical Electronic Engineering and Communications Faculty of Science and Engineering Chuo University Japan

This paper first presents robust algorithms to extract invariants of the linear Lie algebra model from 3D objects. In particular, an extended 3D Hough transform is presented to extract accurate estimates of the normal vectors. Least squares fitting is used to find normal vectors and representation matrices. Then a segmentation algorithm for 3D objects is shown using the invariants of linear Lie algebra. Distributions of invariants, both in the invariant space and on the object surface, are used to produce clusters and edge detection.

关键词： Algebra Vectors Shape image recognition image coding image segmentation Chaotic communication Robustness Least squares methods Clustering algorithms

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Improved rank conditioned median filter for removal of impulse noise from images

Improved rank conditioned median filter for removal of impul...

引用

IEEE Region 10 International conference TENCON

作者： K.M. Singh P.K. Bora Department of Electronics and Communication Engineering Indian Institute of Technology Guwahati India

This paper presents an improved rank-conditioned median filter, with the ability of the median filter to remove the impulse noise and the rank conditioned median filter to preserve edges and fine image details. The center pixel that lies outside the trimming range after ranking in the rank-conditioned median algorithm may not be the corrupted pixel, but it may be a pixel on the edge or image detail and therefore, it is further verified if the central sample is a possible candidate for being an impulse by thresholding. The better performance of the new filter is demonstrated.

关键词： Pixel Nonlinear filters Information filtering Information filters Digital filters image processing Computer vision Frequency Digital images Low pass filters

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Stereoscopic visual servo system for microinjection

Stereoscopic visual servo system for microinjection

引用

IEEE Instrumentation and Measurement Technology conference

作者： H. Yamamoto J. Sakiyama Faculty of Education Okayama University Medical School Okayama Japan Faculty of Health Sciences Okayama University Medical School Okayama Japan

In this paper, we describe a visual feedback system using a stereoscopic microscope that controls a micromanipulator so that a needle head may pierce a target with as much length as desired. At first, we developed an image processing algorithm for the tip of the needle head to touch the target. Secondarily, we developed an algorithm for prediction of the tip position of the needle head within the target. By performing a preoperation, the shape of the needle head is preserved as a reference pattern. When the needle head is piercing the target, the shape of the needle head within the target is predicted by pattern matching. Thus, we developed a microinjection system that axially pierces the target. Experimental results show that the proposed system may be useful in micromanipulation such as microinjection to brain areas in neuroanatomy.

关键词： Servomechanisms Microinjection Needles Head Shape Microscopy Control systems Micromanipulators image processing Prediction algorithms

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Adaptive rate control for JPEG2000 image coding in embedded systems

Adaptive rate control for JPEG2000 image coding in embedded ...

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IEEE International conference on image processing

作者： T. Masuzaki H. Tsutsui T. Izumi T. Onoye Y. Nakamura Department of Communications and Computer Engineering Graduate School of Informatics Kyoto University Kyoto Japan

To cope with the recent mobile scenes where images are used aggressively, a novel rate control scheme is proposed. The proposed scheme, dedicated for JPEG2000 image coding, aims at achieving low computational cost and small working memory size while maintaining high image quality. By predicting the adequate number of coding passes and updating it adaptively in code-block coding, the proposed scheme reduces both computational cost and working memory size for bitstream buffering down to 29% and 13%, respectively.

关键词： Programmable control Adaptive control Control systems image coding Embedded system Computational efficiency Bit rate image quality Arithmetic Communication system control

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WaveNet processing brassboards for live video via radio

WaveNet processing brassboards for live video via radio

引用

International Joint conference on Neural Networks (IJCNN)

作者： C. Hsu Trident Systems Inc. Fairfax VA USA

Recent advances in areas of both discrete wavelet transforms (DWT) and continuous wavelet transforms (CWT), representing human visual system neural networks, have resulted in improved video compression, restoration, and filtering techniques. These software techniques are capable of achieving quality performance in video. However, the computational complexity requires specially designed hardware to run real time live video through radio. This hardware, called a brassboard, when integrated with computers, can potentially provide us with many applications including remote sensors, security systems, commercial and home video teleconferencing. This paper describes a low cost board to support a video compression, restoration, and filter system in real time processing. This WaveNet board has been optimized for wavelet-based image and video compression and enhancement techniques.

关键词： Video compression Discrete wavelet transforms Continuous wavelet transforms image restoration Hardware Humans visual system Neural networks Filtering Software performance

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