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Extracting textual inserts from digital videos

Extracting textual inserts from digital videos

引用

International Conference on Document Analysis and Recognition

作者： A. Miene T. Hermes G. Ioannidis A. Christoffers Image Processing Department FB-3 Mathematics and Computer Scienes University of Bremen Bremen Germany

ISBN: (纸本)0769512631

Textual inserts and closed captures superimposed on digital videos often contain important and exclusive information about the video contents which cannot be found in other information channels. Therefore, it is very helpful to extract this information automatically and add it to a video index as generated by video archiving and retrieval systems like e.g. ADViSOR, AVAnTA, DiVA or Informedia. Owing to the fact that common OCR systems are restricted to binary images, the video frames have to be preprocessed in order to extract the textual inserts from the image in the background. In this paper we present our approach to the segmentation of textual inserts from digital videos or images, which consists of a region-growing method for color segmentation and a method of separating text regions from background based on character size and alignment constraints. A new method on segmentation refinement taking into account the results of the classification step leads to a significant enhancement of quality of the resulting binary images. The main difficulties in extracting textual inserts from video are caused by the low resolution and quality of digital video material, the high amount of image data, the very complex structured and textured background, and the unknown color size, and position of the text to be extracted from the image.

关键词： Videos image segmentation Data mining Optical character recognition software Filters Color computers image processing Signal processing

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Evaluation of diffusion techniques for improved vessel visualization and quantification in three-dimensional rotational angiography 4th

引用

4th International Conference on Medical image Computing and computer-Assisted Intervention, MICCAI 2001

作者： Meijering, Erik Niessen, Wiro Weickert, Joachim Viergever, Max Image Sciences Institute University Medical Center Utrecht Heidelberglaan 100 UtrechtNL-3584 CX Netherlands Computer Vision Graphics and Pattern Recognition Group Department of Mathematics and Computer Science University of Mannheim MannheimD-68131 Germany

ISBN: (纸本)3540426973

Three-dimensional rotational angiography (3DRA) is a promising imaging technique which yields high-resolution isotropic 3D images of vascular structures. Raw 3DRA images, however, usually suffer from a high noise level and the presence of other artifacts. For accurate visualization and quantification of vascular anomalies, noise reduction is therefore highly desirable. In this paper we analyze the effects of several linear and nonlinear filtering techniques for that purpose. From the results of in vitro experiments we conclude that edge-enhancing anisotropic diffusion is very suitable for mentioned tasks. However, in view of the computational requirements of this technique, the regularized isotropic nonlinear diffusion scheme may be considered a useful alternative. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Diffusion

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A novel approach for increasing security and data embedding capacity in images for data hiding applications

A novel approach for increasing security and data embedding ...

引用

International Conference on Information Technology: Coding and Computing (ITCC)

作者： F. Alturki R. Mersereau Department of Electrical and Computer Engineering Center of Signal and Image Processing Georgia Institute of Technology Atlanta GA USA

ISBN: (纸本)0769510620

Data hiding in multimedia is the process of secretly embedding information into data sources such as image, video, or audio signals without changing the perceptual quality of the data source. We present a novel blind data hiding technique for hiding information in still images. This technique is based on embedding the information in the transform domain, after decorrelating the samples in the spatial domain. This results in a significant increase in the number of transform coefficients that can be used to transmit the hidden information. The technique is suitable for a variety of data hiding applications such as steganography, data authentication and captioning. The technique achieves a higher and more secure data embedding rate than existing data embedding transform domain techniques developed for these particular applications.

关键词： Data security Data encapsulation Decorrelation Information security Signal processing Copyright protection Steganography Frequency Quantization Application software

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Reconstruction of specular surfaces using polarization imaging

Reconstruction of specular surfaces using polarization imagi...

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Conference on computer Vision and Pattern Recognition (CVPR)

作者： S. Rahmann N. Canterakis Institute for Pattern Recognition and Image Processing Computer Science Department University of Freiburg Freiburg im Breisgau Germany

ISBN: (纸本)0769512720

Traditional intensity imaging does not offer a general approach for the perception of textureless and specular reflecting surfaces. Intensity based methods for shape reconstruction of specular surfaces rely on virtual (i.e. mirrored) features moving over the surface under viewer motion. We present a novel method based on polarization imaging for shape recovery of specular surfaces. This method overcomes the limitations of the intensity based approach because no virtual features are required. It recovers whole surface patches and not only single curves on the surface. The presented solution is general as it is independent of the illumination. The polarization image encodes the projection of the surface normals onto the image and therefore provides constraints on the surface geometry. Taking polarization images from multiple views produces enough constraints to infer the complete surface shape. The reconstruction problem is solved by an optimization scheme where the surface geometry is modelled by a set of hierarchical basis functions. The optimization algorithm proves to be well converging, accurate and noise resistant. The work is substantiated by experiments on synthetic and real data.

关键词： image reconstruction Surface reconstruction Polarization Shape Geometry Surface texture Lighting Solid modeling image converters Multi-stage noise shaping

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Use of FEC coding for real-time transport on ATM networks

Use of FEC coding for real-time transport on ATM networks

引用

IEEE Workshop on High Performance Switching and Routing

作者： R. Kurceren J.W. Modestino Electrical Computer and Systems Engineering Department and Center for Image Processing Research Rensselaer Polytechnic Institute Troy NY USA

ISBN: (纸本)0780367111

The use of forward error-control (FEC) coding has emerged as a promising approach for real-time transport over ATM networks for cell-loss recovery. The use of an FEC-based transport protocol over networks with bandwidth constraints, however, is not obvious since FEC coding introduces an overhead which can possibly cause additional cell losses which, furthermore, tend to occur in bursts. In this work, an overall performance evaluation of FEC coding is provided by incorporating the effects of channel coding on the cell-loss characteristics of the network. It is shown that FEC coding with proper selection of channel coding rate can significantly improve the throughput at a multiplexer even under correlated cell-loss situations. We also develop and illustrate an information-theoretic approach for incorporating the effects of FEC coding into well-established queueing theory calculations. This is achieved by solving separately the channel-coding problem for the modeled transmission channel and the queueing problem for the network. The performance of some specific coding designs are shown to approach the information-theoretic predictions with increasing complexity and/or delay.

关键词： Forward error correction image coding Transport protocols Channel coding Asynchronous transfer mode Systems engineering and theory Bandwidth Throughput Resource management computer networks

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Transport of scalable video over CDMA wireless networks: a joint source coding and power control approach

Transport of scalable video over CDMA wireless networks: a j...

引用

IEEE International Conference on image processing

作者： Yee Sin Chan J.W. Modestino Center for Image Processing Research Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute Troy NY USA

We investigate the transport of scalable digital video over future third-generation (3G) wireless CDMA cellular systems By considering the resource requirements as the aggregate of the products of source coding rates and the energy per information bit to noise ratio, we propose a joint source coding and power control (JSCPC) scheme which simultaneously maximizes the quality of the delivered video while minimizing the total resource consumption. We demonstrate the efficacy of this approach using the ITU-T H.263+ video source coder, although the approach is generally applicable to other source coding schemes as well.

关键词： Multiaccess communication Wireless networks Source coding Power control Video compression Systems engineering and theory Streaming media Silicon compounds image processing Power engineering computing

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Embedded image coding using zeroblocks of subband/wavelet coefficients and context modeling

Embedded image coding using zeroblocks of subband/wavelet co...

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Data Compression Conference (DCC)

作者： Shih-Ta Hsiang Center for Image Processing Research and Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute Troy NY USA

ISBN: (纸本)0769510310

In this paper, we present a new embedded wavelet image coding system using quadtree splitting and context modeling. It features low computational complexity and high compression efficiency, thanks to joint utilization of two powerful embedded coding techniques-set partitioning and context modeling. With effective exploitation of strong statistical dependencies among the quadtree nodes built up from subband coefficients, the proposed algorithm substantially improves the coding efficiency of the existing set-partition coders for both lossy and lossless image compression. For example, our experimental results show that the new algorithm respectively outperforms zerotree-based SPIHT and quadtree-based SPECK by 0.7 dB and 1.0 dB at 0.5 bpp on an average.

关键词： image coding Wavelet coefficients Context modeling Partitioning algorithms Transform coding image processing Embedded computing Power engineering computing Power engineering and energy Systems engineering and theory

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Multi-layered video transmission over wireless channels using an adaptive modulation and coding scheme

Multi-layered video transmission over wireless channels usin...

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IEEE International Conference on image processing

作者： Y. Pei J.W. Modestino Center for Image Processing Research Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute Troy NY USA

In this paper we describe a multi-layered video transport scheme for wireless channels capable of adapting to channel conditions in order to maximize end-to-end quality of service (QoS). This scheme combines a scalable H.263+ video source coder with unequal error protection (UEP) across layers. The UEP is achieved by employing different channel codes together with a multiresolution modulation approach to transport the different priority layers. Adaptivity to channel conditions is provided through use of joint source-channel coding (JSCC) which attempts to jointly optimize the source and channel coding rates together with the modulation parameters to obtain the maximum achievable end-to-end QoS for the prevailing channel conditions. Results indicate that this adaptive JSCC scheme employing scalable video encoding together with a multiresolution modulation/coding approach leads to significant improvements in delivered video quality for specified channel conditions. In particular, the approach results in considerably improved graceful degradation properties for decreasing channel SNR.

关键词： Modulation coding image coding Signal resolution Video coding Quality of service Constellation diagram Systems engineering and theory Error correction codes Channel coding Degradation

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Adaptive hierarchical stereo matching using object segmentation and window warping

Adaptive hierarchical stereo matching using object segmentat...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Jae-Chul Kim Byoung-Ho Kang Maeng-Sub Cho Color Imaging Research Team Image Processing Department Computer and Software Technology Laboratory Electronics and Telecommunications Research Institute Taejon South Korea

In this paper, we propose an adaptive stereo matching algorithm to encompass stereo matching problems in projective distortion region. Since the projective distortion region can not be estimated in terms of fixed-size block matching algorithm, we tried to use adaptive window warping method in hierarchical matching process to compensate the perspective distortions. In addition, probability theory was adopted to encompass uncertainty of disparity of points over the window in this study. The proposed stereo matching algorithm has been tested on both disparity map and 3D model view. The experimental results show that remarkable improvement is obtained in the projective distortion region.

关键词： Object segmentation Optical distortion Uncertainty Cameras Solid modeling Color image processing Laboratories Software algorithms Testing

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Secure blind image steganographic technique using discrete Fourier transformation

Secure blind image steganographic technique using discrete F...

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IEEE International Conference on image processing

作者： F. Alturki R. Mersereau Department of Electronic Engineering College of Technological Studies Shuwaikh Kuwait Center for Signal and Image Processing Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

We present a new steganographic technique for covert communications. The technique embeds the hidden information in the DFT domain after permuting the image pixels in the spatial domain using a key. The permutation process introduces randomness into the cover image and results in a significant increase in the number of transform coefficients that can be used to transmit the hidden information. The hidden information is embedded using a quantization technique. The perceptual and statistical properties of the cover and the stego images remain similar for small quantization steps. The security of the system is examined against known stego attack.

关键词： Steganography Decorrelation Pixel Quantization Information security Cryptography Application software Frequency image converters Educational institutions

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