Search results for: R.L. Lagendijk

Items from 1 to 11 out of 11 results

chapter

Rate distortion optimal contour compression using cubic B-splines

J. Zaletelj, R. Pecci, F. Spaan, A. Hanjalic, more

9th European Signal Processing Conference (EUSIPCO 1998) > 1 - 4

9th European Signal Processing Conference (EUSIPCO 1998)

Object contours resulting from segmenting images or video frames can be efficiently encoded using B-spline functions. An unsolved problem is how to divide a given contour into segments such that the resulting compression is optimal in rate-distortion sense. In this paper we describe two techniques for finding a close-to-optimal knot assignment. The first technique prunes an accurate B-splines approximation...

chapter

Privacy-preserving user clustering in a social network

Z. Erkin, T. Veugen, T. Toft, R.L. Lagendijk

2009 First IEEE International Workshop on Information Forensics and Security (WIFS) > 96 - 100

2009 First IEEE International Workshop on Information Forensics and Security (WIFS 2009)

In a ubiquitously connected world, social networks are playing an important role on the Internet by allowing users to find groups of people with similar interests. The data needed to construct such networks may be considered sensitive personal information by the users, which raises privacy concerns. The problem of building social networks while user privacy is protected is hence crucial for further...

chapter

Analysis of performance losses in Distributed Video Coding

S. Borchert, R.P. Westerlaken, R.K. Gunnewiek, R.L. Lagendijk

2009 Picture Coding Symposium > 1 - 4

2009 Picture Coding Symposium (PCS)

In this paper we analyze the substantial performance gap between distributed video coding (DVC) and well known state-of-the-art coders. We take a modular approach towards analyzing the performance loss in DVC and investigate 3 key components. These are quantization, bit stream generation and motion estimation. Their respective contributions to the total performance loss varies with the video properties...

chapter

Motion compensated prediction in transform domain Distributed Video Coding

S. Borchert, R.P. Westerlaken, R.K. Gunnewiek, R.L. Lagendijk

2008 IEEE 10th Workshop on Multimedia Signal Processing > 332 - 336

2008 IEEE 10th Workshop on Multimedia Signal Processing (MMSP)

The ongoing research in distributed video coding (DVC) for low complexity encoding is trying to shorten the substantial performance gap to well known state-of-the-art coders. One way of reducing this gap is to improve the quality of the motion compensated prediction. In this paper we investigate which motion estimation method to apply in DVC, comparing possible methods to produce a motion compensated...

article

Distortion Estimation in Compressed Music Using Only Audio Fingerprints

P.J.O. Doets, R.L. Lagendijk

IEEE Transactions on Audio, Speech, and Language Processing > 2008 > 16 > 2 > 302 - 317

An audio fingerprint is a compact yet very robust representation of the perceptually relevant parts of an audio signal. It can be used for content-based audio identification, even when the audio is severely distorted. Audio compression changes the fingerprint slightly. We show that these small fingerprint differences due to compression can be used to estimate the signal-to-noise ratio (SNR) of the...

chapter

Subjective Quality Analysis of Bit Rate Exchange Between Temporal and SNR Scalability in the MPEG4 SVC Extension

M.A.J. Barzilay, J.R. Taal, R.L. Lagendijk

2007 IEEE International Conference on Image Processing > 2 > II - 285 - II - 288

2007 IEEE International Conference on Image Processing, ICIP 2007

It is well known that a compression trade-off exists between the spatial and temporal video quality. Various temporal scalability techniques have been considered for lowering the encoded frame rate such that the freed bit rate can be used to increase the PSNR quality of the remaining frames. Temporal scalability in the SVC extension of the MPEG4/AVC codec [1] is realized by the hierarchical B-frame...

article

Probabilistic Confidence Measures for Block Matching Motion Estimation

I. Patras, E.A. Hendriks, R.L. Lagendijk

IEEE Transactions on Circuits and Systems for Video Technology > 2007 > 17 > 8 > 988 - 995

This paper addresses the problem of deriving measures that express the degree of the reliability of motion vectors estimated by a block-matching motion estimation method. We express the block matching motion estimation scheme in the probabilistic framework as a maximum-likelihood estimation scheme. Subsequently, we derive the confidence measures in terms of the a posteriori probabilities and the likelihoods...

article

Advances in Digital Video Content Protection

E.I. Lin, A.M. Eskicioglu, R.L. Lagendijk, E.J. Delp

Proceedings of the IEEE > 2005 > 93 > 1 > 171 - 183

The use of digital video offers immense opportunities for creators; however, the ability for anyone to make perfect copies and the ease by which those copies can be distributed also facilitate misuse, illegal copying and distribution ("piracy"), plagiarism, and misappropriation. Popular Internet software based on a peer-to-peer architecture has been used to share copyrighted movies, music,...

article

Video segmentation by MAP labeling of watershed segments

I. Patras, E.A. Hendriks, R.L. Lagendijk

IEEE Transactions on Pattern Analysis and Machine Intelligence > 2001 > 23 > 3 > 326 - 332

This paper addresses the problem of spatio-temporal segmentation of video sequences. An initial intensity segmentation method (watershed segmentation) provides a number of initial segments which are subsequently labeled, with a known number of labels, according to motion information. The label field is modeled as a Markov random field where the statistical spatial and and temporal interactions are...

chapter

Compatible HDTV transmission using conditional entropy coding

F. Bosveld, R.L. Lagendijk, J. Biemond

1993 IEEE International Conference on Acoustics, Speech, and Signal Processing > 5 > 674 - 677 vol.5

Proceedings of ICASSP '93

The authors thoroughly investigate the performance of multistage scalar quantization and investigate three encoding strategies: concatenated coding, conditional entropy coding, and conditional uniform quantization. It is shown that the coding performance of a multistage quantized subband is inferior to that of direct (i.e., single stage) quantization. Conditional entropy coding and conditional uniform...

chapter

Noise reduction of severely corrupted image sequences

R.P. Kleihorst, R.L. Lagendijk, J. Biemond

1993 IEEE International Conference on Acoustics, Speech, and Signal Processing > 5 > 293 - 296 vol.5

Proceedings of ICASSP '93

A nonlinear adaptive noise filter for filtering the nonstationary signals from image sequences is presented. The filter uses estimates of the local statistics to adapt instantaneously. The authors propose to use a robust recursive estimator for those statistics which is based on order statistics. Prior to filtering, motion is estimated from the sequence and compensated for. For the estimation, a recursive...

INFONA - science communication portal

Search results for: R.L. Lagendijk

Rate distortion optimal contour compression using cubic B-splines

Privacy-preserving user clustering in a social network

Analysis of performance losses in Distributed Video Coding

Motion compensated prediction in transform domain Distributed Video Coding

Distortion Estimation in Compressed Music Using Only Audio Fingerprints

Subjective Quality Analysis of Bit Rate Exchange Between Temporal and SNR Scalability in the MPEG4 SVC Extension

Probabilistic Confidence Measures for Block Matching Motion Estimation

Advances in Digital Video Content Protection

Video segmentation by MAP labeling of watershed segments

Compatible HDTV transmission using conditional entropy coding

Noise reduction of severely corrupted image sequences

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