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Adaptive image compression using sparse dictionaries

Adaptive image compression using sparse dictionaries

引用

2012 19th International Conference on Systems, signals and image processing, IWSSIP 2012

作者： Horev, Inbal Bryt, Ori Rubinstein, Ron Signal and Image Processing Lab. Department of Electrical Engineering Technion Haifa Israel Geometric Image Processing Lab. Department of Computer Science Technion Haifa Israel

ISBN: (纸本)9783200023284

Transform coding is a widely used image compression technique, where entropy reduction can be achieved by decomposing the image over a dictionary which provides compaction. Existing algorithms, such as JPEG and JPEG2000, utilize fixed dictionaries which are shared by the encoder and decoder. Recently, works utilizing content-specific dictionaries show promising results by focusing on specific classes of images and using highly specialized dictionaries. However, such approaches lose the ability to compress arbitrary images. In this paper we propose an input-adaptive compression approach, which encodes each input image over a dictionary specifically trained for it. The scheme is based on the sparse dictionary structure, whose compact representation allows relatively low-cost transmission of the dictionary along with the compressed data. In this way, the process achieves both adaptivity and generality. Our results show that although this method involves transmitting the dictionary, it remains competitive with the JPEG and JPEG2000 algorithms. © 2012 Institute of Telecommunica.

关键词： image compression

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Lens-motor noise suppression for digital cameras

Lens-motor noise suppression for digital cameras

引用

2008 IEEE 25th Convention of Electrical and Electronics Engineers in Israel, IEEEI 2008

作者： Barazany, Avihay Levy, Royi Avargel, Yekutiel Signal and Image Processing Lab. Department of Electrical Engineering Technion - Israel Institute of Technology Technion City Haifa 3200 Israel

ISBN: (纸本)9781424424825

In this paper, we formulate a speech enhancement problem under multiple hypotheses, assuming an indicator for the lens motor noise presence is availab.e in the time domain. This approach is largely based on an existing speech enhancement algorithm [3], and was adapted to specifically handle lens motor noises. Hypothetical presence of speech together with an estimation of the stationary noise and the lens motor noise, are considered in the calculation of the desired signal spectral coefficients. Cost parameters control the trade-off between speech distortion and residual transient noise. An optimal estimator, which minimizes the mean-square error of the log-spectral amplitude, is derived, while taking into account the probability of erroneous detection. Experimental results demonstrate a substantial suppression of the motor noise with a minimal degrade to the perceived quality of the desired signal. © 2008 IEEE.

关键词： Spectrum analysis

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Post-processing for flicker reduction in H. 264/AVC

Post-processing for flicker reduction in H. 264/AVC

引用

26th Picture Coding Symposium, PCS 2007

作者： Kuszpet, Yair Kletsel, Dimitry Moshe, Yair Levy, Avi Signal and Image Processing Lab. Department of Electrical Engineering Technion - IIT Israel Intel Corporation United States

ISBN: (纸本)9789898109057

The H. 264/AVC standard mitigates some of the most noticeable artifacts of former video coding standards, such as blocking and ringing. However, it exhibits a new temporal artifact, not prevalent in these standards: a noticeable discontinuity between an intra frame and its preceding inter frame, known as flicker. This paper proposes a post-processing scheme for dealing with the flicker artifact. A motion compensated version of the intra frame is generated based on its preceding inter frame, and is used to filter the intra frame in order to reduce the discontinuity. In addition, a non-reference flicker measure is proposed, and is used as a basis for an adaptive flicker-reduction technique. Objective results, as well as subjective impressions, indicate that the proposed method significantly reduces the discontinuity, with an almost negligible drop in PSNR.

关键词： image coding

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Robust and efficient change detection algorithm based on 3D line segments

Robust and efficient change detection algorithm based on 3D ...

引用

2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel, IEEEI 2012

作者： Zohar, Tom Ariav, Ido Bar-Zohar, Meir Signal and Image Processing Lab. Department. of Electrical Engineering Technion Israel Institute of Technology Haifa 32000 Israel

ISBN: (纸本)9781467346801

In this paper we examine and improve a new approach for change detection (introduced in [1]) which is based on the appearance and disappearance of 3D line segments as seen in a new image. These 3D line segments are estimated from a set of learning images taken from arbitrary viewpoints and under arbitrary light conditions in an unsupervised manner. The main advantage of the proposed method lies in the fact that the change detection is performed by comparing line segments, and not surfaces or gray levels. Computing 3D surfaces in an image can be computationally intensive, and other methods such as image subtraction or cross-correlation are sensitive to lighting conditions and changes in viewpoints. Moreover, most man-made objects such as buildings, cars, and even cities viewed from above consist mainly of straight lines, and therefore this method is highly applicable for such structures. The proposed algorithm first focuses on the reconstruction of a set of 3D line segments forming a certain 3D scene using a set of 2D line segments obtained from the learning images in an unsupervised manner, without any prior knowledge on the cameras' positions or relative distance. In the change detection stage, we use the reconstructed 3D scene of line segments to check if changes, such as appearance or disappearance of objects, have occurred in a given test image. This test image can be taken from arbitrary viewpoint and under arbitrary lighting conditions. Our change detection algorithm not only distinguishes between the states of 'changed' and 'not-changed' line segments, it also classifies the 'changed' line segments as appeared - objects that entered the scene in the test image, and disappeared - objects that left the 3D scene reconstructed from the lines of the learning images. © 2012 IEEE.

关键词： Three dimensional computer graphics

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Two new algorithms for fast computation of Legendre moments

Two new algorithms for fast computation of Legendre moments

引用

Visual Communications and image processing 2003

作者： Qin, Lei Shu, Huazhong Jin, Fenghua Toumoulin, Christine Luo, Limin Lab. of Image Science and Technology Southeast University Nanjing 210096 China Lab. of Signal and Image Processing University of Rennes I Rennes 35042 France

Orthogonal moments have been successfully used in the field of pattern recognition and image analysis. However, due to the complexity in their calculation, the problem of fast computation of orthogonal moments has not till now been well solved. This paper presents two fast and efficient algorithms for the two dimensional (2D) Legendre moment computation. They are based on a block representation of the image and respectively use cumulative and integral methods. Results on 2D binary images show that these algorithms can decrease the computational complexity in a very important way.

关键词： image processing

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Estimation of visual ERP signals with nonextensive entropy

Estimation of visual ERP signals with nonextensive entropy

引用

ICBPE 2006 - 2006 International Conference on Biomedical and Pharmaceutical Engineering

作者： Minfen, Shen Bin, Li Hongrong, Tang Key Lab. of Digital Signal and Image Processing of Guangdong Province Shantou University Shantou China

ISBN: (纸本)8190426249

Nonextensive entropy, the Tsallis-like time-dependent entropy (TDE), is developed to study the event-related potential signals ( ERPs ) in a cue, "E"-orientation discrimination task. The statistical characteristics of the TDE for different signal distributions are studied. Results indicated that with the appearance of P2 and N2, a significant decrease of TDE was correlated with the responses to small size cue which supports the previous theoretic analysis. This method provides a novel quantitative measurement for ERPs actives and may be a useful tool in signals monitoring. © 2006 Research Publishing Services.

关键词： Entropy

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Performances in multitarget tracking for convoy detection over real GMTI data

Performances in multitarget tracking for convoy detection ov...

引用

作者： Pollard, Evangeline Pannetier, Benjamin Rombaut, Michèle Information Processing and Modeling Department ONERA Chatillon France Image and Signal Department GIPSA-lab. Grenoble France

ISBN: (纸本)9780982443811

A convoy is defined as a group of vehicles traveling together for mutual support and protection. It constitutes an object of high military interest in the context of the situation assessment. However, it is a challenging task to track and evaluate because convoy targets are very close of each other. In this view, the Onera recently developed a new two step convoy detection process. The first is an original tracking algorithm appropriate for Ground Moving Target Indicator (GMTI) data based on the hybridization of two classical multitarget tracking algorithms, and adapted to closely spaced target tracking. Then, by using algorithm outputs and other data, vehicle aggregates are detected and their characteristics are introduced into a Dynamic Bayesian Network (DBN) which processes the probability for an aggregate to be a convoy. This process gives encourageous results with simulated data. In this paper, we validate this process by showing real data results.

关键词： Aggregates

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An adaptive coding scheme using affine motion model for MPEG P-VOP

An adaptive coding scheme using affine motion model for MPEG...

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Proceedings - IEEE International Conference on Acoustics, Speech, and signal processing

作者： Li, Xiaohuan Jackson, Joel R. Katsaggelos, Aggelos K. Mersereau, Russell M. Ctr. for Image and Signal Processing Georgia Institute of Technology Atlanta GA United States Image and Video Processing Lab. Northwestern University Evanston IL United States

Block matching has been used for motion estimation and motion compensation in MPEG standards for years. While it has an acceptable performance in describing motion between frames, it requires quite a few bits to represent the motion vectors. In certain circumstances, the use of whole frame affine motion models would perform equally well or even better than block matching in terms of motion accuracy, while it results in the coding of only 6 parameters. In this paper, we modify an MPEG-4 codec by adding (1) 6 affine model parameters to the frame header, (2) mode selection among INTRA, SKIP, INTER-16×16, INTER-8×8, and GLOBAL-AFFINE modes by Lagrange optimal rate-distortion criteria. Simulation results demonstrate 10-20% decrease in bit-rate, compared to the MMS' codec for an average coded P-frame with the same reconstruction PSNR.

关键词： Motion estimation

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Analysis of communication systems using iterative methods based on Banach's contraction principle

Analysis of communication systems using iterative methods ba...

引用

2007 6th International Conference on Information, Communications and signal processing, ICICS

作者： Azari Soufiani, H. Saberian, M.J. Akhaee, M.A. Nasiri Mahallati, R. Marvasti, F. Multimedia Signal Sound and Image Processing Lab. Advanced Communications Research Institute of Sharif University of Technology Tehran Iran

ISBN: (纸本)1424409837

In this paper, the application of a well known mathematical theorem, Banach's fixed point theorem [1], is investigated in iterative signal processing in communications. In most practical communication systems some sort of a contraction mapping is used to enhance the operation of the system. Thus, using a suitable iterative approach, one can set the system in its fixed point and hence, the distortion produced in the transmitter, channel and the receiver can be compensated. In other words, a loosely designed transceiver can be enhanced by an iterative method. In order to verify the truth of the proposed iterative method, the distortion of A/D and D/A converters is compensated at the receiver. Although analyses are performed on a linear system, they could be generalized to non linear ones. ©2007 IEEE.

关键词： Iterative methods

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Underwater video streaming using adaptive frame decimation

Underwater video streaming using adaptive frame decimation

引用

OCEANS - Europe

作者： Gilad Avrashi Shlomi Museri Yaakov Bucris Azriel Sinai Alon Amar Signal and Image Processing Lab. Technion Haifa Israel Signal Processing Department Acoustics Research Center Rafael Haifa Israel

We introduce a low data rate video compression scheme for underwater acoustic communication. Recently, multi-carrier based underwater acoustic modems have been proposed and tested for data rates of up to tens of kilobits-per-second for about 1-4 kilometers transmission range. Online transmission of video data using these rates requires extreme compression. Herein, we propose pre-encoder and post-decoder processing in order to reduce the data rate. This is done by exploiting the characteristics of underwater videos for excluding frames. The algorithm was tested and analyzed in simulation environment with several video samples taken by divers in shallow waters of the Mediterranean. We show that using this technique, increased performance is achieved compared to standard H.264/AVC based codecs in both objective and subjective terms.

关键词： Streaming media PSNR image edge detection Video coding Vectors Video compression Codecs

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