Distributed video coding thesis

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The combination of transform domain jointly with TTCM codes have never been proposed in the literature before and it outperforms some of the related architectures of the state of the art.

Only limited memory and power are available at the encoder for these applications, while the decoder has access to more powerful computational resources. Girod, Wyner-Ziv coding of multiview images with unsupervised learning of two disparities, Proc.

This is not suitable for some emerging applications such as wireless sensor networks, where the encoders usually have limited functionalities and power supplies, therefore it is desired to shift the bulk of computational burden to the decoder side.

Mobility is one of the most distinct features to be considered in a wireless network. We refer to these backward predictive coded frames as BP frames. The compression efficiency is comparable to conventional predictive coding systems.

Hence, it is difficult to find an accurate model for the correlation noise and estimate its parameters precisely at the decoder. Girod, Network image coding for multicast, Proc.

Motivated by its potential applications in distributed sensor networks, video coding, and compressing multi-spectral imagery, there has been a flurry of recent research activities on distributed source coding.

Rate Control Techniques for H. Finally, a novel approach for Wyner-Ziv to H. The proposed scheme has a better rate-distortion performance than the separate H.

Another problem of concern is that, since side information frame is generated in the decoder using the temporal interpolation between the previously decoded frames, the quality of the side information frames is generally poor when the motions between the frames are non-linear.

We further consider the scenario when there are transmission errors and delays over the backward channel. Its influence has diversified in context and deepened to a level of indispensability. Finally, we compare the derived solutions for each DVC aspect with its counterpart in conventional video coding.

Hence, generating a high-quality side information is a challenging problem. The research scope of this thesis covers a number of design aspects of Wyner-Ziv coding, making significant contributions towards building a practical video codec in view of commercial developments and standardization.

Girod, Image authentication and tampering localization using distributed source coding, Proc. Extensive simulations are carried out showing that the proposed decoder leads to an improved rate-distortion performance in comparison to the original DISCOVER codec and in another DVC codec employing side information frame refinement, particularly for video sequences with high motion content.

The feedback free architecture, one of the pioneering unidirectional frameworks is presented in this thesis, which enables the suppression of practically hindering reverse feedback channel. In the second part of this work, a new algorithm for the generation of the side information is proposed to refine the initial side information frame using the additional information obtained after decoding the previous DCT bands of a Wyner-Ziv frame.

In this dissertation, we focus on designing decoder-side learning schemes for better understanding of the source statistics, based on which practical DSC systems can be built for high-efficiency, low-cost, and secure multimedia communications.

However, for a less constrained encoder complexity conventional inter coding outperforms DVC by a large margin. Girod, Image authentication based on distributed source coding, Proc.

Hence the encoder requires much more computational resources than the decoder. The main goal of our work is to generate at the decoder the side information that optimally blends temporal and interview data.

We propose to enable partial access to the current source through progressive decoding, such that the decoder's knowledge about the source statistics can be progressively refined.

Distributed Video Coding Thesis

DVC approach can be very interesting when dealing with 3D video source both for stereoscopic video sequence and multi-view video sequence because it allows to design a simple encoder shifting all the computational complexity to the decoder. Modeling and Algorithms, July Watermarking and Steganography, March In this thesis, we combine encryption and distributed video source coding to consider the choices of which types of bits are most effective for selective encryption of a video sequence that has been compressed using a distributed source coding method based on LDPC and Turbo codes.

For DSC of real-world sources such as images and videos, such knowledge is not really available. The group key management scheme uses a pre-positioned secret sharing scheme. Finally, image retrieval techniques in multimedia database are reported.

Progressive Compression of 3-D Graphics, May An optimal stream encoding order algorithm is designed to enable the encoder to automatically decide the stream encoding order and find the best reference streams.

Three estimators, the minimum estimator, the median estimator and the average estimator, are proposed and the complexity-rate-distortion analysis is presented. In this dissertation, we design a key management tree such that neighbors on the key tree are also physical neighbors on the cellular network.

Finally, it is shown that incorporating the proposed algorithm for refining the side information into the decoder proposed in the first part of the thesis leads to a further improvement in the rate-distortion performance of the DVC codec.

Advanced Distributed Video Coding Techniques

This new video coding paradigm allows exploiting the source statistic, partially or totally, at the decoder only. The improvements done over the reference video transcoder make that the time delay and complexity constraints of the end user devices are not any restrictions.

In channel coding, we investigate decoder-based modeling. Girod, Wyner-Ziv coding of stereo images with unsupervised learning of disparity, Proc. In some cases (say, distributed video coding), it was because the technology was impractical for the prevalent use case.

In most other cases, however, it is likely that not enough resources were invested in the new technology to allow for maturity.

Alumni – PhDs

Reuben Farrugia. Publications Teaching Ongoing Projects Past Projects Publications Code/Data "Improving Decoding Speed for Parallel Distributed Video Coding Architectures," in European Signal Processing Conference, Sep.Marrakech, Morocco Thesis. R.A. Farrugia. Motion estimation and DCT quantization in low complexity video compression Proefschrift Distributed Video Coding (DVC): Motion estimation and DCT quantization in low complexity video compression.

coding This thesis deals with an alternative method of ignoring the motion at the encoder. C.

HKUST Institutional Repository

Brites, “ Exploiting Correlation Noise Modeling in Wyner-Ziv Video Coding ”, Ph.D. Thesis, Instituto Superior Técnico, Technical University of Lisbon, Lisbon, Portugal, Wyner-Ziv (WZ) video coding is a particular case of distributed video coding, a new video coding paradigm based on the Slepian-Wolf [1] and Wyner-Ziv [2] theorems which mainly exploit the source correlation at the.

A distributed video coding (DVC) system based on wavelet transform and set partition coding (SPC) is presented in this paper. Conventionally the significance map (sig-map) of SPC is not conducive to Slepian–Wolf (SW) coding, because of the difficulty of generating a side information sig-map and the sensitivity to decoding errors.

"December "Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Electrical and Computer winforlifestats.combuted coding is a new paradigm for video transmission, based on the Wyner-Ziv theorem.

Distributed video coding thesis
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USC Media Communications Lab – Alumni – PhDs