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Compressed Sensing (CS) is a new approach to signal acquisition that can potentially allow us to design very simple video encoders that can be implemented on mobile devices with limited resources. However, previously proposed CS based video codec either require a conventional video codec or a feedback channel for effective operation, thus increasing the complexity. In this paper, a distributed Compressed...
This paper proposes a unidirectional encoder rate control (ERC) scheme in the interpolation based distributed video coding. As the encoder is complexity constrained, accurate estimation of number of bits to decode each bit plane is indeed difficult at the encoder. In case of under-estimation of the bits, correction of the errors in the decoded bit planes, by utilizing the available information, is...
Distributed video coding (DVC) is an emerging coding paradigm, aiming at low complexity encoders. This paper proposes a new scheme for transform domain Wyner-Ziv (WZ) video codec, where the key and WZ frames are encoded in multiple layers. The layers of the each frame are generated by sub sampling the 4x4 blocks in the spatial domain. After decoding each layer, side information (SI) refinement process...
Distributed video coding (DVC) is an emerging application of distributed source coding (DSC). Since coding complexity is shifted from encoder sides to decoder sides, DVC is appropriate and useful for the environments where low power encoding is allowed. The coding performance of DVC is greatly affected by side information extracted from bi-directional key frames which is enhanced through channel decoding...
In this paper, we propose a secure Wyner-Ziv coding system for surveillance applications. In addition to its low coding complexity, this system allows a simple, selective and multilevel encryption for protecting a wireless transmission. Only authorized decoders can decode the video. By encrypting only a small fraction of the bits, it is possible to prevent unauthorized decoders from correctly decoding...
Among the emerging video coding schemes, the effectual solution for the separate-encoding and joint-decoding architecture is the distributed source coding (DSC). In the DSC-based video system, the side information is available in the Wyner-Ziv (WZ) decoder and video reconstruction. Theoretically, the quality of side information (SI), usually referring to the difference between SI and source, dominates...
The Wyner-Ziv video coding (WZVC) efficiency is highly dependent on the quality of the side information (SI) created at the decoder, typically through motion compensated frame interpolation (MCFI) techniques. Since the decoder only has available some reference decoded frames, SI creation turns out to be a difficult problem in WZVC. In most the MCFI techniques available, the matching criterion used...
To meet the special requirements of resource-limited video sensors in wireless video sensor network (WVSN), low-complexity video encoding technique is highly desired. In distributed multi-view video coding (DMVC) system, multi-view video sources are encoded separately and decoded dependently, so the burden of huge computation is shifted from the encoder side to the decoder side. The generation of...
In distributed video coding, the reference frames are used to generate a side information at the decoder in order to decode the Wyner-Ziv frame. The quality of side information has a strong impact on the coding efficiency of distributed video coding. The estimation of the side information becomes less accurate when the temporal distance between the neighboring reference frames increases or when the...
This paper focuses on side information (SI) refinement in Wyner-Ziv video coding and proposes to exploit the intrinsic property of channel coding for improving the joint decoding performance. In this paper, we propose to use syndrome and information bits from the encoder to help the decoder in refining the SI. We use extrinsic information transfer (EXIT) chart analysis to deduce the mutual information...
On the basis of a non-local means denosing process, a novel progressive side information refinement framework for a transform domain Wyner-Ziv video codec is proposed, where the side information is progressively improved, as the decoding proceeds, by exploring both temporal-spatial similarities and already decoded DCT bands. Simulation results show up to 2.5dB in RD performance gain against that of...
We propose an implementation of steganography embedding secret information without degradation of the data quality or increase of data size using Huffman coding. When general digital data are compressed using Huffman coding, the alphabet and the symbol frequency of the source depend on the data. In many cases, the statistics of the data are investigated and code table optimized for the data is constructed...
Single view distributed video coding (DVC) is a coding method that allows for the computational complexity of the system to be shifted from the encoder to the decoder. This property promotes the use of DVC in systems where processing power or energy use at the encoder is constrained. Examples include wireless devices and surveillance. This paper extends on a previously proposed multi-hypothesis non-binary...
We consider the problem of source coding with side information (SI) at the decoder only, when the joint distribution between the source and the SI is not perfectly known. Four parametric models for this joint distribution are considered, where uncertainty about the distribution is turned into uncertainty about the value of the parameters. More precisely, a prior distribution for the parameters may...
The problem of sending two Gaussian sources over the Gaussian multiple access channel (MAC) with bandwidth expansion is studied. In this problem, two distributed transmitters desire to describe the two Gaussian sources to a common receiver subject to desired communication quality requirements and bandwidth expansion constraint. Of our interests is the minimum power and the transmission schemes to...
Distributed Video Coding (DVC) is a relatively new video coding paradigm evolved for catering to emerging applications such as wireless video surveillance and streaming. DVC is not yet commercially deployed due to various challenges including necessity of feedback channel, unavailability of standardized complete coding method including chroma components handling, lower Rate Distortion (RD) performance...
In this paper, we present a method for creating LDPC codes which are specifically designed to be hardware friendly. Our method involves constraining the cyclic shift values in the base H-matrix to reduce the complexity of the cyclic shift hardware. We show that the decoder hardware implementation for these codes has higher throughput and lower power consumption than decoders designed for traditional...
Wyner-Ziv video coding is a new paradigm in video coding based on Slepian-Wolf and Wyner-Ziv theorem. Not like standard video codec, Wyner-Ziv video coding estimates motion in decoder in order to simplify encoder. Among many motion estimation methods that already applied, Expectation-Maximization algorithm is the most effective one. This motion estimation algorithm is block based, where all pixels...
Distributed Video Coding (DVC) is a coding paradigm which shifts the major computational intensive tasks from the encoder to the decoder. Temporal correlation is exploited at the decoder by predicting the Wyner-Ziv (WZ) frames from the adjacent key frames. Compression is then achieved by transmitting just the parity information required to correct the predicted frame and recover the original frame...
The paper describes an application for displaying advertisements in between switching of TV channels. The device for reception and playback of digital television signal receives such signal and processes it further. On some channels, within the received signal, multimedia advertising content is present (eg. pictures or short video messages). Advertisements are displayed conditionally on user's TV...
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