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Distributed video coding is the promising solution for emerging applications such as wireless video surveillance, wireless video sensor networks that have not been supported by traditional video coding standards. Success of distributed video coding is based on exploiting the source statistics at the decoder with availability of some side information. The better the quality of side information, the...
Although High Dynamic Range (HDR) content can provide an enhanced immersive experience for end-users, the impact of channel errors on its perception is unclear due to the lack of a standardized HDR video distribution framework. This paper presents an assessment of the robustness of the two main HDR video distribution architectures, the single-layer 10-bit scheme and the two-layer 8-bit backward-compatible...
One challenge in a video surveillance system is the data rate required to represent digital video. Accordingly, the use of lossy video compression at a compression ratio of 100:1, or higher, is an essential part of any distributed live video system. The ensuing distortion can interfere with the goals of surveillance by confounding both human analysis and computer vision based processing. This paper...
Scalable video coding offers a large choice of configurations when decoding a compressed video. A single encoded bitstream can be decoded in multiple modes, from a full video quality mode to different degraded video quality modes. In the bitstream, data is separated into layers, each layer containing the information relative to a quality level and depending on information from other layers. In the...
Compressed Sensing(CS) based video coding techniques are low-complexity in general, but with marginal compression results. Also, wireless multimedia devices have serious resource constraints, with fluctuations in bandwidth(for up-link traffic) and available power. In this paper we propose a nested technique in which CS data is further compressed within the CS domain to give far better compression...
This paper describes an adaptive deblocking postfilter based on neural networks for use in H.265 High Efficiency Video Coding (HEVC). Blocking noise is a common problem in video coding caused by the division of the frame into blocks. The filter is adaptive because it uses different filter parameters depending on block characteristics. We use a modified HEVC decoder to export the block information...
To increase the overall visual quality of the video services without increasing data rate, we developed an unequal protection technique called UEP3D (Unequal Error Protection 3D) based on a hierarchy of the video stream in different levels of importance,. The determination of levels of importance takes three classification criteria: pixel level, macroblock level and image level. At the end of the...
We propose an algorithm that accomplishes transform-coded, spatiotemporal, pel-recursive video compression. Traditional pel-recursive coders obtain sophisticated spatio-temporal predictions for the current pixel based on previously decoded data. The resulting per-pixel prediction errors are encoded independently so that the decoder can use previously-encoded pixels in the prediction of the current...
In the absence of a commercial High Dynamic Range (HDR) distribution pipeline, two-layer backward-compatible HDR video coding is a viable solution for the imminent transition from Low Dynamic Range (LDR) to HDR content transmission. However, the performance of a two-layer coding solution is governed by the extension layer coding performance. In this paper, we propose an improved two-layer backward-compatible...
A recent video coding standard, called High Efficiency Video Coding (HEVC), adopts two in-loop filters for coding efficiency improvement where the in-loop filtering is done by a de-blocking filter (DF) followed by sample adaptive offset (SAO) filtering. The DF helps improve both coding efficiency and subjective quality without signaling any bit to decoder sides while SAO filtering corrects the quantization...
The latest High Efficiency Video Coding (HEVC) standard significantly improves coding efficiency over H.264/AVC, at the cost of heavy encoding and decoding complexity. For reducing HEVC decoding complexity to a target, we propose in this paper a Subjective-Quality-Optimized Complexity Control (SQOCC) approach, which optimizes subjective quality loss caused by the decoding complexity reduction. First,...
Error resilience (ER) is an important tool in video coding to maximize the quality of Experience (QoE). The prediction process in video coding became complex which yields an unsatisfying video quality when NALunit packets are lost in error-prone channels. There are different ER techniques and multiple description coding (MDC) is one of the promising technique for this problem. MDC is categorized into...
In this paper, we propose a method for distributed compressed video sensing (DCVS) based on dictionary learning. The proposed method divides the video sequences into group of pictures (GOP). Each GOP includes a key-frame following by a CS-frame. Compressed sensing (CS) is used to exploit spatial redundancy of frames. At the encoder side Key-frames are sampled using random projection methods. To acquire...
High Efficiency Video Coding (HEVC) is gradually replacing its predecessor, the H.264/AVC standard, as the state-of-the-art technology for video compression. However, H.264/AVC has dominated the market for over a decade, so that there is an enormous amount of legacy content that must be migrated. This paper proposes a fast transcoder based on an extensive data mining process on H.264/AVC decoding...
In a distributed video coding problem, use of a correct model for the correlation noise plays a significant role in improving the decoding performance and consequently in providing higher coding efficiency. In this work, we first study the predictive and additive correlation noise models at the DCT coefficient band level for transform-domain distributed video coding. Then, bounds on compression rates...
Selective encryption approaches for efficient multimedia content protection is proposed in wireless multimedia sensor networks (WMSNs) by many authors. Apart from these methodologies, the other important aspect which is discussed in some literatures is the combined optimization of multimedia quality, content protection and energy issues pertaining to communication. However in these joint optimization...
In this information age, a efficient video encoding/decoding technology will help reducing information redundancy, delaying processing, enhancing the robustness, improving visual perception of quality, increasing the compression ratio, etc. At first, this article describes the history of video encoding/decoding standards development. Research on the key technologies of H.264 coding standard currently...
Motivated by the correlation channel modeling problem in practical applications, such as distributed video coding, we study the binary source coding of a uniform source with side information, under asymmetric correlation channel assumptions. First, we consider the case where side information is available to both the encoder and decoder, and give an analytical formula for the rate-distortion bound...
This paper presents a method for efficient compression of high dynamic range (HDR) and wide color gamut (WCG) video data. The proposed solution consists of two major elements: a conventional video codec (e.g., HEVC) and pre-and post-processing steps applied prior to encoding and after decoding process, respectively. The proposed HDR/WCG video coding system can be configured to provide two configurations:...
An efficient framework of distributed compressive video coding using Enhanced side information for WSN is proposed. At the encoder, the incoming video frames are split into key frames and Wiener-Ziv (WZ) frames depending on Group of Picture (GOP). Based on Distributed Video Coding (DVC) these frames are processed independently and transmitted over WSN. Generally the WZ frames are encoded at a lower...
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