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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...
Real-time video applications, such as multi party video conferencing, involve the simultaneous transport of multiple and potentially multi-layered video sources to participating or interested parties. It is desirable to mix these multiple source videos into a single video stream at intermediary nodes in the network, e.g. at Multipoint Control Units (MCU). This has the advantage of reduced application...
An LDPC-coded BICM-ID scheme with nonuniform signaling (NS) for 9-QAM and 12-QAM is proposed, which is designed by mapping Huffman code onto constellations. We demonstrate that proposed NS scheme outperforms LDPC-coded 8-QAM by 0.8 dB.
Brain Computer Interfaces (BCIs) assist individuals with motor disabilities by enabling them to control prosthetic devices with their neural activity. Performance of closed-loop BCI systems can be improved by using design strategies that leverage structured and task-relevant neural activity. We use data from high density electrocorticography (ECoG) grids implanted in three subjects to study sensory-motor...
Multimedia content is now routinely distributed between devices across global networks. These devices differ in their video rendering capability in terms of frame rate, quality, and spatial resolution. To facilitate content exchange between such devices it is necessary to transcode the video format; otherwise no exchange can take place. To prolong battery life on mobile devices, transcoding may take...
The explosive demand for live video streaming over wireless networks is constantly calling for innovations in both video coding and wireless communities. The state-of-the-art answer to this challenge are sliding-window-based Delay-Aware Fountain (DAF) codes, which combine the channel-adaptive feature in rateless coding and the delay-aware feature in video coding. However, a high computational cost...
Due to recent demand for playback of high quality video on mobile devices, there is the need for a scalable, error resilient framework with the ability to adjust to the network and receiver's specification. To cope with the bandwidth fluctuations in the network, the framework's scalability allows for high bit-rate video to be transcoded to a low bit-rate format while preserving quality as much as...
Speech is one of the natural ways of communication amongst humans. Nowadays there is insatiable demand for speech communication as it carries more information like speaker identity, emotional state, prosodic nuance which adds naturalness in communication. With rapid growth and increased number of applications there exists a need for devising an approach for data compression techniques which reduces...
Dynamic texture motions like flowing water, motion of leaves etc. have a complex random character. A sequence containing such a content is challenging to encode even when using state of the art High Efficiency Video Coding (HEVC) especially, if the available bandwidth is limited. It is observed that often when predicting dynamic textures, codec switches to intra prediction. At lower rates, dynamic...
Finding the best possible encoding decisions for compressing a video sequence is a highly complex problem. In this work, we propose a multi-objective Design Space Exploration (DSE) method to automatically find HEVC encoder implementations that are optimized for several different criteria. The DSE shall optimize the coding mode evaluation order of the mode decision process and jointly explore early...
Virtual reality (VR) provides unprecedented immersive experience using high-resolution spherical stereoscopic panoramic video. Such an experience is achieved by using head-mounted display (HMD) which has very strict latency bounds in order to respond promptly to user movements. Conventional streaming of VR video requires large bandwidth because the entire captured panorama is transmitted. However,...
High-dynamic-range (HDR) technology allows capturing of video content at a wider range of luminance than low-dynamic-range (LDR) video. The resulting video more closely resembles the scene as perceived by the human eye. However, displays currently support only a limited range of HDR. Therefore, both an HDR version and LDR version of a video should be encoded during content acquisition. This means...
This paper proposes an adaptive scan order of intra prediction on High Efficiency Video Coding (HEVC). In HEVC, prediction, transformation and quantization are applied in a z-scan order consistently. The proposed method modifies the z-scan order when intra prediction direction is set to from top-right to bottom-left or from bottom-left to top-right, which is corresponding to intra prediction mode...
Today, several predictive video coding standards including MPEG2, MPEG4, H.264, VC1, DivX, VP6 and VP8 do exists. By design, the decoder is typically 10× lower complex than encoder. There are certain classes of emerging applications and services including mobile video, wireless camera, wireless low power surveillance, mobile document scanner and disposable video cameras, which demands lower complexity...
Scalable video coding provides an efficient adaptation solution for delivering video to consumer devices with a great variety of characteristics. This technique encodes video using a base layer and several enhancement layers with different qualities. In order to reduce the total bit rate of the video stream, inter layer prediction (ILP) is enabled. However, the introduction of ILP results in a high...
High Efficiency Video Coding (HEVC) is the latest compression standard designed at improving the efficiency of all video streams. Most research on the subject of HEVC focuses on the improvements of video compression efficiency. In this paper, work is conducted into streaming of HEVC over delay-prone wired networks. The transmission of data over delay-prone networks will affect the quality of the data...
This paper presents the bandwidth extension (BWE) method developed for the AMR-WB interoperable (AMR-WB IO) modes of the 3GPP EVS codec. The low-band signal (0–6.4 kHz) is coded using an enhanced version of ACELP as in AMR-WB and post-processed; the high-band (above 6.4 kHz) in contrast to AMR-WB is represented with a new BWE method. The decoded low-band excitation is adaptively extended to high frequencies...
Dynamic Adaptive Streaming over HTTP (DASH) has gained wide acceptance due to its ability of bitrate adaptation in diverse network conditions. In the meanwhile, it is asserted that the Scalable Extension (SHVC) of High Efficiency Video Coding (HEVC) can bring more efficient storage and caching compared with traditional single-layer video coding. However, using of SHVC in DASH raises the downstream...
SPIHT algorithm is well known reference for image coding algorithms. In this paper we present its specific extension called SM SPIHT related to region of interest encoding (ROI) but extending this approach further, ending with individual weight of importance for each pixel in image using the form of saliency map (SM). With carefully designed saliency map the approach has proven to be effective. The...
Scalable High Efficiency Video Coding (SHVC) is the extension of the High Efficiency Video Coding (HEVC). This standard is developed to ameliorate the coding efficiency for the spatial and quality scalability. In this paper, we investigate a survey for SHVC extension. We describe also its types and explain the different additional coding tools that further improve the Enhancement Layer (EL) coding...
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