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We investigate dynamic voltage and frequency scaling (DVFS) for a network-on-chip (NoC) based H.264 video decoder. The investigation is done using a simulation framework that combines both the communication, i.e. the NoC, and the processing, i.e., H.264 modules, components into the same simulation. This approach allows for the NoC to be exercised with truly real traffic instead of synthetic traffic...
In order to compress omnidirectional video clips, a projection onto a two-dimensional image plane is necessary. The most commonly used projection format is the equirectangular panoramic projection, which results into a significant amount of redundant samples in the polar areas. The redundant samples incur extra bitrate and increase the encoding/decoding time. In this paper, we study regional down-sampling...
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...
To provide more powerful video enabled applications, e.g. in video surveillance environments, it is increasingly more critical not only to have access to the decoded video but also to, e.g. efficiently search for similar videos. In this context, this paper proposes a feature-based video coding solution adopting a hybrid approach where both pixels and local visual features are exploited for coding...
Today's car information systems (CIS) are growing into integrated cockpit systems, supporting not solely infotainment, such as navigation and AV playing/recording, but also driver assistance, such as surround view systems. Also, in-car video transfer via Ethernet is becoming widespread. Such networks connect camera modules, head unit controllers and rear-seat display units, and carry video signals...
Accurate modelling of the decoding energy of a CTU is essential to determine the appropriate level of quantization required for decoder energy-aware video encoding. The proposed method predicts the number of nonzero DCT coefficients, and their energy requirements with an average accuracy of 4.8% and 11.19%, respectively.
This paper presents a real-time closed-loop system to regulate the power consumption of multimedia mobile devices. The system feedback is an OS-level power estimator based on monitored events of the target system, i.e., an embedded development platform executing a video decoder. The implementation results match the expected ones from simulation and confirm that the system works with a suitable controller...
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...
8K Ultra HD is being promoted as the next-generation digital video format. From a communication channel perspective, the latest high-efficiency video coding standard (H.265/HEVC) greatly enhances the feasibility of 8K by doubling the compression ratio. Implementation of such codecs is a challenge, owing to ultra-high throughput requirements and increased complexity per pixel. The former corresponds...
The evolution of multimedia encoding techniques allows efficiently provisioning video services at different quality levels. However, resulting streams lead to different energy consumptions making it difficult to simultaneously satisfy both energy consumption and quality requirements. In order to deal with the resulting trade-off, in this paper we propose a novel joint optimization method of energy...
With video surveillance systems becoming ubiquitous nowadays, protecting people's privacy raises an increasingly serious concern. Video streaming with privacy protection requires modifying parts of the video content. This modification should provide the possibility of unprotected access to the video if the user is authenticated through a private key. However, any modification in the content of a video...
Through measurements on our testbed, we show how users of Netflix could make energy savings of up to 34% by adjusting video quality settings. We estimate the impacts of these quality settings on the energy consumption of client systems and the network. If users exercise choice in their video streaming habits, over 100 GWh of energy a year could be saved on a global scale. We discuss how providing...
This paper presents the implementation of a hardware-based H.264 Video Decoder employing real-time transport protocol (RTP). The supported video resolution is 176×144 at 30 fps. The hardware selected is the Lattice ECP3 FPGA at a frequency of 1.5 MHz. The FPGA process flow is used to validate the implementation. Cadence NC-Verilog tool is used for simulation and Lattice Diamond tool is used for Synthesis,...
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...
Encoded video bitstream is subjected to quality degradation when transmitted over unreliable network. Therefore, a novel feedback-based intra refresh method for robust video coding is proposed in this paper, which takes error concealment's effect, actual loss condition, and the structure of feedback into account. In the decoder, the error correction priority is calculated to reflect the error degree...
Video decoding is a must-have feature in modern electronic devices in consumer market. A real-time processing demand is crucial in H.264 video application. In this paper, we present a fast H.264 video decoding technology based on a fast and quick bit pattern extraction method in video stream that is coded with variable-length code stored in little-endian systems. The Key of our approach is to make...
The article presents structural logic schemes of building decision support systems in crisis situations with providing support for video conferencing based on heterogeneous networks. The proposed structural solutions allow implementing them with the use of any data transmission systems of the conditions of implementation of new compression technology based on the presented methods and models of adaptive...
Centralised management of distributed systems require a significant amount of monitoring traffic to maintain an accurate view of the system global state. The communication overhead of these systems becomes a bottleneck as the number of processing elements in the network and workload increase. State-of-the art in decentralised resource management techniques address this issue by allowing individual...
In this paper, we utilize the knowledge of frame type and structure combined with multimode precoded MIMO transmission scheme for video stream, in order to achieve a better tradeoff of physicl layer performance (eg., SER) and the transmission delay via a proposed two-stage selection algorithms. The algorithm adaptively selects the optimal transmission mode (DIV or MUX) and the corresponding precoder...
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