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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...
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.
Contemporary camera-equipped wearable devices, such as smartphones and tablets, are now powerful enough to be used as ubiquitous remote sources of live video streams. However, as these devices may operate in various positions, including upside down or rotated, encoding the captured video into a data format suitable for live streaming also includes the rotation of video frames to compensate the device...
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...
In recent years there has been an increasing interest in H.264/ MPEG-4 part 10 video coding standard. This is the latest coding standard which attains very high data compression. MPEG stands for moving picture experts group which was formed by ISO in order to define standards for audio and video coding and also transmission. This paper gives an idea of decorrelation and entropy coding of motion information...
In emergency scenarios, e.g., natural disasters, the infrastructure of telecommunication system is partially or even completely disrupted. While the bandwidth and energy resources of system are limited, the maltimedia communication demand of myriad usen may reach the peak of data traffic. This in tum makes the system more challenging to serve the users high quality of maltimedia streaming with con...
Video analyzers are employed to perform an in depth analysis of coding decisions undertaken during the execution of a video codec. Medical diagnostic videos, which are typically dealt with in telemedicine scenarios need careful examination to incorporate the most optimum coding decisions. This paper deals with the enhancement of an open-source video stream analyzer to facilitate codec development...
Chain coding is widely used in image compression to encode the boundaries of objects efficiently. Although chain codes are effective, they still need large amount of memory to store the codes. Therefore, an efficient encoding technique for chain codes is required. In this paper, we propose an algorithm to encode contours losslessly. First, the morphological operation is applied to shrink the contours...
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...
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...
In this paper, a RTP streaming media application for video signals on demand or multicast is proposed based on MPEG-4 coding features and RTP/RTCP principles. A optibase's MPEG-4 Movie Maker 400 card and Apple's DARWIN streaming media sever are used, and RTP packing algorithm based on the MPEG-4 transmission is also used. Experiments show that the algorithm has efficient transmission and packet loss...
In order to solve the existing problem which H.264 video transmission encryption technology can not meet a good compromise between security and encryption efficiency, this paper puts forward a H.264 video transmission encryption technology based on Blowfish algorithm. The experimental results show that this encryption technology can obtain a good compromise between security and encryption efficiency...
In recent years, the distinctive advancement of handling huge data promotes the evolution of ubiquitous computing and analysis technologies. With the constantly upward system burden and computational complexity, adaptive coding has been a fascinating topic for pattern analysis, with outstanding performance. In this work, a continuous hashing method, termed continuous random hashing (CRH), is proposed...
Emerging screen content coding brings great challenges to rate control due to significantly different characteristics of screen content from conventional video, e.g. large motion, frequent scene changes. This paper proposes an efficient rate control scheme for screen content coding by considering the characteristics of screen content. We first classify pictures of a video sequence into different groups...
Adaptive video streaming has become prominent due to the rising diversity of Web-enabled personal devices. Common limitations in bandwidth and decoding power challenge the efficiency of content encoders to preserve visual quality at reduced data rates over a wide range of display resolutions. Objective assessment of perceptual video quality has greatly improved in the past decade but remains an open...
With the rapid development in internet and video coding technology, applications such as telesurgery and remote operations are becoming more and more popular. In such applications, any delay will significantly lower the performance and may sometimes lead to catastrophic results. As a result, low-delay video streaming is demanded in such applications. Previous works have explored and established several...
Relevance of the questions connected to improvement of quality of provision of specific images with using of aeromonitoring. Need of enhancement of technologies of coding of a video stream is justified. Creation of a method for an assessment of algorithmic complexity for a method of processing of basic frames on the basis of diagonal-uneven positional coding of transformants in nonequilibrium base...
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