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Progressive download for multi-view video delivery is one of promising techniques to provide immersive and interactive experiences to users. In conventional multi-view video systems, a user downloads videos of all viewpoints of one content to realize smooth view switching. However, it causes increase of video traffic, and thus low video quality within an available download rate. To download only a...
The recent research studies showed that inter-layered network coding is a promising approach to provide the unequal error protection for scalable video multicast under the channel heterogeneity. The selection of the optimal transmission distribution performed at eNB increases the system performance with the cost of time and computational complexities. In this paper, we propose an optimal transmission...
An HEVC format-compliant joint selective encryption and data embedding technique is proposed. The proposed technique is separable, where the decryption and data extraction processes are independent, with minimal parsing overhead. Specifically, elements in the HEVC coding structure are divided into two groups, where one group is manipulated to perceptually mask the video content, while another is modified...
Rate control scheme plays a vital role in the circumstances of region-of-interest (ROI) based video coding, aiming to allocate a higher bit rate to the ROI while setting a relative lower bit rate ratio in non-ROI to maintain the total bit rate close to the assigned target value. Among various rate control models, the R-Lambda based rate control model outperforming other models. Unfortunately, the...
All multimedia devices now incorporate video CODECs that comply with international video coding standards such as H.264 / MPEG4-AVC and the new High Efficiency Video Coding Standard (HEVC) otherwise known as H.265. Although the standard CODECs have been designed to include algorithms with optimal efficiency, large number of coding parameters that can be used to fine tune their operation, within known...
Rate control plays a key role in video coding, which has a significant effect on encoder performance. With parallel video coding frameworks more and more popular, rate control suitable for parallel coding is highly desired. However, most rate control algorithms only focus on the rate distortion performance but ignoring the data correlation in parallel coding. In this paper, based on the parallel framework...
This paper presents a review of parametric models for video quality estimation standardized in the past few years. The focus of this paper is the estimation of quality degradation caused by the compression artifacts. The models introduced in the paper contain the work of Telecommunication Standardization Section of the International Telecommunication Union (ITU-T) Study Group 9 and Study Group 12,...
This paper presents a new scalable coding (SC) algorithm considering the properties of human visual system (HVS), especially the importance of structures and saliencies for visual perception. The proposed method first finds the salient regions in an image and then applies structure preserving filter to the regions excluding the saliencies. This image is encoded with a pre-specified quantization parameter...
Cognitive radios use idle slots in the already assigned licensed frequency bands for communication in such a way that it does not affect the service being offered to the existing user in that band. The aim of cognitive radio network is to improve the spectrum efficiency and to increase the overall channel utilization which is a scarce resource. Multimedia traffic is especially suited to such environment...
This work presents a comparison of two implementations of the last software version of The High Efficiency Video Coding (HEVC) decoder in a single low cost processor ARM Cortex-A series using NEON architecture which is a Single Input Multiple Data (SIMD). By using this technology of optimization, the whole execution time is reduced up to x4. We have analyzed separately all the blocks in the decoder...
One of the challenges in video rate control lies in accurately achieving the target bitrate by determining coding parameter set. In HEVC, nontexture bits become more significantly important, due to the adoption of more coding tools compared to H.264 standards. In this paper, we propose an accurate rate model to estimate the size of nontexture bits accurately. In addition, parameter update conditions...
Multicolored Matrix (MCM) Code is a two-dimensional color coded matrix. It consists a sequence of images rendered at an optimum frame rate to transfer simple data between portable devices such as a mobile phone. We introduce an untried channel-less short range communication technology, designed with limitless storage capacity, great structural stability and flexibility due to which it can work in...
Enormous usage of multimedia necessitates maintaining a secured environment. Security in multimedia communication can be achieved with many cryptographic techniques. Perceptual video encryption is an essential technique to prevent the unwanted use of the video which is transmitted. Encryption is used in order to maintain a safe content of data from attackers. This paper explains about the perceptual...
Random linear network coding simplifies routing decisions, improves throughput, and increases tolerance against packet loss. A substantial limitation, however, is delay: decoding requires as many independent linear combinations as data blocks. Hierarchical network coding purportedly solves this delay problem. It introduces layers to decode prioritized data blocks early, which may benefit video streaming...
Green computing and energy efficiency has become an important issue in today's rapidly growing multimedia transmission. Meanwhile users want high-quality content to be viewed anywhere, content producers must think alternatives for cutting expenses in the server. Usually multiple sub-streams from the original video feed are needed for clients with unique device characteristics, which can notably load...
In recent years, video streaming has contribute 40% traffic in LTE wireless networks. However, battery has been a bottleneck for user to enjoy the high quality video since the progress of battery technique is far less than the advancement of wireless technique. How to enable users to enjoy video streaming given limited battery is an urgent problem. In this paper, we propose a video transmission mechanism...
Coded caching is a technique that receives much attention in the network literature, since it is able to achieve significant gains compared to the conventional uncoded caching schemes. In this paper, we first identify a family of placement and delivery schemes. Then we derive a lower bound on the average rate for the identified schemes. Based on the clue in deriving the lower bound, a new delivery...
Multimedia application on mobile phone platform is a hot topic in Information Technology industry accompanying with the advances of technologies in Internet, smart operating system and wireless network. The development of streaming media technology boosts the audio and video application over the Internet. This paper describes a mobile video live streaming system with Wi-Fi/4G mobile phone to capture...
Digital videos are to be stored, processed and transmitted in the encryption of compressed video bit streams in order to maintain security. Data has to be hidden in these encrypted videos for the purpose of content notation and tampering detection. Data hiding without decryption preserves the confidentiality of the content more efficiently. Data hiding is the encrypted version of H.264/AVC video streams...
This paper presents a framework for evaluating quality of video encoding algorithms. This technique works by collecting source videos, encoding the source videos with a given algorithm, and decoding the compressed sequences. The decoded video shall be measured with the original sources in a specific evaluation method and feedback to the algorithm. Under the guidance of this framework, an implementation...
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