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In this paper, an OS level power estimator based on monitored system events for multimedia mobile devices is presented. The OS level power estimator periodically obtains significant-events count values and calculates power-consumption estimations through mathematical models. We have implemented this power estimator in a Linux kernel and evaluated it while running a video decoder application on an...
Many advanced video transmission techniques rely on per-packet distortion estimates. To compute reliable estimates, however, the decoder inner workings, including the concealment module used in case of packet losses, should be fully known at the encoder. This paper explores the effects on video distortion estimation of encoder-side erroneous assumptions about the concealment technique used by the...
In recent years, proliferation of digital multimedia including images, audio, video and documents become popular due to on line distribution of digital multimedia. In such an open environment, it is convenient to get the access to various information sources. This increases the possibility of large-scale unauthorized copying of digital data. These concerns over protecting copyright have triggered...
A growing number of applications from various domains such as multimedia, machine learning and computer vision are inherently fault tolerant. However, for these soft workloads, not all computations are fault tolerant (e.g., A loop trip count). In this paper, we propose a compiler-based approach that takes advantage of soft computations inherent in the aforementioned class of workloads to bring down...
In this paper a new method, Variable Markov Oracle, for clustering time series data points is proposed. Variable Markov Oracle is based on previous results of Audio Oracle, a method of fast indexing repeating sub-clips in an audio stream. The proposed method is capable of discovering natural clusters with temporal relations without specifying the number of clusters. The discovery of inherent clusters...
Web-based learning tool provides incorporated environment of various technologies to support diverse instructor and learner needs via the Internet. Electronic learning materials can be accessed easily by normal students but not for dyslexic students. This is because student with Dyslexia needs more attention and guidance from the instructor and special tool is needed to improve their learning environment...
The modern multimedia devices require ever increasing processing power, which is to some extent limited, and to optimize the code to execute in real-time. This paper describes the optimization methods for VP8 decoder for processing video signals based on the MIPS32 architecture. Finally, the execution time was measured for the decoder with data set, improvement for both test cases was obtained. Percentage...
In this paper, we propose an effective design and implementation of a versatile embedded multimedia live streaming decoder system based on TI's DM814x processor, which can not only decode video live streams of various video codecs(H.264, MPEG-4, etc.), audio live streams of various audio codecs(AAC, MP3, G.711, etc.), but also demultiplex (demux) MPEG-2 TS, decode video stream and audio streams inside,...
In this work we have implemented and discussed the performance evaluation of Least Significant Bit (LSB) and Least Significant Digit (LSD) on various formats of multimedia data. We have shown the performance variation on different formats for which these two techniques have been applied to hide the messages. Implementation of both the algorithms has been done to explore the security and distortion...
A novel quantize-and-forward scheme with two relays is proposed in this paper. In our scheme, each relay only processes one bit of the quantized codeword. The principle of selecting the aforementioned bit is based on the channel condition of the relay links. Compared with the single-relay scheme, the system consumes the same resources, while each relay has a prolonged life since it only transmits...
Coding and decoding schemes are critical to the performance in wireless communication system. In Current coding scheme of LTE system, each transport block (TB) is segmented into several code blocks (CBs) which can be coded and decoded individually. If one of the CBs in a TB fails in decoding, the whole TB is required to be retransmitted. Channel estimation is very crucial for the correctness of the...
Reversible data hiding has emerged in recent years, and it has the fundamental requirement of reversibility. For reversible data hiding, secret information is embedded into original image with devised algorithms, and the marked image should be delivered to the decoder without any damage. For decoding, both the embedded secret and original image should be recovered perfectly. With these characteristics,...
Matrix Quantization (MQ), a very promising source coding technique, has already been successfully applied for speech signals and noiseless channels. MQ is also shown in the literature to outperform Vector Quantization (VQ) when applied over noisy channels. Considering that most sources of practical interest are non-stationary, this paper introduces a technique which adapts MQ to varying source statistics...
Nowadays, driven by the consumer demands, the multimedia market is booming and the video coding standards evolve rapidly. A dynamically coarse grain reconfigurable architecture REMUS-II (REconfigurable MUltimedia System 2) is developed as a multi-standards, high resolution, power efficient, and real-time multimedia decoding processor. The hierarchical pipeline is adopted in the REMUS-II for multimedia...
Media clouds provide an infrastructure for distributed processing and storage of multimedia applications. Each device in the media cloud is usually a mobile system consisting of several heterogeneous Processing Elements (PE). Energy efficiency has always been a challenge in this environment. In this paper, we propose a unified energy efficient algorithm for mapping multimedia applications on a media...
A seismic survey can produce a vast amount of data which is on the order of hundreds of terabytes. A high performance seismic data decompression algorithm can solve problems related not only to storage and transmission but also bandwidth. Decoding is one of the most expensive computational process in seismic data decompression due to the use of enthropy encoding algorithms as Huffman or arithmetic...
Min-Sum decoding is widely used for decoding LDPC codes in many modern digital video broadcasting decoding due to its relative low complexity and robustness against quantization error. However, the suboptimal performance of the Min-Sum affects the integrated performance of wireless receivers. In this paper, we present the idea of adapting the scaling factor of the Min-Sum decoder with iterations through...
Numerous Directed-Acyclic Graph (DAG) schedulers have been developed to improve the energy efficiency of various multi-core systems. However, the DAG monitoring modules proposed by these schedulers make a priori assumptions about the workload and relationship between the task dependencies. Thus, schedulers are limited to work on a limited subset of DAG models. To address this problem, we propose a...
Embedded devices in the present life have been very common and its largest feature, flexibility, is an important reason making embedded devices popularity in current. In this paper, based on the analysis of the above features of the embedded device, a real-time access of multimedia resources in the LAN system has been designed. The system finally implements playing text, image, audio, and video on...
Multiprocessor-system-on-a-chip (MPSoC) is the dominating architecture in embedded systems. Applications need to be multi-threaded to benefit from the concurrency provided by the MPSoC. Many parallel versions of the new emerging H.264/AVC [1] already exist. However, providing a full parallel H.264 version is blocked by the fact that all parts of the decoder depend on the first sequential stage of...
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