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In this paper, we present an optical computing method for string data alignment applicable to genome information analysis. By applying moire technique to spatial encoding patterns of deoxyribonucleic acid (DNA) sequences, association information of the genome and the expressed phenotypes could more effectively be extracted. Such moire fringes reveal occurrence of matching, deletion and insertion between...
The idea of relating cyclic codes and frequency hopping (FH) sequences has yielded families of FH sequences, which meet tight bounds. Reed Solomon based FH sequences are an instance of such families. In this paper, these sequences are investigated for Galois fields of characteristic two. More specifically, the symbols utilized in each of sequences are calculated for two important cases, where hamming...
Waveform design plays a significant role in the design of radar systems. Multifrequency complementary phase-coded radar signals, because of their prominent properties have been of interest of many researchers. But the large variations of amplitude due to multicarrier make it susceptible to system nonlinearities. The multifrequency radar signal uses P subcarriers simultaneously. Each subcarriers are...
Underwater navigation that relies solely on dead reckoning suffers from unbounded position error growth. In traditional positioning method, the cost and trouble of deploying, recovering, and assembly have become insuperable obstacle. Based on combination SLBL with an Argo float, a new positioning method of autonomous navigation is proposed in the paper. In order to improve the ranging accuracy, with...
We study a caching problem that resembles a lossy Gray-Wyner network: A source produces vector samples from a Gaussian distribution, but the user is interested in the samples of only one component. The encoder first sends a cache message without any knowledge of the user's preference. Upon learning her request, a second message is provided in the update phase so as to attain the desired fidelity on...
Any tampering in an image or a video is followed by re-compression, thus resulting in double compression. Detecting double compression is a challenge in video forensics. Estimating the period of the Group of Pictures (GOP) in first compression is a clue to detect the double compression, as it gives a way to trace the processing history of the video. This paper, proposes a new method based on the mean...
In this paper, an extensive study of different video texture properties based on encoding statistics extracted from the HEVC HM reference software is presented. Mode selection, partitioning, motion vectors and bitrate allocation are among the statistics obtained from the encoder. For this study, a new dataset of homogeneous static and dynamic video textures, HomTex, is proposed. A comprehensive investigation...
This paper presents a set of criteria to help selecting an approximate optimal compression algorithm from the available range. It is shown that the proposed criteria provide a good degree of compression of the telemetry data of various types while improving system performance.
High Efficiency Video Coding (HEVC) is known to be the state of the art in video compression. However, aiming at real-time applications, its very high number of possible coding options makes it necessary to approximate the selection of coding modes by fast algorithms. For this purpose Coding Unit (CU) split decisions are made by Support Vector Machine (SVM) classifiers in this paper. We use one SVM...
Stochastic logic performs computation on data represented by random bit streams. The representation allows complex arithmetic to be performed with very simple logic, but it suffers from high latency and poor precision. Furthermore, the results are always somewhat inaccurate due to random fluctuations. The random or pseudorandom sources required to generate the representation are costly, consuming...
As a 3D video extension of Audio Video Coding Standard (AVS), 3D-AVS is being developed to improve the coding efficiency of multi-view video. Since multi-view video is composed of projections of the same scenery from different viewpoints at the same time instant, it contains a large amount of inter-view redundancies. To exploit the inter-view correlation, this paper presents a method to derive the...
MV-HEVC is a 3D extension of the High Efficiency Video Coding (HEVC) standard, which is developed to improve the coding efficiency of multi-view video. However, this improved efficiency leads to greater computational complexity. Recently, how to reduce the encoding time for multi-view coding is becoming a hot issue in real-time applications. In this paper, a fast coding unit (CU) decision algorithm...
In this paper, we propose a frequency coding waveform with a nonlinear frequency modulation (NLFM) signal for the multiple-input multiple-output (MIMO) radar. The transmitted signal of each transmitting antenna is a pulse train, of which, the sub-pulses are NLFM signals with different carrier frequencies. The frequency sequence and the parameter of the nonlinear frequency function are optimized to...
The emerging High-Efficiency Video Coding (HEVC) standard has introduced a number of new coding tools, such as a quad-tree based coding unit (CU). The quadtree-structured coding unit achieves significant coding efficiency improvements compared to H264/AVC. However, the complexity of CU depth decision associated with Rate-Distortion (R-D) cost computation dramatically increased. In order to alleviate...
Motion vectors of depth-maps in multiview and free-viewpoint videos exhibit strong spatial as well as inter-component clustering tendency. This paper presents a novel coding technique that first compresses the multidimensional bitmaps of macroblock mode and then encodes only the non-zero components of motion vectors. The bitmaps are partitioned into disjoint cuboids using binary tree based decomposition...
Reducing the correlation level lies at the core of the waveform design for multiple-input multiple-output (MIMO) radar system. In this paper, a new approach to the design of waveform for MIMO radar is proposed. The multiple pulse train coding is employed and the compression accumulation is introduced. In this manner, the waveform correlation can be almost eliminated and the optimal compression accumulation...
A hybrid ECG compression technique based on DWT and reducing the correlation between signal samples and beats has been presented in this paper. It starts by segmenting the ECG signal into blocks; each has 1024 samples. Then, DPCM approach is adopted by removing the redundancy between successive samples. So, residual signal of QRS-complex like waveform without the presence of P-, T- and U-waves is...
In this paper, a novel Joint Source-Channel Coding scheme based on Irregular Repeat-Accumulate codec is proposed for the transmission of Hidden Markov Source in AWGN scenarios. The encoder structure of the scheme consists of two units, one for source assign and another for encode. The simulation results demonstrate that the proposed scheme have better compression performance than the traditional code...
High Efficiency Video Coding (HEVC) is a novel video compression standard. It provides significantly better performance than its predecessor, but introduces high computational complexity due its hierarchical block structure. Determining Coding Units (CU), Prediction Units (PU), and Transform Units (TU) size is a time consuming process, as block partitioning decisions are based on rate-distortion optimization...
This paper proposes a fast algorithm to reduce the high computational complexity of depth map coding in 3D-HEVC, which obstructs 3D video from the practical applications. Due to the special feature of depth maps, depth modelling modes (DMMs) were developed to keep sharp edges for depth map. Consequently, the 3D-HEVC encoder can improve the coding performance of synthesized views significantly. However,...
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