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In the field of deep neural networks, several generative methods have been proposed to address the challenges from generative and discriminative tasks, e.g., natural language process, image caption and image generation. In this paper, a conditional recurrent variational autoencoder is proposed for multi-digit image synthesis. This model is capable of generating multi-digit images from the given number...
The goal of this work is to provide a low complexity video decoding solution for High Efficiency Video Coding (HEVC) streams in applications where only a region of the video frames is needed to be decoded. This paper studies the problem of creating selfcontained (i.e., independently decodable) partitions in the HEVC streams. Further, the requirements for building self-contained regions are described,...
Barcode is one of the existing systems, very fast in scanning and more accurate as compared to other coding systems. Barcode is extensively used because the speed of scanning the barcode is very high as compared to manual data entry. 2D barcodes are developed to increase the capacity compared to 1D barcode. The challenge in the development of barcode is in its decoding. The algorithm should be able...
Text messages are generally encoded by performing table look-up on fixed length code tables. In this paper, a lossless text compression algorithm which works on the principle of entropy reduction is proposed. Characters in a text message in any language are generally encoded using a binary string with a Unique Lexicographical Rank (ULR). A corresponding Maximum Rank(MR) for any binary string can be...
In this paper, we establish the ε-capacity region for the AWGN multiple access channel (MAC) with feedback under an expected power constraint by combining ideas from binary hypothesis testing, information spectrum analysis, Ozarow's coding scheme, and power control.
Due to high requirements on network capacity during network transmission, video signals have to be compressed. Compression process and network transmission introduce different compression artifacts and packet loss (PL) artifacts in video signals, respectively. These artifacts degrade visual quality of video signal and thus video quality has to be continuously measured and monitored in order to assure...
Currently, the data storage medium in digital form are widely applied in various fields, including in the medical world. The excessive size of the digital medical image digital poses problems in terms of storage and the time to transmit these images through the Internet. To overcome these problems, a digital image compression can be conducted. This procedure is conducted to maintain the image quality...
This article studies the performance of decision-based cooperative spectrum sensing using random medium access. Unlike scheduled medium access, random medium access entails a non negligible probability of collision which affects the detection accuracy. Novel closed form expressions are derived for the detection probability, the false alarm probability, and the average reporting time, assuming the...
The newly developed second generations standards for digital video broadcasting (DVB-T2, DVB-S2) emerges as a significant upgrade over its first generation predecessor. Low-Density Parity-Check (LDPC) codes received a lot of attention by their superb error-correcting capability and have been adopted as main error correct coding scheme by second generation Digital Video Broadcasting standards. The...
This work proposes a transceiver architecture for the OFDM PHY of IEEE802.15.4g standard targeting Smart Metering Utility Networks. It also details the main components implemented for preliminary hardware prototyping. The OFDM transceiver is part of a project that is under development and aims to implement in ASIC the three PHYs defined by the IEEE802.15.4g standard, i.e. MR-FSK, MR-OQPSK and MR-OFDM...
The coding performance of the normative encoder of the JPEG XT in profile is analyzed and the problem on the encoder is summarized in this paper. It is pointed out that there is a mismatch in the handling of the quantization error between the normative encoder and the standard decoder. To avoid this problem, an improved structure has been proposed with consideration of the mismatch. The experimental...
This paper considers multilevel multithreshold decoder for a self-orthogonal codes. Simulation results for an AWGN channel are reported. New modifications of this decoder provided coding gain improving by a few tenths of dB due to better using of the bits soft information are offered. Recommendations to choose the best algorithms of constituting blocks of the multilevel multithreshold decoder and...
Today's “connected soldier” is both the source of and destination for electronically transmitted data used by an ever growing range of battlefield information services. In much the same way as the demand for new video services has driven innovation in the consumer domain, the acquisition and dissemination of high resolution Full Motion Video (FMV), either for surveillance and intelligence gathering...
In this information age, a efficient video encoding/decoding technology will help reducing information redundancy, delaying processing, enhancing the robustness, improving visual perception of quality, increasing the compression ratio, etc. At first, this article describes the history of video encoding/decoding standards development. Research on the key technologies of H.264 coding standard currently...
The Thor video codec is being developed by Cisco with the intention to use only royalty-free coding tools. The video codec is based on the well-known block-based hybrid video coding approach, but with some significant changes compared to existing standards such as AVC/H.264 and HEVC/H.265. These changes include transform coefficient coding, deblocking filter, a separate deringing filter, and interpolated...
In shortening based coding design, a certain amount of known information bits (for instance, all 0 bits) will be inserted into each information packet for encoding and be removed before transmission. Since they are known, the decoder can assume a complete codeword in decoding, even those known bits are not delivered at all. Basically, shortening provides a framework to generate a set of more powerful...
Digital Video Broadcasting — Satellite — Second Generation (DVB-S2) and Digital Video Broadcasting — Return Channel via Satellite (DVB-RCS) are two important commercial satellite communications (SATCOM) standards, for forward link and return link information transmission via satellites, correspondingly. Advanced channel coding schemes have been designed in DVB-S2 and DVB-RCS to mitigate the information...
Paper describes method that use intentional downsampling of the video sequence as part of the pre-processing step before being compressed, and the application of SR techniques as a post-processing of the compressed sequence. This scheme can be utilized as a bitrate control mechanism to optimize the overall quality of the high resolution (HR) reconstructed video. The main difference between the conventional...
Intra prediction is an important component of video compression. The High Efficiency Video Coding (HEVC) standard supports advanced Intra prediction tools to achieve remarkable Intra coding performance. However, higher compression efficiency performance may be achieved using Combined Intra Prediction (CIP). CIP consists in combining conventional Intra reference samples, with samples extracted from...
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,...
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