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In this paper, a new QR code binarization method is presented according to the QR code characteristic to improve the accuracy of QR code decoding in mobile image processing. The Sauvola's thresholding algorithm is modified to solve QR code image binarization which is the threshold decision in the uneven light condition. Experiments show that the proposed algorithm has better correctness of recognition...
Turbo codes has excellent error correcting performance in low SNR condition. The design of interleaver in Turbo codes directly affects the Turbo decoding performance. Based on analysing the design rules and types of interleaver, a random interleaver is designed by taking advantage of the ergodic property of m sequence. The simulation results show that applying this random interleaver can remarkably...
The spatial domain resolution adjustable method is raised, based on the Region of Interest. The original input image is divided into the region of interest and the region of non-interest in accordance with the RIO information. As to the region of interest, perform coding on the resolution of the original image. As for the region of non-interest, first extract samples and then encode these samples...
H.264 adopts variable length coding and interprediction techniques, so compressed image is very sensitive to channel error. Meanwhile errors will influence subsequent frames, easily leading to the distortion of rebuilding images. To enhance the quality of reconstructed images, this text proposes a weighted outer boundary matching algorithms based on multiple reference frames, which exploits the characteristic...
Cooperative cognitive UWB system is one of the hottest topics in wireless communication areas. Rate control technology is the key technology of it. An algorithm of rate control using RCP-LDPC code in DF cognitive UWB systems is proposed, which comprised of grouping and selecting, and a suitable RCP-LDPC code is constructed. Simulation results show that the proposed rate control puncture scheme is...
The paper has a unique insight into the recently emerging erasure correcting codes, LT codes, in terms of its crucial structure of Robust Soliton Distribution in the truncation form. We propose a truncation scheme on the original degree distribution to achieve a higher decoding success probability while slightly decreasing the operational complexity. We test the influence of the truncation length...
As the complexity of the 3G mobile communications environment, the limitation of the wireless transmission frequency band resources, in order to achieve the transmission and reconstruction of low bit rate, high-quality audio signal, a modified EAAC+ mobile audio coding algorithm based on the existing technology of speech or audio bandwidth extension research is presented in this paper. The algorithm...
In the design of mobile phone monitoring system, the balance of real-time video playback fluency and clarity is the key of the design work. For this problem, the designer can use image data compression international standard, such as MPEG standards, and real-time transport protocol RTP to reallize real-time video data transmission on GPRS, but the final result is extremely poor. On the basis of introducing...
In connection with the trend at Compression Solution For Monitoring Video Based On H.264, this paper propose an Efficient Compression Solution For Monitoring Video based on removal of redundant content, and describe it with the idea of Content Detection and Layered Quantization. This paper focus on the methods and implementation process of Macroblock-level layered quantization, and also analysis the...
Many problems have been identified in Internet applications such as slow network-access speed, frequent packet loss, etc. The constraints on bandwidth, excessive server downloading, instability of network performance and other factors may contribute to these problems. To seek the solutions to these problems in Internet, the author in this paper proposes the CDN (Content Delivery Network)-and-H.264...
MB-OFDM UWB technology has attracted much attention in high speed wireless communications. A UWB communication system with channel coding is noticing for avoiding the performance degradation due to adverse channel propagation conditions. In this paper, we propose a novel Euclidean Geometry low-density parity-check (LDPC) coding scheme for MB-OFDM UWB systems. We emphasized on the construction of Euclidean...
This work focuses on generating better side information by exploiting the gains of variable block size based motion-compensated interpolation (VBMCI). Wyner-Ziv video coding (WZVC) conduct temporal prediction at the decoder, and this leads two results: temporal prediction has no access to the current frame and there is no motion vectors sent from the encoder to the decoder. Both make traditional variable...
AVS is Chinese standard with independent intellectual property rights for the second-generation source coding. In this paper, we give an overview of AVS and stream structure. Then we analyze the influence of bit error in various group fields and classify those fields by effects on the quality of the video sequence. On this basis, we find out a method to describe the performance of error resilience...
"What part of the video signal should be coded using what method" is a challenge for Wyner-Ziv video coding (WZVC). The challenge results from that in WZVC the temporal prediction is performed at the decoder, so the encoder hardly determines what part of the signal should be coded using what method. In this paper a novel coefficients classification strategy utilizing both texture information...
A novel constellation mapping VBLAST zero forcing detection algorithm in MIMO-OFDM system is proposed in this paper. First, the signal is cycled and successively mapped from the whole space of constellation points and is regarded as the first the underlying detection signals to maximize the performance of the first detection layers at the receiver. Then, the traditional ZF detection algorithm is used...
Undoubtedly, peer-to-Peer (P2P) technology is an effectively method for delivering streaming media content over the internet. However, current P2P stream systems also suffer many problems, such as huge bandwidth consumption, less effective in heterogeneous environment, protection of important data, etc. Scalable video coding (SVC), as an extension of H.264/AVC standard, has attracted many researchers...
Real-time Transport Protocol (RTP) is usually used to provide real time transportation and quality guarantee of scalable video coding (SVC) stream. Base on the analysis of SVC stream structure and real-time transport protocol, RTP encapsulation is implemented for H.264/SVC stream. A simulation method is proposed to simulate the transport process of the scalable video in the common test conditions...
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