multiple descriptions coinciding lattice vector quantizer for h 264 avc and motion jpeg2000
Báo cáo hóa học: " Editorial Advanced Video Technologies and Applications for H.264/AVC and Beyond" ppt
... for H. 264/ AVC, ” Pan et al design a scalable fast RDO algorithm to effectively choose the best coding mode by initially searching the most probable modes The paper, “Rate control for H. 264 with ... strategy for H. 264, which maximizes the video quality by determining the quantization parameter (QP) for each macroblock With a preanalysis coarse QP, the refinement of the QP is further enhanced ... using the information of motion- compensated residues By adopting motion estimation and rate control mechanism, the paper “Efficient video transcoding from H. 263 to H. 264/ AVC standard with enhanced...
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Báo cáo hóa học: " Research Article Improved Intra-coding Methods for H.264/AVC" docx
... scheme) and enhanced BMA intraprediction scheme (E-BMA scheme), the standard intraprediction scheme in H. 264/ AVC (S scheme) [1], the original BMA intracoding scheme (BMA scheme) [7], and the hybrid ... within the block, which shows more promising performance under high bitrates Also the video contents would affect the performance of these two schemes due to the distribution of smooth regions and ... concludes the paper Two Prediction Schemes for Intracoding of H. 264/ AVC In this section, we will explain the improvement mechanism behind the recursive prediction scheme and the enhanced BMA...
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Báo cáo hóa học: " Research Article A Multiple-Window Video Embedding Transcoder Based on H.264/AVC Standard" ppt
... neighboring three motion vectors rather than the motion vector itself Hence an identical motion vector predictor is needed for both encoder and decoder However, due Chih-Hung Li et al to foreground ... region as defined in H. 264/ AVC standard For each region, the encoder performs the prediction and filtering processes without referring to the pixels of the other regions For the video embedding ... there is an encoding constraint for the foreground bitstream that the unrestricted motion vectors and the intra-DC modes are not used for the blocks at the first column or the first row When the...
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Báo cáo hóa học: " Scalable Fast Rate-Distortion Optimization for H.264/AVC" docx
... coding modes for different sequences and INTRA4 × modes On the other hand, for fast -motion and high-complexity sequences such as “Foreman,” “Mobile,” and “Stefan,” more than 40% of their MBs are ... according to the occurring probability of that mode such that the mode that has the highest occurring probability is placed at the beginning of the priority queue The mean value and standard deviation ... broadcasting, and pattern recognition He has published more than 70 technical papers, and conducted many short courses for industry in the above areas He was the General Chairman of the 7th International...
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Báo cáo hóa học: "Robust System and Cross-Layer Design for H.264/AVC-Based Wireless Video Applications" pptx
... shows the average PSNR over the application layer throughput ηAL for different system designs for RLC-PDU loss rate of 1% (left-hand side) and 10% (right-hand side) For both cases, we assume that ... packet, and the NAL unit header coserves as an RTP payload header Each NAL unit consists of a one-byte header and the payload byte string The header indicates the type of the NAL unit and whether ... and cross-layer information Although the standardization process for H. 264/ AVC is finalized, the freedom at the encoder as well as the combination with transport modes such as FEC and retransmission...
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Báo cáo khoa học: "Orthogonal Negation in Vector Spaces for Modelling Word-Meanings and Document Retrieval" ppt
... to vector negation on these queries (though the vector negation results are slightly better) This is with queries where the negated term is the closest neighbour of the positive term, and the ... which were also synonyms of the positive term were discounted On the whole fewer such synonyms were found in the Ohsumed and NYT documents, which have many medical terms and proper names which ... general method for deciding ‘how much to subtract’ We shall refer to such methods as ‘Constant Subtraction’ Evaluation and Results This section describes experiments which compare the three methods...
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Báo cáo sinh học: " Novel data storage for H.264 motion compensation: system architecture and hardware implementation" pdf
... propose a vectorized memory storage scheme and the associated addressing scheme, which were both designed for the specific needs of the q-pel MC algorithm The proposed method may be used at both the ... EP4SGX230KF40C2 has been used A stand alone H. 264 q-pel MC block has achieved speeds between 95.9 fps for HD1080p frames, 229 fps for HD 720p and between 2502 and 1262 fps for CIF and QCIF formats These ... the features of H. 264/ AVC that aids in attaining a much better compression factor than what was possible in preceding standards The better performance however also brings higher requirements for...
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báo cáo hóa học:" Novel data storage for H.264 motion compensation: system architecture and hardware implementation" doc
... propose a vectorized memory storage scheme and the associated addressing scheme, which were both designed for the specific needs of the q-pel MC algorithm The proposed method may be used at both the ... EP4SGX230KF40C2 has been used A stand alone H. 264 q-pel MC block has achieved speeds between 95.9 fps for HD1080p frames, 229 fps for HD 720p and between 2502 and 1262 fps for CIF and QCIF formats These ... the features of H. 264/ AVC that aids in attaining a much better compression factor than what was possible in preceding standards The better performance however also brings higher requirements for...
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Báo cáo toán học: " Novel data storage for H.264 motion compensation: system architecture and hardware implementation" pot
... the memory This design is highly pipelined It performs simultaneously the inter-prediction for luma and chromas The luma pipeline has a higher processing delay than the pipeline serving the chromas ... a vectorized memory storage scheme and the associated addressing scheme, which were both designed for the specific needs of the q-pel MC algorithm The proposed method may be used at both the ... q, and r, based on the half sample values H. 264 employs a 6-tap FIR filter and a bilinear filter for the first and the second steps, respectively [1] In H. 264, the horizontal or vertical half...
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Báo cáo hóa học: " Efficient bitstream switching for streaming of H.264/AVC coded video" doc
... the switching instant) will be much higher than the bandwidth derived from the FOR with SP-frames This high bit rate of the SSP-frame can be reduced by changing the (QPSP, QPSP2) pairs, but this ... video (hence lower bit rate) and then switched to a higher quality video when sufficient bandwidth becomes available or the bandwidth requirement of high-quality video is reduced with time which is ... LOS Here, I-frame is taken as the pre-fetched bits which are more than the bits of the SP-frames Figures 11 and 12 show the bandwidth utilization and the buffer contents, respectively, for the...
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báo cáo hóa học:" Research Article FPSoC-Based Architecture for a Fast Motion Estimation Algorithm in H.264/AVC" doc
... SUMH However we can expand our architecture to support other types of search, for example, Full Search, and so forth The search pass depends on the search step and the search range We show for ... increase of the modified SUMH when compared with Full Search ME and SUMH Finally Table shows the average Y-PSNR loss of the modified SUMH when compared with Full Search ME and SUMH From Figures and 4, ... in the “Foreman” sequence, while the least PSNR losses occur in “Silent.” This is because the “Foreman” sequence has both high local object motion and greater highfrequency content It therefore...
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Báo cáo hóa học: " Rate Control for H.264 with Two-Step Quantization Parameter Determination but Single-Pass Encoding" ppt
... the Chair for two IEEE technical committees He was the General Chair for the IEEE Hot Chips Symposium in 1995 He is currently the Technical Program Cochair for ISCAS ’07 and the Program Cochair ... Sciences, Shanghai, China, in 1997, and the Ph.D degree from Shanghai Jiao Tong University, Shanghai, China, in 2000 From September 2000 to March 2002, he worked as a Research Fellow in Centre for Signal ... prediction modes in the preanalysis stage and RDO stage are avoided as much as possible But thanks to the QP refinement algorithm, the performances of those high motion and high bit rate sequences...
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Báo cáo hóa học: " Fast Motion Estimation and Intermode Selection for H.264" pptx
... in LH, HL, and HH bands, respectively The test of homogeneity hypothesis is as follows Let X = {x0 , x1 , x2 , x3 , x4 } be the feature vector for hypothesis testing, where x0 and x1 are the horizontal ... horizontal and vertical elements of the motion vector in the LL band, x2 is the sum of the amplitude of the coefficients in the LH band (representing the horizontal edge information), x3 is the sum of the ... amplitude of the coefficients in the HL band (representing the vertical edge information), and x4 is the sum of the amplitude of the coefficients in the HH band (representing the diagonal edge information)...
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Báo cáo hóa học: " Optimized H.264/AVC-Based Bit Stream Switching for Mobile Video Streaming" docx
... Stanford University, where he worked on deadline-aware scheduling for wireless video streaming He has published more than 25 conference and journal papers, and has coauthored more than 20 technical ... mode and combining method on bit stream switching Both the selection mode and the combining method used in the scheduler have an influence on the overall performance Thomas Stockhammer et al 15 35 ... this data We believe that this setup is quite suitable to show the potential performance gains achievable with stream switching Figure 10 shows the PSNR versus look-ahead switching points Ns for...
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Adaptive network abstraction layer packetization for low bit rate h 264 AVC video transmission over wireless mobile networks under cross layer optimization
... effects Values higher than indicate that the NALU is required for a drift-free reconstruction, and the higher the value, the higher the impact of a loss of that NALU would be; • forbidden_bit: ... first byte of each NALU is the header byte which indicates the data type of NALU The 1-byte NALU header has three fixed-length bit fields in following formats: 27 Chapter H. 264/ AVC Video Transmission ... hybrid coding”, and digital cinema The ITU-T video coding standards are called recommendations, and they are denoted with H. 26x (e.g., H. 261, H. 262, H. 263, H. 26L and H. 264) The ISO/IEC standards are...
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Tổng quan về chuẩn nén MPEG-4 H.264/AVC và khả năng ứng dụng trong thực tiễn
... ảnh với tỉ số nén + Tách riêng h nh tham khảo h nh hiển thị: tiêu chuẩn trước có phụ thuộc h nh tham khảo h nh hiển thị, H. 264/ AVC mã h a chọn h nh ảnh để tham khảo gần với h nh ảnh mã h a cho ... h nh cáp, Internet TV H. 264/ AVC trở thành tiêu chuẩn cơng nghệ q trình sản xuất, phân phối truy nhập vào h thống Video Mã h H. 264/ AVC ngồi việc quan tâm đến hiệu mã h giống tiêu chuẩn mã h ... tin khối 16x16 pixel thành phần chói khối 8x8 thành phần màu h nh ảnh gốc Một MB bao gồm khối có khối Y, khối Cb Cr h nh vẽ, khối đánh số thứ tự bắt đầu + Mảng (Slice) gồm nhiều MB Kích thước...
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Báo cáo hóa học: " Research Article Subjective Quality Assessment of H.264/AVC Video Streaming with Packet Losses" potx
... differ in their responses to the stimuli The result of the test for both the resolutions indicates that the the null hypothesis cannot be rejected, as a further proof of the fact that the two datasets ... line with the center of the video display at a specified viewing distance, equal to 6–8 H for CIF sequences and to 4–6 H for 4CIF sequences [13], where H denotes the native height of the video ... attention, the content has to be heterogeneous and the test sessions should not last more than 30 minutes each, including any training phase For the same reason, it is important to select stimuli whose...
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Báo cáo hóa học: " Research Article Priority-Based Heading One Detector in H.264/AVC Decoding" pdf
... is pushed to a high position which indicates that only positions 14 and 15 have nearly zero codes distribution However, both intra- and interframes-share the same tendency that the higher the position ... into three parts, each of which handles a different chunk of input bits with varying priority Dec2, which has the highest priority, processes the first two input bits and is active all the time ... one which leads to slight area reduction The only penalty is a small throughput degradation if the heading one happened to be at a higher position like 6, 7, and so forth, because dec2, dec4, and...
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Báo cáo hóa học: " Research Article Efficient MPEG-2 to H.264/AVC Transcoding of Intra-Coded Video" docx
... W1 , and substituting (16) into (11) gives where H and Hinv are the kernel matrices the forward HT transform and inverse HT transform used in the H. 264/ AVC decoding process, respectively, and ... problems The first problem is a transform mismatch, which arises from the fact that MPEG-2 uses a DCT, while H. 264/ AVC uses a low-complexity integer transform, hereinafter referred to as HT Therefore, ... we have shown that with weighting matrices W1 and W2 to compensate for the different norms of HT, inverse HT and H. 264/ AVC quantization design, we can calculate the SSD distortion in the HT domain...
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Báo cáo hóa học: " Robust Transmission of H.264/AVC Streams Using Adaptive Group Slicing and Unequal Error Protection" pptx
... rates The results show that the proposed full scheme is superior to the method in [5] and the other variants of the full scheme When the transmission is error free, the proposed full scheme has ... Research Fellow with the Informatics and Telematics Institute, Centre for Research and Technology Hellas, Thessaloniki, Greece Currently, he is a Postdoctoral Research Fellow with the Informatics and ... networks, channel codes should be used for the efficient protection of the H. 264/ AVC streams To this end, we developed an algorithm for the efficient channel rate allocation This is presented in the ensuing...
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