By Topic
Skip to Results

Search Results

You searched for: H.264
4,798 Results returned
Skip to Results
  • Save this Search
  • Download Citations Disabled
  • Save To Project
  • Email
  • Print
  • Export Results
  • Full text access may be available. Click article title to sign in or learn about subscription options.

    Human mobile-device interaction on HEVC and H.264 subjective evaluation for video use in mobile environment

    Garcia, R. ; Kalva, H.
    Consumer Electronics (ICCE), 2013 IEEE International Conference on

    DOI: 10.1109/ICCE.2013.6487051
    Publication Year: 2013 , Page(s): 639 - 640
    Cited by:  Papers (1)

    IEEE Conference Publications

    High Efficiency Video Coding (HEVC) is the next coding standard that is being finalized by ITU's Joint Collaborative Team on Video Coding (JCT-VC). This paper compares the H.264/AVC, current coding standard, and HEVC (aka H.265) in mobile compute environments. In this study, the focus, within the mobile compute environment, are smart phones. The major smart phone elements are smaller screen size, which is typically 3.5 inches diagonal to 5.0 inches diagonal for high end smart phones and typical cellular network bandwidth, which is typically 3G or faster. There is compelling subjective test feedback that indicates human device interaction focused on user's experience is very similar between HEVC and H.264 encoding standards for mobile environment screen size and higher cellphone bandwidth (such as 400kbps constant bit rate). This suggests the benefits of HEVC over H.264 in mobile environment are not as clear. View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    Review on the latest H.264 motion estimation techniques

    Juri, A.A. ; Jambek, A.B.
    Electronic Devices, Systems and Applications (ICEDSA), 2011 International Conference on

    DOI: 10.1109/ICEDSA.2011.5959075
    Publication Year: 2011 , Page(s): 199 - 202

    IEEE Conference Publications

    Motion estimation is the most time consuming part in the H.264 video coding standard. However, this part is vital where it determines the quality and speed of an encoding process. The UMHexagonS algorithm has been adopted for H.264 fast search algorithm to overcome the problem on encoding speed. In thorough study on the UMHexagonS algorithm, there are numerous methods to improve the UMHexagonS speed whilst maintaining the quality of the encoding process. This paper reviews several techniques that can be implemented in each step in the UMHexagonS algorithm. The results show that the UMHexagonS performance can be improved further by 1.06% to 17.31% whilst maintaining good image quality. View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    A Method of H.264-Based Still Stereoscopic Pictures Compression

    Lei Yang ; Xiaowei Song ; Chunping Hou ; Jufeng Dai
    Electrical and Computer Engineering, 2006. CCECE '06. Canadian Conference on

    DOI: 10.1109/CCECE.2006.277359
    Publication Year: 2006 , Page(s): 306 - 309

    IEEE Conference Publications

    Still stereoscopic pictures compression is an important part of auto-stereoscopic techniques. H.264 is an advanced video compression standard, absorbing the advantages of the previous standards. In this paper, still stereoscopic pictures compression is studied, and H.264 coding tools adopted to achieve this compression are discussed. The still stereoscopic pictures compression schemes based on H.264, MPEG-2 and JPEG are compared by the experiments. The experimental results show that with the H.264 compression scheme presented by this paper, high compression rate can be achieved, high quality compressed multi stereo pairs can be acquired and the exact binocular disparities between multi stereo pairs are well preserved View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    Research on fast block partition mode selection algorithm in H.264

    Jianjun Guo ; Kui Dai ; Yun Cheng ; Zhiying Wang
    Computer and Information Science, 2005. Fourth Annual ACIS International Conference on

    DOI: 10.1109/ICIS.2005.109
    Publication Year: 2005 , Page(s): 111 - 113

    IEEE Conference Publications

    The variable block size motion compensation using multiple reference frames is one of the key technologies to provide notable performance gain in H.264. However it is also the main bottleneck that increases the overall computational complexity. For this reason, based on some test results, this paper proposes a new biased fast mode decision method for H.264 video coding standard. Experimental results indicate that this method can speed up the H.264 encoder efficiently without noticeable loss in quality. View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    Novel target bit rate estimation for improved frame level H.264 rate control

    Malewar, A. ; Singh, R.K. ; Gadre, V.
    Signal Processing and Communications (SPCOM), 2010 International Conference on

    DOI: 10.1109/SPCOM.2010.5560500
    Publication Year: 2010 , Page(s): 1 - 5

    IEEE Conference Publications

    An improved rate control scheme with better buffer level tracking and more accurate target bits prediction for H.264 video encoding, is proposed in this work. Compared to the existing H.264 rate control scheme, our scheme gives better buffer regulation with improved PSNR for frame level rate control. The bits required for encoding header information account for a significantly high percentage of the total bits, especially at lower bit rate. The proposed prediction scheme, estimates the number of header and texture bits by using statistics from INTER16×16 mode decision process. The estimated bits are then used for modifying the Quantization Parameter (QP) for better target matching. The experimental results show that the proposed improvement in rate control algorithm significantly reduces the difference in actual and target buffer level while improving the quality of encoded video sequences. View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    L1-norm minimization in pixel recovery for H.264 video transmission

    Ting-Lan Lin ; Chang-Yi Fan ; Gui-Xiang Huang ; Wen-Chih Chen
    Intelligent Signal Processing and Communications Systems (ISPACS), 2012 International Symposium on

    DOI: 10.1109/ISPACS.2012.6473500
    Publication Year: 2012 , Page(s): 302 - 307

    IEEE Conference Publications

    We consider an application of sparse optimization in the error concealment area. State-of-the-art spatial and temporal error concealment method is improved and compared. By solving for limited numbers of significant predictors using the sparse optimization, our algorithm performs subjectively and objective better for the concealed result. View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    Improved Fast Mode Decision Algorithm for Variable Macro Block Motion Compensation in H.264

    Dae-gon Kim ; Cheol-jung Yoo ; Ok-bae Chang ; Eun-mi Kim ; Jong-Ryeol Choi
    Information Technology Convergence, 2007. ISITC 2007. International Symposium on

    DOI: 10.1109/ISITC.2007.66
    Publication Year: 2007 , Page(s): 184 - 187

    IEEE Conference Publications

    H.264 is the latest international video coding standard and it can achieve considerably higher coding efficiency versus previous standards This is accomplished by an enhanced exploitation of the spatiotemporal correlation, such as various macro-block modes, variable block sizes for motion compensation, multiple reference frames, quarter-pixel motion accuracy, and various predictive direction modes for intra prediction. However, although such new encoding technology is the main factor in improving the encoding efficiency, it is simultaneously a highly complex factor. Therefore, the H264 standard is used widely in real applications where the speed elevation of these technologies is essential. The proposed fast motion vector search technique supports the fastest compensation of the variable size block motion that is suitable for the motion vector conclusions which comprise a significant proportion of the encoding complexity in this paper. In addition, a fast-mode decision algorithm capable of deciding various encoding optimal values of H.264 is proposed. Because the proposed fast mode decision algorithm is capable of deciding the mode early, the method enables the omission of the computational procedure of rate-distortion cost and the efficient operation of the motion vector search technique. The results presented here confirmed the achievement of a very high efficiency while decreasing the required number of calculations without incurring any significant encoding damage, thereby improving the existing algorithm by using the information of the surrounding block. View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    Performance evaluation of H.264 video over ad hoc networks based on dual mode IEEE 802.11B/G and EDCA MAC architecture

    Byung Joon Oh ; Chang Wen Chen
    Circuits and Systems, 2008. ISCAS 2008. IEEE International Symposium on

    DOI: 10.1109/ISCAS.2008.4542216
    Publication Year: 2008 , Page(s): 3510 - 3513
    Cited by:  Papers (3)

    IEEE Conference Publications

    We present in this paper the performance evaluation for H.264/AVC video transmission over wireless ad hoc networks. In order to achieve robust video transmission under ad hoc mode, the proposed system not only develops a physical rate based strategy for dual band IEEE 802.11 b/g, but also adopts EDCA MAC layer architecture of IEEE 802.1 le for an improved QoS performance. The dual mode operation allows the ad hoc terminals to move within a larger coverage area while maintaining robust connection via 802.1 lb/g. The adopted EDCA MAC layer architecture enables the prioritized transmission of differentiated video traffic for various ad hoc terminals. We have also developed several network level metrics, including bit rate, packets delay and drop rate, to evaluate the proposed scheme in comparison with simple dual band IEEE 802.11b/g. Simulation results demonstrate that the proposed EDCA-based scheme is able to outperform the simple dual band IEEE 802.1 lb/g with much improved received video quality. View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    A quantitative method for graphical representation of H.264 video content dynamics

    Kourtis, Michail-Alexandros ; Koumaras, Harilaos ; Skianis, Charalampos ; Lazarakis, Fotios
    Telecommunications and Multimedia (TEMU), 2014 International Conference on

    DOI: 10.1109/TEMU.2014.6917732
    Publication Year: 2014 , Page(s): 34 - 39

    IEEE Conference Publications

    This paper presents a method for graphical representation of H.264 video content dynamics, based on the extraction of motion information from the video signal in order to define the content's spatiotemporal dynamics levels. For this purpose, the paper introduces a motion compensation and content residual grid, where each video signal is represented as a point with coordinates that are defined by its motion dynamics and content residual, respectively. The proposed method can be effectively integrated as part of the decision process in video adaptation systems, which perform spatial or temporal (or both) adaptation actions, like MPEG-DASH, in order to optimize the video service delivery. View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    Perceptual Video Coding with H.264

    Minoo, K. ; Nguyen, T.Q.
    Signals, Systems and Computers, 2005. Conference Record of the Thirty-Ninth Asilomar Conference on

    DOI: 10.1109/ACSSC.2005.1599851
    Publication Year: 2005 , Page(s): 741 - 745
    Cited by:  Papers (5)

    IEEE Conference Publications

    In this paper a novel approach to perceptual video coding is presented for block-based video coders. This is done by replacing purely mathematical models for measuring the distortion in video quality, such as mean squared error (MSE) or mean absolute difference (MAD), with a distortion model that measures the perceived distortion by an average human observer. Additionally, to keep the computational complexity of perceptual measurements reasonably low, the suggested model uses the structural properties of the underlying video coder to calculate the suggested perceptual distortion. It's shown that the distortion measure based on the suggested model can be utilized for different rate-distortion optimized video coding techniques such as mode selection and rate control View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    Extension of the DSL coverage area for High Definition IPTV VOD services using H.264 Scalable Video Coding

    Bacquet, A.-S. ; Deknudt, C. ; Corlay, P. ; Gharbi, M. ; Coudoux, F.-X.
    Electronics, Circuits, and Systems (ICECS), 2010 17th IEEE International Conference on

    DOI: 10.1109/ICECS.2010.5724554
    Publication Year: 2010 , Page(s): 483 - 486

    IEEE Conference Publications

    One solution to increase the number of users enjoying High Definition-IPTV services and more particularly Video On Demand (VOD) is to adapt video bitrates to meet the user line bitrate constraint. SNR scalability provided by Scalable Video Coding (SVC) is an easy and reliable way to achieve this goal. In this paper, we propose a global solution to adapt compressed HD SVC bitstreams in order to extend the coverage of IPTV VOD services over the DSL link. The novelty of the presented approach relies on the hybrid combination of SNR scalability and base layer transrating. The proposed solution is designed to optimize the reception video quality for the end-user. Simulation results show that this solution leads to an extension of VOD coverage over DSL link of more than 1000 meters with very satisfying video quality. View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    Process variation aware transcoding for low power H.264 decoding

    Amiri, K. ; Khajeh, A. ; Eltawil, A.M. ; Kurdahi, F.J.
    Embedded Systems for Real-Time Multimedia (ESTIMedia), 2010 8th IEEE Workshop on

    DOI: 10.1109/ESTMED.2010.5666988
    Publication Year: 2010 , Page(s): 90 - 96
    Cited by:  Papers (2)

    IEEE Conference Publications

    Transcoding is commonly used in media servers to adapt video bitstreams to capabilities and specifications of the receiving playback devices or the transmission network channel in between. Primary adjustments are done on the video format, the resolution and the bitrate. In this paper we propose utilizing transcoding as a means of converting a regular standard video bitstream to a standard video bitstream that is also aware of power-reliability characteristics of the target decoder device with main focus on process variabilities within the on-chip decoder reference buffer memory. More specifically we introduce an H.264 video transcoding scheme in which the bitstream generated by transcoder is tolerant to defective SRAM cells that reside in the decoder reference buffer. Such error aware scheme allows for voltage scaling on decoder reference buffer in the presence of process variation and can result in significant power reduction considering the increasing power share of memories on SoCs. Our estimate shows this scheme can manage to realize about 40% power saving on decoder devices (in 32 nm) while preserving the decoded video quality and the bitrate of the bitstream. View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    Hardware oriented content-adaptive fast algorithm for variable block-size integer motion estimation in H.264

    Yu-Han Chen ; Tung-Chien Chen ; Liang-Gee Chen
    Intelligent Signal Processing and Communication Systems, 2005. ISPACS 2005. Proceedings of 2005 International Symposium on

    DOI: 10.1109/ISPACS.2005.1595416
    Publication Year: 2005 , Page(s): 341 - 344
    Cited by:  Papers (6)

    IEEE Conference Publications

    Motion estimation can reduce temporal redundancy and achieve high compression capability in video coding standards. In H.264, the coding gain is further improved by variable block-size motion estimation (VBSME). In order to reduce the complexity, many fast algorithms have been proposed. Though previous works can reduce a large amount of computation, most of them are not suitable for hardware implementation and not robust for complex motion videos. A content-adaptive fast algorithm for variable block-size integer motion estimation (VBSIME) is proposed in this paper. Motion activity is exploited to improve the coding efficiency. Because of the good data reuse scheme and simple control flow, the proposed algorithm is applicable to hardware implementation. According to the simulation results, about 98% searching candidates and 86% encoding time are reduced with at most 0.05 dB quality drop in average compared with full search even for complex motion videos. View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    Improving H.264 performances by quantization of motion vectors

    Corrado, S. ; Agostini, M.A. ; Cagnazzo, M. ; Antonini, M. ; Laroche, G. ; Jung, J.
    Picture Coding Symposium, 2009. PCS 2009

    DOI: 10.1109/PCS.2009.5167401
    Publication Year: 2009 , Page(s): 1 - 4
    Cited by:  Papers (2)

    IEEE Conference Publications

    The coding resources used for motion vectors (MVs) can attain quite high ratios even in the case of efficient video coders like H.264, and this can easily lead to suboptimal rate-distortion performance. In a previous paper, we proposed a new coding mode for H.264 based on the quantization of motion vectors (QMV). We only considered the case of 16 times 16 partitions for motion estimation and compensation. That method allowed us to obtain an improved trade-off in the resource allocation between vectors and coefficients, and to achieve better rate-distortion performances with respect to H.264. In this paper, we build on the proposed QMV coding mode, extending it to the case of macroblock partition into smaller blocks. This issue requires solving some problems mainly related to the motion vector coding. We show how this task can be performed efficiently in our framework, obtaining further improvements over the standard coding technique. View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    The Real Time Video Transmission System Based on H.264

    Zhikao Ren ; Minghua Liu ; Chen Ye ; Hongbo Shao
    Web Information Systems and Mining, 2009. WISM 2009. International Conference on

    DOI: 10.1109/WISM.2009.63
    Publication Year: 2009 , Page(s): 270 - 274
    Cited by:  Papers (1)

    IEEE Conference Publications

    The reliable video transmission is very challenging. Efficient coding and transmission control techniques are required to meet the needs of QoS (quality of service). RTP, a real time transmission protocol, can provide the services of video transmission control. H.264, the latest coding and compression standard from ITU-T, is currently dominating the field by offering a flexible architecture and compression gain of up to 50%. A fast mode decision algorithm for H.264 intra prediction and an adaptive control model of video transmission are presented in this paper. Experimental results shows that the proposed fast algorithm can achieve 30% to 60% computation reduction on aspects of video coding, and the adaptive control method of video transmission can gain good QoS so that the stability and good qualities of video transmission can be ensured. View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    Unequal error protection of H.264 Scalable Video Coding using discrete wavelet transfrom within a lognormal shadowing environment

    Morcos, A. ; Elshabrawy, T.
    Consumer Electronics - Berlin (ICCE-Berlin), 2011 IEEE International Conference on

    DOI: 10.1109/ICCE-Berlin.2011.6031842
    Publication Year: 2011 , Page(s): 66 - 70

    IEEE Conference Publications

    In this paper, Unequal Error Protection (UEP) is applied to a proposed Scalable Video Coding (SVC) amendment to the H.264/AVC standard. The proposed SVC framework uses Discrete Wavelet Transform (DWT) as a hierarchically signal decomposition for multi-resolution analysis and H.264/AVC as a source coding and compression technique. The output streams are divided into four streams with different priorities. UEP is applied in two different dimensions, the first dimension is defined under the video scalability and the second dimension gives higher priority to I-frames over P-frames. UEP is realized using a combination of Hierarchical Quadrature Amplitude Modulation (H-QAM) and Forward Error Correction (FEC) based on Rate Compatible Punctured Convolutional Codes (RCPC). A method to find the optimal selection of parameters for the H-QAM and the rate used by the RCPC is proposed to achieve a certain predefined quality of service based on the received SNR distribution due to lognormal shadowing within the network cell. Simulation results show that the proposed UEP scheme outperforms the Equal Error Protection (EEP) for low SNR values while minimizing as much as possible the loss for higher SNR users and thus achieving a better quality of service. View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    H.264 compressed video classification using Histogram of Oriented Motion Vectors (HOMV)

    Biswas, S. ; Babu, R.V.
    Acoustics, Speech and Signal Processing (ICASSP), 2013 IEEE International Conference on

    DOI: 10.1109/ICASSP.2013.6638012
    Publication Year: 2013 , Page(s): 2040 - 2044
    Cited by:  Papers (2)

    IEEE Conference Publications

    In this paper, we have proposed a simple and effective approach to classify H.264 compressed videos, by capturing orientation information from the motion vectors. Our major contribution involves computing Histogram of Oriented Motion Vectors (HOMV) for overlapping hierarchical Space-Time cubes. The Space-Time cubes selected are partially overlapped. HOMV is found to be very effective to define the motion characteristics of these cubes. We then use Bag of Features (BOF) approach to define the video as histogram of HOMV keywords, obtained using k-means clustering. The video feature, thus computed, is found to be very effective in classifying videos. We demonstrate our results with experiments on two large publicly available video database. View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    A CAVLC embedded method for Audio-Video Synchronization Coding based on H.264

    Xiaoyin Qi ; Mianshu Chen ; Hexin Chen
    Multimedia Technology (ICMT), 2011 International Conference on

    DOI: 10.1109/ICMT.2011.6003016
    Publication Year: 2011 , Page(s): 16 - 19
    Cited by:  Papers (1)

    IEEE Conference Publications

    This paper proposes a new Audio-Video Synchronization Coding algorithm on the latest H.264/AVC video coding standard. The audio information is only embedded into the last non-zero and non-trailing coefficient during the CAVLC (Context Adaptive Variable Length Coding) process and can be extracted from the video stream at the receiver terminal without distortion. This method is efficient with low computational complexity. And the experimental results show that it can arrive synchronization effectively with little stream bit rate increase and quality degradation. View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    Content-adpative H.264 rate control for live screencasting

    Yi Lin ; Weikai Xie ; Lei Jin ; Ruimin Shen
    Visual Communications and Image Processing (VCIP), 2012 IEEE

    DOI: 10.1109/VCIP.2012.6410797
    Publication Year: 2012 , Page(s): 1 - 6

    IEEE Conference Publications

    Live screencasting involves encoding and streaming the screen content of a PC in real-time. Most existing H.264 rate control (RC) algorithms are designed for natural scenes and do not perform well with the quite different signal characteristics of screencasting. This paper proposes a content-adaptive H.264 RC scheme which classifies screen content as “slow-motion” phase or “fast-motion” phase on the fly, based on the temporal and spatial frame-area update pattern of recent frames. Then, for frames in “slow-motion” phase, which usually result from a presenter's GUI operations, a new RC algorithm named Frame Rate Adaptive-CQP (FRA-CQP) is applied, which puts priority on the quality of individual frame rather than the frame rate. For frames in “fast-motion” phase, which usually result from playing a movie during the presentation, the classical CRF+VBV RC algorithm is applied. Evaluation results show this adaptive RC scheme can regularly achieves higher subjective quality assessment score (0.7 to 1.6 points on a 1-5 scale) than existing algorithms while meeting the RC objective. View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    Adaptive Motion Estimation and Mode Decision Strategy for H.264 Encoder

    Hua Wang ; Xiangjun Zhu
    Intelligent Control and Automation, 2006. WCICA 2006. The Sixth World Congress on

    Volume: 2
    DOI: 10.1109/WCICA.2006.1714024
    Publication Year: 2006 , Page(s): 10323 - 10327

    IEEE Conference Publications

    In order to reduce the heavy computation burden of H.264 encoder, an adaptive scheme is proposed to jointly optimize motion estimation and mode decision process. The proposed algorithm utilizes the spatial homogeneity of video object's textures, the motion activity information and the statistical characters on reference frame selection in motion estimation, to effectively skip unnecessary modes and reference frames. Experimental results show that the proposed method achieves a reduction of 40-80% encoding time, with a negligible PSNR loss and bit-rate increase View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    A Multi-stage Fast Intra Mode Decision Algorithm in H.264

    Wang Lu-Lu ; Jia Ke-Bin ; Lu Zhuo-Yi
    Intelligent Information Hiding and Multimedia Signal Processing (IIH-MSP), 2011 Seventh International Conference on

    DOI: 10.1109/IIHMSP.2011.62
    Publication Year: 2011 , Page(s): 236 - 239

    IEEE Conference Publications

    H.264/AVC is a high performance video coding standard with higher compression and better network compatibility, which not only has important theoretical value but also shows wild application prospect. In order to reduce its computational complexity and achieve real-time application requirements, a multi-stage fast intra mode decision algorithm is proposed. In the first stage, we choose the optimal mode from intra 4×4 and intra 16×16 by extracting the spatial features of macro-block using two-dimension histogram, in combination with double-threshold algorithm. In the second stage, the nine prediction directions in intra 4×4 mode are divided into two groups and the optimal group is selected by pre-determination algorithm before coding. Experimental results show that the proposed algorithm reduces the coding time effectively with little degradation of image quality. View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    Fast Interframe Transcoding from H. 264 to MPEG-2

    Moiron, S. ; Faria, S. ; Assuncao, P. ; Silva, V. ; Navarro, A.
    Image Processing, 2007. ICIP 2007. IEEE International Conference on

    Volume: 4
    DOI: 10.1109/ICIP.2007.4379956
    Publication Year: 2007 , Page(s): IV - 69 - IV - 72

    IEEE Conference Publications

    This paper deals with conversion from H.264/AVC (advanced video coding) coded video into the MPEG-2 format. The proposed approach exploits similarities between the coding techniques used in both standards in order to achieve a computationally efficient method for transcoding interframe coded slices. The conversion process is based on adaptation of both coding mode and motion information embedded in the H.264/AVC video stream, such that subsequent MPEG-2 encoding takes full advantage of the higher computational effort spent on the first encoding step. The proposed transcoding scheme significantly reduces the computational complexity needed for MPEG-2 interframe coding by reusing relevant information from the H.264 bitstream. The simulation results show that computational complexity savings up to 60%, with a marginal objective quality cost, can be achieved in comparison with a cascaded decoder-encoder. View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    Modified H.264 intra prediction for compression of video and images captured with a color filter array

    Doutre, C. ; Nasiopoulos, P.
    Image Processing (ICIP), 2009 16th IEEE International Conference on

    DOI: 10.1109/ICIP.2009.5413873
    Publication Year: 2009 , Page(s): 3401 - 3404
    Cited by:  Papers (2)

    IEEE Conference Publications

    Most consumer digital cameras capture color information with a single light sensor and a color filter array (CFA). In these cameras, only one color sample (red, green or blue) is captured at each pixel location. This paper presents a modified H.264 intra prediction scheme for compressing image and video data captured with a color filter array. The H.264 intra prediction modes are modified for the green channel to account for the fact that the green data is not sampled in a rectangular manner in the Bayer pattern, the most popular CFA design. The proposed method increases the compression efficiency of I frames on the green channel by up to 1.2 dB. View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    A Novel 3-D Predict Hexagon Search Algorithm for Fast Block Motion Estimation on H.264 Video Coding

    Tsung-Han Tsai ; Yu-Nan Pan
    Circuits and Systems for Video Technology, IEEE Transactions on

    Volume: 16 , Issue: 12
    DOI: 10.1109/TCSVT.2006.885726
    Publication Year: 2006 , Page(s): 1542 - 1549
    Cited by:  Papers (14)

    IEEE Journals & Magazines

    In the upcoming video coding standard MPEG-4 AVC/JVT/H.264, motion estimation is allowed to use multiple references and multiple block sizes to improve the rate-distortion performance. However, full exhaustive search of all block sizes is computational intensive with complexity increasing linearly to the number of allowed reference frames and block sizes. In block motion estimation, a search pattern with a different shape or size has a very important impact on search speed and distortion performance. Based on an in-depth examination for the influence of search pattern on speed performance, a novel search algorithm, three-dimensional predict hexagon search (3DPHS), is proposed in this paper. The 3DPHS depends on the characteristics of motion vector distribution; it can predict the object movement in horizontal and vertical direction with a novel search pattern. The proposed algorithm also considers the characteristics of multiple reference frames and multiple block sizes in H.264. The analysis results show that the speed improvement of 3DPHS over some popular fast search algorithms is about 25%-75%. The compression quality is almost the same compared with Full Search View full abstract»

  • Full text access may be available. Click article title to sign in or learn about subscription options.

    A novel algorithm to fast mode decision with consideration about video texture in H.264

    Liquan Shen ; Zhi Liu ; Zhaoyang Zhang ; Guozhong Wang
    Computer Systems and Applications, 2007. AICCSA '07. IEEE/ACS International Conference on

    DOI: 10.1109/AICCSA.2007.370705
    Publication Year: 2007 , Page(s): 684 - 687
    Cited by:  Papers (2)

    IEEE Conference Publications

    H.264 employs 7 different size block types for motion estimation that can significantly improve the coding performance compared with the previous video coding standards. However, H.264 requires extremely high computation with the R-D optimized decision since so many prediction modes are used. In this paper, a novel inter mode decision algorithm (NIMDA) is proposed that utilizes SADs of each 4X4 block and texture characteristic to reduce the candidate mode set after the 16 X16 prediction mode is tested. The simulation results show that the proposed algorithm reduces the entire encoding time by 64.52% with only negligible coding loss. View full abstract»

Skip to Results

SEARCH HISTORY

Search History is available using your personal IEEE account.