The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Compressed video bitstream is sensitive to channel errors that may severely degrade the reconstructed pictures. Error concealment techniques implemented at decoders are effective approaches to reduce the impact of errors. They mask the effect of missing blocks by using the spatial or/and temporal correlation to create image or video of subjectively acceptable quality. This paper proposes an adaptive...
This study introduces a video compression method that uses spatio-temporal lifting based algorithms to compress the video signals. The temporal correlation of consecutive frames causes temporal redundancies, which are subject to lifting-like motion predictive compression. Similarly, neighboring pixels are correlated in each frame. A 3D lifting-based method that exploits both of those correlations...
We present in this paper a fast block matching motion estimation algorithm for H.264/AVC coding standard, based on a study of the motion vector (MV) obtained by the predictive diamond searching algorithm among several test sequences. We found that diamond search is fast and robust for most types of sequence. Based on temporal and spatial motion correlation among adjacent blocks in images, we propose...
Based on the statistical analysis of relation between CBP (Coded Block Pattern), MVD (Motion Vector Difference) and each coding mode, a fast mode selection algorithm based on macroblock-adaptive is proposed. In this algorithm, adaptive judgment strategies are adopted to filter partial coding mode quickly. The residual CBP, MVD information is used adequately to identify the relativity of intra and...
In this paper, we propose an efficient and embedded 3-D wavelet video coding algorithm, which exploits inter- and intra-subband correlations along spatial and temporal directions through the use of spatio-temporal orientation trees. The spatio-temporal tree structure has nodes as a block of ntimesn coefficients as a basic unit in contrast to a single coefficient in the 3-D SPIHT. The proposed algorithm...
Block-based motion and disparity compensation are popular techniques to exploit correlation between video frames. Block sizes used for compensation can be chosen to achieve a good trade-off between signaling overhead and prediction accuracy. However, motion field boundaries correspond to objects having arbitrary shapes; this limits the accuracy of block-based compensation, even when small block sizes...
This paper presents a concealment based approach to distributed video coding that uses hybrid key/WZ frames via an FMO type interleaving of macroblocks. Our motivation stems from a previous work of ours that showed promising results relative to the more common approach of splitting the sequence in key and WZ frames. In this paper, we extend our previous scheme to the case of I-B-P frame structures...
Summary form only given. Distributed source coding has emerged as an enabling technology for sensor networks. It refers to the compression of correlated signals captured by different sensors which do not communicate between themselves. Distributed source coding finds its foundation in the seminal work of Slepian-Wolf (1973) and Wyner-Ziv (1976). The proof of the Slepian-Wolf W theorem is based on...
A fast intra-prediction algorithm to determine the coding mode for 4 x 4 blocks is presented. The near pixel-correlation integration approach is proposed to compute the parameter for each mode along the predictive direction. The parameters that can be easily estimated with the simple computation are useful to represent the feature of block mode. On the basis of the fast algorithm, only three to four...
This paper presents a novel scene change detection method using edge direction based on intra prediction mode in H.264/AVC. When scene change occurs, there is less temporal correlation between frames. Therefore, most of macro-blocks are encoded in intra mode. Using this property, the proposed method calculates the percentage of intra mode blocks in each predictive frame in order to get candidates...
In this paper, a fast intra mode decision algorithm for H.264 that exploits the interblock correlation in the intra-mode domain is proposed to reduce computational complexity. Four modes of neighboring coded macroblocks/blocks are considered as the good candidate intra modes of the current block. Experimental results show that the proposed method can efficiently save the computation cost with little...
We revisit the classic problem of developing a spatial correlation model for natural images and video by proposing a conditional correlation model for relatively nearby pixels that is dependent upon four parameters. The conditioning is on local texture and the conditional correlation model is presented for each of the nine 4 by 4 intra-modes used in the AVC/H.264 video coding standard. We use this...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.