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.
In this paper we present a rate control algorithm to control the encoded picture size in a video sequence within a specified maximum limit. The need to control the encoded picture size arises in several video applications; (i) video conferencing to ensure the glass to glass delay is within acceptable conversational delay, (ii) video encoders complying with H.241 MTU packetization constraints to ensure...
H.264/AVC is the newest video coding standard with high compression efficiency. Especially it adopts traveling algorithm to find the optimal mode for intra-frame prediction in spatial field, so it is quite complex and costs very long encoding-time. In this paper, the proposed fast mode decision scheme consists of two parts: early intra mode detection, which is to select intra 4×4 or intra 16×16 mode...
The H.264/AVC multi-view extension provides for high compression ratios of multi-view sequences. The coding scheme used exploits spatial, temporal and inter-view dependability for this scope. However, in the event of transmission errors, this leads to the propagation of the distorted macroblocks, degrading the quality of the video perceived by the user. In this paper we introduce error resilient coding...
Exhaustive mode decision is exploited in multi-view video coding for effectively improving the coding efficiency, but at the expense of yielding higher computational complexity. In this paper, a fast mode decision algorithm, called the mode-correlation-based early termination (MET), is proposed. For each macroblock, the proposed MET algorithm always starts with checking whether the rate-distortion...
A new error concealment technique based on the coding modes is proposed for H.264 video sequences. The motion-compensation modes (i.e., block-partitioning types) of surrounding macroblocks are employed to predict the mode of a lost macroblock. This adaptive selection mechanism is combined with a refined set of candidate motion vectors. Experimental results show that the proposed method, as compared...
The H.264/AVC video coding standard shows high coding efficiency compared to previous video coding standards by applying new coding features. However, due to the exhaustive rate-distortion optimization (RDO) based mode decision process, the computational complexity of the encoder greatly increases. In this paper, a fast mode decision algorithm for spatial direct mode in B slice in H.264 standard is...
In the scalable video coding (SVC) standard, interlayer intra prediction (ILIP) is one of the most fundamental coding tools used to reduce bit rate. The prediction block of macroblock (MB) in enhancement layer (EL) is obtained by upsampling the co-located base layer (BL) block. In this paper, we propose a new ILIP method by introducing the adaptive signal processing techniques. Adaptive Wiener filters,...
Rate distortion (RD) optimization, which is used to decide the best coding mode of a macroblock (MB) in H.264/AVC video coding standard, is a very efficient technique to improve coding performance. On the other hand, this RD optimization process also incurs a considerable complexity increase of the encoder. To reduce computational cost of RD optimization, fast bit estimation method can be adopted...
Conventional motion estimation used in rate-distortion (RD) optimized video coding is formulated for an error-free environment. Special considerations have to be made when transmitting video in lossy networks. In this paper we demonstrate a novel method of weighting the distortion used in RD optimized motion compensated prediction. By determining an appropriate weighting factor, motion vectors are...
With wide use of multimedia applications, there are quite different demands in display resolutions and access bandwidths. There are also more demands in transcoding. At the same time, with being presented of the new video coding standard H.264, there are more high demands in transcoding. We present a fast algorithm based direction in I frame downsizing in H.264. This algorithm can significantly speed...
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.