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The purpose of this paper is to improve allocation of the number of bits without skipping the frame by accurately estimating the target bits in H.264/AVC rate control. In our scheme, we propose an enhancement method of the target frame rate based H.264/AVC bit allocation. The enhancement uses a frame complexity estimation to improve the existing mean absolute difference (MAD) complexity measurement...
Research on error resilience in multi-view coding is currently receiving considerable interest. While there is a multitude of literature concerning error recovery in 2D video, due to the statistical difference in motion compensation among temporal frames and disparity compensation among view points, such methods are inadequate to cater to the requirements of multiview video transmission. This paper...
Scalable Video Coding provides several levels of video encapsulated in a single video stream. In a transmission scenario such as broadcasting, this structure is quite advantageous as it can be used to address heterogeneous decoding targets with variable needs and requirements. However, this adaptability comes at a slight cost in coding efficiency when compared to single-layer coding. Based on subjective...
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...
A rate control (RC) algorithm is a primitive block of video encoders that fulfills the bandwidth and buffer constraints for given channel and application properties. State-of-the-art RC schemes perform inefficient in terms of buffer and quality smoothness when handling varying rate distortion characteristics of different picture types (I, P, B) and different MBs in one picture (e.g. bright, textured,...
The technique of variable block-size motion estimation is employed in the H.264 international video coding standard to obtain better compression performance. However, this technique brings about a lot of increase in the computational complexity and thus is very time-consuming. For this reason, a new fast motion estimation mode decision algorithm is proposed in this paper to reduce the computational...
To decrease the computational complexity of adaptive inter-layer prediction and improve the encoding efficiency in spatial and temporal scalable video coding, a mode decision algorithm is proposed by exploiting the part of used modes in the co-located reference macroblock(s) for Hierarchical-B pictures of all layers. This scheme generates a reduced dynamic candidate list for the current macroblock...
Focusing on 802.16e-based railway networks, our work deals with the degradation of the perceived quality of multimedia communications in presence of handover events. The movement of mobile nodes (MN) across coverage areas of distinct base stations (BS) involves global disconnection periods, which leads to a degradation of the perceived video quality. During this period, video data packets are dropped,...
A fast macroblock mode selection algorithm based on dynamic multi-threshold is proposed to improve the encoding speed of multiview video, but with insignificant degradation in rate distortion (RD) performance. The macroblock modes are divided into four classes after statistically analyzing the macroblock mode selection results. Three thresholds are adopted based on the great RD cost gaps between the...
MPEG coded video may be processed for quality assessment or postprocessed to reduce coding artifacts or transcoded. Utilizing information about the MPEG stream may be useful for these tasks. This paper deals with estimating MPEG parameter information from the decoded video stream without access to the MPEG stream. This may be used in systems and applications where the coded stream is not accessible...
Under the precondition of guaranteeing the compression ratio, in order to improve the quality of the reconstructed image, a fractal image compression method based on block classification and quadtree partition is proposed. Firstly, the image is partitioned through adaptive quadtree method. Then, the subblocks in each level are classified, according to the statistical characteristics of the subblocks...
The H.264 video coding standard has achieved a significant improvement in coding efficiency over previous standards. However, the computational complexity of the H.264 encoder is increased drastically, which results in implementation for the real time applications practically difficult. Motion estimation is one of the modules in H.264 video encoder that requires significant amount of computation,...
AVS-M is a standard for mobile video transmission of AVS series of standards for audio and video compression in China. AVS-M has nine intra prediction modes just as the widely studied H.264. Since H.264 and AVS-M has DCT transform for 4times4 blocks, a similar all zero block detecting for H.264 has also been proposed for AVS-M. However, the technique may not the best one for all zero detection in...
This paper presents an adaptive search range selection based on prediction error and local statistics of the neighboring blocks. The performance, computation, and power consumption of block matching motion estimation algorithms in video coding standards depends on the motion search range. An optimal search range for each block is determined on the basis of motion vectors and prediction errors obtained...
In H.264 encoder system, the power dissipation of inter prediction occupies a quite large part. For low-power and power-aware system design, efficient fast inter prediction algorithms are the significant techniques to reduce the power consumption. In this paper, a system-level power-aware algorithm based on the early termination scheme of H.264 inter prediction is proposed for the power-aware H.264...
In this paper we present a statistical model used to select coding parameters for a mixed resolution Wyner-Ziv framework implemented using the H.264/AVC standard. This paper extends the results of a previous work for the H.263+ case to the H.264/AVC coder, since the parameters need to be recalculated for the H.264 case. The proposed correlation estimation mechanism guides the parameter choice process,...
H.264 is a complex and feature rich standard. Its features have vastly different occurrences rates in typical HD sequences. Design effort as well as system resources should be directed at high occurring features and not wasted on low occurring ones. Profiling experiments are conducted to analyze the statistical characteristics of sequences. Based on the analysis results, implementation strategies...
In this paper we have analyzed possibility of using PSNR (peak signal-to-noise ratio) locally averaged over N successive picture in a video sequence as a simple objective video quality metric. Results of PSNR averaged over different number of pictures (N) are presented and compared with results obtained with standard PSNR and another two objective metrics: VQM (video quality metric) and SSIM (structural...
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