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The use of Flexible Macroblock Ordering (FMO) in H.264/AVC as an error-resilient tool incurs extra overhead bits that reduces coding efficiency at low bit rate. To improve coding efficiency, we present an improved frame-layer H.264/AVC rate control that takes into consideration the effects of using FMO for video transmission. In this paper, we propose a new header bits model, an enhanced frame complexity...
This paper presents a framework for video coding, which is compatible with the existing H.264/AVC standard (for preprocessing). Since the video sequences are of 3D data matrices and the traditional XY image frame plane is not always the best for video coding in terms of rate-distortion (RD) performance, optimal compression plane (OCP) determination models are developed to improve the coding efficiency...
Buffer management is an essential element in rate control to regulate the behavior of the virtual output buffer of video encoder. In this paper, a novel quadratic curve based buffer management (QCBM) method for H.264/AVC rate control is proposed. This method considers the features of video coding and employs a quadratic curve, which is obtained according to the initial buffer fullness, target buffer...
This paper proposes an efficient zero-block inter mode decision algorithm for high bit-rate coding in H.264/AVC, to improve computation efficiency of the previous algorithm [1]. In the proposed algorithm we suggest using zero-blocks of both 8×8 and 4×4 DCT coefficients to describe video sequences in detail, including global and local stationary characteristics. The experimental results reveal that...
H.264/AVC achieved better coding efficiency and visual quality than the previous video coding standards such as H.262, MPEG-1, MPEG-2, H.263 and MPEG-4 part2 at the same bit rate. To achieve the better coding efficiency, H.264/AVC uses the rate distortion optimization technique (RDO). The computational complexity is increased by using RDO calculation in all possible modes of intra prediction. To reduce...
The variable block size motion estimation (ME) and compensation (MC) using multi-reference frames is adopted in H.264/AVC to improve coding efficiency. However, the computational complexity of the ME/MC increases proportional to the number of reference frames. In this paper, we propose a new efficient reference frame selection algorithm to reduce the complexity. The proposed algorithm selects suitable...
The paper proposes a novel algorithm to enhance the quality of H.264/AVC compressed video sequences by using an in-loop spatio-temporal motion compensated filter (MCSTF). Extra information from surrounding coded frames are used together with the information of the current coded frame to reduce the coding artifacts. With the availability of the original frame, the MCSTF coefficients are optimized at...
A new intra-frame coding scheme is proposed for progressive video sequences in H.264/AVC. In the proposed method, every other pixel is sampled either in a horizontal or vertical direction without any anti-aliasing filtering, and two sub-frames of the even-pixel and odd-pixel are then generated. The even-pixel and odd-pixel sub-frames are coded by the intra-and inter-frame coding methods, respectively...
Intra coding has relatively low coding efficiency, however, it is an indispensable coding tool since it provides random access and low-complex encoding. A new intra prediction mode coding scheme is proposed in this paper to improve its coding efficiency. The proposed scheme can save bits used in representing intra prediction mode by selectively not transmitting intra prediction mode bits. If the proposed...
This paper proposes an efficient video coding method which utilizes audio-visual information, based on the observation that sound-emitting regions in a video sequence attract observer's attention. The regions responsible for the sound are identified by an audio-visual source localization algorithm. Then, the result is used for encoding different regions in the scene with different quality in such...
Leaky prediction schemes have been proposed to reduce transmission error propagation by trading off with video coding efficiency. We propose using leaky prediction to improve the robustness of generalized source channel prediction scheme for H.264/AVC in error prone scenarios. We apply leaky prediction selectively at a macroblock level based on a simple mean square error metric in order to reduce...
In this paper we describe a database containing subjective assessment scores relative to 78 video streams encoded with H.264/AVC and corrupted by simulating the transmission over error-prone network. The data has been collected from 40 subjects at the premises of two academic institutions. Our goal is to provide a balanced and comprehensive database to enable reproducible research results in the field...
This paper presents a novel method for the protection of copyrighted multimedia content. The problem of selective encryption (SE) has been addressed along with compression for the state of the art video codec H.264/AVC. SE is performed in the context-based adaptive binary arithmetic coding (CABAC) module of video codec. For this purpose, CABAC is converted to an encryption cipher by scrambling of...
This paper presents results for full and mixed resolution stereo video coding including subjective and objective evaluation for 3DTV on mobile devices. For this, objective as well as subjective tests have been carried out with different sequences at different image sizes and evaluated on two different stereoscopic displays. The subjective tests showed, that for uncoded sequences full resolution was...
In this article we propose an optimization method for encoding low resolution soccer video sequences. The considered video codec is the state of the art H.264/AVC, as recommended by the 3GPP specifications. The proposed optimization aims at maximizing the user perceived quality, considering the characteristic features of soccer videos. In the typical wide angle shots, about one fourth of each frame...
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