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Video communication at very low bit-rates has made significant progress recently through the new ITU-T standard H.263. In this paper, we are reviewing the performance advances over the 1990 ITU-T standard H.261, and present a novel extension that allows robust transmission of moving video over highly unreliable channels, such as the mobile channel.
In this paper, an error concealment method for transmission of 3D video in color+depth dual stream format is proposed. Exploiting the correlation between 2D color video and its corresponding depth information, recovery of the lost information of one kind (color/depth) can be achieved with the aid of received information from the other kind (depth/color), thus getting better concealed results than...
In this paper., we propose an efficient temporal DIRECT mode decision algorithm for H.264/AVC inter bi-predictive (B) frame video coding to improve the coding efficiency. In the suggested technique, in addition to the motion vector (MV) of the co-located block we also employ MVs of eight neighboring blocks for DIRECT mode decision. The best MV is selected for DIRECT mode decision based upon the sum...
Inter-prediction based on block-based motion estimation (ME) is used in most video codecs. The closer the prediction to the target block, the lower the residual, and thus more efficient compression can be achieved. In this paper, a new technique called enhanced inter-prediction (EIP) is proposed to improve the prediction candidates using an additional transformation acting while performing ME. A parametric...
Background modeling is an important pre-processing step for object detection in surveillance video analysis systems. Recently, it has been proved to be useful for high-efficiency surveillance video coding. In existing works, the modeling background frame often needs to be high-quality encoded so as to achieve a large bit-rate saving. However, the high-quality background frame requires lots of bits...
In 3D video coding, the Multi-View Video plus Depth (MVD) representation format enables the interpolation of virtual intermediate views in between the original recorded camera views, as well as the extrapolation of views outside this range using view synthesis algorithms. For this, MVD includes depth maps as additional information to be transmitted. The performance of the associated depth data coding...
The Multi-view Video Coding (MVC) standard was developed for efficient encoding of multi-view videos. Part of it requires the calculation of both disparity and motion estimations using a bi-prediction structure. These estimations involve an exhaustive search for the optimal compensation vectors from multiple forward and backward reference frames which, while being very efficient in terms of compression,...
To reduce the complexity of searching for wedge-based geometry partitions in video coding, we propose a texture-difference based partition line selection approach with a skipping strategy. Applying this approach can reduce the encoding time by 90% while retaining the similar rate-distortion performance to that of exhaustive searching. We also propose a background-compensated prediction scheme to improve...
In this paper, a texture-space geometry partitioning approach is proposed to reduce the computational complexity of searching for geometry partitions for video coding. Additionally, for systems that capture both video and depth data, an enhanced geometry partitioning approach using both texture and depth information is proposed to further improve the partitioning accuracy and reduce the search complexity...
In the literature, most motion compensated frame interpolation (MCFI) methods for frame rate up conversion are performed at the decoder side. To reduce computational complexity of the decoder and improve visual quality of interpolated frames, this paper proposes an advanced MCFI (AMCFI) algorithm which uses skipped frame information to select weight and motion vector for MCFI. The weight and motion...
Compared to simulcast, the utilization of inter-view prediction at key pictures can dramatically improve the compression efficiency of multiview video coding (MVC). The reconstructed key picture in previous adjacent view is used as the inter-view reference picture of the key picture in the current coding view. The efficiency of inter-view prediction may deteriorate due to the existence of mismatch...
Multi-view Video Coding (MVC) employs both motion and disparity estimation within the encoding process. These provide a significant increase in coding efficiency at the expense of a substantial increase in computational requirements. This paper presents a fast motion and disparity estimation technique that utilizes the multi-view geometry together with the depth information and the corresponding encoded...
An efficient error protection scheme is proposed for video delivery over lossy channels. Flexible Macroblock Ordering is used to generate spatial descriptions that are sent over disjoint paths. Additionally, descriptions are partitioned to allow unequal error protection against burst errors. Experimental results show that a significant quality gain can be achieved (up to 3 dB) in the presence of burst...
In this paper we propose a novel method of improving the video coding efficiency. Our method combines the shot cut detection and adaptive GOP structure. We have analyzed different approaches for shot cut detection with aim to choose the most appropriate one. The next step is to situate I frames to the positions of detected cuts during the process of video encoding. Finally the efficiency of the proposed...
Inter-picture prediction uses a local decoded picture for the reference, in order to avoid a mismatch between encoding and decoding. However, this scheme does not necessarily result in optimal coding efficiency since it requires encoding the processing altogether. Therefore, we study the use of the original picture as the reference. In this case, although the mismatch causes degradation of the picture...
Multi-view video coding exploits inter-view redundancies to compress the video streams and their associated depth information. These techniques utilize disparity estimation techniques to obtain disparity vectors (DVs) across different views. However, these methods contribute to the majority of the computational power needed for multi-view video encoding. This paper proposes a solution for fast disparity...
As standard video encoder techniques have matured, their rate of improvement has slowed. Greater improvements are possible with purely new coding techniques; however, these are incompatible with conventional methods. As an alternative, a new coding concept with semi-compatibility has been proposed, and an enhancement to I-pictures efficiency has been discussed. This applied method reduces the quantization...
Hierarchical B-Frames (HBF) has emerged as an efficient video coding tool in recent years. As shown in the literature, this approach results in excellent PSNR gains of >;1 dB. However these PSNR gains are not sufficiently assessed in a scientific manner by subjective tests. Hence in this paper, we evaluate HBF coding pattern subjectively by using the MUSHRA test methodology. While MUSHRA is well...
In this paper, an adaptive color transform for image compression is introduced. In each block of the image coefficients of the color transform are determined from the previously compressed neighboring blocks using weighted sums of the RGB pixel values, making the transform block-specific. There is no need to transmit or store the transform coefficients because they are estimated from previous blocks...
Statistical methodologies are the main tools used in video compression and this lead to a kind of stagnation in terms of performance. This means that solutions for increasing the visual performance of video compression have to come from other fields like the perception. One can notice that coding errors in highly textured areas are relatively less perceptible than errors in untextured ones because...
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