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High Efficiency Video Coding (HEVC) is the latest video coding standard. It aims to provide significant improvement of compression performance with considerable increment of computational complexity, compared with all exiting video coding standards. In this paper, we propose an adaptive CU depth selection mechanism (ACDSM) for inter mode decision. To avoid unnecessary CU partition by rate distortion...
As the successor to H.264/AVC, High Efficiency Video Coding (HEVC) will provide 50% reduction on compression data compared to H.264/AVC. In this paper, we propose an intra prediction method based on inpainting algorithms and vector predictor for HEVC. Our method utilizes a combination of two important inpainting algorithms: Laplace partial differential equation (PDE) and total variation (TV) model...
Distributed video coding (DVC) is considered as one promising video coding scheme for Wireless Video Sensor Network (WVSN) due to its high compression efficiency and error resilience functionalities, as well as the low encoding complexity. This paper presents an improved DVC scheme based on the source classification in wavelet domain. In this scheme, the new side information (SI) refinement method...
Distributed video coding (DVC) is considered as one promising video coding scheme for Wireless Video Sensor Network (WVSN) due to its high compression efficiency and error resilience functionalities, as well as the low encoding complexity. In this paper, an improved DVC scheme based on checkerboard pattern splitting for Wyner-Ziv (WZ) frame is presented. In specific, the modified three-dimensional...
This paper presents an improved feedback-assisted low complexity WZVC scheme. The performance of this scheme is improved by two enhancements: an improved mode-based key frame encoding and a 3DRS-assisted (three-dimensional recursive search assisted) motion estimation algorithm for WZ encoding. Experimental results show that our coding scheme can achieve significant gain compared to state-of-the-art...
The side information (SI) generation is a key function in the Wyner-Ziv (WZ) video coding, which plays an important role in determining the performance of the codec. This paper proposes an improved SI generation scheme for wavelet transform based WZ video codec. In specific, we adopt the motion estimation with Kalman filter, by which an optimal estimation of motion vector can be achieved. Simulation...
In Wyner-Ziv video coding (WZVC), the majority of the computational complexity has been shifted from encoder to the decoder in comparison to its conventional video coding technologies. This paper presents a low-complexity frame/block motion activity classification algorithm for WZVC. Improved rate-distortion performance is achieved by adjusting the coding mode of key frame according to the motion...
Side Information (SI) generation is a key function in the DVC decoder, and plays a critical impact on the compression efficiency. This paper proposes an improved side information generation scheme of transform domain distributed video coding considering a novel content-based side information refinement technique, which is performed with the color and texture features to segment the side information...
Distributed video coding (DVC) is a new paradigm in video coding, which is receiving a lot of interests nowadays. Side Information (SI) generation is a key function in the DVC decoder, and plays a key-role in determining the performance of the codec. This paper proposes an improved side information generation scheme, which exploits both spatial and temporal correlations in the sequences. Partially...
H.264/AVC encoder complexity is remarkable mainly due to variable block size motion estimation (ME) and exhaustive rate distortion optimization (RDO). This makes real-time video coding very difficult. In this paper, a novel fast mode decision algorithm for P-slices is presented to reduce the computational load. Based on the temporal and spatial correlation between macroblocks, a four paths prediction...
Through experiments on combinations of coding tools included in H.264/AVC, we obtain an optimal combination of coding tools for the mobile multimedia broadcasting application. Although H.264/AVC has defined several profiles and levels for different applications, the partitions are still imprecise. The mobile communication network is usually with limited bandwidth and different kinds of fading and...
In the scalable video coding extension of H.264 standard, the concept of inter-layer prediction is adopted to reduce the redundancy between the base layers and the enhancement layers. Thus, additional coding modes should be calculated during the macroblock mode decision procedure at the enhancement layers. It increases the computational complexity and may obstruct its practical applications. A fast...
Scene changes and rapid motion may occur anywhere in a sequence. Commonly, the bit rate of these coded sequences fluctuates and the image quality suffers from severe degradation. If the scene changes and the rapid motion are taken into consideration in bit allocation scheme, the fluctuation of both bit rate and image quality will be reduced. In this work, an intra-frame rate-quantization (R-Q) model...
In this paper, we introduce a new implementation of motion-compensated temporal filter (MCTF) based video coder which utilizes rate-distortion optimal wavelet packet transform (RDWP) for some low bit rate video coding application scenarios. Although enhanced MC-EZBC video coder provides good scalability and high coding efficiency at high bit rates, reconstructed video quality will drop rapidly with...
This paper presents a post-processing method to evaluate blockiness in block-based video coding images. We propose three constraints to distinguish block boundaries from real edges and textures in the evaluation algorithm. The evaluation result is then used to tune the de-blocking filter on the frame level.
In this paper, a joint source-channel coding (JSCC) scheme for unequal error protection (UEP) based H.264 over wireless channels is proposed. H.264 coded information is divided into different parts according to their different importance, each part is transmitted differentially based on MIMO-OFDM system by applying unequal number of information bits in channel error- correction code to achieve unequal...
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