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As the successor of H.264, High Efficient Video Coding (HEVC) standard includes various novel techniques, including Coding Tree Unit (CTU) structure and additional angular modes used in intra coding. These new techniques promote the coding efficiency on one hand, while increasing the computational complexity significantly on the other hand. In this paper, we propose a fast intra block partitioning...
This paper proposes a fast intra prediction algorithm for the High Efficiency Video Coding (HEVC). HEVC has 35 modes, such as DC mode, Planar mode, and 33 angular modes for the intra-prediction. To reduce the complexity and to support fast decision for intra prediction, this paper proposes a hierarchical mode decision method (HMD). The proposed HMD mainly focuses on how to reduce the number of prediction...
High efficiency video coding (HEVC) achieves a better coding efficiency compared with previous video coding standards. To enhance the intra coding efficiency, HEVC employs flexible coding unit structure as prediction unit (PU) sizes which are defined from 4×4 to 64×64 and plenty of prediction modes. These new features of intra prediction in HEVC improves coding efficiency, meanwhile, brings high computational...
High Efficiency Video Coding (HEVC) has recently been standardized with a significant improvement of coding efficiency compared to its preceding video coding standards. To achieve high coding efficiency improvements, HEVC adopts deeper hierarchical block coding structures of coding unit (CU), prediction unit (PU) and transform unit (TU), to better adapt the complex texture and motion natures of various...
Rate control plays an important role in H.264/AVC video coding standard. For the frame layer rate control, since the estimated values of quantization parameter (QP) of the initial frame vary from the image complexity, this paper firstly proposes an improved method for the initial QP estimation to make it more accurate. For the macro block (MB) layer rate control, an improved MB layer rate control...
Intra coding algorithm in High Efficiency Video Coding employs up to 35 directional prediction modes. Upon the end of alleviating the intra encoding complexity, we proposed the candidate mode selection algorithm from analyzing the textures of the source image block. Considering the fine difference between the neighboring prediction directions, we devise the fix-point arithmetic based edge detector,...
An efficient and accurate R-Q model is greatly important for intra-frame rate control of the latest High Efficiency Video Coding (HEVC) standard. However, previous methods pay more attention to the gradient based rate quantization (R-Q) model for the intra-frame rate control. In this paper, we analyze the drawbacks of the gradient based frame complexity measure when applied different Quantization...
State-of-the-art video compression technologies, such as MPEG-4 AVC/H.264 or the new HEVC standard being developed by ISO MPEG and ITU-T VCEG, make use of tree-structured block partitioning for motion compensation. Such motion partitioning only captures horizontal and vertical motion boundaries. To better match actual motion frontiers, Geometry adaptive block partitioning (GEO) has been explored for...
For image and video compression standards, one image is divided into a serial of non-overlapped blocks. Detecting edge existence and analyzing the edge direction in a block level is useful in the applications, such as perceptually improved coding, MB encoding mode decision, blocking artifacts reduction, content-based retrieval, senses changing detection, etc. This paper proposes a novel Fast Block...
Detecting edge existence and analyzing the edge direction in a block level is useful in the applications, such as perceptually improved image processing, blocking artifacts reduction, content-based retrieval, senses changing detection, etc. This paper proposes a novel Fast Block Edge Direction Analysis method. The method is derived from a simple pixel domain in a deductive way. Then we demonstrate...
An efficient I-frame R-Q model is still needed by the rate control in the latest H.264/AVC video coding standard. Some recent works introduced the gradient-based image complexity measure into the frame-layer intra rate estimation in H.264/AVC, but the issue at the macroblock layer was not discussed. We propose a new edge-based complexity measure for this bit rate estimation problem at both the frame-layer...
One fast inter mode decision algorithm is proposed in this paper. The whole algorithm is convoluted with block matching process. Firstly, before ME process, by exploiting spatial and temporal information, a skip mode early detection algorithm is proposed. Also, in this stage, edge gradient is used to filter out unpromising modes. Secondly, during the ME stage, the original search window is separated...
In order to reduce the blocking artifacts in the video frames, H.264/AVC introduces an in-loop de-blocking filter technique. The main drawback of the filter is its high computational complexity. The determination of Bs consumed the most computational resource, because there were five Bs types for every edge to choose. So in this paper we proposed an optimized method that classified edges into 3 types...
H.264/AVC intra prediction employs the rate distortion optimization (RDO) technique to get to the best encoding performance. But exhaustively searching all candidate modes dramatically increases the computational complexity for encoding. In order to reduce the computational complexity, in this work, we proposed a low complexity mode decision algorithm which is based on reducing the number of candidate...
Video identification or copy detection is a challenging problem and is becoming increasingly important with the growing popularity of online video services. The problem addressed in this paper is the identification of a given video clip in a given set of videos. For a given query video, the system returns all the instance of the video in the data set. This identification system uses video signatures...
H.264/AVC uses variable block size motion estimation (VBS-ME) to improve coding gain. However, its complexity is significant and fixed regardless of the required quality or of the scene characteristics. In this paper, we propose an adaptive complexity algorithm based on using the Walsh Hadamard transform (WHT). VBS automatic partition and skip mode detection algorithms also are proposed. Experimental...
The rate-distortion optimization framework employed in H.264 for the selection of best coding mode is computationally expensive, although it achieves remarkable coding efficiency. In this paper, an integrated intra prediction algorithm for intra-frame coding of the H.264 high profile is proposed. It consists of two components: a variance-based method for macroblock mode decision and an improved filter-based...
One of the latest extensions for H.264 video coding standard is the multiview video coding (MVC), which can achieve excellent coding efficiency by not only inheriting from H.264 video standard but also incorporating new tools for interview prediction on the multi-view video sequences. A new prediction mode, motion skip mode, was considered for interview prediction as part of MVC. Motion skip mode...
The MPEG-4 H.264/AVC video coding standard adopts variable block sizes for inter frame coding to increase compression efficiency. However, to achieve this, the H.264 encoder employs a complex mode decision technique based on rate-distortion optimization (RDO) that requires high computational complexity, which significantly increases the encoder complexity. This paper proposes a fast hierarchal cross...
In this paper, we propose a blind geometric warping-based watermarking for images and videos. We put emphasis on high robustness and security as well as decreased complexity. Our previous works have shown that the geometric structure of images and videos is a suitable embedding domain for watermark information. To describe the geometric structure, detection or segmentation methods are used, which...
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