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Fast mode decision for intra mode prediction in H.264/AVC trades off between rate distortion performance and encoding complexity. Edge direction method has been certified available by reducing unlikely orientation features which are represented by eight values derived from pixel-value processing. In this paper, we proposed a new method to simplify this procedure by exploiting the correlation between...
H.264 introduces a technology of intra-prediction to improve the coding efficiency of I frames, but also greatly increased the computational complexity of encoding. This paper proposes a fast intra- prediction mode selection algorithm. The algorithm predicted macroblock boundaries and the fast intra- prediction mode selection to speed up encoding rate. The result of experiments show that the proposed...
In order to get the best mode, H.264 computes the cost of every mode for each block by RDO (rate distortion optimization) technique, but it increases a high computational complexity .This paper combines Pan's fast algorithm and an efficient fast mode decision for intra prediction is proposed. First, the intra prediction's types are decided by whether a block is smooth. Second, the Pan's fast algorithm...
In this paper, a rate-distortion optimized variable block transform coding scheme is proposed based on a hierarchical structured transform for macroblock (MB) coding with a set of the order-4 and -8 integer cosine transform (ICT) kernels of H.264/AVC as well as a new order-16 ICT kernel. The set of order-4, -8 and -16 ICT kernels are applied for inter-predictive coding in square (4 × 4, 8 × 8 or 16...
The objective of this work is to investigate the performance of a new inloop filter for video compression, which uses temporal rather than spatial information to improve the quality of reference frames used for prediction. The new filter has been integrated into the H.264/AVC baseline encoder and tested on a wide range of sequences. Experimental results show that the filter achieves a bit rate reduction...
We propose a novel video coding scheme targeting Super Hi-Vision (SHV) video sources. While it takes a conventional block-based MC + Transform hybrid coding approach that is suitable for hardware implementation of a SHV video codec, the proposed scheme achieved significant coding efficiency improvement by introducing several coding tools such as intra prediction and adaptive transform. According to...
Inter prediction based on block matching motion estimation is important for video coding. But this method suffers from the additional overhead in data rate representing the motion information that needs to be transmitted to the decoder. To solve this problem, we present an improved implicit motion information inter prediction algorithm for P slice in H.264/AVC based on the spatio-temporal adaptive...
One major obstacle for the application of multiview sequences, including 3DTV, is the extremely large amount of data associated with a multiview sequence. To enable the storage or transmission of a multiview sequence at a reasonable cost, in this paper, we present a disparity estimation method based on affine model to overcome this problem. By modeling the disparity function on each patch of the multiview...
Halftone visual cryptography is an encryption mechanism that a secret image is encoded into halftone shares for showing meaningful images. You only need to superimpose part of these share images. Then, images can be shown the original confidential. In this paper, we propose an encoding scheme to improve the efficiency of visual secret sharing technology. We use the relative location information of...
Motion compensation with quarter-pel accuracy was added to H.264/AVC to improve the coding efficiency of images exhibiting fractional-pel movement. To enlarge the reference pictures, a fixed 6-tap filter is used. However, the values of the filter coefficients are constant regardless of the characteristic of the input video. An improved interpolation filter, called the Adaptive Interpolation Filter...
Depending on the content of a video sequence and the settings used for encoding it, the amount of bits spent for the transmission of motion vector information can be enormous and in some cases even take the largest fraction of the bit rate. This is not always necessary since often wide areas, i.e. background or large foreground regions, fit the same global motion. Additionally, a global motion model...
The objective of this work is to develop a new 3-D video coding system which can provide better coding efficiency with improved subjective quality as compared to existing 3-D video systems. We have analyzed the distortions that occur in rendered views generated using depth image based rendering (DIBR) and classified them in order to evaluate their impact on subjective quality. As a result, we found...
3D scene information can be represented in several ways. In applications based on a (N-)view plus (N-)depth representation, both view and depth data is compressed. In this paper we present a depth compression method containing an depth up-sample filter which uses the color view as prior. Our method of depth down-/up-sampling is able to maintain clear object boundaries in the reconstructed depth maps...
This paper presents an efficient video-on-demand (VOD) scheme for free viewpoint television (FTV), and proposes a data format and its data generation method to provide a walkthrough experience. We employ a hybrid rendering approach to describe a 3D scene using 3D model data for objects and textures. However, conventional hybrid rendering methods such as multi-texturing include excessive redundancy...
A generalization of the fast coding method for efficient data hiding has been proposed. In this way, each secret digit in a prime-base notational system is represented by a series of cover values. Modification on one cover value can be used to embed several secret digits, so that distortion is observably reduced. The original fast coding method can be viewed as a special case of the generalized scheme...
This paper proposes a new intra prediction architecture for high resolution applications. The standard intra prediction has a data dependency for the pipelined processing. To enable the pipelined intra prediction architecture, processing order changing methods and additional processing schedulers are proposed. However, previous methods are not considered for the parallel processing which is a key...
Intra-frame coding is one of the most important technologies in H.264/AVC, which made significant contributions to the enhancement of coding efficiency of H.264/AVC at the cost of computation complexity. To address this problem, in this paper we present an efficient VLSI implementation of a computation efficient intra prediction algorithm for H.264/AVC encoding. Unlike most of existing fast intra-mode...
A low complexity lossless video codec design, which is an extension to the well known CALIC system, is presented. It starts with a reversible color space transform to decorrelate the video signal components. A gradient-adjusted prediction scheme facilitated with an error feedback mechanism follows to obtain the prediction value for each pixel. Finally, an adaptive Golomb-Rice coding scheme in conjunction...
Motion estimation plays an important role in inter-frame prediction for the video coding standards such as H.264/AVC, MPEG-2, MPEG-4, VC-1, and so on. Its huge computation complexity, however, makes it difficult to achieve real-time coding for the HDTV1080p. In this paper, we propose a dynamic search range algorithm which reduces about 80% of search points in full search algorithm for the H.264/AVC...
A novel intra coding scheme is proposed to improve coding performance in intra pictures of H.264/AVC. The proposed method generates two sub-images, which are defined as a sampled image and a prediction error image in this paper, from an original image, and then encodes them separately. Especially, in an intra prediction process of encoding, the sampled image employs the original intra prediction modes,...
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