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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...
Recently, business in digital content has grown at a rapid pace, and a variety of services and environments that carry music and video content have been established. Various distribution services, such as DVD distribution and streaming distribution services over the Internet, have been started. Businesses that handle high-quality video are growing. However, these businesses are incurring increasing...
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...
This paper proposed a whole new design for RV40(realvideo40) video decoder from FFmpeg(fast forward Moving Picture Experts Group),which is in lack of the ability to decode smoothly when decoding a period of high bit rate frames within some video streams. The design specially optimized the sub pixel interpolation algorithm, which is the core of motion compensation. The design uses detailed, different...
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...
A method of design and implementation of watermarking copyright protection program based on MPEG-4 bit stream is proposed in this paper. The selected DCT coefficients are changed little to meet the specific relationship and represent one bit information. The watermark information is embedded in IVOP color quantized DCT DC coefficient. Not only video spectrum distribution is obtain without the additional...
In this paper we propose an efficient, low power algorithm and its co-designed VLSI architecture for fractional-pel motion estimation (FME) in H.264/AVC. Our fractional-pel motion estimator uses a simplified FIR filter for half-pel interpolation. Usage of this filter reduces the required number of computations and the memory size and bandwidth for half-pel interpolation. Our simulations compare our...
This paper presents ultra low power implementation of eight-point 2-D DCT (Discrete Cosine Transform) based on a Loeffler DCT scheme. The proposed implementation scheme does not require any multiplier as well as scaling compensation in the computation. The constant coefficient in the rotation blocks are represented in CSD (Canonic Signed Digit) and the multiplication is approximated by shift and add...
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...
In 3D video transmission, the depth map is normally compressed by resolution reduction to save bandwidth. The lost information in resolution reduction is recovered by an appropriate upsampling algorithm in decoding step. Most previous work considers the depth upsampling problem as common 2D map upsampling problem and do not take the intrinsic property of depth map into consideration. In this paper,...
This paper proposes a Sub-block Combination Fractional Motion Estimation (SCFME) algorithm for the H.264/AVC video encoder. Fractional Motion Estimation (FME) performs interpolation for the overlapped pixels which increases the computational complexity. The proposed sub-block combination algorithm can reduce the computational complexity by eliminating the overlapped pixel interpolation. Compared with...
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...
To improve compression capacity, motion compensation (MC) is utilized in H.264, which includes 6-tap FIR for 1/2-pel interpolation and 2-tap filter for 1/4-pel interpolation. MC uses up most decoding time, and is the expensive part of H.264 decoder. Some consumer electronics, such as smartphones, may not have enough processing capability to decode high definition video program in real time. MC must...
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...
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