The wide deployment of MPEG-2 video and the extra benefits of the features introduced by the H.264/AVC standard, create a strong need for video transcoding between these standards. In this paper the typical problems for video transcoding between MPEG-2 and H.264/AVC are discussed. One of the most basic problems is the difference between the 8x8 Discrete Cosine Transform as used by MPEG-2, and t...

In this paper, we propose a parallel intra-operation unit and a memory architecture for improving the performance of intraprediction, which utilizes spatial correlation in an image to predict the blocks and contains 17 prediction modes in total. The design is targeted for portable devices applying H.264/AVC decoders. For boosting the performance of the proposed design, we adopt a parallel intra...

The motion vector prediction (MVP) is an important part of video coding. In the original median predictor, if the neighbor blocks of current block are intramode coded, their motion vectors (MVs) will be set to zeros for MVP of current block. This is not very precise for sequences with strong motion. This paper propose an improved motion vector prediction (MVP) scheme for H.264. In the proposed ...

In this article, I summarize recent work from my group directed towards developing an improved model of intra and intermolecular interactions and applying this improved model to the prediction and design of macromolecular structures and interactions. Prediction and design applications can be of great biological interest in their own right, and also provide very stringent and objective tests whi...

This paper describes a technique for performing intra prediction of the chroma planes based on the reconstructed luma plane in the frequency domain. This prediction exploits the fact that while RGB to YUV color conversion has the property that it decorrelates the color planes globally across an image, there is still some correlation locally at the block level. Previous proposals compute a linea...

We investigate the encoding speed improvement for H.264 with a special focus on fast intra-prediction mode selection in this work. It is possible to adopt the rate-distortion (RD) optimized mode in H.264 to maximize the coding gain at the cost of a very high computational complexity. To reduce the complexity associated with the intra-prediction mode selection, we propose a two-step fast algorit...

Motion estimation is the most important module in H.264 video encoding algorithm since it offer the best compression ratio compared to intra prediction and entropy encoding. However, using the allowed features for inter prediction such as variable block size matching, multi-reference frames and fractional pel search needs a lot of computation cycles. For this purpose, we propose in this paper a...

The H.264/AVC (Advanced Video Codec) is the latest standard for video coding established by the Joint Video Team ITU-T VCEG and ISO/IEC MPEG (Wiegand et al., 2003) (Sühring, 2010) (Links, 2010). This standard has many innovations, such as hybrid prediction/transform coding of intra frames and integer transforms (Richardson, 2004). Fig. 1 presents a simplified block diagram of the H.264/AVC enco...

There is greater possibility that reversible video data hiding scheme causes more distortions than reversible image data hiding. In H.264/AVC video streams, intraframe distortion drift is a big problem in data hiding. This paper proposes a novel readable reversible data hiding scheme in H.264/AVC which can avert the distortion drift. We embed data into the quantized discrete cosine transform (D...

H.264/AVC High 4:4:4 Intra/Predictive profiles supports RGB 4:4:4 sequences for high fidelity video. RGB color planes rather than YCbCr color planes are preferred by high-fidelity video applications such as digital cinema, medical imaging, and UHDTV. Several RGB coding tools have therefore been developed to improve the coding efficiency of RGB video. In this paper, we propose a new method to ex...