High Efficiency Video Coding (HEVC) can significantly improve coding efficiency by using 35 intra prediction modes, which lead to a substantial increase in coding complexity yet. In this paper, a fast intra mode decision method for HEVC based on DCT is proposed. The algorithm estimates the texture direction of the prediction block (PB) by using discrete cosine transform and reduces the number o...

As a next-generation video compression standard, High Efficiency Video Coding (HEVC) achieves enhanced coding performance relative to prior standards such as H.264/AVC. In the new standard, the improved intra prediction plays an important role in bit rate saving. Meanwhile, it also involves significantly increased complexity, due to the adoption of a highly flexible coding unit structure and a ...

Intra-prediction is a widely used technique in intra coding. H.264/AVC adopts rate-distortion optimization (RDO) technique to obtain the best intra prediction, while maximizing visual quality and minimizing the required bit rate. However, the RDO reduces the encoding speed via the exhaustive evaluation of all candidate modes. In this paper, we decrease the encoding time by reducing the number o...

We describe a method that considerably improves the computational behaviour of H.264 Intra-only encoders. Such Intra-only encoders come to use in video-cutting and low-latency video coding where temporal prediction via using Inter-frames is no feasible option. We identify the spatial prediction step as the computational bottleneck in Intraonly encoders. In this step, the encoder tests various m...

In rate−distortion optimized video coding, such as H.264, a macroblock uses either Inter or Intra prediction as its compensation method, which exploits temporal or spatial correlation alternatively for compression. In this paper, analysis and experimental results show that Inter and Intra prediction can be combined to generate a more accurate prediction especially for high definition video. A w...

We present a dictionary learning algorithm which is tailored to the block-based image prediction problem. More precisely, we learn two related sub-dictionaries Ac and At , the first one (Ac) for approximating known samples in a causal neighborhood of the block to be predicted and the other one (At) to approximate the block to be predicted. These two dictionaries are learned so that representati...

A wavelet-based spatially scalable video coding scheme with in-band prediction is investigated. The wavelet decomposition of the video frames is followed by the computation of a blockwise motion compensated prediction for the individual subbands. The shift-invariant overcomplete wavelet transform is exploited to obtain half-pixel motion vector accuracy without the need of interpolation. JPEG 20...

With the increasing usage of multimedia contents and advancement of the communication devices (along with services), there is a heavy demand of an effective multimedia compression protocol. In this regards, H.264 has been proven to be an effective video compression standard; however, its computational complexity associated with out and various other issues has been impediment towards mainstream...

There are abundant intra and inter prediction modes in the AVS video coding standard. Rate distortion optimized mode decision can fully utilize this flexibility to improve the spatio-temporal prediction efficiency and maximize the coding efficiency. However, the implementation complexity is dramatically high due to huge throughput burden. Hardware oriented mode decision algorithm is tailored fo...

This paper presents a theoretical analysis of the coding eeciency of interlaced and progressive formats for intra and prediction error images.