Seyoon Jeong

Adaptive Coding Unit early termination algorithm for HEVC

In this paper, an efficient Coding Unit (CU) early termination algorithm to reduce encoding time of HEVC test model (HM) is proposed. HEVC is the next generation video codec under standardization. There are many sizes of CUs and most of time-consuming procedures are including in CU encoding. It causes high degree of computational complexity. To reduce this computational burden, early CU termination method is proposed based on average rate-distortion cost of previous skipped CUs. The performance of the proposed algorithm is verified through comparative analysis of encoding time and BD-rate.

An effective method for combining multiple features of image retrieval

We propose an image retrieval system using the Borda count method in combining multiple experts (CME). It combines color-, shape- and texture-based retrieval systems. CME method can complementarily combine results of each retrieval system, which uses different features. There are some problems when the Borda count method in pattern recognition is applied to image retrieval. Thus, we propose a modified Borda count method to solve these problems. In the experiment our method reduces false positive errors and produces better results than that of each retrieval module that uses only one feature.

Fast encoding algorithm for high-efficiency video coding (HEVC) system based on spatio-temporal correlation

AbstractVideo compression technology is an importa nt research part to the intelligent user interface for interactive multimedia system using technologies and services such as image processing, pattern recognition, computer vision and cloud computing service. Recently, high-efficiency video coding (HEVC) has been established as the demand of very high-quality multimedia service like ultrahigh definition video service. High-efficiency video coding (HEVC) standard has three units such as coding unit (CU), prediction unit (PU) and transform unit. It has too many complexities to improve coding performance. We propose a fast algorithm which can be possible to apply for both CU and PU parts. To reduce the computational complexity, we propose CU splitting algorithm based on rate–distortion cost of CU about the parent and current levels to terminate the CU decision early. In terms of PU, we develop fast PU decision based on spatio-temporal and depth correlation for PU level. Finally, experimental results show that our algorithm provides a significant time reduction for encoding with a small loss in video quality, compared to the original HEVC Test Model (HM) version 10.0 software and the previous algorithm.

An efficient bi-prediction algorithm for HEVC

In this paper, an efficient bi-prediction algorithm to reduce encoding time of HEVC is proposed. HEVC is the next generation video codec under standardization. The proposed bi-prediction method is a kind of bi-prediction skip algorithm. The proposed method can find the favorable condition of bi-prediction compare to forward (list0) and backward (list1) prediction. Therefore, the bi-prediction is conducted under the favorable condition.

Efficient video images retrieval by using local co-occurrence matrix texture features and normalised correlation

Since multimedia data is widely used in many fields, research is needed on how to search that data. As a method of retrieving multimedia data, especially for image data, content based image retrieval (CBIR) systems have obtained lots of interest. In order to develop CBIR systems, many different properties of an image have been considered for methods of retrieving image data such as colour, texture, shape, etc. The paper proposes a simple and efficient image retrieval algorithm, which retrieves images on the basis of subregional texture characteristics. In order to retrieve images in terms of contents, it is in general required to obtain a precise segmentation. However, it is very difficult and takes a lot of computing time for precise segmentation. Therefore, the proposed algorithm subdivides an image in terms of a certain sized windows, and finds out whether an image contains a query pattern on the basis texture features. Also, these texture features are described by only six different texture features produced from a co-occurrence matrix. For an image retrieval system, a normalised correlation is adopted as a similarity function, which is not dependent on the range of texture feature values. Finally, the proposed algorithm is applied to various images and produces competitive results.

Fast intra mode decision algorithm based on local binary patterns in High Efficiency Video Coding (HEVC)

A fast intra-mode decision algorithm for High Efficiency Video Coding Range Extension (HEVC RExt) is presented. In the HEVC RExt encoder, the encoding performance of intra-coding is better than the previous HEVC still image encoding standard. In order to use textural information of the most probable mode for intra-prediction, the probability distribution of local binary patterns is analyzed. An intra-mode decision method is proposed based on use of the local binary pattern in the texture of an encoded block. Experimental results achieved a 14.59%, on average, time-saving, and a 0.69% and a 0.19 dB loss for bit-rate and PSNR, respectively.

Rate-distortion optimized adaptive transform coding

We propose a rate-distortion optimized transform coding method that adaptively employs either integer cosine transform that is an integer-approximated version of discrete cosine transform (DCT) or integer sine transform (IST) in a rate-distortion sense. The DCT that has been adopted in most video-coding standards is known as a suboptimal substitute for the Karhunen-Loeve transform. However, according to the correlation of a signal, an alternative transform can achieve higher coding efficiency. We introduce a discrete sine transform (DST) that achieves the high-energy compactness in a correlation coefficient range of −0.5 to 0.5 and is applied to the current design of H.264/AVC (advanced video coding). Moreover, to avoid the encoder and decoder mismatch and make the implementation simple, an IST that is an integer-approximated version of the DST is developed. The experimental results show that the proposed method achieves a Bjontegaard Delta-RATE gain up to 5.49% compared to Joint model 11.0.

Development of fixed and mobile hybrid 3DTV for next generation terrestrial DTV

This paper presents DVB-T2 fixed and mobile hybrid 3DTV system design and implementation for DVB-T2 terrestrial 3DTV broadcasting services. The proposed system transmits AVC encoded base view video through HD main channel (DVB-T2 Base, 256-QAM) and AVC encoded additional view video through mobile/handheld service channel (More robust channel, for example T2-Lite or NGH, QPSK or 16-QAM) simultaneously, Basically the proposed system could support stereoscopic 3D HD services by mixed quality base/additional view images for 3D image rendering with disparity compensation post image processing technology. In this paper, we propose DVB-T2 & T2-Lite/NGH hybrid 3DTV system which is support stereoscopic HD quality 3D service system which is allowed maximum channel bandwidth efficiencies & extended service functionalities as well as fully backward compatible with current DVB-T2/T2-Lite and NGH standard.

New Intra Coding Scheme for Improving Video Coding Efficiency

H.264/AVC significantly outperforms the previous video coding standards with many new coding tools. Among these tools, several intra-block coding tools can particularly improve coding efficiency. For intra prediction, H.264/AVC supports most probable mode in the entropy coding process to reduce syntax elements indicating intra prediction modes and most probable mode selection ratio is very high. Also, in general, natural images and videos have many homogeneous regions whose high correlation with neighbouring blocks. In this paper, we propose intra prediction mode SKIP mode using decoder-side prediction to improve the coding efficiency. The proposed method is determined the optimal prediction mode using only neighbouring blocks information and coded on the basis of the conventional prediction/transform coding. And the prediction modes are not send to decoder at all. Skipped intra prediction mode is determined by decoder. Experimental results show that the proposed method achieves coding gains of 1.40% for common intermediate format(CIF), 3.24% for 720p sequences against the H.264/AVC JM 17.0 reference software.

Bandwidth-efficient stereoscopic 3D broadcasting system utilizing mobile broadcast networks

In this paper, we propose a bandwidth-efficient stereoscopic 3D broadcasting system named Service Compatible 3D-TV using Main and Mobile Hybrid Delivery (SC-MMH), which incor-porates fixed and mobile broadcasting services to provide 3D service without allocating additional bandwidth. By combining two existing broadcast networks, the proposed system provides high quality 3D services, fully guarantees backward-compatibility with the legacy fixed/mobile 2D receivers, and maximizes the channel efficiency. System structure of the proposed system and the objective evaluation that we conducted to find the optimum bitrate distribution are presented in this paper.