Gwangsoon Lee

Development of terrestrial DMB transmission system based on Eureka-147 DAB system

This paper introduces T-DMB transmission system in Korea based on Eureka-147 DAB and presents a new architecture of transmission system for digital multimedia services. For transmission of the digital multimedia contents in mobile environment by using the existing DAB, we developed a T-DMB processor which performs T-DMB encoding and insertion of the media stream into the existing DAB transmission system. After the implemented T-DMB processor can be connected to the front of the commercial Eureka-J47 DAB system, and the performance of the T-DMB system is confirmed through the T-DMB experimental broadcasting in Korea.

System and Services of Terrestrial Digital Multimedia Broadcasting (T-DMB)

Commercial terrestrial digital multimedia broadcasting (T-DMB) service was launched on December 1st, 2005, in the Seoul metropolitan area of the Republic of Korea. As the worlds first commercial terrestrial mobile multimedia broadcasting service, T-DMB garnered huge attention in the field of mobile broadcasting. This paper presents the history, system, and services of T-DMB

Depth-image-based rendering for 3DTV service over T-DMB

In this paper, we present a depth-image-based rendering (DIBR) technique for three-dimensional television (3DTV) service over terrestrial-digital multimedia broadcasting (T-DMB). 3DTV service over T-DMB is very attractive because the single user environment of T-DMB is suitable to glassless 3D viewing. However, the bit budget for the transmission of additional data in 3DTV service is very limited in T-DMB. DIBR can resolve this problem because the depth information as the additional data can be compressed effectively. However, DIBR has also some problems such as the backward compatibility with the conventional T-DMB, a large computational cost for rendering virtual images and generation of holes by disocclusion. To solve these problems, we first present the service architecture for DIBR-based 3DTV service over T-DMB, which can maintain the backward compatibility with the conventional T-DMB. Second, we propose a new depth preprocessing method based on adaptive smoothing. In the proposed depth preprocessing method, two adaptive smoothing filters of the discontinuity-preserving smoothing and the gradient direction-based smoothing are sequentially conducted. As a result, both the reduction of bitrates required for the depth transmission and the reduction of the holes can be achieved. Finally, we present look-up table (LUT)-based simultaneous method for generating an auto-stereoscopic image so that problems of the limited memory and the large computational cost can be resolved in T-DMB player. Various experiments show that the proposed DIBR technique can be efficiently employed for 3DTV service over T-DMB.

3DTV Broadcasting and Distribution Systems

In this paper, the authors present three-dimensional television (3DTV) broadcasting and distribution systems that are employed to deliver a pair of stereoscopic images to mobile users, as well as users at home. First, mobile 3DTV systems and services based on DMB and DVB-H are respectively introduced. Second, fixed and high-definition 3DTV systems and services based on terrestrial digital broadcasting are described along with an introduction of experimental 3DTV services in Korea. To be specific, the authors summarize 3DTV systems from the viewpoints of target services, system and user requirements, system configurations, broadcasting trials, related standards, and technical challenges.

Development of High-definition 3DTV Experimental System based on Dual Stream Method

This paper introduces an development of high-definition(HD) 3DTV experimental broadcasting system and its experimental service that has been launched via three broadcasting network including terrestrial, cable and satellite in the late of 2010. This 3DTV experimental broadcasting service employs an innovative 3DTV broadcasting mechanism, called as dual stream method in which left and right images are encoded by using each video encoder and multiplexed using MPEG-2 system technology for guaranteeing backward-compatibility with legacy DTV. This paper specifically describes the developed experimental broadcasting system, concentrating on 3DTV re-multiplexer and 3DTV receiver. Finally, implementation and terrestrial 3DTV experimental broadcasting service results will be introduced from the point of objective and subjective evaluation.

3D DMB Player and its Realistic 3D Services over T-DMB

In this work, we demonstrate a 3D DMB player which provides users with realistic 3D services over terrestrial-digital multimedia broadcasting (T-DMB). Since the bit-budget for the transmission of additional data stream is strictly limited in the current state of T-DMB, the 3D services are based on depth-image-based rendering (DIBR) that the depth information as the additional data can be compressed efficiently. This demonstration presents a depth preprocessing procedure for reducing holes (disocclusion area) in transmitters and a fast rendering procedure using look-up-table (LUT) in receivers. By means of the 3D services, viewers can consumes realistic and exciting 3D contents in mobile 3D DMB players.

Parallel-axis stereoscopic camera with vergence control and multiplexing functions

Among the 3D stereoscopic cameras to acquire the stereo views, the parallel-axis stereo camera is considered as the simplest one of binocular stereo cameras. However, it is not able to control vergence since its left and right imaging sensors are fixed. In order to overcome such limitations of the stereoscopic cameras, we propose a parallel-axis stereoscopic camera that has functions for the vergence control and video multiplexing simultaneously, which can be implemented by simple and real-time processing without image deterioration. In this paper, we simulate the effects of the vergence control according to the proposed methods, which is accomplished by the over-sampling at ADC and extracted disparity with help of multiplexing function. It is confirm that the processed stereoscopic images by the proposed PASC are very comfortable for viewing on the 3D display within a limited disparity range.

ADT-Based UHDTV Transmission for the Existing ATSC Terrestrial DTV Broadcasting

In this brief, we propose an augmented data transmission (ADT)-based ultrahigh definition (UHD) television transmission system for the existing advanced television systems committee terrestrial digital television (DTV) broadcasting. The proposed system can support a rate of 12 Mb/s using a moving pictures expert group-2 (MPEG-2)-based DTV signal and a rate of 12.5 Mb/s using High Efficiency Video Coding (HEVC)-based DTV and ADT signals. By combining properly an MPEG-2-based DTV signal, an HEVC-based DTV signal and an HEVC-based ADT signal, 4K (3840 × 2160 ) UHD video can be served while providing backward-compatible high-definition video service.

Backward compatible UHDTV transmission based on ADT system for the ATSC terrestrial DTV broadcasting

This paper proposes a backward compatible UHDTV transmission based on augmented data transmission (ADT) system for the ATSC terrestrial DTV broadcasting. The proposed system provides MPEG-2 DTV signal with a rate of 19.3 Mbps and HEVC-base ADT signal with a rate of about 7 Mbps. If we combine MPEG-2 DTV signal and HEVC-base ADT signal properly, we can provide 4K UHD video service as well as backward compatible HD video service simultaneously.

High-definition 3DTV trial service over terrestrial broadcasting network

This paper presents a three-dimensional television (3DTV) trial broadcasting service that has been recently launched in Korea. The 3DTV trial broadcasting service employs a delivery mechanism of 3D content, called as dual stream method that delivers left and right images over each encoded stream based on MPEG-2 system technology, guaranteeing backward-compatibility. Specifically, this dual stream method is regarded as a proper solution for providing higher image quality both 2D and 3D video. This paper also presents a service mechanism along with signaling method, which enables 2D and 3D service to broadcast in a time-scheduled manner. Finally, we summarize the results of high-definition (HD) 3D trial broadcasting service.