Development of 3D video and 3D data services for T-DMB

Abstract

In this paper, we present motivation, system concept, and implementation details of stereoscopic 3D visual services on T-DMB. We have developed two types of 3D visual service : one is '3D video service', which provides 3D depth feeling for a video program by sending left and right view video streams, and the other is '3D data service', which provides presentation of 3D objects overlaid on top of 2D video program. We have developed several highly efficient and sophisticated transmission schemes for the delivery of 3D visual data in order to meet the system requirements such as(1) minimization of bitrate overhead to comply with the strict constraint of T-DMB channel bandwidth; (2) backward and forward compatibility with existing T-DMB; (3) maximize the eye-catching effect of 3D visual representation while reducing eye fatigue. We found that, in contrast to conventional way of providing a stereo version of a program as a whole, the proposed scheme can lead to variety of efficient and effective 3D visual services which can be adapted to many business models.

Development of depth-image-based three-dimensional mobile broadcasting system in terrestrial digital media broadcasting

“…2. 4 In this 3-D T-DMB data service, 3-D object clips with file formats of JPG, PNG, and multiple network graphics ͑MNG͒ are delivered through the auxiliary ͑AUX͒ data path and played on top of 2-D ordinary video. As 3-D T-DMB data service is a kind of program-associated data service, the 3-D objects are related to the 2-D video program, highlighting the eye-catching portions on plain 2-D background video.…”

“…4 Based on MPEG-4 BIFS technology, T-DMB can provide static or dynamic images, graphics, and text data associated with a specific video program, using a flexible scene description tool that allows synchronous representation of audio-visual objects in a scene. As a second approach of 3-D mobile broadcasting service, 3-D T-DMB data service has been proposed by using MPEG-4 BIFS, as shown in Fig.…”

“…1. 4 In this 3-D mobile broadcasting service, a simulcast coding method was adopted to encode two kinds of video ͑reference video and 3-D additional video͒ with a pair of MPEG-4 advanced video coding ͑AVC͒ encoder, guaranteeing backward compatibility and simplifying the whole system. All other functional blocks such as MPEG-4 SL packetizing, MPEG-2 PES packetizing, and MPEG-2 TS multiplexing are applied in the same manner as the existing T-DMB.…”

“…With the help of the development of high-quality autostereoscopic technologies, we have recently introduced a 3-D TV service over T-DMB, what we call a 3-D T-DMB service. 4 However, launching a new broadcasting service generally requires the service provider and manufacturer to consider a variety of viewpoints that are closely related to economical efficiency. In other words, it is very important to minimize a bit budget necessary for the 3-D T-DMB service while maintaining existing services.…”

“…However, the asymmetric coding method is likely to induce some inconvenience for 3-D viewing in cases of severely reduced additional bit rate. As an alternative service method, 3-D T-DMB data service, which uses the MPEG-4 binary format for scene ͑BIFS͒ technology adopted in T-DMB, 4 has been introduced to give a 3-D effect in a different manner. We give a little explanation on this service in the next section.…”