Takuyo Kogure

MPEG-4 IPMP extension for interoperable protection of multimedia content

To ensure secure content delivery, the Motion Picture Experts Group (MPEG) has dedicated significant effort to the digital rights management (DRM) issues. MPEG is now moving from defining only hooks to proprietary systems (e.g., in MPEG-2, MPEG-4 Version 1) to specifying a more encompassing standard in intellectual property management and protection (IPMP). MPEG feels that this is necessary in order to achieve MPEGs most important goal: interoperability. The design of the IPMP Extension framework also considers the complexity of the MPEG-4 standard and the diversity of its applications. This architecture leaves the details of the design of IPMP tools in the hands of applications developers, while ensuring the maximum flexibility and security. This paper first briefly describes the background of the development of the MPEG-4 IPMP Extension. It then presents an overview of the MPEG-4 IPMP Extension, including its architecture, the flexible protection signaling, and the secure messaging framework for the communication between the terminal and the tools. Two sample usage scenarios are also provided to illustrate how an MPEG-4 IPMP Extension compliant system works.

Space-Sampling Method for 3D Cinemas

A new approach to 3D Cinematography based on Space-Sampling method is presented. This method treats a projected 3D image space instead of a linear 3D space. It well matches with the visual perception and nicely reduces the data size needed for 3D scenes. It also matches with the 3D camera-shooting and the 3D displays requiring no eyewear. Space-Sampling method captures 3D natural scenes through a lens with transparent image-sensor layers. Hence, the 3D image space is directly sampled at a video-rate with single camera. Captured images are rendered on a transparent multi-layer display. Thus, a truly volumetric image is observed without eyeglasses. Combination rendering of these natural scenes with 3D computer-graphic (CG) objects creates a realistic Synthesized & Natural Hybrid scene at a reasonable cost. Depth from Focus technology and Depth-Fuse anti-aliasing technology were used to eliminate the blurred objects and to enhance the depth resolution, respectively.

REALITY OF HIGH-QUALITY THREE-DIMENSIONAL IMAGES

This paper addresses the problem of overall quality measure for high-quality three-dimensional (3D) images employing a new criteria: reality, which is defined as a function of picture parameters relating to immersion, picture quality and 3D sensation. Based on this criterion, the subjective quality and the objective quality of 3D images displayed by different systems are measured. The regression analysis showed consistency between them by introducing a penalty factor for artificial contents. This measure will be useful for the evaluation of emerging high-quality 3D images

Disparity-compensated picture prediction for multi-view video coding

Multi-view video coding (MVC) is currently being standardized by International Standardization Organization (ISO) and International Telecommunication Union (ITU). Although translation-based motion compensation can be applied to the picture prediction between different cameras, a better prediction exists if the camera parameters are known. This paper analyses the rules between pictures taken at the parallel or arc camera arrangements where the object is facing to an arbitrary direction. Based on the derived rules, block-width, block-slant and block-height compensations are proposed for the accurate picture prediction. A fast disparity vector detection algorithm and an efficient disparity vector compression algorithm are also discussed.