We have been studying automatic contents generation with the aim of eventually fusing a TV-type service with a Web-type service. We have developed the TV4U system, which automatically produces informative variety programs for individual viewers at the viewer's location. The system automatically collects information and materials from sources such as broadcasts, the Internet, and PCs. Then, it composes a TV program tailored to the individual viewer's tastes. The contents are uniquely produced for each viewer. The system also has the capabilitv that a viewer can interrupt the TV program at anytime and directly talk with the CG characters in the program.
We are studying an image-based virtual studio for television program production. The image-based virtual studio consists of background image and live image of actor. We have developed a method of modification of lighting condition on background. Moreover, we applied this method to image-based virtual studios. In this method, we have defined the light model as main light source and environmental light source. Then one can change shading of background image to manipulate onlv diffuse reflection.
Studio parts and highlight programs of "FIFA2002 the World Cup" (Japan and South Korea co-sponsoring) were broadcast using a newly developed virtual studio system. We constructed the system which combined real-time 3DCG software "vizrt" (made by vizrt company) and high-definition 3DCG hardware "AV-VS3000" (made by Matsushita company) for the first time. The system mainly consists of a controller and 3DCG sets for a pedestal camera and a crane camera. We converted the camera data of AV-VS3000 format into the vizrt format and controlled vizrt through network. We report on this system and broadcast scenes in detail.
A lens adapter with image-stabilization function for ENG TV lens has been developed. Plano-concave lens and plano-convex lens that comprise variable angle prism are moved around virtual axes respectively passing through their center of curvature and one point of their edge. In accordance with vibration of camera, the apex angle of prism is varied so that the shake of image is suppressed. By this newly developed driving method, variable angle prism can be driven smoothly with higher response and smaller mechanism. The sample is for 15x ratio zoom lens and mass is 535 grams that is most suitable for FNG camera application.
Optical disk systems will replace VCR systems in broadcasting stations in the future because of their advantageous random access and high endurance features. A 100 Mbps read/write experiment using a laser beam for broadcasts has already been conducted. It was proved by simulation that PR (1, 1, 1) ML with RLL (1, 7) is sutable for high speed optical disk system. PR (1, 1, 1) ML channel by using FPGA is demonstrated high speed diriving. A demultiplex circuit and an add-compare-select recursion of this read channel is driving at the channel clock of 150 MHz (correspinding to the data transfer rate of lOOMbps). It has many merits that a general FPGA is used. High speed optical disk system wiil be achieved by using this readchannel.
Phase-change optical disk which can be recorded and erased with high linear speed is studied to realize high data transfer rate. The crystallization speed of phase-change material must be raised for high-data-transfer rate. However, the re-crystallization of the phase-change material is a problem if crystallization speed is too high. Therefore, it is necessary for accurate mark to estimate characteristics of recording medium and to decide recording strategy. In this report, the problem which is clarified from the experiment is confirmed by the mark profile simulation using three-dimensional thermal calculation and Johnson-Mehl-Avrami equation, and the solution using recording strategy is reported.