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Toshiba's Basic Research Supporting Visual and Imaging Technologies Importance of Advanced Visual and Imaging Platform Technologies SHIMODA Kenji Visual and Imaging Technologies Accelerating Quality and Added Value Enhancement WATANABE Toshiaki / FUNAKI Hideyuki / MURAI Shinya Demand for larger screens and multiple functions has been rising in recent years in the field of images and related devices. Under these circumstances, the ability to receive large volumes of image information, transmit such data effectively, and display the images attractively is of key importance. Toshiba has been engaged in the research and development of fundamental technologies, including efficient compression technologies, Internet transmission technologies, advanced three-dimensional (3D) display technologies, and large organic electroluminescence (EL) sheet display technologies, as well as intelligent cameras equipped with an image recognition processor and far-infrared image sensors. We are continuing our efforts to provide total high-quality solutions by combining individual fundamental technologies and adjusting the parameters for optimum performance. Far-Infrared Image Sensor with Improved Temperature Stability and Response Speed ISHII Koichi / HONDA Hiroto / FUNAKI Hideyuki A far-infrared image sensor is a two-dimensional temperature sensor that can visualize temperature distribution by detecting infrared radiation emitted from objects. Far-infrared image sensors make it possible to detect unusual temperature conditions, which is impossible with visible and near-infrared sensors, in the main application fields including automotive night-vision systems for pedestrian detection and the maintenance and surveillance of buildings and facilities. Toshiba has been developing far-infrared image sensors using single-crystal silicon fabricated on a semiconductor mass-production line, and refined the pixels by applying advanced semiconductor processes. However, the temperature stability required for outdoor use of these sensors and the tradeoff between the sensitivity and response speed are significant issues. To overcome these problems, we have newly developed a read-out circuit to improve the temperature stability and a pixel structure to improve the response speed without reduction of the sensitivity. We have confirmed that, as a result of these developments, the sensor output fluctuation according to the variation in chip temperature is reduced to 1/20 compared with that of the conventional sensor and the response speed is improved by 36%. Intelligent Camera Incorporating ViscontiTM2 Image Recognition Processor KOZAKAYA Tatsuo / WATANABE Tomoki / OKADA Ryuzo As the number of network cameras increases year by year, the operation and maintenance costs are growing accompanying the expansion of both the network traffic and the monitoring task load. Demand has therefore been rising for a network camera with an image processing function to improve cost effectiveness and save labor. Toshiba has developed an intelligent camera incorporating the ViscontiTM2 image recognition processor, which is equipped with several hardware accelerators and offers high-speed image recognition processing such as object detection with enhanced performance. As the ViscontiTM2 makes it possible to simultaneously capture video frames and apply advanced image recognition processing to these frames in the intelligent camera, operators can efficiently evaluate the worth of each frame and quickly focus on the important scenes. We have confirmed the effectiveness of the intelligent camera through demonstration experiments on the simultaneous real-time detection of four types of objects including a human face, a human upper body, cars, and a cat. High-Efficiency Motion-Compensated Weighted Prediction Technology toward HEVC Next-Generation Video Coding Standard TANIZAWA Akiyuki / YAMAGUCHI Jun / CHUJOH Takeshi The Joint Collaborative Team on Video Coding (JCT-VC) has been established to develop a next-generation video coding standard, called HEVC (High Efficiency Video Coding), which aims at a substantial improvement in coding efficiency compared with the existing H.264/AVC (Advanced Video Coding) standard. The JCT-VC is planning to finalize the HEVC standardization activity by the beginning of 2013. Toshiba has been promoting the development of video coding technologies to improve coding efficiency even before this activity and has proposed many types of technologies toward HEVC standardization. One of these technologies, a motion-compensated weighted prediction (WP) technology to predict temporal illumination variations in specific video contents with a fade effect, has been adopted as a draft specification for HEVC. HEVC is expected to realize the distribution of high-quality video contents to various audiovisual devices including tablets, TV sets, and PCs. NPEngineTM Equipped with Direct Storage Access Technology for Video Streaming Servers YAMAURA Takahiro / YAMAGUCHI Kensaku / HASHI Yasumichi With the broad dissemination of wideband networks and mobile audiovisual terminals including smartphones and tablets in recent years, the number of video services provided via the network is increasing. However, the performance of conventional video streaming servers is limited by the speed of the central processing unit (CPU) and the bandwidth of the memory. To overcome these problems, Toshiba has developed NPEngineTM equipped with a direct storage access technology that can directly transfer data from the storage to the network, bypassing the CPUs and memories in video streaming servers. This technology makes it possible to reduce the workload of CPUs and the bandwidth utilization of memories. We have applied it to the ExaEdgeTM video streaming server, which can distribute video contents to a large number of users (up to 64,000). Multiple-Face Tracking Technology for Glasses-Free 3D Displays SHIMOYAMA Kenichi / MITA Takeshi / HIRAI Ryusuke Autostereoscopic displays enable viewers to watch three-dimensional (3D) images without wearing dedicated glasses. However, the viewers are forced to watch the display from within a limited area, called the viewing zone, in order to enjoy high-quality 3D images. As a solution to this issue, Toshiba has developed a multiple-face tracking technology that can automatically control the viewing zone according to the viewers' positions detected by a camera installed in the TV set. This technology makes it possible to find the best position of the viewing zone for multiple viewers so as to maximize the 3D-satisfaction ratio. We have conducted simulation experiments for a family of four and confirmed that the average 3D-satisfaction ratio of four viewers is 3.8 in the viewing zones using our newly developed technology, compared with only 1.7 using the conventional method. Depth-Adapted Super-Resolution Technology to Achieve Depth Recovery of Images ONO Toshiyuki / TAGUCHI Yasunori / KANEKO Toshimitsu With the development of TVs equipped with 4K2K (3,840 x 2,160 pixels)-resolution liquid crystal displays (LCDs), including the REGZA 55XS5 LCD TV developed by Toshiba, the market for such 4K2K-resolution TVs has been expanding. 4K2K-resolution TVs are attracting attention due to their better image quality reproduction with a higher degree of realism compared with full high-definition (1,920 x 1,080 pixels) TVs. Toshiba has been devoting continuous efforts to the enhancement of image quality appropriate to the resolution of displays through the development of super-resolution technologies. We have now developed a depth-adapted super-resolution technology for 4K2K-resolution TVs, which can recover the depth feel of images by controlling the super-resolution effect based on the depth information of images. With this new technology, we have succeeded in reproducing more realistic images than ever. OLED Sheet Display Driven by Oxide Semiconductor Thin-Film Transistors SAITO Nobuyoshi / SAKANO Tatsunori / YAMAGUCHI Hajime In order to realize a sheet display with ultrathinness, light weight, and flexibility like that of paper, the glass substrate of display panels must be replaced by a material that is not easily broken such as a plastic substrate. However, it is difficult to achieve thin-film transistors (TFTs) with high mobility and stability on a plastic substrate because plastic films are generally less durable under high temperature than glass substrates. To solve this issue, Toshiba has developed an indium gallium zinc oxide (InGaZnO) TFT with high mobility on a plastic substrate, whose stability is almost equal to that of an InGaZnO TFT fabricated on a glass substrate. This was realized by improving the quality of low-temperature-formed films. Using this technology, we have succeeded in fabricating an 11.7-inch organic light-emitting diode (OLED) sheet display. |