Masato Ogata

Learn More
Hardware-accelerated image composition for sort-last parallel rendering has received increasing attention as an effective solution to increased performance demands brought about by the recent advances in commodity graphics accelerators. So far, several different hardware solutions for alpha and depth compositing have been proposed and a few of them have(More)
A number of problems are well suited for volumetric representation for both simulation and storage, however, the large amount of data that needs to be processed and rendered with these volumes makes interactive manipulation extremely challenging. We present a scalable PC cluster system (VG cluster) designed specifically to enable simultaneous volumetric(More)
To seek a low-cost, extensible solution for the large-scale data visualization problem, a visual computing system is designed as a result of a collaboration between industry and government research laboratories in Japan, also with participation by researchers in U.S. This scalable system is a commodity PC cluster equipped with the VolumePro 500 volume(More)
OBJECTIVES To describe the development of a patient-specific simulator for laparoscopic renal surgery. METHODS Image data of each patient scheduled to undergo laparoscopic renal surgery are captured by the simulator, enabling each patient's organs to be reproduced. The surgeon can carry out a preoperative "rehearsal" of the operation by using a simulator(More)
An experimental study of software image compositing that we have carried out on a 512-node PC cluster shows the necessity of hardware compositing support to make possible real-time volume visualization scalable with large PC clusters. This paper describes the design and performance evaluation of such a hardware image compositing device. A PC cluster using(More)
Objectives. Here we developed a unique training system, a patient specific virtual reality simulator, for laparoscopic renal surgery. To develop the simulator, it was important to first identify the physical properties of the organ. Methods. We recorded the force measured during laparoscopic surgery performed on pigs by using forceps with pressure sensors.(More)
At the Advanced Medical Research Center at Yokohama City University School of Medicine, we have been developing a practical surgical simulator for renal surgery. Unlike already commercialized laparoscopic surgical simulators, our surgical simulator is capable of using patient-specific models for preoperative training and improvement of laparoscopic surgical(More)
This paper describes an object-order real-time volume rendering architecture using an adaptive resampling scheme to perform resampling operations in a unified parallel-pipeline manner for both parallel and perspective projections. Unlike parallel projections, perspective projections require a variable resampling structure due to diverging perspective rays.(More)