Yasuzo Suto

An algorithm for removing sections of bone from x-ray ct models

With the current rapid advances in computer graphics and CAD/CAM technology, considerable research is being done on the display of three-dimensional images, and this includes the medical field. One typical medical application is simulated surgery, of which bone cutting is an essential part. Facilities for removing bone sections two-and also three-dimensionally are required. This paper describes the algorithms developed for three-dimensional bone section removal and designed for high speed and ease of operation. An actual plastic surgery case to which our algorithms were applied is presented. The three-dimensional images were constructed from multislice CT data, and the simulations were performed using a high-speed graphics processor.

A study on picture feature extraction and picture recognition

In general, the feature extraction process in picture recognition requires troublesome global picture computations. The purpose of this paper is to describe a practical and general purpose feature extraction algorithm for binary pictures by utilizing perceptions. This algorithm proves that effective feature values can be extracted on the basis of fully local picture computation. The localness of a picture computation is evaluated by the coacept called the “order” of a perceptron. Further, based on this feature extraction algorithm, an efficient picture recognition system is realized. The effectiveness and practicability of this system are clarified by computer simulation experiments.

Visualization of Historical Cultural Properties by Web3D

With the spread of the Internet, the technology of Web3D that can display three-dimensional computer graphics on Web has been developed. Using VRML (Virtual Reality Modeling Language) to be a kind of Web3D, the historical cultural properties of art museum, the ruins of a castle etc. relate to Numazu city in Japan to be the seat of our university were made, and the inside of three-dimensional space could be inspected freely through the Internet. The contents that have been made are Gen Yamaguchi virtual art museum, Numazu Imperial Villa, Bokusui Wakayama Memorial Hall, Koukoku-ji castle and Numazu Shoji art museum. Moreover, the system to retrieve easily these contents was developed.

Three-Dimensional Display of X-Ray CT Image Extraction and Display of Cerebral Ventricle

Multi-slice images obtained by X-ray CT essentially have a three-dimensional data structure. They are useful for diagnosis and treatment through three-dimensional display. Surface display of organs is an effective three-dimensional display. However, although completely automatic processing of contour extraction is desirable it is also very difficult. For surface display, it is very important to extract contours of organs. Accordingly, using an interactive method, we have developed an algorithm for accurate three-dimensional display after extracting images of the cerebral ventricle. Satisfactory results have been obtained.

Three-Dimensional Display of X-Ray CT Image

Multi-slice images obtained by X-ray CT essentially have a three-dimensional data structure. They are useful for diagnosis and treatment through three-dimensional display. Surface display of organs is an effective three-dimensional display. However, although completely automatic processing of contour extraction is desirable it is also very difficult. For surface display, it is very important to extract contours of organs. Accordingly, using an interactive method, we have developed an algorithm for accurate three-dimensional display after extracting images of the cerebral ventricle. Satisfactory results have been obtained.

Design and evaluation of a receptor

Abstract A pattern recognition system is divided into two parts, a receptor and a categorizer. In this research, a creative receptor is designed, and then an effective pattern recognition system based on the receptor is constituted. The receptor is composed of a set of unique matrix operators which allow it to perform efficient feature measurement extraction. The feature measurements are ranked in effective order, based on another function of the receptor. For the categorizer, a well-known optimization theory is applied. To evaluate the performance of this system, some evaluation functions are defined. Therefore, the receptor mechanism is optimized by the functions. This system is experimentally evaluated by computer simulations.