Associate Professor Kouichi Konno

Associate Professor　Kouichi Konno
　

■ Major field
　CAGD, CAD/CAM, Shape Modeling
　VR, CG

■ Profile

1985 Dept. of Information Science, Tsukuba University (BS)

1985
- 1999 Ricoh Co., Ltd. Software Research Center

1996 Dr. of Engineering, Dept. of Precision Machinery Engineering, University of Tokyo

1999
- 2001 Lattice Technology, Inc.,

2001 Associate Professor at Iwate University

■ Publications

Reparameterization of piecewise rational Bezier curves and its applications, The Visual Computer, Vol. 17, No.6
A G1 Connection around Complicated Curve Meshes Using C1 NURBS Boundary Gregory Patches，CAD，Vol．33，No．4
An Approach of Designing and Controlling Free-Form Surfaces by Using NURBS Boundary Gregory Patches, Computer Aided Geometric Design, Vol.13, No. 9, pp.825-849
G1 and G2 Surface Interpolation over Curve Meshes and Its Shape Control, International Journal of SHAPE MODELING, Vol. 2, No 1, pp. 1-20
Approximate conversion of a rational boundary Gregory patch to a nonuniform B-spline surface, The Visual Computer, Springer-Verlag, Heidelberg, Vol.11, No.7.

■ Research

Methodologies to generate a 3D shape on a computer have been researched in our laboratory. A 3D shape modeling that is one of the basic technologies for CAD/CG plays an important role for CG rendering, computer simulation, and digital archives. One problem in 3D shape modeling is how to describe surfaces of the shape. A lot of kinds of surface equations have been studied, such as Bezier surface or B-spline surface. Generally, a surface is represented by a quadric or a cubic equation. However, surface equation depends on applications or modeling methods. Our laboratory has researched general surface representation to model a 3D shape easily. We also have researched geometric operations for 3D shape modeling and applications of 3D models.

3D model generation:
In this theme, the algorithm for generating surfaces from various kind of data and the surface representation of a 3D model have been studied. Currently, the subjects for modeling and shape analysis are as follows:

Terrain modeling
Stone implement
Artificial building
Mechanical parts

Applications for 3D shape modeling:
In this theme, technologies of applications for 3D shape modeling have been studied. Currently, the following topics are researched.

Computer aided technical drawing for stone implement
Data simplification for huge 3D model
Fast drawing method for huge 3D model

Contours (Mt. Iwate)	Terrain model	Stone implement	Surface analysis of stone implement
Replica generation	Registration of point clouds	Fast drawing	N-side filling

■ To KONNO LAB.