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In this paper, we describe geometric aspects of twoand threeview geometry for spherical cameras. The geometric duality on a sphere leads us to re-consider geometric constraints for the three-dimensional reconstruction of points and lines. Using the geometric duality on a sphere, we derive geometric constraints, that is, epipolar circle constraint, for the… (More)

- Allan Kardec D. Barros, Naoya Ohnishi
- IEEE transactions on bio-medical engineering
- 1997

The mean-squared error (MSE) behavior for Fourier linear combiner (FLC)-based filters is analyzed, using the independence assumption. The advantage of this analysis is its simplicity compared with previous results. The MSE transient behavior for this kind of filters is also presented for the first time. Moreover, a time-varying sequence for the least mean… (More)

- Naoya Ohnishi, Atsushi Imiya
- Neurocomputing
- 2008

- Yusuke Kameda, Atsushi Imiya, Naoya Ohnishi
- IWCIA
- 2008

Scaling of Plane Figures That Assures Faithful Digitization p. 87 Computing Admissible Rotation Angles from Rotated Digital Images p. 99 On the Number of hv-Convex Discrete Sets p. 112 Finding the Orthogonal Hull of a Digital Object: A Combinatorial Approach p. 124 A Discrete Approach for Supervised Pattern Recognition p. 136 Image Representation,… (More)

- Naoya Ohnishi, Atsushi Imiya
- Pattern Recognition Letters
- 2006

- Naoya Ohnishi, Atsushi Imiya
- Connect. Sci.
- 2005

In this paper, we develop a free space detection algorithm for the visual navigation of the autonomous robot mounting a catadioptiric omnidirectional imaging system. The algorithm detects the dominant plane as the free space from a sequence of omnidirectional images captured by a camera mounted on the autonomous robot. The dominant plane, which can be… (More)

- Naoya Ohnishi, Atsushi Imiya
- Image Vision Comput.
- 2013

In this paper we present a new blind separation of sources (BSS) algorithm based on second order statistics (SOS) and geometrical approaches. The new algorithm can separate multisources from their instantaneous mixtures obtained by multisensors. In the case of p sources and p sensors, the algorithm can be decomposed into p steps: First, one should transform… (More)

- Naoya Ohnishi, Atsushi Imiya
- MIRAGE
- 2007