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- Naoya Ohta, Kenichi Kanatani
- ECCV
- 1998

We discuss optimal rotation estimation from two sets of 3-D points in the presence of anisotropic and inhomogeneous noise. We rst present a theoretical accuracy bound and then give a method that attains that bound, which can be viewed as describing the reliability of the solution. We also show that an e cient computational scheme can be obtained by using… (More)

- Naoya Ohta
- ICCV
- 2001

Background subtraction is a commonly used process in surveillance systems. One difficult problem when using the process is maintaining a correct background image against changing illumination conditions. Most methods for maintaining the background image are based on intuitive definitions about the illumination change and are implemented as somewhat ad hoc… (More)

- Kenichi Kanatani, Naoya Ohta
- Int. J. Image Graphics
- 2004

We present a new method for automatically detecting circular objects in images: we detect an osculating circle to an elliptic arc using a Hough transform, iteratively deforming it into an ellipse, removing outlier pixels, and searching for a separate edge. The voting space is restricted to one and two dimensions for efficiency, and special weighting schemes… (More)

- Jun-ichi Funada, Naoya Ohta, +6 authors Yoshifumi Yamada
- ICPR
- 1998

A new method of extracting palmprint features is presented in this report. Since palmprint images have many creases which are organized like ridges, ordinary ngerprint feature extraction algorithms are unable to extract ridges. Consequently, the goal of this research is to construct a new feature extraction method which can extract ridges under these… (More)

- Shigeo Takahashi, Naoya Ohta, Hiroko Nakamura, Yuriko Takeshima, Issei Fujishiro
- Comput. Graph. Forum
- 2002

It is still challenging to generate hand-drawn pictures because they differ from ordinary photographs in that they are often drawn as seen from multiple viewpoints. This paper presents a new approach for modeling such surperspective projection based on shape deformation techniques. Specifically, surperspective landscape images for guide-maps are generated… (More)

- Naoya Ohta, Kenichi Kanatani
- IEICE Transactions
- 1995

This paper presents a new method for solving the structure-from-motion problem for optical ow. The fact that the structure-from-motion problem can be simpli ed by using the linearization technique is well known. However, it has been pointed out that the linearization technique reduces the accuracy of the computation. In this paper, we overcome this… (More)

- Kenichi Kanatani, Yoshiyuki Shimizu, Naoya Ohta, Michael J. Brooks, Wojciech Chojnacki, Anton van den Hengel
- J. Electronic Imaging
- 2000

The optical flow observed by a moving camera satisfies, in the absence of noise, a special equation analogous to the epipolar constraint arising in stereo vision. Computing the ‘‘flow fundamental matrix’’ of this equation is an essential prerequisite to undertaking three-dimensional analysis of the flow. This article presents an optimal formulation of the… (More)

- Naoya Ohta
- 1996

The uncertainty involved in the gradient constraint for optical ow detection is often modeled as constant Gaussian noise added to the time-derivative of the image intensity. In this paper, we examine this modeling closely and investigate the error behavior by doing simulation. Our result indicates that the error depends on both the spatial derivatives and… (More)

- Kenichi Kanatani, Naoya Ohta
- J. Electronic Imaging
- 2003

We present two linear algorithms for 3-D reconstruction: one is for finite motion; the other is for optical flow. We compare their performance by simulation and real-image experiments, using the same data. The two algorithms are both theoretically optimal, extracting maximum information from the input. We observe that the 3-D reconstruction by the finite… (More)

- Noriaki Yoshiura, Yusaku Fujii, Naoya Ohta
- 2013 13th International Symposium on…
- 2013

Currently, in the whole world, enormous electric energy is consumed by the street lights, which are automatically turn on when it becomes dark and automatically turn off when it becomes bright. This is the huge waste of energy in the whole world and should be changed. This paper discusses a smart street light system, whose concept is proposed by Fujii et… (More)