Hanchao Jia

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In this paper we propose a novel method of estimating vanishing point by spherical gradient. In contrast with the conventional methods in which vanishing point is estimated from lines, the proposed method does not necessarily extract lines, but employs the spherical gradient cues of edge points. Based on the observation that spherical gradient is aligned(More)
In this paper we propose a novel method of estimating indoor scenes from a single full-view image. On the one hand, the conventional methods cope with limited field of view images, such as perspective images and hemispherical omnidirectional images, which result in visually open boundary condition, called open geometry. On the other hand, a full-view image(More)
This paper proposes a method of detecting Harris corners from spherical retina image, which is assumed to be captured from a spherical retina camera. In a spherical retina camera, the photodetectors are supposed to be arranged on a sphere. Therefore, a spherical retina image is a discrete spherical image, which is obtained by tessellating a sphere into(More)
A divisible geodesic dome's image is often used for the representation of a spherical image in a digital computer. In the spherical image, any points are enclosed by a triangle facet whose vertices correspond to the position of the pixels. In this paper we propose two novel algorithms of interpolating a point on a sphere based on the values of the three(More)
Field cultivation experiments on white sesame (Sesamum indicum L.) seeds implanted with low-energy C ion showed that different dosages of C ion implantation produce different biological effects. Sesame plants in 6 different dosage groups with C ion density respectively at 1 × 1011, 1 × 1012, 1 × 1015, 5 × 1015, 1 × 1016, 5 × 1016 ion/cm2 were superior to(More)
While the conventional image plane is planar, recently bio-inspired cameras are developed in which the photodetectors are positioned on a hemisphere. Image captured by such a spherical retina camera is a discrete spherical image with irregular pixels. In this paper we propose a novel method of computing optical flow from such discrete spherical images. We(More)
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