The spatial relationships of contours play important roles in many areas such as extracting topographic features from contour maps, automatically identifying elevations of scanned contours, et al.. In those areas, one key issue is making computers identify the relationships of contours. The spatial relationships of contours are usually represented by contour tree. Contour tree is essentially a ...

We propose a novel active contour model by incorporating particle based electrostatic interactions into the geometric active contour framework. The proposed active contour, embedded in level sets, propagates under the joint influence of a boundary attraction force and a boundary competition force. Unlike other contour models, the proposed vector field dynamically adapts by updating itself when ...

In this paper, a novel affine invariant shape descriptor for planar contours is proposed. It is based on a multi-resolution representation of the contour. For each contour resolution, a shape signature is defined from the contour points and the initial contour centroid and points. Finally, Fourier descriptors are computed for each signature. The proposed descriptor is invariant to affine transf...

This paper proposes a combination of contour deformation modelling in Sobolev spaces and the Condensation filter to track an object over a sequence of images. As Sobolev spaces are smoothness spaces this allows to control the smoothness of the contour deformation extending previous wavelet representations. We also introduce a probabilistic model for the wavelet deformation of the contour that i...

This paper proposes a technique for tracking a superquadricmodelled object over a monocular video sequences. The object is currently modelled with a single superquadric. Object’s position and orientation in the first frame of the sequence are assumed known. A frame in a sequence is first processed to find object’s contour. Contour is determined by extracting edges on the frame in the vicinity o...

Level, rising and falling pitch contours were presented to twenty native speakers of Mandarin Chinese and twenty-one native speakers of English for discrimination in a same-different categorial discrimination task. Overall, Mandarin listeners were significantly more successful than English listeners. However, both groups exhibited a similar pattern of perceptual advantage for rising and falling...

We present a method to recognize a complicated curved object from an image contour. We are developing a system that automatically measures train wheel abrasion from its contour image. Because a train wheel consists of a curved surface, the transformation of the image contour due to position variation affects the measurement accuracy. The 3D shape model of the train wheel is analyzed to compute ...

This paper proposes a new fundamental frequency(F0) contour control method based on vector representation of F0 contour. The main points of the proposed method are as follows; (1) Desired F0 contours are created by selecting or modifying natural F0 contours held in a speech database. (2) F0 contour selection is based on statistical estimation using a vector representation of F0 contour (3) The ...

Abstract Mixed reality applications often require virtual objects that are partly occluded by real objects. However, previous research and commercial products have limitations in terms of performance efficiency. To address these challenges, we propose a novel depth contour occlusion (DCO) algorithm. The proposed method is based on the sensitivity binocular stereoscopic vision device. In this me...

To determine the dynamics of contour integration the temporal properties of the individual contour elements were varied as well as those of the contour they form. A temporal version of a contour integration paradigm (Field, D. J., Hayes, A., & Hess, R. F. (1993) Vision Research, 33, 173–193) was used to assess these two temporal dynamics as a function of the contrast of individual elements and ...