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Depth Enhancement Using Domain Transform-Based Multipoint Filter
Li Li,Caiming Zhang (사)한국CDE학회 2013 한국CAD/CAM학회 국제학술발표 논문집 Vol.2010 No.8
The paper presents a novel depth enhancement method to improve the spatial resolution and quality of initial depth estimates. Our solution is based on a domain transform-based multipoint filter framework. Compared to the pointwise filter, the estimates are calculated for all observation pixels in the multipoint filter model. We use the piecewise constant model to calculate the estimates in an adaptive support region which is computed based on the domain transformation of color image. Then a number of such estimates are aggregated together by weighted averaging to final depth estimate. By quantitative and qualitative experiments on publicly available test sequences, we demonstrate the capabilities of our domain transform-based multipoint filter on the depth enhancement task.
Yunfeng Zhang,Fangxun Bao,Caiming Zhang,Qiang Guo,Qi Duan (사)한국CDE학회 2013 한국CAD/CAM학회 국제학술발표 논문집 Vol.2010 No.8
Spline surface is a very important part in Computer Aided Geometric Design. A bivariate rational interpolation spline surface based on function values has been constructed in[9]. It can achieve good approximation effect with parameters, but it would also make the surface control difficult. This paper deals with the constraint methods of partial derivative and directional derivative. the sufficient conditions to modified the partial derivative and directional derivative are derived. The partial derivative and directional derivative can be changed by selecting suitable parameters under the condition that the interpolating data are not changed. Numerical example are given to show how the parameters can be chosen and the shape of surface changed.
Geometric Hermite Curves Based on Curvature Variation Minimization
Chi, Jing,Zhang, Caiming,Wu, Xiaoming Society for Computational Design and Engineering 2006 International Journal of CAD/CAM Vol.6 No.1
Based on the smoothness criterion of minimum curvature variation of the curve, tangent angle constraints guaranteeing an optimized geometric Hermite (OGH) curve both mathematically and geometrically smooth is given, and new methods for constructing composite optimized geometric Hermite (COH) curves are presented in this paper. The comparison of the new methods with Yong and Cheng's methods based on strain energy minimization is included.
[ $C^1$ ] Continuous Piecewise Rational Re-parameterization
Liang, Xiuxia,Zhang, Caiming,Zhong, Li,Liu, Yi Society for Computational Design and Engineering 2006 International Journal of CAD/CAM Vol.6 No.1
A new method to obtain explicit re-parameterization that preserves the curve degree and parametric domain is presented in this paper. The re-parameterization brings a curve very close to the arc length parameterization under $L_2$ norm but with less segmentation. The re-parameterization functions we used are $C^1$ continuous piecewise rational linear functions, which provide more flexibility and can be easily identified by solving a quadratic equation. Based on the outstanding performance of Mobius transformation on modifying pieces with monotonic parametric speed, we first create a partition of the original curve, in which the parametric speed of each segment is of monotonic variation. The values of new parameters corresponding to the subdivision points are specified a priori as the ratio of its cumulative arc length and its total arc length. $C^1$ continuity conditions are imposed to each segment, thus, with respect to the new parameters, the objective function is linear and admits a closed-form optimization. Illustrative examples are also given to assess the performance of our new method.
Youbing Peng,Hai Cheng,Caiming Shen,Ying Xu,Naifang Bei 한국기상학회 2018 Asia-Pacific Journal of Atmospheric Sciences Vol.54 No.3
Widely distributed proxy records show that there were out-of-phase behaviors of moisture change between arid central Asia (ACA) and monsoonal northern China during the Little Ice Age (LIA) and Medieval Climate Anomaly (MCA). We examined spatial pattern differences between the MCA and LIA to identify contrasting patterns of summer precipitation variability, and to diagnose explanatory mechanisms through the analysis of a 1000-year global climate model simulation driven by natural and anthropogenic forcing. The results show that the model was able to roughly produce the general features of MCA-LIA hydroclimatic spatial differences between monsoonal northern China and ACA, with a relatively wet MCA found in monsoonal northern China and a relatively dry MCA found in ACA. A further analysis of associated circulations shows that increased summer precipitation in monsoonal northern China was caused by the strengthening of summer monsoon, while the decline in summer precipitation in ACAwas caused by an anomalous northward displacement of the subtropical westerly jet stream. Our analyses suggest that both effective solar forcing and El-Niño Southern Oscillation (ENSO) may produce these contrasting patterns of precipitation between monsoonal northern China and ACA. Due to a change in the probability of ENSO phases at the centennial time scale found in our experiments may be attributed to solar irradiances, higher effective solar irradiances during the MCA relative to those of the LIA may have been the ultimate forcing mechanism for the simulated precipitation differences between the MCA and LIA.