Aiming at the problem of reverse-design of mechanism, a method based on the matching of trajectory code-chains is presented. The motion trajectory of mechanism is described with code-chain, which is normalized to simp...Aiming at the problem of reverse-design of mechanism, a method based on the matching of trajectory code-chains is presented. The motion trajectory of mechanism is described with code-chain, which is normalized to simplify the operation of geometric transformation. The geometric transforma-tion formulas of scale, mirror and rotation for trajectory code-chain are defined, and the reverse de-sign for mechanism trajectory is realized through the analysis and solution of similarity matching between the desired trajectory and the predefined trajectory. The algorithm program and prototype system of reverse design for mechanism trajectory are developed. Application samples show that the method can break the restriction of trajectory patterns in matching, meet the demand of partial match-ing, and overcome the influence of geometric transformation of trajectory on the reverse design for mechanism.展开更多
A new method for solving the tiling problem of surface reconstruction is proposed. The proposed method uses a snake algorithm to segment the original images, the contours are then transformed into strings by Freeman＇...A new method for solving the tiling problem of surface reconstruction is proposed. The proposed method uses a snake algorithm to segment the original images, the contours are then transformed into strings by Freeman＇ s code. Symbolic string matching technique is applied to establish a correspondence between the two consecutive contours. The surface is composed of the pieces reconstructed from the correspondence points. Experimental results show that the proposed method exhibits a good behavior for the quality of surface reconstruction and its time complexity is proportional to mn where m and n are the numbers of vertices of the two consecutive slices, respectively.展开更多
基音轨迹是语音评估中重要的参数,它的高低变化反映了语音的音高起伏和语调韵律特点。为了准确地评估一段语音,利用变长夹角链码(Alterable Included Angle Chain,AIAC)来准确提取说话者的基音轨迹,对比模仿者与标准发音的基音轨迹的相...基音轨迹是语音评估中重要的参数,它的高低变化反映了语音的音高起伏和语调韵律特点。为了准确地评估一段语音,利用变长夹角链码(Alterable Included Angle Chain,AIAC)来准确提取说话者的基音轨迹,对比模仿者与标准发音的基音轨迹的相似度,研究基音轨迹相似度的匹配算法及曲线拟合算法,从而完成基音特征相似性的评估。结果表明:该方法不仅能够准确、快捷提取说话者的基音轨迹,而且计算过程简单,操作简便并能够取得良好的评估效果。展开更多
In this paper a series of digital image processing methods were adopted for getting separated coarse aggregates from asphalt mixture specimen using high-resolution X-ray Computed Tomography (CT) images.The existing th...In this paper a series of digital image processing methods were adopted for getting separated coarse aggregates from asphalt mixture specimen using high-resolution X-ray Computed Tomography (CT) images.The existing three dimensional (3D) particles matching methods based on two dimensional (2D) continuous cross-sections were analyzed and a new 'overlap area method' was presented.After the 3D particles were extracted one by one successfully,the basic parameters of each aggregate:perimeter,area,surface area,and volume were calculated by chain code method.Finally,the 3D mass center coordinates and the sphericity index were introduced.展开更多
基金This project is supported by National Hi-tech Research and Development Program of China (863 Program, No. 2006AA04Z114)Research Fund for the Doctoral Program of Higher Education, China (No. 20040335060)Provincial Scientific Personnel Educational Foundation of Zhejiang, China (No. R603240).
文摘Aiming at the problem of reverse-design of mechanism, a method based on the matching of trajectory code-chains is presented. The motion trajectory of mechanism is described with code-chain, which is normalized to simplify the operation of geometric transformation. The geometric transforma-tion formulas of scale, mirror and rotation for trajectory code-chain are defined, and the reverse de-sign for mechanism trajectory is realized through the analysis and solution of similarity matching between the desired trajectory and the predefined trajectory. The algorithm program and prototype system of reverse design for mechanism trajectory are developed. Application samples show that the method can break the restriction of trajectory patterns in matching, meet the demand of partial match-ing, and overcome the influence of geometric transformation of trajectory on the reverse design for mechanism.
文摘A new method for solving the tiling problem of surface reconstruction is proposed. The proposed method uses a snake algorithm to segment the original images, the contours are then transformed into strings by Freeman＇ s code. Symbolic string matching technique is applied to establish a correspondence between the two consecutive contours. The surface is composed of the pieces reconstructed from the correspondence points. Experimental results show that the proposed method exhibits a good behavior for the quality of surface reconstruction and its time complexity is proportional to mn where m and n are the numbers of vertices of the two consecutive slices, respectively.
文摘基音轨迹是语音评估中重要的参数,它的高低变化反映了语音的音高起伏和语调韵律特点。为了准确地评估一段语音,利用变长夹角链码(Alterable Included Angle Chain,AIAC)来准确提取说话者的基音轨迹,对比模仿者与标准发音的基音轨迹的相似度,研究基音轨迹相似度的匹配算法及曲线拟合算法,从而完成基音特征相似性的评估。结果表明:该方法不仅能够准确、快捷提取说话者的基音轨迹,而且计算过程简单,操作简便并能够取得良好的评估效果。
基金Sponsored by the Key Projects of National Natural Science Foundation of China (Grant No.51038004)the Western China Communications Construction and Technology Project (Grant No.2009318000078)
文摘In this paper a series of digital image processing methods were adopted for getting separated coarse aggregates from asphalt mixture specimen using high-resolution X-ray Computed Tomography (CT) images.The existing three dimensional (3D) particles matching methods based on two dimensional (2D) continuous cross-sections were analyzed and a new 'overlap area method' was presented.After the 3D particles were extracted one by one successfully,the basic parameters of each aggregate:perimeter,area,surface area,and volume were calculated by chain code method.Finally,the 3D mass center coordinates and the sphericity index were introduced.
