The precondition of realizing feedback controlling DC DC converter to avoid chaotic state is to judge the behavior of the converter and take corresponding measures. In this paper, the output signals under different ci...The precondition of realizing feedback controlling DC DC converter to avoid chaotic state is to judge the behavior of the converter and take corresponding measures. In this paper, the output signals under different circuit parameters of the PWM buck converter have been analyzed. The method of using Fourier descriptor to extract output signals characteristics is put forward and proved to be a gist of identifying and classifying the behavior of DC DC converter. This method can establish a good foundation fo...展开更多
A modified Fourier descriptor was presented. Information from a local space can be used more efficiently. After the boundary pixel set of an object was computed, centroid distance approach was used to compute shape si...A modified Fourier descriptor was presented. Information from a local space can be used more efficiently. After the boundary pixel set of an object was computed, centroid distance approach was used to compute shape signature in the local space. A pair of shape signature and boundary pixel gray was used as a point in a feature space. Then, Fourier transform was used for composition of point information in the feature space so that the shape features could be computed. It is proved theoretically that the shape features from modified Fourier descriptors are invariant to translation, rotation, scaling, and change of start point. It is also testified by measuring the retrieval performance of the systems that the shape features from modified Fourier oescriptors are more discriminative than those from other Fourier descriptors.展开更多
Y2000-62357-370 0018805应用彩色编码格册和非均匀有理 Bezier 样条的高判决3维目标识别=A high precision 3D object reconstruc-tion method using a color coded grid and NURBS[会,英]/Lavoie,P.& Ionescu,D.//Proceedings of ...Y2000-62357-370 0018805应用彩色编码格册和非均匀有理 Bezier 样条的高判决3维目标识别=A high precision 3D object reconstruc-tion method using a color coded grid and NURBS[会,英]/Lavoie,P.& Ionescu,D.//Proceedings of 10thInternational Conference on Image Analysis and Process-ing.—370～375(HC)Y2000-62357-478 0018806应用子波分组和傅里叶描述符号水下沉没目标识别=Underwater buried object recognition using wavelet pack-ets and Fourier descriptors[会,英]/Boulinguez,D.&Quinquis,A.//Proceedings of 10th International Confer-ence on Image Analaysis and Processing.—478～483(HC)展开更多
文摘The precondition of realizing feedback controlling DC DC converter to avoid chaotic state is to judge the behavior of the converter and take corresponding measures. In this paper, the output signals under different circuit parameters of the PWM buck converter have been analyzed. The method of using Fourier descriptor to extract output signals characteristics is put forward and proved to be a gist of identifying and classifying the behavior of DC DC converter. This method can establish a good foundation fo...
基金Project(60873010)supported by the National Natural Science Foundation of ChinaProject supported by the Doctor Startup Foundation of Shenyang University of Technology,China
文摘A modified Fourier descriptor was presented. Information from a local space can be used more efficiently. After the boundary pixel set of an object was computed, centroid distance approach was used to compute shape signature in the local space. A pair of shape signature and boundary pixel gray was used as a point in a feature space. Then, Fourier transform was used for composition of point information in the feature space so that the shape features could be computed. It is proved theoretically that the shape features from modified Fourier descriptors are invariant to translation, rotation, scaling, and change of start point. It is also testified by measuring the retrieval performance of the systems that the shape features from modified Fourier oescriptors are more discriminative than those from other Fourier descriptors.
文摘Y2000-62357-370 0018805应用彩色编码格册和非均匀有理 Bezier 样条的高判决3维目标识别=A high precision 3D object reconstruc-tion method using a color coded grid and NURBS[会,英]/Lavoie,P.& Ionescu,D.//Proceedings of 10thInternational Conference on Image Analysis and Process-ing.—370～375(HC)Y2000-62357-478 0018806应用子波分组和傅里叶描述符号水下沉没目标识别=Underwater buried object recognition using wavelet pack-ets and Fourier descriptors[会,英]/Boulinguez,D.&Quinquis,A.//Proceedings of 10th International Confer-ence on Image Analaysis and Processing.—478～483(HC)
