centroid analysis 中文意思是什麼
centroid analysis
解釋
圖心分析-
To improve the performance of the traditional icp method for the large data models of mesh watermarking, this thesis develops a new icp variant based on the framework of mesh multiresolution analysis. the author presents a novel method for acquiring the initial approximate transformation in terms of the distribution feature of points around the centroid
為避免迭代落入局部而非全局最優解，本方法利用網格的多解析度表示特性和網格上點到質心距離分佈的特徵信息，快速有效地確定初始矩陣。 -
In training process, we use kernel - based fisher discrimination analysis ( kfda ) method to train the input sample vectors. the method has been used in face recognition and has been demonstrated better recognition capability than other methods ( pca, kpca, svm ). we calculate the optimal subspace wopt and project the sample gait sequences to wopt, then get the tracks of the sequences, calculate the track centroid and calculate the exemplar projection centroid of the sequences in the same class, and the exemplar projection centroid represents the class template. to test the class of a gait sequence, we also project the test sequence to the eigenspace, and calculate the track centroid, then calculate the euclidean distance of the test sequence tracking centroid with the sample sequences ’ exemplar projection centroids. and the class which the test sequence belongs to is the one that the sample sequence which the euclidean distance is shortest belongs to
該方法在人臉識別的研究中已有採用並在同樣測試條件下取得比其他識別方法更好的識別性能。採用kfda方法取得最優特徵空間wopt ，把步態樣本序列映射到wopt中，取得樣本序列在特徵空間中的軌跡，計算軌跡質心，把同類樣本序列的軌跡質心進行平均求得該類的標本投影軌跡質心，作為該類的模板。在識別時，將測試序列也投影到特徵空間中，取得序列軌跡質心，對測試序列軌跡質心與樣本的標本投影軌跡質心計算它們的歐氏距離。 -
The emphasis is put on the spatial angle identification of the unsolved jamming signal in the time and frequency field. two methods of the spatial angle separation is given : the clustering analysis and the power centroid track, and the advantages and the shortcomings of these methods are discussed with the theoretical analysis and the emulational result
本文重點研究了對于多個時域、頻域均不可分辨的干擾信號如何從空間角度上進行分辨，提出了兩種角度分辨的方法，聚類分析法和能量重心跟蹤法，並結合理論分析和模擬的結果，討論了這兩種方法的優缺點。 -
The used value of doppler centroid influence the imaging result very much, so it must be estimated precisely. the estimating methods contain time domain method and frequency domain method. time - frequency analysis method can be used to improve estimating precision
多普勒中心頻率的取值對成像效果有很大影響，必須精確估計，估計方法有時域方法及頻域方法，還可利用時頻分析方法提高估計精度是。
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