gradient vector 中文意思是什麼
gradient vector
解釋
梯度向量-
To corner feature, both gradient magnitude change and direction change of gradient vector are discontinuity in a local image neighborhood, hence gradient - direction variation and gradient magnitude are used as another decision rule of the corner detection to improve antinoise
為了提高抗噪聲，根據角特徵不僅灰度變化是不連續的，且相對周圍其他點的梯度方向也是不連續的，提出利用梯度角變化和梯度幅值作為角特徵檢測的另一個準則。 -
We discuss several different definitions of directional derivative and gradient vector
摘要討論了幾種不同的方向導數和梯度的定義。 -
Dissert concisely about the sort of the gradient characteristic vector
簡論梯度特徵向量排序法 -
Compared with the pressure hydrophone, vector transducer can provide both the information about pressure ( scalar quantity ) and particle velocity ( vector quantity ) of the sound field, which offers more possibilities for signal processing. so vector transducer and its signal processing have attracted the attention of researchers both native and foreign. in this thesis, a method of correlation equations for pressure gradient transducer is presented, and the estimation of multi - signal parameters with single vector transducer is given
與傳統的聲壓水聽器相比，矢量水聽器既能獲得聲場中的聲壓這一標量信息，又能獲得聲場中質點振速這一矢量信息，這為其信號處理帶來更大的空間，因此矢量水聽器及其相應的聯合信息處理技術日益成為國內外科技工作者們研究的熱點。 -
To fulfill the requirement and characteristics of this track, which include paragraph - based and a relevant document supplied by user before retrieval, the rocchio model and vector model are merged to compute relevance between query and document. then, gradient decrease method is used to train the parameters of rocchio model. then, based on the paragraph - level relevance, the sorted documents are returned
本文針對文本檢索大會子項目的要求和基於段落的，用戶查詢時可能提供一篇相關文章的查詢特點，首先將rocchio模型和向量空間演算法結合起來來把握用戶需求並計算文檔與查詢的相關度，再使用梯度下降技術來訓練模型中的參數，最後依據查詢和段落層的相關度，使用基於段落切分的方法返回包含用戶查詢最相關文章。 -
Dealing with faces illumination variation based on dynamic directional gradient vector flow snake and gamma algorithm a new dynamic directional gradient vector flow snake ddgvf snake algorithm was presented which can detect the image shadow and highlight contours of the unknown face images. according to the given standard face database, the image gray median could be c.
使用一種動態方向梯度矢量流snake ddgvf snake演算法來檢測未知圖像的陰影和高光區域，根據已知的標準人臉圖像庫中圖像的灰度分佈，計算出灰度中值，然後採用加權非線性gamma灰度矯正演算法來歸一化待識別圖像的光照變化，使之與已知的標準庫中的圖像灰度一致。 -
The output of vector hydrophone contains the spatial direction information, in the other word, the output has different phase gradient to signal with different direction
它是利用了矢量水聽器四個陣元的輸出所蘊含的空間方位信息，通過對一個方向信號延遲的補償相減達到此方向信號的抵消的目的。 -
Results of experiment b demonstrate that a convergence zone of wind vector and water vapour with dense pressure gradient is formed alone the coast after tc ' s outer circulation encountering land, which results in more precipitation
試驗b的結果顯示，熱帶氣旋外圈環流與陸地接觸後到中心登陸前後，沿海岸線一直存在一條氣壓梯度相對密集的風矢量、水汽輻合帶，引起該處降水增多。 -
In feature extraction step, we apply homogeneity into text detection, and we compare using the gradient, edge extract and homogeneity mapping to enhance corners and texture features, and then use a slip window to get different kinds of texture features as the feature vector, and then after comparing the accuracy result of svm and bp neural network, we choose svm as the classifier
在特徵提取步驟中，本文把一致性h應用到文本區域提取領域，使用邊緣空間映射和一致性h空間映射兩種方法得到特徵圖像，並比較了兩種空間對于文本提取的影響;對得到特徵圖像，使用滑動窗口比較了提取不同維數的紋理特徵作為特徵向量的結果。 -
When tc approaches to coast, under the squeezing effect between tc and land, convergences of wind vector and pressure gradient are intensified between tc " s center and coast, and, a new high wind domain forms
隨著熱帶氣旋不斷接近陸地，由於擠壓作用，二者之間區域的風矢量輻合和氣壓梯度不斷增強，形成新的大風區，造成水平結構的變化。 -
2. study the working principle of the vector transducer, mainly for two - dimensional pressure - gradient transducer. and the experimental results for directional pattern of two - dimensional pressure - gradient vector transducer at frequency 3khz and 5khz are given
重點對本文所要研究的壓差式矢量水聽器進行研究，並運用消聲水池實測數據繪出了二維壓差式矢量水聽器在3khz和5khz下的指向性圖。 -
So the paper combined the fuzzy logic control and recurrent neural network, and the recurrent fuzzy neural network ( rfnn ) controller is introduced into the speedsensorless vector control system. moreover, an online parameter training methodology, which is derived from the lyapunov stability theorem and gradient descent method is proposed to increase the learning capability of the rfnn. the rfnn controller has a better performance than the pi controller system ; the effectiveness of the proposed control scheme is verified by simulation results
因此論文將模糊控制和具有優越動態性能的遞歸神經網路結合起來，取長補短，提出了一種遞歸模糊神經網路控制方法，利用神經網路來實現模糊推理，可動態的調整隸屬函數的形狀、位置以及神經網路遞歸權值，並對其與pi控制器的交流調速控制系統進行了模擬比較，模擬結果表明與普通的pi控制器相比較，遞歸模糊神經網路控制器有較好的動態性能，控制器的收斂速度快、靜差小，系統在遇到參數發生變化和外部不確定性問題時魯棒性、抗擾動性有明顯的提高。 -
The gradient vector can be used to construct the initial errors
這時可以對梯度向量本身進行分析，或者用這個梯度向量構造初始誤差場。 -
There are two methods to optimize the parameters and structures of neuro - fuzzy networks : one is the differential coefficient optimization method based on gradient vector ; the other is based on modern optimization methods, such as genetic methods, simulated annealing etc, in which, the researches on genetic methods are most prominent
目前，對模糊神經網路的權值或結構進行優化的方法有兩類：一類是基於梯度向量的導數優化方法；第二類方法是基於現代最優化技術的非導數優化方法，如遺傳演算法、模擬退火演算法等，其中以遺傳演算法的研究最為突出。 -
Automatic medical image segmentation based on gradient vector flow
結合對心臟序列圖像的分割 -
Detection of motion - target based on improved gradient vector flow snake model
基於改進梯度向量流形變模型的動目標檢測方法 -
Adjoint method provides an efficient tool to calculate the gradient vector of the cost function to the initial field
利用伴隨方法，可以求出該度量函數關于初始場的梯度向量。 -
Therefore the gvf ( gradient vector field ) is used to substitute the traditional potential field and it overcomes the defects of the traditional active contour
於是，我們採用一種梯度向量流場作為外力，從而有效地克服了傳統勢能場的弱點，給曲線的移動以很好的指向。 -
When using modem optimization methods, the gradient vector information of the target function is not necessary, so there is much flexible in solving complex optimization problems
使用現代優化技術時不需要目標函數的梯度向量，因此在解決復雜優化問題時有更大的靈活性。 -
It reduces greatly the computational complexity of matrix - vector multiplication in conjugate gradient iteration improves the efficiency of mlfma while the reasonable accuracy is maintained
該方法在保證合理計算精度的同時大大降低了迭代過程中矩陣矢量相乘的計算復雜度，提高了多層快速多極子方法計算效率。
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