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- fractional gradient vector 分数阶梯度向量
- We discuss several different definitions of directional derivative and gradient vector. 摘要讨论了几种不同的方向导数和梯度的定义。
- So the gradient threshold and the Gradient Vector Flow(GVF) were introduced into the speed stopping function. 针对传统水平集分割图像会出现演化曲线停止于梯度的局部极大值或孤立的边缘处的缺点,对速度停止项进行了改进。
- So the gradient threshold and the Gradient Vector Flow (GVF) were introduced into the speed stopping function. 该方法将梯度阈值和梯度矢量流引入速度停止项中，利用梯度阈值来使边缘得到更好的保持；
- A new ellipse extraction algorithm based on the ellipse-special deformable templates and gradient vector flow (GVF) was proposed. 摘要给出一种结合梯度矢量流(GVF)及椭圆变形模板的椭圆提取新算法。
- Directional snake can improve the detecting capability by charactering image features not only using gradient but also using the directional information of gradient vector. 方向蛇模型的优点是在模型中不仅运用图像的梯度特性,还充分运用梯度的方向特性,从而提高了图像分割的准确性。
- Therefore,according to features of the contours in fabric drape images,an active contour model(Snakes model)based on the gradient vector flow(GVF) field is proposed to recognize the edges of fabrics. 根据织物悬垂图像的边缘轮廓特点,提出采用基于梯度向量流场(GVF)的动态轮廓模型(Snake模型)来识别织物的边缘轮廓。
- Objective To promote stability and accuracy of gradient vector flow (GVF) deformable models by improving external potential force field of ultrasound images under speckle noisy environments. 结果通过二值加噪图像和心脏超声图像的实验,验证了该方法的捕捉范围和处理噪声方面优于GVF。
- According to the characteristics of these systems, gradient vector flow (GVF) field links segmentation, extraction of skeleton, and registration for speeding the system processing. 根据这些系统的特点，本文提出以梯度矢量流(GVF)场为主线，连贯医学图像的分割，骨架提取和配准等算法，这样做的目的主要是加快系统的处理速度。
- A new method of contour initializaiton was proposed by analyzing the shortcomings of the huge waste of time and the failure of extracting some true contours in Gradient Vector Flow(GVF) Snake model. 通过对梯度矢量流（GVF）力场迭代和轮廓收敛过程中时间开销大、不能逼近较复杂轮廓等不足之处的分析，提出了一种新的初始轮廓线的设置方法。
- multiscale gradient vector field 多尺度梯度矢量场
- degenerated minimal surface gradient vector flow 退化最小曲面梯度矢量流
- GVF-Snake (Gradient Vector Flow-Snake) Model GVF-Snake模型
- Gradient Vector Flow (GVF)-Snake Model 基于梯度矢量流的活动轮廓模型
- Speech is fractional; silence is integral. 讲话是分数; 沉默是整数。
- And by using the gradient vectors of the feature point, we can obtain rotate angle, major diameter and minor diameter in each subimage. (2)在各子图中由边界点梯度向量和候选形心座标，获得椭圆旋转角和长短轴比率；
- The soil absorbs only a fraction of the rain that beats down. 土壤只吸收猛打到地面上的雨水的一部分。
- I'll be ready in a fraction of a second. 我马上就好。
- The story does not contain a fraction of truth. 这故事没有一点真实性。
- He has done only a fraction of his homework. 他只做了家庭作业的一小部分。
