凹陷

Searching for the object's concavities of active contour model is a dynamic optimization problem.

主动轮廓线模型凹陷边界点的寻优属于动态优化问题，由于其复杂性，传统方法不能准确搜索到最佳边界点。

In order to overcome the problems of traditional snake associated with poor convergence to boundary concavities and sensitive initialization,gradient vector flow based on deformable models is presented to segment tumor region.

为了克服传统的蛇形算法不能收敛于边缘凹陷处以及对蛇的初始化过于敏感的缺点，本文提出用基于可变形模型的梯度矢量流方法提取乳腺X光片中的肿瘤区域。

The new method overcomes the disadvantages of the sensitivity of active contour models to its initial position, the poor convergence to boundary concavities which existed in the traditional Snake algorithm, sensitivity to noise and complex computation.

从而克服了参数主动轮廓线模型对初始曲线敏感、噪声敏感和不能收敛到凹陷的边缘问题和几何主动轮廓线模型水平集方法计算量大等问题。

The proposed method can detect certain object boundaries, for which the original method is not applicable. E.g. it can automatically detect interior and exterior contours of an object and edges of multi-objects, starting with only one initial curve whose position is anywhere in the image. Moreover, active contours can move into boundary concavities and perform better in the presence of weak boundaries.

它能够解决原方法所不能解决的一些图像分割问题，例如，能够从任意选取的一条初始曲线出发自动检测目标物体的内外轮廓，检测多目标物体以及深度凹陷区域的边缘，并能较好地提取目标物体的弱边界。

The active contour model is a powerful image segmentation method for representing image contour, but it has three severe difficulties. First, active contour model highly depends on its initial position. Second, active contour model lacks the ability to handle boundary concavities.

动态轮廓模型(active contour model； ACM)是一种功效强大的影像分割描绘方法，但却具有三个严重的缺点：第一、此模型非常依赖待描绘图形的起始位置，第二、此模型缺乏进入图形凹陷处的能力，第三、此模型有停滞在局部能量极小值的倾向。

An undulating skylight ceiling boasts complex concavities and hanging panels that distribute daylight, while an extremely efficient natural ventilation system effectively balances the entire structure's disparate climate zones.

其中连绵起伏的天窗布满了复杂的凹陷和挂板使日光得以自然分散，加上极为高效的自然通风系统有效地平衡了整个结构的不同气候区域。

After repeated studies, we found that gradient vector flow deformable model is robust to model initialization and not stagnant by local energy minimum, but still is difficult to handle boundary concavities. Thus, we develop a modified technique to overcome this drawback. This technique makes active contour further progress into concavities.

经过反覆实作，我们发现GVF较不受模型初始值之影响，而且不会因局部极小能量而停滞，然而此法仍难以进入凹陷处，因此我们也研发了一种改良技术来克服这个缺点。

Some cord to a surface hardness low Corrugating roll also therefore create top cord to boundaries Ma Hang and depression and wear process.

一些楞面硬度低的瓦楞辊还会因此使楞顶楞面产生麻坑和凹陷，加剧了磨损进程。

That wide mouth tilting. The corners of his eyes crinkling. The deep cleft in his cheek he refused to call a dimple.

我可以想像出他的笑容宽宽的嘴巴歪着，眼角皱起，脸颊上露出他拒绝称作酒窝的凹陷&那么你还记得我？&

No cracks, should be in the frame, and there should be no dents or gaps.

没有裂缝，应在框架中，不应该有凹陷或差距。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。