这种融合利用了红外图像目标轮廓信息约束可见光图像中动态轮廓线的收敛形状，有效地提高了可见光图像目标跟踪的准确性。
In this fusion, the dynamic contour's convergent shape in visible image is restricted by the target's contour in IR image. This fusion improves dynamic contour's tracking accuracy effectively.
裂缝产生的原因主要是早期收敛变形，地质条件复杂多变，隧洞断面形状不当，新奥法施工运用欠妥等。
Major causes of cracks are contraction deformation in early stage, too complicated and changeable geologic setting, improper section shape of the tunnel, wrong practice of NATM construction, etc.
收敛精度对粒子的尺度和形状有很强的依赖性。
The convergence accuracy depends strongly on the particle size and shape.
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