由于医学成像过程中存在着各种退化因素，当前各种分割算法仍难以很好满足高层应用的需求。
Due to a variety of degradation factors in medical imaging process, the existed segmentation algorithms are still hard to satisfyingly meet the need of higher layer applications.
其退化模型是原始图像经过算子，或系统经退化因素作用之后和噪声叠加，以形成退化后的图像，即实际得到的图像。
The degenerative model is that original image was passed by operator or was acted on degenerative factor, and noise overlap-added, then, degenerated image was formed.
由于所有这些因素，土地退化对经济增长具有不必要的拖累影响。
When these factors are taken together, land degradation places an unnecessary drag on economic growth.
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