点目标的成像面积仅为几个或几十个象素，目标强度相对较弱，无明显的尺寸、形状、纹理信息可供后续处理系统进行分析使用。

The image of point target in the imaging area is only several or dozens of pixels. And its strength is relatively weak and drowned in the noise, no obvious size, shape, texture, and other information.

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获得精确的位置信息的同时不依赖于光斑强度、形状、对称性或尺寸。

Accurate position information is obtained independent of the light spot intensity profile, symmetry or size.

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通过对单个生物气溶胶颗粒空间光散射图形分布的分析，可同时获得其尺寸和形状信息。

Size and shape characterizations are simultaneously acquired for individual bioaerosol particles by analyzing the spatial distribution of scattered light.

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