此方案可以弥补图像传感器成像面积小的不足。
Such a scheme can cover theshortage of the image sensor' photo-sensitive portion.
因为目标成像面积小只占一个像素，信噪比低，基本上被噪声所淹没，所以给检测带来了极大的困难。
Because the target only occupies one pixel, its SNR is low and the target almost be submerged by noise, these all bring huge difficulty to detection.
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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