使当前的影像与背景模拟场景相比较，以确定出匹配的标准，例如：地点、经过、目标大小(纠正过的远景)。

It compares the current image with its own background model of the scene and checks out discrepancies for matches with criteria such as location, duration, and object size (corrected for perspective).

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这可能导致不合乎要求的视觉效果(如像素失真)，但可以通过创建对应于所有目标大小和颜色深度的图标来避免这一情况。

This can cause undesirable visual effects, such as pixilation, but may be avoided by creating ICONS for all targeted sizes and color depths.

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爆炸将一枚橘子大小的铜弹射向目标，利用撞击力和弹片摧毁目标。

The blast propelled a tangerine-sized slug of copper down into the target, destroying it with the impact and the accompanying shrapnel.

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