...目标数变化；空间直方图 中图分类号：TP391; TN911.73 文献标志码：A doi：10.3969/j.issn.1003-501X.2010.01.12 [gap=1017]Key words: multi-target tracking; particle filter; variable target number; spatial histogram ..
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叶片数量及叶数增长率的变化暗示物质生产的变化和投入目标的变化。
Number of leaves and its increasing rate implied that the change of the matter production and invested target.
方法使用微持续、微间隔方法，调节刺激物的显示屏数，根据目标的对比度变化来判定掩蔽效应的强弱。
Methods Micro-persistence and interval process, modulate the displaying screen number of the stimulators to determine the strength of masking effect by the contrast of object.
而当目标数未知或随时间变化时，需要对不同目标数的跟踪进行比较。
However, when the number of objects to track is unknown or varies over time, tracking hypothesis with different Numbers of objects have to be compared.
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