自适应波门跟踪的关键是准确预测波门的位置和自动调整波门的大小。
The key to adaptive window tracing method is to predict the window's position exactly and to adjust the window's size automatically.
利用分割结果确定目标大小、质心位置，进而实现波门自适应跟踪。
Based on the segmentation result, target size and its mass center are determined, and adaptive gate target tracking is realized.
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