通过构造一个与目标区域内接椭圆的相似椭圆，利用其长轴和短轴确定核函数带宽。
Through structuring an ellipse being similar with target window's inscribes ellipse, it use major axis and minor axis to identify band.
通过构造一个与目标区域内接椭圆的相似椭圆，利用其长轴和短轴确定核函数带宽。
Through structuring an ellipse being similar with target window's inscribes ellipse, it use major axis and minor axis to identify band.
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