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在计算信号的协方差矩阵时，对图像分块并用椭圆窗滑动求局部协方差矩阵，以达到局部自适应的去噪目的。
When the signal covariance is calculated, the image is cut into several blocks and the elliptic window is used, so the local covariance is achieved.
一圆形或椭圆形的装饰窗。
卷轴式百叶窗带有尺寸大约？英寸高的塑料椭圆形板条。
The roll-up blinds have plastic oval-shaped slats that measure about ? inch tall.
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