中文说明：对图像进行降采样处理，将原图像变为五分之一大小。
English Description：
The original image is reduced to one fifth of its size by downsampling.
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中文说明：对图像进行降采样处理，将原图像变为五分之一大小。
English Description：
The original image is reduced to one fifth of its size by downsampling.