resample 方法更多的应用场合是 freq 发生改变的时候，这时操作就分为升采样（upsampling）和降采样（downsampling）两种。具体的区别都体现在参数里。
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Polyphase Downsampling 多相下采样
cyclic downsampling 迭次下采样
downsampling lattice 抽样栅格
DCT-based downsampling DCT域下采样
以上来源于: WordNet
The function performs the downsampling step of the Gaussian pyramid construction. First, it convolves the source image with the kernel.
该函数执行高斯金字塔结构下采样的步骤。首先，它与内核的源图像进行卷积。
The image processing apparatus performs a downsampling process on image data, and supplies the image data after the downsampling process to a display device as image data for use in a display.
本发明的图像处理装置，对图像数据进行间拔处理，并将间拔处理后的图像数据作为显示用的图像数据供给图像显示装置。
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