狄拉克下采样

Dirac sampling。狄拉克下采样。

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《An edge-guided image interpolation algorithm via directional filtering and data fusion》

The downsampling process considered in this paper, through which an LR image is generated from the corresponding HR image, is ideal Dirac sampling.  An alternative model of LR images is that of low-pass filtering followed by downsampling.

本文所考虑的下采样过程是理想的dirac采样过程，它是从相应的HR图像生成LR图像的过程。

LR图像的另一种模型是低通滤波和下采样。

In our experiments we also simulated the latter model and created LR test images by downsampling of low-pass filtered HR images (averaging of four pixels in a 2 2 window).

在我们的实验中，我们还模拟了后者的模型，并通过对低通滤波的HR图像进行下采样，生成了LR测试图像。 (2*2窗口中4个像素的平均值)