Long overdue post, "Stable Filtering - Part 1", which discusses a seemingly overlooked filtering concept important to motion compensation filters: https://caseymuratori.com/blog_0035 Special treat: images of the total garbage produced by the h.264 / HEVC filters when applied multiple times.
We are talking entirely about 1D filtering here. There is no "layout" (no 3x2 or 2x3). It is 6-wide or 8-wide. In actual use, you apply the filter twice if you want to move a half-pixel in both X and Y (one horizontal application, one vertical application).
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I see! And may I ask, if you are e.g. shifting left do you apply the filter on the six pixels to the left or the right?
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Neither. You're computing a value in between two pixels, so the coefficients apply to the 3 pixels before and 3 pixels after that border. (Or 4 and 4 for 8-tap filters).
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