Grabulosaure wrote:The questions are :
Which is better among the Polyphase interpolers ? Are there have visible defects ? No difference ? Which resolution are you using, which filter ?
[Note : I'm still optimising the scaler to achieve higher pixel rates, but these test versions, which implement additional hardware,
support lower freq. than final versions]
Just a note. Due to rounding errors (well the rounding is fine but row sums should be more important), a few of the coefficient sets in the filter repository that should have rows that sum to 128 actually have rows that sum to 127 or 129. The results is slight banding until I go back and fix them. That's not the fault of Grabulosaure's scaler. That's my fault in computing the coefficients and not checking for this carefully.
The ones that I have spotted so far include Gasussian_Sharp_01, Gaussian_Sharp_03, Bicubic.
These banding/line effects can change position based on the polyphase implementaion but aren't the scaler's fault.