Sharpening filter for image

[x265]

Which sharpening filter should i use to fix blurred pictures?

[geometer]

don't you mean video?

http://forum.doom9.org/showthread.php?t=172997
this is a formula for (non anime) movies; tuned to NTSC source DVDs.
basically you will test convolutional kernels and then fine-tune other details.
but I started the whole thing long time ago with a paintshop program that allowed to enter 7x7 matrix coefficients for free experimenting.