Shape and symmetry design for filters in video/image coding

摘要

An apparatus includes a video/image encoder configured to design a two-dimensional star-shaped spatial filter and encode image/video information using the X-shaped spatial filter. The star-shaped spatial filter includes a first linear arrangement of coefficients that extend outwardly in a first diagonal direction from a center pixel coefficient, a second linear arrangement of coefficients that extend outwardly in a second diagonal direction, and two linear arrangements of coefficients that extend outwardly in horizontal and vertical directions from the center pixel coefficient from the center pixel coefficient. The second diagonal direction is oriented in a different direction relative to the first diagonal direction.

主权项

1. An apparatus comprising:
an image processing circuitry including: a video/image encoder configured to design a two-dimensional star-shaped spatial filter and encode image/video information using the star-shaped spatial filter, the star-shaped spatial filter comprising:
a first linear arrangement of coefficients that extend outwardly in a first diagonal direction from a center pixel coefficient;a second linear arrangement of coefficients that extend outwardly in a second diagonal direction from the center pixel coefficient;a third linear arrangement of coefficients that extend outwardly in a horizontal direction from the center pixel coefficient; anda fourth linear arrangement of coefficients that extend outwardly in a vertical direction from the center pixel coefficient, wherein the second diagonal direction is oriented in a different direction relative to the first diagonal direction, and wherein at least one of a first coefficient and a second coefficient of the star-shaped spatial filter comprise point symmetry about the center pixel coefficient.