公开(公告)号：US09769490B2

公开(公告)日：2017-09-19

申请号：US13962009

申请日：2013-08-08

Applicant: Core Wireless Licensing S.a.r.l.

Inventor： Dmytro Rusanovskyy ,  Kemal Ugur

IPC: H04N19/523 ,  H04N7/12 ,  H04N19/117 ,  H04N19/136 ,  H04N19/63 ,  H04N19/42

CPC classification number: H04N19/523 ,  H04N7/12 ,  H04N19/105 ,  H04N19/117 ,  H04N19/136 ,  H04N19/172 ,  H04N19/182 ,  H04N19/42 ,  H04N19/436 ,  H04N19/63

Abstract: In digital video image encoding and decoding, a filter type is selected based on symmetrical properties of the images and coefficient values of an interpolation filter are calculated based on the selected filter type. Coefficient values, filter tap-length and selected filter-type are provided in the encoded video data. Coefficient values are also calculated based on a prediction signal representative of the difference between a video frame and a reference image. The prediction signal is calculated from the reference image based on a predefined base filter and motion estimation performed on the video frame. The predefined base filter has fixed coefficient values. Coefficient values are selected from interpolation of pixel values in a selected image segment in the video frame. Symmetry properties of images can be a vertical symmetry, a horizontal symmetry and a combination thereof, so that only a portion of the filter coefficients are coded.