公开(公告)号：US20170094272A1

公开(公告)日：2017-03-30

申请号：US15372686

申请日：2016-12-08

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

Inventor： Dmytro RUSANOVSKYY ,  Kemal UGUR

IPC: H04N19/117 ,  H04N19/105 ,  H04N19/523 ,  H04N19/436

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.

公开(公告)号：US20170171557A1

公开(公告)日：2017-06-15

申请号：US15370127

申请日：2016-12-06

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

Inventor： Kemal UGUR ,  Jani LAINEMA ,  Antti HALLAPURO

IPC: H04N19/53 ,  H04N19/176 ,  H04N19/105 ,  H04N19/523

CPC classification number: H04N19/53 ,  G06T7/238 ,  H04N5/145 ,  H04N19/105 ,  H04N19/176 ,  H04N19/523 ,  H04N19/533

Abstract: An apparatus for providing motion estimation for video encoding includes a selection element and a processing element. The selection element is configured to select a subset including less than all of candidate pixel locations from among a plurality of candidate pixel locations used for motion vector determination based on a relationship between a best candidate pixel location of a first level of accuracy and a best candidate pixel location of a second level of accuracy. The processing element is configured to process an input video sequence to determine a motion vector at the first level of accuracy, to refine the motion vector at the second level of accuracy, and to determine the motion vector at a third level of accuracy using only the subset of candidate pixel locations.