METHOD AND A SYSTEM FOR VIDEO SIGNAL ENCODING AND DECODING WITH MOTION ESTIMATION

• US 20140044181A1
• Filed: 08/11/2013
• Published: 02/13/2014
• Est. Priority Date: 08/13/2012
• Status: Abandoned Application

• Current Assignee: Politechnika Poznanska
• Original Assignee: Politechnika Poznanska
• Inventors: Siast, Jakub, Domanski, Marek
• Application Number:
  US13/964,082
• Publication Number:
  US 20140044181A1
• Time in Patent Office: Days
• US Class Current: 375/240.16
• CPC Class Codes: H04N 19/109 among a plurality of temporal predictive coding modes
• CPC Class Codes: H04N 19/147 according to rate distortion criteria rate-distortion as a criterion for motion estimation H04N19/567
• CPC Class Codes: H04N 19/157 Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/19 using optimisation based on Lagrange multipliers
• CPC Class Codes: H04N 19/513 Processing of motion vectors
• CPC Class Codes: H04N 19/52 by predictive encoding
• CPC Class Codes: H04N 19/521 for estimating the reliability of the determined motion vectors or motion vector field, e.g. for smoothing the motion vector field or for correcting motion vectors
• CPC Class Codes: H04N 19/593 involving spatial prediction techniques
• CPC Class Codes: H04N 19/61 in combination with predictive coding

Abstract

A computer-implemented method for video signal encoding with motion estimation, the video signal comprising frames divided into prediction units, the method comprising the steps of: determining (401) the current prediction unit (PU_X) to be encoded, creating (407) a list (L_MVXpred) comprising motion vector predictions (MV_PUY) from neighboring units (PU_Y), selecting (411) from the list (L_MVXpred) the motion vector prediction which is the best according to a predetermined cost function for encoding the current prediction unit (PU_X), using (412) the selected prediction number to encode the current prediction unit (PU_X). The method further comprises the steps of: for each neighboring unit (PU_Y), checking (403) whether the neighboring unit (PU_Y) has been encoded in the MERGE and not SKIP mode and if so, determining (404) the reconstruction motion vector (MV_PUYrec) for that unit (PU_Y) as a motion vector which minimizes difference between reconstructed prediction block (PU_Y) and a block in a reference frame pointed by this motion vector, and assigning (405) the reconstruction motion vector (MV_PUYrec) as a motion vector (MV_PUY) to that unit (PU_Y) to be used in creating (407) the list (L_MVXpred).

Claims

1. A computer-implemented method for video signal encoding with motion estimation, said video signal comprising frames divided into prediction units, said method comprising the steps of:

determining (401) a current prediction unit (PU_X) to be encoded,

creating (407) a list (L_MVXpred) comprising motion vector predictions (MV_PUY) from neighboring units (PU_Y),

selecting (411) from said list (L_MVXpred) the motion vector prediction which is the best according to a predetermined cost function for encoding said current prediction unit (PU_X)

using (412) said selected prediction number to encode said current prediction unit (PU_X)

wherein said method further comprises the steps of;

for each neighboring unit (PU_Y), checking (403) whether said neighboring unit (PU_Y) has been encoded in the MERGE and not SKIP mode and if so,

determining (404) a reconstruction motion vector (MV_PUYrec) for that unit (PU_Y) as a motion vector which minimizes difference between reconstructed prediction block (PU_Y) and a block in a reference frame pointed by this motion vector, and

assigning (405) said reconstruction motion vector (MV_PUYrec) as a motion vector (MV_PUY) to that unit (PU_Y) to be used in creating (407) said list (L_MVXpred).

2. A computer readable medium comprising program code means for performing all the steps of the method according to claim 1 when said program is run on a computer.

5. A computer-implemented method for transmitting a video signal, comprising the steps of encoding said video signal according to the method of claim 1 and decoding said video signal according to the method of claim 3.

3. A computer-implemented method for video signal decoding with motion estimation, said video signal comprising frames divided into prediction units, said method comprising the steps of:

determining (501) a current prediction unit (PU_X) to be decoded,

determining (502) from encoded stream information a neighboring unit (PU_Y) whose motion vector shall be used to decode said current prediction unit (PU_X),

using (507) a motion vector (MV_PUY) of said neighboring unit (PU_Y) to decode motion information in said current prediction unit (PU_X),

wherein said method further comprises the steps of;

checking (503) whether said neighboring unit (PU_Y) has been encoded in the MERGE and not SKIP mode and if so,

determining (504) a reconstruction motion vector (MV_PUYrec) for that unit (PU_Y) as a motion vector which minimizes difference between reconstructed prediction block (PU_Y) and a block in a reference frame pointed by this motion vector, and

assigning (505) said reconstruction motion vector (MV_PUYrec) as a motion vector (MV_PUY) to that unit (PU_Y) to be used in decoding said current prediction unit (PU_X) motion information.

4. A computer readable medium comprising program code means for performing all the steps of the method according to claim 3 when said program is run on a computer.

6. A video signal encoder utilizing motion estimation, said video signal comprising frames divided into prediction units, said encoder comprising:

a motion estimation unit (104) configured to;

determine (401) a current prediction unit (PU_X) to be encoded,

create (407) a list (L_MVXpred) comprising motion vector predictions (MV_PUY) from neighboring units (PU_Y),

select (411) from said list (L_MVXpred) the motion vector prediction which is the best according to a predetermined cost function for encoding said current prediction unit (PU_X),

use (412) said selected prediction number to encode said current prediction unit (PU_X)

a prediction correction unit (151) configured to;

for each neighboring unit (PU_Y), check (403) whether said neighboring unit (PU_Y) has been encoded in the MERGE and not SKIP mode and if so,

determine (404) a reconstruction motion vector (MV_PUYrec) for that unit (PU_Y) as a motion vector which minimizes difference between reconstructed prediction block (PU_Y) and a block in a reference frame pointed by this motion vector, and

assign (405) said reconstruction motion vector (MV_PUYrec) as a motion vector (MV_PUY) to that unit (PU_Y) to be used in creating (407) the list (L_MVXpred).

8. A video signal transmission system, comprising the video signal encoder according to claim 6 and the video signal decoder according to claim 7.

7. A video signal decoder utilizing motion estimation, the video signal comprising frames divided into prediction units, the decoder comprising:

a motion estimation unit (204) configured to;

determine (501) a current prediction unit (PU_X) to be decoded, determine (502) from the encoded stream information a neighboring unit (PU_Y) whose motion vector shall be used to decode the current prediction unit (PU_X),

use (507) the motion vector (MV_PUY) of the neighboring unit (PU_Y) to decode motion information in the current prediction unit (PU_X),

a prediction correction unit (251) configured to;

check (503) whether the neighboring unit (PU_Y) has been encoded in a MERGE and not SKIP mode and if so,

determine (504) a reconstruction motion vector (MV_PUYrec) for that unit (PU_Y) as a motion vector which minimizes difference between reconstructed prediction block (PU_Y) and a block in a reference frame pointed by this motion vector, and

assign (505) said reconstruction motion vector (MV_PUYrec) as a motion vector (MV_PUY) to that unit (PU_Y) to be used in decoding said current prediction unit (PU_X).