VIDEO ENCODING/DECODING METHOD AND APPARATUS

• US 20100027627A1
• Filed: 10/09/2009
• Published: 02/04/2010
• Est. Priority Date: 04/18/2002
• Status: Abandoned Application

• Current Assignee: Shinichiro Koto, Takeshi Chujo, Yoshihiro Kikuchi
• Original Assignee: Shinichiro Koto, Takeshi Chujo, Yoshihiro Kikuchi
• Inventors: Chujoh, Takeshi, Kikuchi, Yoshihiro, Koto, Shinichiro
• Application Number:
  US12/576,760
• Publication Number:
  US 20100027627A1
• Time in Patent Office: Days
• US Class Current: 375/240.120
• CPC Class Codes: H04N 19/103 Selection of coding mode or of prediction mode
• CPC Class Codes: H04N 19/105 Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
• CPC Class Codes: H04N 19/107 between spatial and temporal predictive coding, e.g. picture refresh
• CPC Class Codes: H04N 19/126 Details of normalisation or weighting functions, e.g. normalisation matrices or variable uniform quantisers
• CPC Class Codes: H04N 19/139 Analysis of motion vectors, e.g. their magnitude, direction, variance or reliability
• CPC Class Codes: H04N 19/174 the region being a slice, e.g. a line of blocks or a group of blocks
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/423 characterised by memory arrangements H04N19/433 takes precedence
• CPC Class Codes: H04N 19/46 Embedding additional information in the video signal during the compression process H04N19/517, H04N19/68, H04N19/70 take precedence
• CPC Class Codes: H04N 19/51 Motion estimation or motion compensation
• CPC Class Codes: H04N 19/573 Motion compensation with multiple frame prediction using two or more reference frames in a given prediction direction
• CPC Class Codes: H04N 19/61 in combination with predictive coding
• CPC Class Codes: H04N 19/70 characterised by syntax aspects related to video coding, e.g. related to compression standards

Abstract

A video encoding method comprises selecting one combination, for each block of an input video signal, from a plurality of combinations each including a predictive parameter and at least one reference picture number determined in advance for the reference picture, generating a prediction picture signal in accordance with the reference picture number and predictive parameter of the selected combination, generating a predictive error signal representing an error between the input video signal and the prediction picture signal, and encoding the predictive error signal, information of the motion vector, and index information indicating the selected combination.

Claims

1. A video decoding method for decoding encoded data obtained by subjecting a video image having a luminance and two color differences to prediction encoding to reproduce the video image, comprising:

receiving encoded data obtained by encoding, for one or more to-be-decoded blocks, a plurality of combinations comprising (1) a weighting factor every luminance and two color differences, (2) an offset every luminance and two color differences, (3) a flag indicating presence or non-presence of the weighting factor and offset concerning a luminance and (4) a flag indicating presence or non-presence of the weighting factor and offset concerning color differences, and encoding, for a to-be-decoded block, (A) a quantized orthogonal transform coefficient of a prediction error signal concerning a luminance and two color differences and (B) an index indicating (a) one combination of the plurality of combinations and (b) a reference image;

deriving, for the to-be-decoded block, the weighting factor and the offset from the index information and the plurality of combinations;

generating a prediction image by multiplying the reference image by the weighting factor and adding the offset;

generating a prediction error signal by subjecting the quantized orthogonal transform coefficient to inverse quantization and inverse orthogonal transform; and

generating a decoded image signal by calculating a sum of the prediction error signal and the prediction image.