VIDEO ENCODING METHOD AND APPARATUS AND VIDEO DECODING METHOD AND APPARATUS

• US 20070036216A1
• Filed: 09/27/2006
• Published: 02/15/2007
• Est. Priority Date: 01/18/2002
• Status: Abandoned Application

• Current Assignee: Shinichiro Koto, Takeshi Chujo, Takeshi Nagai, Wataru Asano, Yoshihiro Kikuchi
• Original Assignee: Shinichiro Koto, Takeshi Chujo, Takeshi Nagai, Wataru Asano, Yoshihiro Kikuchi
• Inventors: Chujoh, Takeshi, Asano, Wataru, Koto, Shinichiro, Nagai, Takeshi, Kikuchi, Yoshihiro
• Application Number:
  US11/535,856
• Publication Number:
  US 20070036216A1
• Time in Patent Office: Days
• US Class Current: 375/240.120
• CPC Class Codes: H04B 1/662 using a time/frequency relationship, e.g. time compression or expansion
• CPC Class Codes: H04N 19/00 Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
• 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 19/124 Quantisation
• CPC Class Codes: H04N 19/132 Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
• CPC Class Codes: H04N 19/136 Incoming video signal characteristics or properties
• CPC Class Codes: H04N 19/137 Motion inside a coding unit, e.g. average field, frame or block difference
• CPC Class Codes: H04N 19/142 Detection of scene cut or scene change
• CPC Class Codes: H04N 19/152 by measuring the fullness of the transmission buffer
• CPC Class Codes: H04N 19/172 the region being a picture, frame or field
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• 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 19/463 by compressing encoding parameters before transmission
• CPC Class Codes: H04N 19/503 involving temporal prediction adaptive coding with adaptive selection between spatial and temporal predictive coding H04N19/107; adaptive coding with adaptive selection among a plurality of temporal predictive coding modes H04N19/109
• CPC Class Codes: H04N 19/52 by predictive encoding
• 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 19/577 Motion compensation with bidirectional frame interpolation, i.e. using B-pictures
• CPC Class Codes: H04N 19/58 Motion compensation with long-term prediction, i.e. the reference frame for a current frame not being the temporally closest one H04N19/23 takes precedence
• 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 picture is encoded by adaptively switching between the operation of using a plurality of decoded video signals as reference frames and generating a predictive macroblock picture from a plurality of reference frames for each macroblock, the operation of extracting reference macroblocks from a plurality of reference frames and using the average value of the macroblocks as a predictive macroblock picture, and the operation of extracting reference macroblocks from a plurality of reference frames and generating a predictive macroblock picture by linear extrapolation or linear interpolation in accordance with the inter-frame distances between the reference frames and a to-be-encoded frame.

Claims

1. A video encoding method of performing motion compensated prediction inter-frame encoding on each of to-be-encoded blocks contained in a to-be-encoded frame of an input video, comprising:

selecting, for each to-be-encoded block, one of a first prediction block generating mode of generating a prediction block signal from a single reference frame and a second prediction block generating mode of generating the prediction block signal by a linear sum of a plurality of reference blocks extracted from a plurality of reference frames;

encoding a differential signal between the selected prediction block signal and a signal of the to-be-encoded block;

selecting, for each set of a plurality of pixel blocks in the to-be-encoded frame or for each to-be-encoded frame, as the linear sum prediction an average value prediction based on the plurality of reference blocks or a linear interpolation prediction based on the plurality of reference frames and a display time of the to-be-encoded frame;

encoding, for each to-be-encoded block or each set of a plurality of to-be-encoded blocks, first encoding mode information indicating that a specific one of the first and second prediction block generating modes is selected at the time of generation of the prediction block signal; and

encoding, for each set of a plurality of pixel blocks of the to-be-encoded frame or for each to-be-encoded frame, second encoding mode information indicating a specific one of the average value prediction and the linear interpolation prediction, which is selected as the linear sum prediction.

2. A video encoding apparatus of performing motion compensated prediction inter-frame encoding on each of to-be-encoded blocks contained in a to-be-encoded frame of an input video, comprising:

a first selector to select, for each to-be-encoded block, one of a first prediction block generating mode of generating a prediction block signal from a single reference frame and a second prediction block generating mode of generating the prediction block signal by a linear sum of a plurality of reference blocks extracted from a plurality of reference frames;

an encoder to encode a differential signal between the selected prediction block signal and a signal of the to-be-encoded block; and

a second selector to select, for each set of a plurality of pixel blocks in the to-be-encoded frame or for each to-be-encoded frame, as the linear sum prediction an average value prediction based on the plurality of reference blocks or a linear interpolation prediction based on the plurality of reference frames and a display time of the to-be-encoded frame, wherein

the encoder encodes, for each to-be-encoded block or each set of a plurality of to-be-encoded blocks, first encoding mode information indicating that a specific one of the first and second prediction block generating modes is selected at the time of generation of the prediction block signal, and encodes, for each set of a plurality of pixel blocks of the to-be-encoded frame or for each to-be-encoded frame, second encoding mode information indicating a specific one of the average value prediction and the linear interpolation prediction, which is selected as the linear sum prediction.