Efficient coding apparatus for picture signal and decoding apparatus therefor

• US 5,539,466 A
• Filed: 09/26/1994
• Issued: 07/23/1996
• Est. Priority Date: 07/30/1991
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Sato, Tomoyuki, Igarashi, Katsuji
• Primary Examiner(s): Chin, Tommy P.
• Assistant Examiner(s): LIN, BRYAN T
• Application Number:
  US08/312,434
• Time in Patent Office: 666 Days
• Field of Search: 348/411, 348/412, 348/413, 348/414, 348/415, 348/416, 348/409, 348/407, 348/404, 348/403, 348/402, 348/401, 348/400, 348/390, 348/384
• US Class Current: 375/240.15
• CPC Class Codes: H04N 19/00 Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
• 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 19/112 according to a given display mode, e.g. for interlaced or progressive display mode
• CPC Class Codes: H04N 19/124 Quantisation
• CPC Class Codes: H04N 19/137 Motion inside a coding unit, e.g. average field, frame or block difference
• CPC Class Codes: H04N 19/146 Data rate or code amount at the encoder output
• 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 19/503 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 19/51 Motion estimation or motion compensation
• CPC Class Codes: H04N 19/527 Global motion vector estimation
• CPC Class Codes: H04N 19/577 Motion compensation with bidirectional frame interpolation, i.e. using B-pictures
• 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
• CPC Class Codes: H04N 19/85 using pre-processing or post-processing specially adapted for video compression
• CPC Class Codes: H04N 19/98 Adaptive-dynamic-range coding [ADRC]

Abstract

An apparatus for coding a moving picture in which one frame is comprised of two fields, includes a coder such that, with respect to all blocks in a frame, the odd field (the first field) and the even field (second field) are divided into blocks, thus permitting motion prediction of the second field from the first field, a coder means adapted for switching, every macro block, whether or not a frame is divided into the first field and the second field to generate block data to adaptively switch these coders every frame, thereby making it possible to obtain a picture of a high picture quality with a lesser quantity of information, to reduce the scale of hardware, and to reduce the capacity of a decoder.

Claims

1. A high efficiency encoding method for a sequence of frame pictures, each frame picture being comprised of plural macroblocks, each of said frame pictures having a first field picture and a second field picture, comprising the steps of:

selecting either a first encoding mode or a second encoding mode on a frame picture basis;

when said first encoding mode is selected, carrying out orthogonal transform encoding of said plural macroblocks by adaptively selecting on a macroblock basis either a frame processing mode for orthogonally transforming a block comprised of a first field component and a second field component, or a field processing mode for orthogonally transforming a block comprised of either said first field component or said second field component; and

when said second encoding mode is selected, carrying out orthogonal transform encoding of a block composed only of said first field component for one frame picture and then carrying out orthogonal transform encoding of a block composed only of said second field component for one frame picture so that said second field component of said block can be predicted by using said first field component of said block.