CA2240118A1 - Image sequence coding method and decoding method - Google Patents

Image sequence coding method and decoding method

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Publication number
CA2240118A1
CA2240118A1 CA002240118A CA2240118A CA2240118A1 CA 2240118 A1 CA2240118 A1 CA 2240118A1 CA 002240118 A CA002240118 A CA 002240118A CA 2240118 A CA2240118 A CA 2240118A CA 2240118 A1 CA2240118 A1 CA 2240118A1
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Canada
Prior art keywords
frames
integer
rounding errors
image sequence
sequence coding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002240118A
Other languages
French (fr)
Other versions
CA2240118C (en
Inventor
Yuichiro Nakaya
Yoshito Nejime
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd.
Yuichiro Nakaya
Yoshito Nejime
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Application filed by Hitachi Ltd., Yuichiro Nakaya, Yoshito Nejime filed Critical Hitachi Ltd.
Priority to CA 2318677 priority Critical patent/CA2318677C/en
Priority to CA 2475777 priority patent/CA2475777C/en
Priority to CA 2475779 priority patent/CA2475779C/en
Priority to CA 2475778 priority patent/CA2475778C/en
Publication of CA2240118A1 publication Critical patent/CA2240118A1/en
Application granted granted Critical
Publication of CA2240118C publication Critical patent/CA2240118C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • H04N19/94—Vector quantisation

Abstract

In order to prevent accumulation of rounding errors caused by the integer-based bilinear interpolation used in the motion compensation process of image coding and decoding methods, two types of P frames are used for unidirectional motion compensation prediction; P+ frames, which round the results of bilinear interpolation with real number operations to the nearest integer and rounds half integer values (0. 5 added to an integer) away from zero; and P- framed, which differs from P+ frames in that the above mentioned half integer values are rounded towards zero. Utilizing both of these P+ and P- frames enables canceling of rounding errors and prevents the accumulation of rounding errors.
CA 2240118 1997-06-09 1998-06-08 Image sequence coding method and decoding method Expired - Fee Related CA2240118C (en)

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CA 2318677 CA2318677C (en) 1997-06-09 1998-06-08 Method and apparatus for image decoding
CA 2475777 CA2475777C (en) 1997-06-09 1998-06-08 A recording medium containing positive and negative rounding information related to coded data of an image sequence
CA 2475779 CA2475779C (en) 1997-06-09 1998-06-08 Digital portable terminal and method using positive and negative rounding for pixel value interpolation in motion compensation
CA 2475778 CA2475778C (en) 1997-06-09 1998-06-08 An image coding method and encoder using positive and negative rounding methods while performing motion compensation

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CA 2318677 Division CA2318677C (en) 1997-06-09 1998-06-08 Method and apparatus for image decoding
CA 2475778 Division CA2475778C (en) 1997-06-09 1998-06-08 An image coding method and encoder using positive and negative rounding methods while performing motion compensation
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