CA2475779A1 - Digital portable terminal and method using positive and negative rounding for pixel value interpolation in motion compensation - Google Patents

Digital portable terminal and method using positive and negative rounding for pixel value interpolation in motion compensation Download PDF

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Publication number
CA2475779A1
CA2475779A1 CA002475779A CA2475779A CA2475779A1 CA 2475779 A1 CA2475779 A1 CA 2475779A1 CA 002475779 A CA002475779 A CA 002475779A CA 2475779 A CA2475779 A CA 2475779A CA 2475779 A1 CA2475779 A1 CA 2475779A1
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Canada
Prior art keywords
motion compensation
rounding method
image
pixel value
current frame
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
CA002475779A
Other languages
French (fr)
Other versions
CA2475779C (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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd., Yuichiro Nakaya, Yoshito Nejime filed Critical Hitachi Ltd.
Priority claimed from CA 2240118 external-priority patent/CA2240118C/en
Publication of CA2475779A1 publication Critical patent/CA2475779A1/en
Application granted granted Critical
Publication of CA2475779C publication Critical patent/CA2475779C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Studio Devices (AREA)

Abstract

The present invention relates to a digital portable terminal. The terminal is comprised of an antenna for sending digital signals and an input device for acquiring image information. A frame memory is provided for recording a decoded image of a reference frame. A block matching section for estimates motion vectors and synthesizes a predicted image of a current frame by performing motion compensation between the decoded image of the reference frame and an input image of the current frame. A DCT converter is provided for performing DCT conversion of a difference between the input image of the current frame and the predicted image of the current frame to obtain DCT coefficients. A quantizer quantizes the DCT coefficients. A multiplexer is provided for multiplexing information related to quantized DCT coefficients, the motion vectors and a rounding method used for pixel value interpolation in the motion compensation. The block matching section includes a rounding method determination unit which decides whether a positive rounding method or a negative rounding method is used for pixel value interpolation in the motion compensation. The synthesizing of the predicted image is performed using the decided rounding method and the motion vectors. The antenna sends multiplexed coded information.
CA 2475779 1997-06-09 1998-06-08 Digital portable terminal and method using positive and negative rounding for pixel value interpolation in motion compensation Expired - Fee Related CA2475779C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP15065697 1997-06-09
JP9-150656 1997-06-09
CA 2240118 CA2240118C (en) 1997-06-09 1998-06-08 Image sequence coding method and decoding method

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA 2240118 Division CA2240118C (en) 1997-06-09 1998-06-08 Image sequence coding method and decoding method

Publications (2)

Publication Number Publication Date
CA2475779A1 true CA2475779A1 (en) 1998-12-09
CA2475779C CA2475779C (en) 2005-10-25

Family

ID=25680294

Family Applications (4)

Application Number Title Priority Date Filing Date
CA 2475779 Expired - Fee Related 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 2318677 Expired - Fee Related CA2318677C (en) 1997-06-09 1998-06-08 Method and apparatus for image decoding
CA 2475778 Expired - Fee Related CA2475778C (en) 1997-06-09 1998-06-08 An image coding method and encoder using positive and negative rounding methods while performing motion compensation
CA 2475777 Expired - Fee Related 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

Family Applications After (3)

Application Number Title Priority Date Filing Date
CA 2318677 Expired - Fee Related CA2318677C (en) 1997-06-09 1998-06-08 Method and apparatus for image decoding
CA 2475778 Expired - Fee Related CA2475778C (en) 1997-06-09 1998-06-08 An image coding method and encoder using positive and negative rounding methods while performing motion compensation
CA 2475777 Expired - Fee Related 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

Country Status (1)

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CA (4) CA2475779C (en)

Also Published As

Publication number Publication date
CA2475779C (en) 2005-10-25
CA2475777A1 (en) 1998-12-09
CA2475778A1 (en) 1998-12-09
CA2318677A1 (en) 1998-12-09
CA2475777C (en) 2005-10-04
CA2475778C (en) 2005-10-04
CA2318677C (en) 2002-04-16

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