WO2007086590A3 - Transcoding apparatus, transcoding method and integrated circuit - Google Patents

Transcoding apparatus, transcoding method and integrated circuit Download PDF

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Publication number
WO2007086590A3
WO2007086590A3 PCT/JP2007/051533 JP2007051533W WO2007086590A3 WO 2007086590 A3 WO2007086590 A3 WO 2007086590A3 JP 2007051533 W JP2007051533 W JP 2007051533W WO 2007086590 A3 WO2007086590 A3 WO 2007086590A3
Authority
WO
WIPO (PCT)
Prior art keywords
quantization parameter
transcoding
bit
candidate
unit
Prior art date
Application number
PCT/JP2007/051533
Other languages
French (fr)
Other versions
WO2007086590A2 (en
Inventor
Wei-Fu Chen
Hon-Wen Pon
Ju-Yun Cheng
Original Assignee
Matsushita Electric Ind Co Ltd
Wei-Fu Chen
Hon-Wen Pon
Ju-Yun Cheng
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 Matsushita Electric Ind Co Ltd, Wei-Fu Chen, Hon-Wen Pon, Ju-Yun Cheng filed Critical Matsushita Electric Ind Co Ltd
Publication of WO2007086590A2 publication Critical patent/WO2007086590A2/en
Publication of WO2007086590A3 publication Critical patent/WO2007086590A3/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/40—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using video transcoding, i.e. partial or full decoding of a coded input stream followed by re-encoding of the decoded output stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/124—Quantisation
    • H04N19/126—Details of normalisation or weighting functions, e.g. normalisation matrices or variable uniform quantisers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/146—Data rate or code amount at the encoder output
    • H04N19/149—Data rate or code amount at the encoder output by estimating the code amount by means of a model, e.g. mathematical model or statistical model
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/146—Data rate or code amount at the encoder output
    • H04N19/152—Data rate or code amount at the encoder output by measuring the fullness of the transmission buffer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/48—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using compressed domain processing techniques other than decoding, e.g. modification of transform coefficients, variable length coding [VLC] data or run-length data

Abstract

A transcoding apparatus includes: a decoding unit for decoding a first bit stream; a bit allocation unit for estimating a bit count that can be used during encoding; a quantization parameter calculating unit for calculating a candidate quantization parameter according to the estimated bit count; a quantization parameter adjuster for determining a second quantization parameter according to the value of the candidate quantization parameter and for determining a ratio of the second quantization parameter to a first quantization parameter; and a bit shifting unit for performing bit shifting of decoded data according to the ratio. The quantization parameter adjuster sets a first critical value, the size of which is equal to twice the first quantization parameter. When the candidate quantization parameter is not smaller than the first threshold value, the second quantization parameter is set to be the same as the first critical value. When the candidate quantization parameter is smaller than the first threshold value, the second quantization parameter is set to be the same as the first quantization parameter.
PCT/JP2007/051533 2006-01-25 2007-01-24 Transcoding apparatus, transcoding method and integrated circuit WO2007086590A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN 200610004506 CN101009829A (en) 2006-01-25 2006-01-25 Bit rate conversion coding method, conversion encoder, and integrated circuit for error accumulation
CN200610004506.5 2006-01-25

Publications (2)

Publication Number Publication Date
WO2007086590A2 WO2007086590A2 (en) 2007-08-02
WO2007086590A3 true WO2007086590A3 (en) 2007-11-29

Family

ID=38309611

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2007/051533 WO2007086590A2 (en) 2006-01-25 2007-01-24 Transcoding apparatus, transcoding method and integrated circuit

Country Status (2)

Country Link
CN (1) CN101009829A (en)
WO (1) WO2007086590A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109660825B (en) * 2017-10-10 2021-02-09 腾讯科技（深圳）有限公司 Video transcoding method and device, computer equipment and storage medium

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0627858A2 (en) * 1993-06-01 1994-12-07 Matsushita Electric Industrial Co., Ltd. Apparatus for further compressing and recording encoded digital video data streams
US6208688B1 (en) * 1998-05-29 2001-03-27 Korea Telecom Method of selecting a requantization step size and controlling a bit-rate
US6590936B1 (en) * 1999-04-13 2003-07-08 Matsushita Electric Industrial Co., Ltd. Coded data transform method, transcoding method, transcoding system, and data storage media
WO2004088968A2 (en) * 2003-03-26 2004-10-14 Scientific-Atlanta, Inc. A digital stream transcoder with a hybrid-rate controller

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0627858A2 (en) * 1993-06-01 1994-12-07 Matsushita Electric Industrial Co., Ltd. Apparatus for further compressing and recording encoded digital video data streams
US6208688B1 (en) * 1998-05-29 2001-03-27 Korea Telecom Method of selecting a requantization step size and controlling a bit-rate
US6590936B1 (en) * 1999-04-13 2003-07-08 Matsushita Electric Industrial Co., Ltd. Coded data transform method, transcoding method, transcoding system, and data storage media
WO2004088968A2 (en) * 2003-03-26 2004-10-14 Scientific-Atlanta, Inc. A digital stream transcoder with a hybrid-rate controller

Also Published As

Publication number Publication date
WO2007086590A2 (en) 2007-08-02
CN101009829A (en) 2007-08-01

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