WO2006056531A1 - Verfahren zur transcodierung sowie transcodiervorrichtung - Google Patents
Verfahren zur transcodierung sowie transcodiervorrichtung Download PDFInfo
- Publication number
- WO2006056531A1 WO2006056531A1 PCT/EP2005/055846 EP2005055846W WO2006056531A1 WO 2006056531 A1 WO2006056531 A1 WO 2006056531A1 EP 2005055846 W EP2005055846 W EP 2005055846W WO 2006056531 A1 WO2006056531 A1 WO 2006056531A1
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- WO
- WIPO (PCT)
- Prior art keywords
- transform coefficient
- information
- signal
- digital video
- page information
- Prior art date
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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
- H04N19/30—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability
- H04N19/36—Scalability techniques involving formatting the layers as a function of picture distortion after decoding, e.g. signal-to-noise [SNR] scalability
-
- 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
- H04N19/30—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability
-
- 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
- H04N19/70—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by syntax aspects related to video coding, e.g. related to compression standards
Definitions
- the invention relates to a method according to the preamble of claim 1 and to a transcoding device according to the term of claim 8.
- video signals are provided in several quality levels. Examples are: - Digital TV in several quality levels for receivers (home TV sets, PCs, organizers, multimedia-capable mobile radio terminals),
- the object on which the invention is based is to provide a method for transcoding and a transcoding device which permits a transcoding of a coded, digital video input signal with a base signal and at least one differential extension signal in a simple and efficient manner.
- the base signal becomes a first page information and a first transform coefficient information and at least one differential extension signal a second page information and in each case a second transform coefficient information is determined, a third side information is generated from the first and at least one second side information, from the first and at least one second transform coefficient. zienteninformation generated by weighted addition a third transform coefficient information, wherein the first, second and third transform coefficient information based on an identical transform coefficient coding method, and generates an encoded, digital video output signal from the third page information and the third transform coefficient information.
- the method according to the invention makes it possible to generate a coded, digital video output signal from a coded, digital video input signal which consists of a base signal and at least one differential extension signal. Furthermore, by dividing the base signal and the differential extension signals into the respective transform coefficient information and page information, it is achieved that the coded, digital video output signal can be generated in a simple manner.
- the encoded digital video input signal is decoded by an entropy decoder before transcoding and the encoded digital video output signal is encoded by an entropy encoder, a data volume for the encoded digital video input signal and the encoded digital video output signal can be considerably reduced.
- the third page information and the third transform coefficient information of the encoded digital video output signal are selected according to a first video encoder.
- Standard encoded and the first and second Soinforma ⁇ tions and the first and second transform coefficient information based on a second video coding standard.
- the use of the first or second video coding standard ensures that individual syntax elements of the different page information can be coded in a simple and cost-effective manner with already available modules of the first or second video coding standard.
- a method according to a standard in particular H.261, H.263, H.264, MPEG1, MPEG2 or MPEG4, is used as the first and / or second video coding standard, so that existing modules of a first or second video coding standard are used.
- second video coding standards can be reused for transcoding.
- a first part of syntax elements of the respective third page information of the respective second page information is taken, and a second part of syntax elements of the respective third page information is generated from a combination of the first and the respective second page information.
- the coded, digital video output signal is generated in such a way that it is formed by the base signal and by the optional inclusion of at least one differential expansion signal and a predeterminable data rate is not exceeded.
- the invention further relates to a transcoding device for transcoding a coded, digital video input signal having a base signal and at least one differential expansion signal with a decoding unit for determining a first page information and a first transform coefficient information from the base signal and a second page information and a second transform coefficient information from at least one differential extension signal, with a page coding unit for generating a third page information from the first and at least one second side information, with a transform coefficient coding unit for generating a third transform coefficient information by weighted addition from the first and at least one second transform coefficient information, the first, second and third transform coefficient information being based on an identical transform coefficient coder drive, and with an encoder unit for generating a coded digital video output signal from the third page information and the third transform coefficient information.
- a transcoding device for transcoding a coded, digital video input signal having a base signal and at least one differential expansion signal with a decoding unit for determining a first page information and a first transform coefficient information from the base signal and a second page information and
- the transcoding device is additionally equipped with an entropy decoder for decoding the encoded digital video input signal before transcoding and with an entropy encoder for encoding the encoded digital video output signal, then those encoded for the encoded, digital encoded input signal digital video input signal and the coded, digital Vi ⁇ deoausgangssignal required data volumes reduced.
- the transcoding device is integrated in a terminal and / or in a network element
- the method according to the invention can be used both in a terminal, such as e.g. a digital computer, as well as in a network element, e.g. an application server in a GPRS network (GPRS - General Packet Radio System).
- a terminal such as e.g. a digital computer
- a network element e.g. an application server in a GPRS network (GPRS - General Packet Radio System).
- GPRS network GPRS - General Packet Radio System
- FIG. 1 shows a transcoding device for carrying out the method according to the invention
- FIGs 2a and 2b show two embodiments, each one
- FIG. 3 shows a signal flow diagram for linking the various transform coefficient information to generate third transform coefficient information taking account of page information parameters
- FIGS. 1 to 4 show an exemplary embodiment of a transcoding device TV, which is used to carry out the method according to the invention.
- the coded digital video input signal VS to be transcoded comprises a base signal BS and at least one differential extension signal ES1, ES2.
- the base signal BS which is a coded, digital video signal, can be decoded independently of a differential extension signal ES1, ES2.
- the base signal BS corresponds for example to the lowest quality level of a video sequence, ie a basic quality.
- the base signal BS includes first side information SB, first transform coefficient information TB.
- Each of the differential extension signals ES1, ES2 encompasses in each case a second side information SE1, SE2 and in each case a second transform coefficient information TE1, TE2.
- the differential expansion signals ES1, ES2 contain incremental image information which, together with the base signal BS, increases the image quality of the video sequence.
- a differential extension signal such as the second differential extension signal ES2
- both the base signal BS and the lower differential extension signals, such as the first differential extension signal ES1 must be decoded.
- a first additional quality level is achieved
- the aid of the first and second differential extension signals ES1, ES2 a second, improved quality level is achieved compared to the base quality.
- the second transform coefficient information TE1 of the first differential extension signal ES1 comprises only a difference information which is formed from the subtraction of the respective transform coefficients of the first quality level and the respective transform coefficients of the base quality level.
- the second transform coefficient information TE2 is obtained by subtracting the respective transform coefficients of the quality level belonging to the second transform coefficient information TE2 and the comparison lower quality levels. It is also possible to carry out a weighting of the transform coefficients to be subtracted. Details are known from documents [1 - 3].
- the base signal BS and the two differential extension signals ES1, ES2 are first processed by an entropy decoder PD.
- An entropy encoding or decoding discloses a Hufmann coding scheme in which generally codewords which frequently occur are each assigned a short output codeword and codewords which occur less frequently each have a longer output codeword.
- the base signal BS and each of the differential extension signals ES1, ES2 are decoded with the aid of the entropy decoder PD.
- the base signal BS and the two differential extension signals ES1, ES2 or the corresponding signals are forwarded to a decoding unit DE after the alternative entropy decoding.
- the decoding unit DE has the function of determining the first and second page information SB, SEI, SE2 and the first and second transform coefficient information TB, TE1, TE2 of the base signal BS and the differential extension signals ES1, ES2.
- the second page information SE2 and the second transform coefficient information TE2 are reproduced for the second differential extension signal ES2.
- At least one third page information SN1, SN2 is formed with the aid of the first page information SB of the base signal BS and the respective second page information SE1, SE2 of at least one of the differential extension signals ES1, ES2 using a page coding unit SIC.
- An expedient embodiment for generating at least one third page information on SN1, SN2 will be explained in more detail below with reference to FIG.
- the third page information SN1 is generated from the first page information SB and the second page information SEI of the first differential extension signal ES1.
- FIG. 4 shows in the upper part first and second transform coefficient information TB, TE1, TE2 and first and second side information SB, SE1, SE2.
- the first side information SB contains a plurality of syntax elements, such as eg.
- the second side information SEI of the first differential extension signal ES1 comprises, for example, the syntax elements SY1, SY3, SY4, SY5, SY2 *.
- the syntax elements SY1, SY3, SY4, SY5 of the first part T1 describe, for example, the following functions:
- the first syntax element SY1 comprises a first quantization parameter.
- the third syntax element SY3 describes in the form of a header field (general header) general information, such as an image size of the encoded digital video input signal VS.
- the fourth syntax element SY4 includes motion estimation information such as the motion vectors.
- the fifth syntax element SY5 describes additional information which is identical for the base signal BS and all the differential extension signals ES1, ES2, such as e.g. a prediction mode of motion estimation.
- the third page information SN1 comprises at least one further syntax element SY2, which is generated from a combination of the first page information SB and the second page information SEI.
- This type of syntax elements SY2 can be combined in a second part T2.
- the second syntax element SY2 is formed from the seventh syntax element SY7 and the modified second syntax element SY2 *.
- the seventh and second modified syntax elements SY7, SY2 * can each correspond to a specific block pattern indicator and, for example, assume the following values:
- the macroblock belonging to the block pattern indicator SY2 will have an encoding for both the 8x8 block at the top left and the 8x8 block at the bottom right, whereas the other two 8x8 blocks will be uncoded.
- one or more syntax elements such as e.g., the third syntax element SY3 (main header) can be used both in the first side information SB of the base signal BS and in the respective second side information SE1, SE2 of the differential extension signal ES1, ES2.
- the third, fourth and fifth syntax elements SY3, SY4, SY5 are identical both in the base signal BS and in the differential extension signals ES1, ES2.
- the respective second page information SE1, SE2 may only include those syntax elements which are not identical to one of the syntax elements of the first page information SB of the base signal BS.
- the method according to the invention can also be used if, for example, the second side information SEI comprises only the first and the modified second syntax elements SY1, SY2 *.
- the procedure for the creation of the further third page information SN2 is corresponding to the explanations for the creation of the third page information SN1, whereby, however, the other second page information SE2 must now be taken into account instead of the one second page information SEI.
- the syntax elements of the first and second page information SB, SEI, SE2 can be encoded according to a first video coding standard VCS1 and the syntax elements of the third page information SN1, SN2 encoded according to a second video coding standard VCS2.
- the syntax elements can be coded according to at least one of the standards H.261, H.263, H.264, MPEG-I Visual, MPEG-2 Visual / H262 or MPEG-4 Visual.
- a simple realization in practice for generating the third page information SN1, SN2 results if the first and second video decoding standards VCS1, VCS2 are identical.
- the respective third page information SN1, SN2 may be formed merely by copying individual syntax elements of the first and second page information SB, SE1, SE2. If, however, the first and second video coding standard VCS1, VCS2 differ, one or more syntax elements of the first and second page information SB, SEI, SE2 may have to be generated by the first video coding standard in order to generate the syntax elements of the respective third page information SN1, SN2 VCSl be converted into the second video coding standard VCS2.
- a third transform coefficient information TN1, TN2 is formed by means of a transform coefficient coding unit TE.
- This transform coefficient coding unit TE generates the third transform coefficient information TN1, TN2 according to a method known from [1, 2].
- the third transform coefficient information TN1, TN2 is generated by means of a weighted addition.
- the method known from [2] is carried out.
- the new transform coefficient information TN is derived from a linear combination of the first transform coefficient information TB of the base signal BS and the second transcoding information TN.
- shape coefficient information TE1 of the first differential extension signal ES1 is formed in a coefficient-wise manner. This can be expressed by the following equation:
- TNX TB a ⁇ + TE ⁇
- a first weighting coefficient ⁇ 1 represents a weighting for the first transform coefficient information TB.
- the first weighting parameter ⁇ 1 is obtained from the division of a basic quantization parameter QPO of the base signal BS and a first quantization parameter QP1 of the first differential extension signal ES1. This can be expressed by the following equation:
- the basic quantization parameter QPO of the base signal BS corresponds to the sixth syntax element SY6 and the first quantization parameter QP1 of the first differential extension signal ES1 corresponds to the first syntax element SY1.
- next third transform coefficient information TN2 is described by the following equation:
- TN2 TE2 + a2 (TEI + al • TB)
- a second weighting parameter 0C2 is determined by dividing a second quantization parameter QP2 of the second differential extension signal ES2 and of the first quantization parameter QP1 of the first differential extension signal ES1.
- the first and second weighting parameters ⁇ 1, ⁇ 2 are determined by means of a page information Parameters SIP, which is generated for example by the side encoding SEC, transmitted to the transform coefficient coding unit TE.
- the third transform coefficient information TN1, TN2 with the respective third page information SN1, SN2 is transmitted by the transform coefficient coding unit TE and the page coding unit SIC to an encoding unit EE for generating the encoded digital video output signal AS1, AS2.
- an encoding unit EE for generating the encoded digital video output signal AS1, AS2.
- two encoded digital video output signals AS1, AS2 are depicted.
- Each of these coded, digital video output signals AS1 or AS2 comprises the third page information SN1 or SN2 and the third transform coefficient information TN1 or TN2.
- the encoding unit EE generates the coded, digital video output signals AS1, AS2 in such a way that they can be decoded with the aid of a video coding standard, such as, for example, a first or second video coding standard VCS1 or VCS2 ,
- the encoded digital video output signals AS1, AS2 are encoded with the aid of an entropy encoder PE.
- the entropy encoder PE applies, for example, a Hufmann coding method.
- the transcoding device TV After the transcoding of the coded, digital video input signal VS with a base signal BS and at least one differential extension signal ES1, ES2 by the transcoding device TV, at least one coded, digital video output signal AS1, AS2 is available at the output of the transcoding device TV , Thus, at least one of the encoded digital video output signals AS1, AS2, as well as the base signal BS can be made available to a user.
- the base signal BS comprises a low picture quality, the encoded digital video output signal AS1 improved Image quality and the highest coded digital video output signal AS2 the highest image quality.
- the selection as to whether one of the coded, digital video output signals AS1, AS2 or the base signal BS, which is also a coded, digital video signal, is output by the transcoding device TV, is controlled in such a way that due to a predefinable Data rate C that video signal or video output signal BS, ASl, AS2 is output, wel ⁇ ches the predetermined data rate C does not exceed and thereby provides the best image quality.
- a predefinable Data rate C that video signal or video output signal BS, ASl, AS2 is output, wel ⁇ ches the predetermined data rate C does not exceed and thereby provides the best image quality.
- Base signal BS
- Image quality low Data rate: 64 kbit / s
- the base signal BS does not exceed the specifiable data rate C, it does produce a poorer picture quality than the encoded digital video output signal VS1.
- the transcoding device TV can be integrated in a terminal EG, such as a mobile radio communication device, for example according to GSM standard or UMTS standard, as well as in a computer unit which is connected to a public Internet and / or intranet.
- a terminal EG such as a mobile radio communication device, for example according to GSM standard or UMTS standard
- the transcoding device TV is used, for example, to provide a coded, digital video output signal AS1, AS2 with a predefinable data rate C from a coded, digital video input signal VS with a base signal BS and at least one differential enhancement signal ES1, ES2 , This is decoded by a downstream video decoder and displayed by means of a display in the terminal EG.
- the transcoding device TV a coded digital video input signal VS, which consists of several sub-signals and which is coded for example according to a video coding standard, and which is not decodable for the Video ⁇ decoder of the terminal EG, transcoding such that a decoding in the terminal EG is made possible.
- the transcoding device TV is integrated in a network element NW.
- the network element NW for example, has the task, dependent on an available transmission bandwidth, of generating a coded, digital video output signal AS1, AS2 in such a way that it can be transmitted in the network system N taking into account the available data rate of a transmission path. If the available data rate of the transmission path changes, the transcoding device TV adapts the data rate of the encoded digital video output signal AS1, AS2 accordingly by adding or removing one or more differential extension signals ES1, ES2.
- the network element NW is integrated in a packet-oriented network system N according to the GSM standard, UMTS standard or SIP standard.
- the network element NW is also part of a network system according to ISDN or ATM standard, which, for example, further network units NKL, NK2 includes.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/791,351 US8270470B2 (en) | 2004-11-23 | 2005-11-09 | Transcoding method and device |
EP05815632A EP1815690A1 (de) | 2004-11-23 | 2005-11-09 | Verfahren zur transcodierung sowie transcodiervorrichtung |
JP2007541921A JP4723593B2 (ja) | 2004-11-23 | 2005-11-09 | トランスコーディングする方法並びにトランスコーダ装置 |
CN200580040046.5A CN101073264B (zh) | 2004-11-23 | 2005-11-09 | 代码转换的方法以及代码转换装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102004056446A DE102004056446A1 (de) | 2004-11-23 | 2004-11-23 | Verfahren zur Transcodierung sowie Transcodiervorrichtung |
DE102004056446.9 | 2004-11-23 |
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WO2006056531A1 true WO2006056531A1 (de) | 2006-06-01 |
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PCT/EP2005/055846 WO2006056531A1 (de) | 2004-11-23 | 2005-11-09 | Verfahren zur transcodierung sowie transcodiervorrichtung |
Country Status (6)
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US (1) | US8270470B2 (de) |
EP (1) | EP1815690A1 (de) |
JP (1) | JP4723593B2 (de) |
CN (1) | CN101073264B (de) |
DE (1) | DE102004056446A1 (de) |
WO (1) | WO2006056531A1 (de) |
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US7912299B2 (en) * | 2004-10-08 | 2011-03-22 | Microsoft Corporation | System and method for efficiently encoding data |
US20060235941A1 (en) * | 2005-03-29 | 2006-10-19 | Microsoft Corporation | System and method for transferring web page data |
US9197903B2 (en) * | 2007-10-17 | 2015-11-24 | Stmicroelectronics S.R.L. | Method and system for determining a macroblock partition for data transcoding |
KR20090097013A (ko) * | 2008-03-10 | 2009-09-15 | 삼성전자주식회사 | 영상 부호화장치 및 영상 복호화장치 |
AU2009298559B2 (en) | 2008-10-03 | 2014-08-21 | Qualcomm Incorporated | Video coding using transforms bigger than 4x4 and 8x8 |
US8634456B2 (en) | 2008-10-03 | 2014-01-21 | Qualcomm Incorporated | Video coding with large macroblocks |
US8503527B2 (en) | 2008-10-03 | 2013-08-06 | Qualcomm Incorporated | Video coding with large macroblocks |
US8483285B2 (en) | 2008-10-03 | 2013-07-09 | Qualcomm Incorporated | Video coding using transforms bigger than 4×4 and 8×8 |
US20100158098A1 (en) * | 2008-12-22 | 2010-06-24 | Echostar Technologies L.L.C. | System and method for audio/video content transcoding |
US8755432B2 (en) | 2010-06-30 | 2014-06-17 | Warner Bros. Entertainment Inc. | Method and apparatus for generating 3D audio positioning using dynamically optimized audio 3D space perception cues |
US8917774B2 (en) * | 2010-06-30 | 2014-12-23 | Warner Bros. Entertainment Inc. | Method and apparatus for generating encoded content using dynamically optimized conversion |
US10326978B2 (en) | 2010-06-30 | 2019-06-18 | Warner Bros. Entertainment Inc. | Method and apparatus for generating virtual or augmented reality presentations with 3D audio positioning |
US9591374B2 (en) | 2010-06-30 | 2017-03-07 | Warner Bros. Entertainment Inc. | Method and apparatus for generating encoded content using dynamically optimized conversion for 3D movies |
WO2012035728A1 (ja) * | 2010-09-16 | 2012-03-22 | パナソニック株式会社 | 画像復号装置、画像符号化装置、それらの方法、プログラム、集積回路およびトランスコード装置 |
EP2768145B1 (de) | 2011-01-14 | 2016-03-23 | GE Video Compression, LLC | Schema für Entropiecodierung und -decodierung |
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Also Published As
Publication number | Publication date |
---|---|
US8270470B2 (en) | 2012-09-18 |
CN101073264B (zh) | 2010-04-14 |
US20080025391A1 (en) | 2008-01-31 |
JP4723593B2 (ja) | 2011-07-13 |
EP1815690A1 (de) | 2007-08-08 |
DE102004056446A1 (de) | 2006-06-29 |
JP2008521303A (ja) | 2008-06-19 |
CN101073264A (zh) | 2007-11-14 |
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