EP1864510A1 - Procede et dispositif d'evaluation d'une qualite d'un signal representatif d'au moins un stimulus, telle que perçue par un destinataire dudit stimulus - Google Patents
Procede et dispositif d'evaluation d'une qualite d'un signal representatif d'au moins un stimulus, telle que perçue par un destinataire dudit stimulusInfo
- Publication number
- EP1864510A1 EP1864510A1 EP06726026A EP06726026A EP1864510A1 EP 1864510 A1 EP1864510 A1 EP 1864510A1 EP 06726026 A EP06726026 A EP 06726026A EP 06726026 A EP06726026 A EP 06726026A EP 1864510 A1 EP1864510 A1 EP 1864510A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- quality
- stimulus
- recipient
- product
- representative
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/004—Diagnosis, testing or measuring for television systems or their details for digital television systems
Definitions
- the present invention relates to a method for evaluating a quantity representative of a quality, as perceived by a recipient, of a signal carrying data representative of at least one stimulus intended to be produced to said recipient, which method includes a quantization step of a first parameter and a second parameter respectively representative of a spatial quality and a temporal quality of said signal.
- Targeted broadcast systems the use of which is possible in the current state of the art, generally involve converting an analog signal representative of the stimuli to be transmitted into a digital data signal, which conversion is usually followed by a encoding said data to reduce the volume as much as possible without causing them significant degradation, the encoded data being intended to be transmitted in packets according to standardized transmission protocols such IPv4 Internet protocols or IPv6.
- An individual who, for example, has subscribed to an audiovisual program supply service will be contractually entitled to expect a minimum level of quality of the images and sounds transmitted to him, so that a provider of this service of supply must ensure that such requirements are met, which can only be accomplished by making a relevant assessment of the quality of the stimuli which will be returned to the recipient after transmission, the said evaluation to be carried out taking into account human peculiarities of the perception of this recipient.
- the object of the invention is in particular to remedy the drawbacks described above, by proposing a quality evaluation method of a stimulus which makes it possible to take account of a correlation made by a person exposed to said stimulus between his or her spatial and temporal as perceived by this person, said method can further be implemented automatically and in real time during the transmission and / or reception of a signal carrying data representative of said stimulus.
- the invention relates to an evaluation method according to the introductory paragraph which includes a step of calculating a product of said first and second parameters and is characterized in that it also includes a a weighting step in which a weighted product is calculated by raising the product of the first and second parameters to a power of less than one.
- the inventors have indeed carried out validation experiments which have demonstrated that the choice of such a formulation by weighted product of the measurement quantity to correlate the spatial and temporal qualities Sqm and Tqm offers results which are much closer to the average perception of a statistically significant population as the results obtained by the choice of a single product between said spatial and temporal qualities.
- the calculation of the weighted product can be done purely automatically and in real time on the basis of values of the first and second parameters which can also be produced without human intervention according to techniques already known to those skilled in the art.
- the measurement quantity used in the process according to the invention is therefore particularly well suited to quality control applications in the targeted information dissemination systems described in the introductory part.
- a weak quality improvement to a strongly degraded stimulus is only weakly perceived by a human receptor of said stimulus,. a slight improvement in quality provided to a substantially degraded stimulus is strongly perceived by a human receptor of said stimulus,
- the sigmoid function will be of the form:
- the invention is also remarkable in that it makes it possible to quantify a measurement quantity in real time by automatic analysis of the signal whose quality is measured, and is therefore particularly well suited to control applications. of quality in the targeted information dissemination systems described in the introductory part.
- the invention therefore also relates to a method of transmitting data representative of at least one stimulus intended to be produced to a recipient, a method including:
- the weighting means will include variation limitation means for calculating a value of a sigmoid function of the interaction variable.
- the invention also relates to a system for transmitting data representative of at least one stimulus intended to be produced to a recipient, a system including:
- a device for evaluating a quantity of encoded signal quality measurement which device complies with the foregoing description.
- the encoding means being intended to apply to the data a processing defined by at least one configuration parameter
- the system will further include means for adjusting said configuration parameter as a function of minus a value of the measurement quantity produced by the evaluation means.
- Such a variant makes it possible to carry out a quality control loop by slaving the operating conditions of the data encoding means to the level of quality perceived by the recipient of these data.
- the evaluation method can be implemented in various ways, in particular in hard-wired form or in software form.
- the invention therefore also relates to a computer program product downloadable via a telecommunication network and / or stored in a memory of a central unit and / or stored on a memory medium intended to cooperate with a reader of said central unit and intended to to allow an evaluation of a magnitude representative of a quality, as perceived by a recipient, of a signal carrying data representative of at least one stimulus to be produced to said recipient,
- program includes at least one instruction defining a calculation of a first parameter and a second parameter respectively representative of a spatial quality and a temporal quality of said signal, and at least one instruction defining a calculation of a product of said first and second parameters
- product program computer characterized in that it includes at least one instruction defining a calculation of a product weighted by ele the product of the first and second parameters to a power of less than one.
- Such a program may furthermore include instructions defining a procedure for calculating an interaction variable defined by a linear equation of the weighted product, and possibly a procedure for limiting the variation of this interaction variable during which a value of a limiting function of the interaction variable is calculated, said limiting function being monotonic and bounded between a minimum value and a maximum value of perceived quality and which may in particular take the following form:
- the invention also relates to a data carrier on which is stored a software according to the above description.
- FIG. 1 is a block diagram which represents a data transmission system in which the invention is used.
- FIG. 2 is a block diagram which represents evaluation means that can be implemented in such a system.
- FIG. 3 is a transfer curve which illustrates a preferred mode of correlation of parameters representative of a spatial quality and a temporal quality of signals transmitted in such a system.
- FIG. 4 is a block diagram which represents a system in which a first variant of the invention is used,
- Fig. 5 is a block diagram showing a data transmission system in which a second variant of the invention is used.
- Fig.6 is a block diagram illustrating a possible application of the invention to the evaluation of the quality of audiovisual programs.
- FIG. 1 schematically represents an SYST system for data transmission which includes means for generating SRC of an IFx data flow.
- each of the first and second quantization modules SM and TM are intended to receive the OFx output data stream, a data channel represented in dashed lines that may optionally be provided for routing the IFx input data stream to the quantization modules SM and TM which can then be used as a comparison reference, thus allowing, for example, a correlation between the input and output flows IFx and OFx which will make it possible to quantify degradations stigmatized by a lack of correspondence between said flows.
- the encoding means are intended to be configured by means of at least one configuration parameter Ep, for example a compression ratio or a transmission rate, the value of which, determined by an EPGM encoding parameter generator, will define the conditions under which the encoding of the data will be performed.
- the SYST1 system represented here also includes a TDEC transmission decoder identical to a reception decoder, not shown here, which is provided with the receiving part RECE for the decoding of the output stream OFx.
- the SYST1 system finally includes a QMM evaluation device of a measurement quantity representative of the quality of the encoded data stream EFx, which QMM device is in accordance with the foregoing description and is intended to produce a measurement signal PQ.
- This first variant of the invention makes it possible to perform an evaluation of the quality of the encoded signal, by providing the encoded data stream EFx to the transmission decoder which will produce a decoded data stream DFx representative of the data stream that will actually be used by the receiving part RECE to produce the user of the system SYSTl the stimulus which is intended for him.
- FIG. 5 diagrammatically represents a data transmission system SYST2 according to a second variant of the invention, which system SYST2 is intended to transmit, between a transmitting part TRME and a reception part RECE, a data stream representative of less a stimulus.
- This system SYST2 comprises elements common with that described above, said common elements then bearing the same reference signs.
- the SYST2 system shown here includes an RDEC receiver decoder which is provided with the receiver part RECE for the decoding of the output stream OFx.
- each correlation may further include a step of calculating an interaction variable defined by a linear equation of a weighted product (Vsq, VTQ) and cl (Asq, Atq) C2 corresponding, and optionally, a step of limiting the variation of said interaction variable by implementing a sigmoid function of said interaction variable.
- the quality evaluation module QMD finally comprises an AVCB mixer capable of receiving the values of the quality measurement variables PQV and PQA of the first and second VFx and AFx streams of video data and audio data, and to combine these values according to a technique known to those skilled in the art to provide a signal GPQ representative of an overall assessment of the quality of the AVFx data stream as perceived by a spectator of the audiovisual program defined by these data.
- This GQP signal can thus be expressed in the form:
- GPQ ⁇ .PQV + ⁇ .PQA + ⁇ . (PQV.PQA) + ⁇ , where ⁇ , ⁇ , ⁇ and ⁇ are real numbers obtained once and for all by statistical analysis of the perceptions of a group of people exposed in laboratory to variations in audio and video quality of an audiovisual stimulus carried by an AVFx data stream.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0503051 | 2005-03-29 | ||
PCT/FR2006/000494 WO2006103323A1 (fr) | 2005-03-29 | 2006-03-06 | Procédé et dispositif d'évaluation d'une qualité d'un signal représentatif d'au moins un stimulus, telle que perçue par un destinataire dudit stimulus |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1864510A1 true EP1864510A1 (fr) | 2007-12-12 |
Family
ID=35295363
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06726026A Withdrawn EP1864510A1 (fr) | 2005-03-29 | 2006-03-06 | Procede et dispositif d'evaluation d'une qualite d'un signal representatif d'au moins un stimulus, telle que perçue par un destinataire dudit stimulus |
Country Status (4)
Country | Link |
---|---|
US (1) | US7908120B2 (fr) |
EP (1) | EP1864510A1 (fr) |
JP (1) | JP4960953B2 (fr) |
WO (1) | WO2006103323A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2007313050B2 (en) * | 2006-08-29 | 2012-05-31 | Liao, Hsiu-Chen | A foam spring mattress configured with variable firmness |
EP1973329B1 (fr) * | 2007-03-19 | 2017-02-15 | Ricoh Company, Ltd. | Appareil et procédé de traitement d'images |
JP5195177B2 (ja) * | 2008-09-01 | 2013-05-08 | 富士通株式会社 | 信号伝送システム評価装置、信号伝送システム評価方法、信号伝送システム評価プログラム |
US8525883B2 (en) * | 2011-09-02 | 2013-09-03 | Sharp Laboratories Of America, Inc. | Methods, systems and apparatus for automatic video quality assessment |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5446492A (en) * | 1993-01-19 | 1995-08-29 | Wolf; Stephen | Perception-based video quality measurement system |
US6011868A (en) * | 1997-04-04 | 2000-01-04 | Hewlett-Packard Company | Bitstream quality analyzer |
US6340994B1 (en) * | 1998-08-12 | 2002-01-22 | Pixonics, Llc | System and method for using temporal gamma and reverse super-resolution to process images for use in digital display systems |
US6496221B1 (en) | 1998-11-02 | 2002-12-17 | The United States Of America As Represented By The Secretary Of Commerce | In-service video quality measurement system utilizing an arbitrary bandwidth ancillary data channel |
CA2371998C (fr) * | 1999-02-11 | 2006-01-24 | British Telecommunications Public Limited Company | Analyse de la qualite d'un signal video |
US6285797B1 (en) * | 1999-04-13 | 2001-09-04 | Sarnoff Corporation | Method and apparatus for estimating digital video quality without using a reference video |
US6671324B2 (en) * | 2001-04-16 | 2003-12-30 | Mitsubishi Electric Research Laboratories, Inc. | Estimating total average distortion in a video with variable frameskip |
GB0228556D0 (en) | 2002-12-06 | 2003-01-15 | British Telecomm | Video quality measurement |
-
2006
- 2006-03-06 US US11/910,152 patent/US7908120B2/en not_active Expired - Fee Related
- 2006-03-06 JP JP2008503543A patent/JP4960953B2/ja not_active Expired - Fee Related
- 2006-03-06 EP EP06726026A patent/EP1864510A1/fr not_active Withdrawn
- 2006-03-06 WO PCT/FR2006/000494 patent/WO2006103323A1/fr active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2006103323A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2006103323A1 (fr) | 2006-10-05 |
US20080288211A1 (en) | 2008-11-20 |
JP4960953B2 (ja) | 2012-06-27 |
JP2008535349A (ja) | 2008-08-28 |
US7908120B2 (en) | 2011-03-15 |
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