EP2842324A1 - Progressive compression/decompression of a digital video stream comprising at least one interleaved image - Google Patents

Progressive compression/decompression of a digital video stream comprising at least one interleaved image

Info

Publication number
EP2842324A1
EP2842324A1 EP13723843.2A EP13723843A EP2842324A1 EP 2842324 A1 EP2842324 A1 EP 2842324A1 EP 13723843 A EP13723843 A EP 13723843A EP 2842324 A1 EP2842324 A1 EP 2842324A1
Authority
EP
European Patent Office
Prior art keywords
phase shift
chrominance
vertical
field
image
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.)
Ceased
Application number
EP13723843.2A
Other languages
German (de)
French (fr)
Inventor
Pierre Larbier
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.)
ASSISTANCE TECHNIQUE ET ETUDE DE MATERIELS ELECTRONIQUES - ATEME
Original Assignee
ASSISTANCE TECHNIQUE ET ETUDE DE MATERIELS ELECTRONIQUES - ATEME
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 ASSISTANCE TECHNIQUE ET ETUDE DE MATERIELS ELECTRONIQUES - ATEME filed Critical ASSISTANCE TECHNIQUE ET ETUDE DE MATERIELS ELECTRONIQUES - ATEME
Publication of EP2842324A1 publication Critical patent/EP2842324A1/en
Ceased legal-status Critical Current

Links

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
    • H04N19/10—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
    • H04N19/186—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 a colour or a chrominance component
    • 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
    • H04N19/117—Filters, e.g. for pre-processing or post-processing
    • 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
    • H04N19/157—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
    • H04N19/16—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter for a given display mode, e.g. for interlaced or progressive display mode
    • 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
    • H04N19/46—Embedding additional information in the video signal during the compression process
    • 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
    • H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
    • H04N7/0117—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving conversion of the spatial resolution of the incoming video signal
    • H04N7/012—Conversion between an interlaced and a progressive signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/642—Multi-standard receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase

Definitions

  • the object of the present invention relates to the field of compression / decompression of images, and more specifically compression / decompression of digital video stream.
  • One of the objectives of the present invention is to allow the compression / decompression of interlaced video sources with an encoder / decoder that can handle only progressive video sources.
  • the object of the present invention finds a particularly advantageous application in the HEVC standard.
  • Progressive scanning (or “progressive scan” in English) is a display mode used by electronic display systems. This display mode is opposed in general to interlaced scanning (or “interlace” in English).
  • Figure lb appended hereto gives an example of a progressive image. This figure gives more precisely the most common position of the chrominance (represented by the "O") and luminance (represented by the "X") components in the case of the 4: 2: 0 format (chrominance components shared between 4 pixels) progressive.
  • a progressive image consists of pixels arranged in lines.
  • each pixel is represented by a luminance component associated with two chrominance components.
  • the principle of progressive scanning is to display the entire image at once, which opposes it to interlaced scanning, in which the odd lines of the image are displayed, followed by even lines.
  • Figure 1b gives an example of an interlaced image; this figure gives more precisely the most current position of the chrominance (represented by the "O") and luminance (represented by the "X") components in the case of the 4: 2: 0 format (chrominance components shared between 4 pixels) interlace.
  • this interlaced image consists of two distinct fields: a first field or top field (also known as the "top field”), and a second field or lower field (also known as “top field”). bottom field ").
  • the first field consists of the even lines (0, 2, 4, 8, etc.), and the lower field consists of the odd lines (1, 3, 5, 7, 9, etc.).
  • video compressors that natively manage interlaced formats include computer means for taking into account the relative position of luminance and chrominance.
  • encoders designed solely for compressing progressive video sources do not include such means.
  • the applicant also observes that there is no technical solution for encoding interlaced images using an encoder to encode progressive images.
  • the fields of the interlaced images are supplied to the compressor which processes them as so many progressive images.
  • the position of chrominance components may be different from one image (or field) to the next, the result is then reduced coding efficiency (higher rate and / or lower quality) and visible coding defects in the chrominance components.
  • the present invention aims to improve the situation described above, by overcoming the various disadvantages mentioned above.
  • Enabling the encoding / decoding of an interlaced image by an encoder / decoder provided for progressive images is one of the objectives of the present invention.
  • the object of the present invention relates to a method of compressing a digital video stream; this digital video stream comprises at least one image constituted by the interleaving of at least a first and a second field each comprising at least one chrominance plane and a luminance plane.
  • Such an image is a so-called interlaced image.
  • the relative position of the chrominance and luminance planes is different between the first and second fields.
  • the compression method according to the present invention comprises a prior step of phase shift.
  • the chrominance plane is phase-shifted horizontally and / or vertically according to a determined horizontal and / or vertical phase shift value.
  • the compression method according to the present invention comprises a step of progressive compression which consists of encoding the successive fields of said at least one image.
  • the method allows the compression of at least one interlaced image with a progressive compression.
  • the digital video stream is in the 4: 2: 0 format.
  • the chrominance planes of the first field are shifted vertically by n quarter of a pixel downwards, and the chrominance planes of the second field are shifted vertically by m quarter pixel upward .
  • n and m are positive integers between 1 and 3.
  • the compression method according to the present invention comprises a step of transmitting a signaling message comprising at least one piece of information relating to the horizontal and / or vertical phase shift value.
  • This message is particularly advantageous for decompression (such decompression is described in the following).
  • the successive fields of said at least one image are encoded according to the HEVC standard.
  • the object of the present invention relates to a first computer program that includes instructions adapted to the execution of the steps of the method as described above, this in particular when said computer program is executed by a computer .
  • Such a computer program can use any programming language, and be in the form of a source code, an object code, or an intermediate code between a source code and an object code, such as in a partially compiled form, or in any other desirable form.
  • the subject of the present invention relates to a first computer-readable recording medium on which is recorded a computer program comprising instructions for performing the steps of the method as described above.
  • the recording medium can be any entity or device capable of storing the program.
  • the medium may comprise storage means, such as a ROM, for example a CD-ROM or a microelectronic circuit-type ROM, or a magnetic recording means, for example a diskette of the type " floppy says "or a hard drive.
  • this recording medium can also be a transmitted medium such as an electrical or optical signal, such a signal can be conveyed via an electrical or optical cable, conventional radio or radio or self-directed laser beam or by other means.
  • the computer program according to the invention can in particular be downloaded to an Internet type network.
  • the recording medium may be an integrated circuit in which the computer program is incorporated, the integrated circuit being adapted to execute or to be used in the execution of the method in question.
  • the subject of the present one also relates to a compression device adapted for the implementation of the steps described above.
  • the compression device comprises computer means for compressing a digital video stream comprising at least one image constituted by the interleaving of at least a first and a second field; according to the present invention, these fields each comprise at least one chrominance plane and a luminance plane, the relative position of the chrominance and luminance planes being different between the first and second fields.
  • the compression device comprises a phase shift means which is configured to phase horizontally and / or vertically the chrominance plane, for each field of said at least one image,
  • This phase shift is made according to a horizontal and / or vertical phase shift value determined in such a way that the relative position of the chrominance and luminance planes is constant.
  • the compression device comprises a progressive compression means which is configured to encode the successive fields of said at least one image.
  • the digital video stream is in the 4: 2: 0 format.
  • the phase shift means is configured in such a way that the chrominance planes of the first field are shifted vertically by n quarter of a pixel downwards, and the chrominance planes of the second field are shifted vertically by m quarter of a pixel towards the top.
  • n and m are positive integers between 1 and 3.
  • the compression device comprises a transmission means which is configured to transmit a signaling message comprising at least one information relating to the horizontal and / or vertical phase shift value.
  • the progressive compression means is configured to encode the successive fields of said at least one image according to the HEVC standard.
  • the object of the present invention also provides a method of decompressing a digital video stream comprising at least one compressed image according to the compression method described above.
  • the decompression method according to the present invention comprises a progressive decompression step of decoding said at least one compressed image.
  • the decompression method according to the present invention further comprises an inverse phase-shift step during which, for each field of said at least one decompressed image, the chrominance plane is phase-shifted horizontally and / or vertically according to a horizontal phase shift value and / or inverse vertical determined.
  • the horizontal and / or vertical phase shift value is a function of the horizontal and / or vertical phase shift value.
  • the digital video stream is in the 4: 2: 0 format.
  • the chrominance planes of the first field are shifted vertically upwards by n quarter of a pixel, and the chrominance planes of the second field are shifted vertically by m quarter of a pixel towards the low.
  • n and m are positive integers between 1 and 3.
  • the decompression method according to the present invention comprises a reception step of receiving a signaling message comprising at least one information relating to the horizontal and / or vertical phase shift value.
  • the decompression method according to the present invention comprises a determination step of determining the horizontal and / or vertical phase shift value as a function of the received horizontal and / or vertical phase shift value.
  • the successive fields of said at least one image are decoded according to the HEVC standard.
  • the object of the present invention relates to a second computer program including instructions adapted to perform the steps of the decompression method as described above, when said computer program is executed by a computer .
  • the object of the present invention relates to a second computer-readable recording medium on which is recorded a computer program comprising instructions for performing the steps of the decompression method as described herein. -above.
  • This second computer program and this second recording medium have the same characteristics as those mentioned previously respectively for the first computer program and the first recording medium.
  • the object of the present invention relates to a device for decompressing a digital video stream comprising at least one compressed image according to the compression method described above.
  • the decompression device comprises a progressive decompression means configured to decode said at least one compressed image.
  • the decompression device further comprises an inverse phase shift means configured to phase horizontally and / or vertically the chrominance plane, for each field of said at least one decompressed image, according to a determined horizontal and / or vertical phase shift value.
  • the horizontal and / or vertical phase shift value is a function of the horizontal and / or vertical phase shift value.
  • the digital video stream is in the 4: 2: 0 format.
  • the inverse phase shift means is configured in such a way that, for each field of the said at least one decompressed image, the chrominance planes of the first field are offset vertically by n quarter of a pixel downwards, and the planes of chrominance of the second field are shifted vertically upward by one quarter of a pixel.
  • n and m are positive integers between 1 and 3.
  • the decompression device comprises receiving means configured to receive a signaling message comprising at least one information relating to the horizontal and / or vertical phase shift value.
  • the decompression device further comprises a determination means configured to determine the horizontal and / or vertical phase shift value as a function of the received horizontal and / or vertical phase shift value.
  • the progressive decompression means is configured in such a way that successive fields of said at least one image are decoded according to the HEVC standard.
  • the object of the present invention by its various functional and structural aspects, makes it possible to compress / decompress an interlaced image with an encoder / decoder adapted to progressive images.
  • FIGS. 1 to 4 illustrate an embodiment of this embodiment devoid of any limiting character and in which:
  • FIGS. 1a and 1b each schematically represent the most common position of the chrominance and luminance components in the case of the progressive 4: 2: 0 format and the case of the interlaced 4: 2: 0 format
  • FIG. schematically a compression device according to an exemplary embodiment of the present invention
  • FIG. 3 schematically represents a decompression device according to an exemplary embodiment of the present invention
  • FIG. 4 represents a flowchart illustrating the compression / decompression method according to an advantageous embodiment of the present invention.
  • an interlaced image is an image formed by the interleaving of a first field (or "top field”) and a second field (or “bottom field”) each having two chrominance planes and a luminance plan.
  • the object of the present invention is to allow compression / decompression of such an interlaced image with an encoder / decoder adapted to progressive images.
  • the present invention proposes a computer-based compression device 100 as illustrated in FIG. 2, in which, prior to the compression as such, provision is made for a phase shift means M 1 which is configured to phase out horizontally and vertically. the chrominance plane for each field tf and bf of the image I, this during a prior step of phase shift SI.
  • This phase shift is done according to horizontal phase shift values dh and vertical dv which are determined so that the relative position of the chrominance and luminance planes is constant, as is the case for a progressive image as illustrated in FIG. .
  • the two chrominance planes of the first field tf are vertically offset by a quarter of a pixel downwards, and the chrominance planes of the second field bf are shifted vertically one quarter of a pixel upward.
  • the computing device 100 comprises a progressive compression means M2 configured to encode, during a progressive compression step S2, the successive fields tf and bf of the image I so that to obtain a compressed image ⁇ .
  • this compression is done according to the HEVC standard.
  • the computer device 100 comprises a transmission means M3 making it possible to transmit, with the compressed stream, an ms message message which comprises at least one piece of information relating to the horizontal phase shift values dh. and vertical dv.
  • the present invention provides a computer decompression device 200 which is adapted to decompress the image ⁇ .
  • the computing device 200 comprises a progressive decompression means M4 which is configured to decode the compressed image ⁇ , and obtain an image ⁇ '.
  • This decompression means is initially provided for progressive images. It is understood here that, thanks to the present invention, the computer device 200 can therefore adapt indifferently to the decoding of progressive or interlaced images.
  • this decompression is done according to the HEVC standard.
  • the computer device 200 comprises a reception means M6 configured to receive, during a reception step S6, the ms message message that was previously by the device 100.
  • the computer device 200 further comprises a determination means M7 configured to determine, during a determination step S7, the horizontal phase shift values dhi and vertical dvi inverse according to the information contained in the ms signaling message.
  • the computer device 200 comprises an inverse phase shift means M5 configured to phase shift horizontally and vertically, during an inverse phase shift step S5, the chrominance plane for each field tf and bf of the decompressed image. I ".
  • This inverse phase shift is made according to the horizontal phase shift values dhi and vertical dvi inverse previously determined by the determination means M7.
  • the two chrominance planes of the first field tf are vertically offset by a quarter of a pixel upwards, and the chrominance planes of the second field bf are vertically offset. a quarter of a pixel down.
  • the relative position of the chrominance planes is moved so as to provide the video encoder with a constant and known relative position on all the fields provided; and, after decoding, the chrominance planes are relocated to the original position to reconstruct the I-frame.
  • the ms signaling message which is a message of the type SEI (for "Supplemental Enhancement Information") carried in the compressed stream HEVC.
  • this message of the type SEI is modified by adding the following fields in bold:
  • chroma_s ample _loc_v delta and chroma_s ample _loc_hdelta represent the respectively vertical and horizontal inverse phase shifts to be carried out after the decoding so as to find the relative position of the chrominance planes of the source image I.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Graphics (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

The subject of the present invention pertains to a device (100) for decompressing a digital video stream comprising at least one compressed image (I'), said device comprising: - a means of progressive decompression (M4) configured so as to decode said at least one compressed image (I'), and - a means of inverse phase-shifting (M5) configured so as to horizontally and/or vertically phase shift the chrominance plane, for each field (tf, bf) of said at least one decompressed image (I'), according to a determined horizontal (dhi) and/or vertical (dvi) inverse phase shift value, said horizontal (dhi) and/or vertical (dvi) inverse phase shift value being dependent on the horizontal (dh) and/or vertical (dv) phase shift values.

Description

COMPRESSION/DECOMPRESSION PROGRESSIVE D'UN FLUX NUMERIQUE PROGRESSIVE COMPRESSION / DECOMPRESSION OF DIGITAL STREAM
VIDEO COMPRENANT AU MOINS UNE IMAGE ENTRELACEE VIDEO COMPRISING AT LEAST ONE INTERLACED IMAGE
Domaine technique Technical area
L'objet de la présente invention a trait au domaine de la compression/décompression d'images, et plus précisément la compression/décompression de flux numérique vidéo.  The object of the present invention relates to the field of compression / decompression of images, and more specifically compression / decompression of digital video stream.
Un des objectifs de la présente invention est de permettre la compression/décompression de sources vidéo entrelacées avec un encodeur/décodeur ne sachant gérer que des sources vidéo progressives.  One of the objectives of the present invention is to allow the compression / decompression of interlaced video sources with an encoder / decoder that can handle only progressive video sources.
L'objet de la présente invention trouve une application particulièrement avantageuse dans la norme HEVC.  The object of the present invention finds a particularly advantageous application in the HEVC standard.
Etat de la technique State of the art
Le balayage progressif (ou « progressive scan » en anglais) est un mode d'affichage utilisé par les systèmes d'affichage électroniques. Ce mode d'affichage s'oppose en général au balayage entrelacé (ou « interlace » en anglais).  Progressive scanning (or "progressive scan" in English) is a display mode used by electronic display systems. This display mode is opposed in general to interlaced scanning (or "interlace" in English).
La figure lb annexée à la présente donne un exemple d'une image progressive. Cette figure donne plus précisément la position la plus courante des composantes de chrominance (représentées par les « O ») et de luminance (représentées par les « X ») dans le cas du format 4:2:0 (composantes de chrominance partagées entre 4 pixels) progressif.  Figure lb appended hereto gives an example of a progressive image. This figure gives more precisely the most common position of the chrominance (represented by the "O") and luminance (represented by the "X") components in the case of the 4: 2: 0 format (chrominance components shared between 4 pixels) progressive.
Comme illustré en figure la, une image progressive est constituée de pixels arrangés en lignes.  As illustrated in FIG. 1a, a progressive image consists of pixels arranged in lines.
Dans une telle image, chaque pixel est représenté par une composante de luminance associé à deux composantes de chrominance.  In such an image, each pixel is represented by a luminance component associated with two chrominance components.
Du fait de la faible sensibilité de l'œil humain aux composantes de chrominance, celles-ci peuvent être partagées entre plusieurs pixels ; c'est le cas par exemple dans le format 4:2:0 où les composantes de chrominance sont partagées entre 4 pixels. Le principe du balayage progressif est d'afficher la totalité de l'image en une seule fois, ce qui l'oppose au balayage entrelacé, dans lequel les lignes impaires de l'image sont affichées, suivies ensuite des lignes paires. Due to the low sensitivity of the human eye to chrominance components, they can be shared between several pixels; this is the case for example in the 4: 2: 0 format where the chrominance components are shared between 4 pixels. The principle of progressive scanning is to display the entire image at once, which opposes it to interlaced scanning, in which the odd lines of the image are displayed, followed by even lines.
La figure lb donne un exemple d'une image entrelacée ; cette figure donne plus précisément la position la plus courante des composantes de chrominance (représentées par les « O ») et de luminance (représentées par les « X ») dans le cas du format 4:2:0 (composantes de chrominance partagées entre 4 pixels) entrelacé.  Figure 1b gives an example of an interlaced image; this figure gives more precisely the most current position of the chrominance (represented by the "O") and luminance (represented by the "X") components in the case of the 4: 2: 0 format (chrominance components shared between 4 pixels) interlace.
Comme illustré ici, cette image entrelacée est constituée de deux champs distincts : un premier champ ou champ supérieur (connu également sous l'expression anglaise « top field »), et un deuxième champ ou champ inférieur (connu également sous l'expression anglaise « bottom field »).  As illustrated here, this interlaced image consists of two distinct fields: a first field or top field (also known as the "top field"), and a second field or lower field (also known as "top field"). bottom field ").
Le premier champ est constitué des lignes paires (0, 2, 4, 8, etc.), et le champ inférieur est constitué des lignes impaires (1, 3, 5, 7, 9, etc.).  The first field consists of the even lines (0, 2, 4, 8, etc.), and the lower field consists of the odd lines (1, 3, 5, 7, 9, etc.).
En comparant ces deux figures, on observe que, dans le cas d'une image entrelacée (figure lb), la position relative de la luminance et de la chrominance est différente entre le premier champ et le deuxième champ.  Comparing these two figures, it is observed that, in the case of an interlaced image (FIG. 1b), the relative position of luminance and chrominance is different between the first field and the second field.
De façon contraire, la position relative de la luminance et de la chrominance est constante dans le cas d'une image progressive (figure la).  In contrast, the relative position of luminance and chrominance is constant in the case of a progressive image (Figure la).
Or, les compresseurs vidéo qui gèrent nativement les formats entrelacés comportent des moyens informatiques permettant de tenir compte de la position relative de la luminance et de la chrominance.  However, video compressors that natively manage interlaced formats include computer means for taking into account the relative position of luminance and chrominance.
Néanmoins, les encodeurs conçus uniquement pour compresser des sources vidéo progressives ne comportent pas de tels moyens.  Nevertheless, encoders designed solely for compressing progressive video sources do not include such means.
La demanderesse observe par ailleurs qu'il n'existe aucune solution technique permettant d'encoder des images entrelacées à l'aide d'un encodeur pour encoder les images progressives.  The applicant also observes that there is no technical solution for encoding interlaced images using an encoder to encode progressive images.
A ce jour, il est donc peu recommandé d'utiliser un encodeur progressif avec des sources vidéo entrelacées.  To date, it is therefore not recommended to use a progressive encoder with interlaced video sources.
En effet, en utilisant un tel encodeur, les champs des images entrelacées sont fournis au compresseur qui les traite comme autant d'images progressives. Dans une telle hypothèse, la position des composantes de chrominance pouvant être différente d'une image (ou d'un champ) à la suivante, le résultat est alors une efficacité de codage réduite (débit plus important et/ou une qualité plus faible) et des défauts de codage visibles dans les composantes de chrominance. In fact, by using such an encoder, the fields of the interlaced images are supplied to the compressor which processes them as so many progressive images. In such a case, the position of chrominance components may be different from one image (or field) to the next, the result is then reduced coding efficiency (higher rate and / or lower quality) and visible coding defects in the chrominance components.
Une telle utilisation est donc fortement déconseillée.  Such use is therefore strongly discouraged.
Objet et résumé de la présente invention  Object and summary of the present invention
La présente invention vise à améliorer la situation décrite ci-dessus, en remédiant aux différents inconvénients mentionnés ci-dessus.  The present invention aims to improve the situation described above, by overcoming the various disadvantages mentioned above.
Permette le codage/décodage d'une image entrelacée par un codeur/décodeur prévu pour les images progressives est un des objectifs de la présente invention.  Enabling the encoding / decoding of an interlaced image by an encoder / decoder provided for progressive images is one of the objectives of the present invention.
A cet effet, l'objet de la présente invention porte sur un procédé de compression d'un flux numérique vidéo ; ce flux numérique vidéo comprend au moins une image constituée par l'entrelacement d'au moins un premier et un deuxième champs comportant chacun au moins un plan de chrominance et un plan de luminance.  For this purpose, the object of the present invention relates to a method of compressing a digital video stream; this digital video stream comprises at least one image constituted by the interleaving of at least a first and a second field each comprising at least one chrominance plane and a luminance plane.
Une telle image est une image dite entrelacée.  Such an image is a so-called interlaced image.
Comme observé précédemment, la position relative des plans de chrominance et de luminance est différente entre le premier et le deuxième champs.  As observed previously, the relative position of the chrominance and luminance planes is different between the first and second fields.
Avantageusement, le procédé de compression selon la présente invention comporte une étape préalable de déphasage.  Advantageously, the compression method according to the present invention comprises a prior step of phase shift.
Au cours de cette étape, pour chaque champ de ladite au moins une image, le plan de chrominance est déphasé horizontalement et/ou verticalement selon une valeur de déphasage horizontal et/ou vertical déterminée.  During this step, for each field of said at least one image, the chrominance plane is phase-shifted horizontally and / or vertically according to a determined horizontal and / or vertical phase shift value.
Grâce à un tel déphasage, la position relative des plans de chrominance et de luminance devient constante.  Due to such a phase shift, the relative position of the chrominance and luminance planes becomes constant.
Avantageusement, le procédé de compression selon la présente invention comporte une étape de compression progressive qui consiste à encoder les champs successifs de ladite au moins une image.  Advantageously, the compression method according to the present invention comprises a step of progressive compression which consists of encoding the successive fields of said at least one image.
Grâce à cette succession d'étapes techniques, caractéristique de la présente invention, le procédé permet la compression d'au moins une image entrelacée avec une compression progressive. Dans une variante de réalisation de la présente invention, le flux numérique vidéo est sous le format 4:2:0. Dans cette variante, lors de l'étape de déphasage, les plans de chrominance du premier champ sont décalés verticalement de n quart de pixel vers le bas, et les plans de chrominance du deuxième champ sont décalés verticalement de m quart de pixel vers le haut. Thanks to this succession of technical steps, characteristic of the present invention, the method allows the compression of at least one interlaced image with a progressive compression. In an alternative embodiment of the present invention, the digital video stream is in the 4: 2: 0 format. In this variant, during the phase shift step, the chrominance planes of the first field are shifted vertically by n quarter of a pixel downwards, and the chrominance planes of the second field are shifted vertically by m quarter pixel upward .
Ici, n et m sont des entiers positifs compris entre 1 et 3.  Here, n and m are positive integers between 1 and 3.
Avantageusement, le procédé de compression selon la présente invention comporte une étape d'émission d'un message de signalisation comportant au moins une information relative à la valeur de déphasage horizontal et/ou vertical.  Advantageously, the compression method according to the present invention comprises a step of transmitting a signaling message comprising at least one piece of information relating to the horizontal and / or vertical phase shift value.
Ce message est particulièrement avantageux pour la décompression (une telle décompression est décrite dans ce qui suit).  This message is particularly advantageous for decompression (such decompression is described in the following).
Avantageusement, lors de l'étape de compression, les champs successifs de ladite au moins une image sont encodés selon la norme HEVC.  Advantageously, during the compression step, the successive fields of said at least one image are encoded according to the HEVC standard.
Corrélativement, l'objet de la présente invention porte sur un premier programme d'ordinateur qui comporte des instructions adaptées pour l'exécution des étapes du procédé tel que décrit ci-dessus, ceci notamment lorsque ledit programme d'ordinateur est exécuté par un ordinateur.  Correlatively, the object of the present invention relates to a first computer program that includes instructions adapted to the execution of the steps of the method as described above, this in particular when said computer program is executed by a computer .
Un tel programme d'ordinateur peut utiliser n'importe quel langage de programmation, et être sous la forme d'un code source, d'un code objet, ou d'un code intermédiaire entre un code source et un code objet, tel que dans une forme partiellement compilée, ou dans n'importe quelle autre forme souhaitable.  Such a computer program can use any programming language, and be in the form of a source code, an object code, or an intermediate code between a source code and an object code, such as in a partially compiled form, or in any other desirable form.
De même, l'objet de la présente invention porte sur un premier support d'enregistrement lisible par un ordinateur sur lequel est enregistré un programme d'ordinateur comprenant des instructions pour l'exécution des étapes du procédé tel que décrit ci-dessus.  Similarly, the subject of the present invention relates to a first computer-readable recording medium on which is recorded a computer program comprising instructions for performing the steps of the method as described above.
D'une part, le support d'enregistrement peut être n'importe quel entité ou dispositif capable de stocker le programme. Par exemple, le support peut comporter un moyen de stockage, tel qu'une mémoire ROM, par exemple un CD-ROM ou une mémoire ROM de type circuit microélectronique, ou encore un moyen d'enregistrement magnétique, par exemple une disquette de type «floppy dise » ou un disque dur. D'autre part, ce support d'enregistrement peut également être un support transmis sible tel qu'un signal électrique ou optique, un tel signal pouvant être acheminé via un câble électrique ou optique, par radio classique ou hertzienne ou par faisceau laser autodirigé ou par d'autres moyens. Le programme d'ordinateur selon l'invention peut être en particulier téléchargé sur un réseau de type Internet. On the one hand, the recording medium can be any entity or device capable of storing the program. For example, the medium may comprise storage means, such as a ROM, for example a CD-ROM or a microelectronic circuit-type ROM, or a magnetic recording means, for example a diskette of the type " floppy says "or a hard drive. On the other hand, this recording medium can also be a transmitted medium such as an electrical or optical signal, such a signal can be conveyed via an electrical or optical cable, conventional radio or radio or self-directed laser beam or by other means. The computer program according to the invention can in particular be downloaded to an Internet type network.
Alternativement, le support d'enregistrement peut être un circuit intégré dans lequel le programme d'ordinateur est incorporé, le circuit intégré étant adapté pour exécuter ou pour être utilisé dans l'exécution du procédé en question.  Alternatively, the recording medium may be an integrated circuit in which the computer program is incorporated, the integrated circuit being adapted to execute or to be used in the execution of the method in question.
L'objet de la présente porte également sur un dispositif de compression adapté pour la mise en œuvre des étapes décrites ci-dessus.  The subject of the present one also relates to a compression device adapted for the implementation of the steps described above.
Plus précisément, le dispositif de compression comprend des moyens informatiques pour la compression d'un flux numérique vidéo comprenant au moins une image constituée par l'entrelacement d'au moins un premier et un deuxième champs ; selon la présente invention, ces champs comporte chacun au moins un plan de chrominance et un plan de luminance, la position relative des plans de chrominance et de luminance étant différente entre le premier et le deuxième champs.  More specifically, the compression device comprises computer means for compressing a digital video stream comprising at least one image constituted by the interleaving of at least a first and a second field; according to the present invention, these fields each comprise at least one chrominance plane and a luminance plane, the relative position of the chrominance and luminance planes being different between the first and second fields.
Avantageusement, le dispositif de compression selon la présente invention comporte un moyen de déphasage qui est configuré pour déphaser horizontalement et/ou verticalement le plan de chrominance, pour chaque champ de ladite au moins une image,  Advantageously, the compression device according to the present invention comprises a phase shift means which is configured to phase horizontally and / or vertically the chrominance plane, for each field of said at least one image,
Ce déphasage se fait selon une valeur de déphasage horizontal et/ou vertical déterminée de telle manière que la position relative des plans de chrominance et de luminance est constante.  This phase shift is made according to a horizontal and / or vertical phase shift value determined in such a way that the relative position of the chrominance and luminance planes is constant.
Avantageusement, le dispositif de compression selon la présente invention comporte un moyen de compression progressive qui est configuré pour encoder les champs successifs de ladite au moins une image.  Advantageously, the compression device according to the present invention comprises a progressive compression means which is configured to encode the successive fields of said at least one image.
Dans une variante de réalisation de la présente invention, le flux numérique vidéo est sous le format 4:2:0. Dans cette variante, le moyen de déphasage est configuré de telle manière que les plans de chrominance du premier champ sont décalés verticalement de n quart de pixel vers le bas, et les plans de chrominance du deuxième champ sont décalés verticalement de m quart de pixel vers le haut. Ici, n et m sont des entiers positifs compris entre 1 et 3. In an alternative embodiment of the present invention, the digital video stream is in the 4: 2: 0 format. In this variant, the phase shift means is configured in such a way that the chrominance planes of the first field are shifted vertically by n quarter of a pixel downwards, and the chrominance planes of the second field are shifted vertically by m quarter of a pixel towards the top. Here, n and m are positive integers between 1 and 3.
Avantageusement, le dispositif de compression selon la présente invention comporte un moyen d'émission qui est configuré pour émettre un message de signalisation comportant au moins une information relative à la valeur de déphasage horizontal et/ou vertical.  Advantageously, the compression device according to the present invention comprises a transmission means which is configured to transmit a signaling message comprising at least one information relating to the horizontal and / or vertical phase shift value.
Avantageusement, le moyen de compression progressive est configuré pour encoder les champs successifs de ladite au moins une image selon la norme HEVC.  Advantageously, the progressive compression means is configured to encode the successive fields of said at least one image according to the HEVC standard.
L'objet de la présente invention prévoit également un procédé de décompression d'un flux numérique vidéo comprenant au moins une image compressée selon le procédé de compression décrit précédemment.  The object of the present invention also provides a method of decompressing a digital video stream comprising at least one compressed image according to the compression method described above.
Avantageusement, le procédé de décompression selon la présente invention comporte une étape de décompression progressive consistant à décoder ladite au moins une image compressée.  Advantageously, the decompression method according to the present invention comprises a progressive decompression step of decoding said at least one compressed image.
Le procédé de décompression selon la présente invention comporte en outre une étape de déphasage inverse au cours de laquelle, pour chaque champ de ladite au moins une image décompressée, le plan de chrominance est déphasé horizontalement et/ou verticalement selon une valeur de déphasage horizontal et/ou vertical inverse déterminée.  The decompression method according to the present invention further comprises an inverse phase-shift step during which, for each field of said at least one decompressed image, the chrominance plane is phase-shifted horizontally and / or vertically according to a horizontal phase shift value and / or inverse vertical determined.
De préférence, la valeur de déphasage horizontal et/ou vertical inverse est fonction de la valeur de déphasage horizontal et/ou vertical.  Preferably, the horizontal and / or vertical phase shift value is a function of the horizontal and / or vertical phase shift value.
Dans une variante de réalisation de la présente invention, le flux numérique vidéo est sous le format 4:2:0. Dans cette variante, lors de l'étape de déphasage inverse, les plans de chrominance du premier champ sont décalés verticalement de n quart de pixel vers le haut, et les plans de chrominance du deuxième champ sont décalés verticalement de m quart de pixel vers le bas.  In an alternative embodiment of the present invention, the digital video stream is in the 4: 2: 0 format. In this variant, during the inverse phase shift step, the chrominance planes of the first field are shifted vertically upwards by n quarter of a pixel, and the chrominance planes of the second field are shifted vertically by m quarter of a pixel towards the low.
Ici, n et m sont des entiers positifs compris entre 1 et 3.  Here, n and m are positive integers between 1 and 3.
Avantageusement, le procédé de décompression selon la présente invention comporte une étape de réception consistant à recevoir un message de signalisation comportant au moins une information relative à la valeur de déphasage horizontal et/ou vertical. Avantageusement, le procédé de décompression selon la présente invention comporte une étape de détermination consistant à déterminer la valeur de déphasage horizontal et/ou vertical inverse en fonction de la valeur de déphasage horizontal et/ou vertical reçue. Advantageously, the decompression method according to the present invention comprises a reception step of receiving a signaling message comprising at least one information relating to the horizontal and / or vertical phase shift value. Advantageously, the decompression method according to the present invention comprises a determination step of determining the horizontal and / or vertical phase shift value as a function of the received horizontal and / or vertical phase shift value.
De préférence, lors de l'étape de décompression progressive, les champs successifs de ladite au moins une image sont décodés selon la norme HEVC.  Preferably, during the progressive decompression step, the successive fields of said at least one image are decoded according to the HEVC standard.
Corrélativement, l'objet de la présente invention porte sur un deuxième programme d'ordinateur comportant des instructions adaptées pour l'exécution des étapes du procédé de décompression tel que décrit ci-dessus, ceci lorsque ledit programme d'ordinateur est exécuté par un ordinateur.  Correlatively, the object of the present invention relates to a second computer program including instructions adapted to perform the steps of the decompression method as described above, when said computer program is executed by a computer .
De la même façon, l'objet de la présente invention porte sur un deuxième support d'enregistrement lisible par un ordinateur sur lequel est enregistré un programme d'ordinateur comprenant des instructions pour l'exécution des étapes du procédé de décompression tel que décrit ci-dessus.  In the same way, the object of the present invention relates to a second computer-readable recording medium on which is recorded a computer program comprising instructions for performing the steps of the decompression method as described herein. -above.
Ce deuxième programme d'ordinateur et ce deuxième support d'enregistrement présentent les mêmes caractéristiques que celles mentionnées précédemment respectivement pour le premier programme d'ordinateur et le premier support d'enregistrement.  This second computer program and this second recording medium have the same characteristics as those mentioned previously respectively for the first computer program and the first recording medium.
Alternativement, l'objet de la présente invention porte sur un dispositif de décompression d'un flux numérique vidéo comprenant au moins une image compressée selon le procédé de compression décrit ci-dessus.  Alternatively, the object of the present invention relates to a device for decompressing a digital video stream comprising at least one compressed image according to the compression method described above.
Avantageusement, le dispositif de décompression comporte un moyen de décompression progressive configuré pour décoder ladite au moins une image compressée.  Advantageously, the decompression device comprises a progressive decompression means configured to decode said at least one compressed image.
Avantageusement, le dispositif de décompression comporte en outre un moyen de déphasage inverse configuré pour déphaser horizontalement et/ou verticalement le plan de chrominance, pour chaque champ de ladite au moins une image décompressée, selon une valeur de déphasage horizontale et/ou verticale inverse déterminée.  Advantageously, the decompression device further comprises an inverse phase shift means configured to phase horizontally and / or vertically the chrominance plane, for each field of said at least one decompressed image, according to a determined horizontal and / or vertical phase shift value. .
De préférence, la valeur de déphasage horizontal et/ou vertical inverse est fonction de la valeur de déphasage horizontal et/ou vertical. Dans une variante de réalisation de la présente invention, le flux numérique vidéo est sous le format 4:2:0. Dans cette variante, le moyen de déphasage inverse est configuré de telle manière que, pour chaque champ de ladite au moins une image décompressée, les plans de chrominance du premier champ sont décalés verticalement de n quart de pixel vers le bas, et les plans de chrominance du deuxième champ sont décalés verticalement de m quart de pixel vers le haut. Preferably, the horizontal and / or vertical phase shift value is a function of the horizontal and / or vertical phase shift value. In an alternative embodiment of the present invention, the digital video stream is in the 4: 2: 0 format. In this variant, the inverse phase shift means is configured in such a way that, for each field of the said at least one decompressed image, the chrominance planes of the first field are offset vertically by n quarter of a pixel downwards, and the planes of chrominance of the second field are shifted vertically upward by one quarter of a pixel.
Ici, n et m sont des entiers positifs compris entre 1 et 3.  Here, n and m are positive integers between 1 and 3.
Avantageusement, le dispositif de décompression comporte un moyen de réception configuré pour recevoir un message de signalisation comportant au moins une information relative à la valeur de déphasage horizontale et/ou verticale.  Advantageously, the decompression device comprises receiving means configured to receive a signaling message comprising at least one information relating to the horizontal and / or vertical phase shift value.
Avantageusement, le dispositif de décompression comporte en outre un moyen de détermination configuré pour déterminer la valeur de déphasage horizontal et/ou vertical inverse en fonction de la valeur de déphasage horizontal et/ou vertical reçue.  Advantageously, the decompression device further comprises a determination means configured to determine the horizontal and / or vertical phase shift value as a function of the received horizontal and / or vertical phase shift value.
Avantageusement, le moyen de décompression progressive est configuré de telle manière que les champs successifs de ladite au moins une image sont décodés selon la norme HEVC.  Advantageously, the progressive decompression means is configured in such a way that successive fields of said at least one image are decoded according to the HEVC standard.
Ainsi, l'objet de la présente invention, par ses différents aspects fonctionnels et structurels, permet de compresser/décompresser une image entrelacée avec un encodeur/décodeur adapté aux images progressives.  Thus, the object of the present invention, by its various functional and structural aspects, makes it possible to compress / decompress an interlaced image with an encoder / decoder adapted to progressive images.
Brève description des figures annexées Brief description of the attached figures
D'autres caractéristiques et avantages de la présente invention ressortiront de la description ci-dessous, en référence aux figures la à 4 annexées qui en illustrent un exemple de réalisation dépourvu de tout caractère limitatif et sur lesquelles :  Other characteristics and advantages of the present invention will emerge from the description below, with reference to the appended FIGS. 1 to 4, which illustrate an embodiment of this embodiment devoid of any limiting character and in which:
les figures la et lb représentent chacune de façon schématique la position la plus courante des composantes de chrominance et de luminance dans le cas du format 4:2:0 progressif et du cas du format 4:2:0 entrelacée, la figure 2 représente de façon schématique un dispositif de compression selon un exemple de réalisation de la présente invention,  FIGS. 1a and 1b each schematically represent the most common position of the chrominance and luminance components in the case of the progressive 4: 2: 0 format and the case of the interlaced 4: 2: 0 format, FIG. schematically a compression device according to an exemplary embodiment of the present invention,
la figure 3 représente de façon schématique un dispositif de décompression selon un exemple de réalisation de la présente invention, la figure 4 représente un organigramme illustrant le procédé de compression/décompression selon un exemple de réalisation avantageux de la présente invention. FIG. 3 schematically represents a decompression device according to an exemplary embodiment of the present invention, FIG. 4 represents a flowchart illustrating the compression / decompression method according to an advantageous embodiment of the present invention.
Description détaillée d'un mode de réalisation avantageux de la présente invention Un procédé de compression/décompression et un dispositif de compression/décompression conformes à un exemple de réalisation avantageux de la présente invention vont maintenant être décrits en faisant référence conjointement aux figures la à 4.  DETAILED DESCRIPTION OF AN ADVANCED EMBODIMENT OF THE PRESENT INVENTION A compression / decompression method and a compression / decompression device according to an advantageous exemplary embodiment of the present invention will now be described with reference to FIGS. .
Dans l'exemple décrit ici, une image entrelacée est une image constituée par l'entrelacement d'un premier champ (ou « top field ») et d'un deuxième champ (ou « bottom field ») comportant chacun deux plans de chrominance et un plan de luminance.  In the example described here, an interlaced image is an image formed by the interleaving of a first field (or "top field") and a second field (or "bottom field") each having two chrominance planes and a luminance plan.
L'objet de la présente invention vise à permettre la compression/décompression d'une telle image entrelacée avec un encodeur/décodeur adapté aux images progressives.  The object of the present invention is to allow compression / decompression of such an interlaced image with an encoder / decoder adapted to progressive images.
Comme évoqué précédemment, des exemples d'images progressive et entrelacée selon le format 4:2:0 sont représentés respectivement aux figures la et lb ; ces figures représentent plus précisément la position des plans de chrominance et de luminance dans de telles images :  As mentioned above, examples of progressive and interlaced images in the 4: 2: 0 format are shown respectively in Figures 1a and 1b; these figures more precisely represent the position of the chrominance and luminance planes in such images:
Dans ces figures la et lb, les « X » représentent la position de la luminance, et les « O » représentent la position de la chrominance.  In these figures la and lb, the "X" represent the position of the luminance, and the "O" represent the position of the chrominance.
Comme il l'a déjà été observé précédemment, pour une image entrelacée As previously observed, for an interlaced image
(figure lb), la position relative de la luminance et de la chrominance est différente entre le premier champ tf (pour « top field ») et le deuxième champ bf (pour « bottom field »), ce qui rend inefficace la compression/décompression avec un encodeur/décodeur classique pour images progressives. (figure lb), the relative position of luminance and chrominance is different between the first field tf (for "top field") and the second field bf (for "bottom field"), which makes compression / decompression ineffective with a conventional encoder / decoder for progressive images.
Pour remédier à ce problème, la présente invention propose un dispositif informatique de compression 100 tel qu'illustré en figure 2 dans lequel, préalablement à la compression en tant que telle, on prévoit un moyen de déphasage Ml qui est configuré pour déphaser horizontalement et verticalement le plan de chrominance pour chaque champ tf et bf de l'image I, ceci lors d'une étape préalable de déphasage SI. Ce déphasage se fait selon des valeurs de déphasage horizontal dh et vertical dv qui sont déterminées de sorte que la position relative des plans de chrominance et de luminance est constante, comme c'est le cas pour une image progressive telle qu'illustrée en figure la. To remedy this problem, the present invention proposes a computer-based compression device 100 as illustrated in FIG. 2, in which, prior to the compression as such, provision is made for a phase shift means M 1 which is configured to phase out horizontally and vertically. the chrominance plane for each field tf and bf of the image I, this during a prior step of phase shift SI. This phase shift is done according to horizontal phase shift values dh and vertical dv which are determined so that the relative position of the chrominance and luminance planes is constant, as is the case for a progressive image as illustrated in FIG. .
Dans l'exemple décrit ici se référant à une image au format 4:2:0, les deux plans de chrominance du premier champ tf sont décalés verticalement d'un quart de pixel vers le bas, et les plans de chrominance du deuxième champ bf sont décalés verticalement d'un quart de pixel vers le haut.  In the example described here referring to a 4: 2: 0 format image, the two chrominance planes of the first field tf are vertically offset by a quarter of a pixel downwards, and the chrominance planes of the second field bf are shifted vertically one quarter of a pixel upward.
Dans l'exemple décrit ici, suite à ce déphasage, le dispositif informatique 100 comporte un moyen de compression progressive M2 configuré pour encoder, lors d'une étape de compression progressive S2, les champs successifs tf et bf de l'image I en sorte d'obtenir une image compressée Γ.  In the example described here, following this phase shift, the computing device 100 comprises a progressive compression means M2 configured to encode, during a progressive compression step S2, the successive fields tf and bf of the image I so that to obtain a compressed image Γ.
De préférence, cette compression se fait selon la norme HEVC.  Preferably, this compression is done according to the HEVC standard.
Comme illustré en figure 2, parallèlement à cette compression, le dispositif informatique 100 comporte un moyen d'émission M3 permettant d'émettre, avec le flux compressé, un message de signalisation ms qui comporte au moins une information relative aux valeurs de déphasage horizontal dh et vertical dv.  As illustrated in FIG. 2, in parallel with this compression, the computer device 100 comprises a transmission means M3 making it possible to transmit, with the compressed stream, an ms message message which comprises at least one piece of information relating to the horizontal phase shift values dh. and vertical dv.
Corrélativement, tel qu'illustré en figure 3, la présente invention prévoit un dispositif informatique de décompression 200 qui est adapté pour décompresser l'image Γ.  Correlatively, as illustrated in Figure 3, the present invention provides a computer decompression device 200 which is adapted to decompress the image Γ.
A cet effet, le dispositif informatique 200 comprend un moyen de décompression progressive M4 qui est configuré pour décoder l'image compressée Γ, et obtenir une image Γ ' .  For this purpose, the computing device 200 comprises a progressive decompression means M4 which is configured to decode the compressed image Γ, and obtain an image Γ '.
Ce moyen de décompression est initialement prévu pour les images progressives. On comprend ici que, grâce à la présente invention, le dispositif informatique 200 peut donc s'adapter indifféremment au décodage d'images progressives ou entrelacées.  This decompression means is initially provided for progressive images. It is understood here that, thanks to the present invention, the computer device 200 can therefore adapt indifferently to the decoding of progressive or interlaced images.
Dans l'exemple décrit ici, cette décompression se fait selon la norme HEVC. In the example described here, this decompression is done according to the HEVC standard.
Dans l'exemple décrit ici, le dispositif informatique 200 comporte un moyen de réception M6 configuré pour recevoir, lors d'une étape de réception S6, le message de signalisation ms qui a été précédemment par le dispositif 100. Le dispositif informatique 200 comporte en outre un moyen de détermination M7 configuré pour déterminer, lors d'une étape de détermination S7, les valeurs de déphasage horizontal dhi et vertical dvi inverse en fonction des informations contenues dans le message de signalisation ms. In the example described here, the computer device 200 comprises a reception means M6 configured to receive, during a reception step S6, the ms message message that was previously by the device 100. The computer device 200 further comprises a determination means M7 configured to determine, during a determination step S7, the horizontal phase shift values dhi and vertical dvi inverse according to the information contained in the ms signaling message.
Dans l'exemple décrit ici, le dispositif informatique 200 comporte un moyen de déphasage inverse M5 configuré pour déphaser horizontalement et verticalement, lors d'une étape de déphasage inverse S5, le plan de chrominance pour chaque champ tf et bf de l'image décompressée I" .  In the example described here, the computer device 200 comprises an inverse phase shift means M5 configured to phase shift horizontally and vertically, during an inverse phase shift step S5, the chrominance plane for each field tf and bf of the decompressed image. I ".
Ce déphasage inverse se fait selon les valeurs de déphasage horizontal dhi et vertical dvi inverse déterminées préalablement par le moyen de détermination M7.  This inverse phase shift is made according to the horizontal phase shift values dhi and vertical dvi inverse previously determined by the determination means M7.
Dans l'exemple décrit ici se référant au format 4:2:0, les deux plans de chrominance du premier champ tf sont décalés verticalement d'un quart de pixel vers le haut, et les plans de chrominance du deuxième champ bf sont décalés verticalement d'un quart de pixel vers le bas.  In the example described here referring to the 4: 2: 0 format, the two chrominance planes of the first field tf are vertically offset by a quarter of a pixel upwards, and the chrominance planes of the second field bf are vertically offset. a quarter of a pixel down.
Ainsi, grâce à la présente invention, avant codage, la position relative des plans chrominance est déplacée de manière à fournir à l'encodeur vidéo une position relative constante et connue sur tous les champs fournis ; et, après le décodage, les plans de chrominance sont replacés à la position d'origine pour reconstruire l'image I.  Thus, thanks to the present invention, before coding, the relative position of the chrominance planes is moved so as to provide the video encoder with a constant and known relative position on all the fields provided; and, after decoding, the chrominance planes are relocated to the original position to reconstruct the I-frame.
Pour permettre le repositionnement après décodage, une information relative au déphasage accompagne le flux compressé. Dans l'exemple décrit ici, cette information est véhiculée par le message de signalisation ms qui est un message du type SEI (pour « Supplemental Enhancement Information ») transporté dans le flux compressé HEVC.  To allow repositioning after decoding, information relating to the phase shift accompanies the compressed stream. In the example described here, this information is conveyed by the ms signaling message which is a message of the type SEI (for "Supplemental Enhancement Information") carried in the compressed stream HEVC.
Dans l'exemple décrit ici, ce message du type SEI est modifié par l'ajout des champs suivants en gras :  In the example described here, this message of the type SEI is modified by adding the following fields in bold:
field_indication(payloadSize ) field_indication (payloadSize)
{ sequence ype ïag {sequence ype ïag
progressive_source ïag  progressive_source ïag
bottomjield lag  bottomjield lag
top_field_first lag )  top_field_first lag)
duplicate ïag  duplicate ïag
chroma_sample_loc_delta _present _Jlag reserved_zero_2bits /* equal to 0 */ chroma_sample_loc_delta _present _Jlag reserved_zero_2bits / * equal to 0 * /
if (chroma_sample_loc_delta jpresentjlag == 1 )  if (chroma_sample_loc_delta jpresentjlag == 1)
{ chroma_sample_loc_vdelta  {chroma_sample_loc_vdelta
chroma_sample_loc_hdelta  chroma_sample_loc_hdelta
}  }
} }
Le champ binaire « chroma_s ample _loc_delta _present_flag », lorsqu'il est à 1, signale la présence des deux champs supplémentaires « chroma_sample_loc_vdelta » et « chroma_sample_loc_hdelta ».  The binary field "chroma_s ample _loc_delta _present_flag", when it is at 1, indicates the presence of the two additional fields "chroma_sample_loc_vdelta" and "chroma_sample_loc_hdelta".
Les « chroma_s ample _loc_v delta » et « chroma_s ample _loc_hdelta » représentent les déphasages inverses respectivement verticaux et horizontaux à réaliser après le décodage de manière à retrouver la position relative des plans de chrominance de l'image source I.  The "chroma_s ample _loc_v delta" and "chroma_s ample _loc_hdelta" represent the respectively vertical and horizontal inverse phase shifts to be carried out after the decoding so as to find the relative position of the chrominance planes of the source image I.
Ces champs sont exprimés en unités signées d'un quart de pixel, ce qui permet d'avoir un déphasage de +/- 1, 2 ou 3 quarts de pixel.  These fields are expressed in signed units of a quarter of a pixel, which makes it possible to have a phase shift of +/- 1, 2 or 3 quarts of pixel.
Dans l'exemple décrit ici, et comme illustré en figures 2 et 3, on comprend que les différentes étapes du procédé de compression et de décompression sont respectivement commandées par un premier PGl et un deuxième PG2 programmes d'ordinateur contenus sur un premier Cil et un deuxième CI support d'enregistrement : le support Cil étant intégré sur le dispositif informatique de compression 100 et le support CI2 étant intégré sur dispositif informatique de décompression 200.  In the example described here, and as illustrated in FIGS. 2 and 3, it will be understood that the various steps of the compression and decompression method are respectively controlled by a first PG1 and a second PG2 computer program contained on a first Cile and a second recording medium CI: the support Cil being integrated on the computing device 100 and the support CI2 being integrated on a computer decompression device 200.
Il devra être observé que cette description détaillée porte sur un exemple de réalisation particulier de la présente invention, mais qu'en aucun cas cette description ne revêt un quelconque caractère limitatif à l'objet de l'invention ; bien au contraire, elle a pour objectif d'ôter toute éventuelle imprécision ou toute mauvaise interprétation des revendications qui suivent.  It should be observed that this detailed description relates to a particular embodiment of the present invention, but in no case this description is of any nature limiting to the subject of the invention; on the contrary, its purpose is to remove any imprecision or misinterpretation of the claims that follow.

Claims

REVENDICATIONS
1. Procédé de compression d'un flux numérique vidéo comprenant au moins une image (I) constituée par l'entrelacement d'au moins un premier (tf) et un deuxième (bf) champs comportant chacun au moins un plan de chrominance et un plan de luminance, la position relative des plans de chrominance et de luminance étant différente entre le premier (tf) et le deuxième (bf) champs, A method of compressing a digital video stream comprising at least one image (I) constituted by the interleaving of at least a first (tf) and a second (bf) field each comprising at least one chrominance plane and a luminance plane, the relative position of the chrominance and luminance planes being different between the first (tf) and the second (bf) fields,
caractérisé en ce qu'il comporte les étapes suivantes : characterized in that it comprises the following steps:
une étape préalable de déphasage (SI) au cours de laquelle, pour chaque champ (tf, bf) de ladite au moins une image (I), ledit au moins un plan de chrominance est déphasé horizontalement et/ou verticalement selon une valeur de déphasage horizontal (dh) et/ou vertical (dv) déterminée pour obtenir une position relative des plans de chrominance et de luminance constante, et  a prior step of phase shift (SI) during which, for each field (tf, bf) of said at least one image (I), said at least one chrominance plane is phase shifted horizontally and / or vertically according to a phase shift value horizontal (dh) and / or vertical (dv) determined to obtain a relative position of the chrominance planes and constant luminance, and
une étape de compression (S2) progressive consistant à encoder les champs successifs (tf, bf) de ladite au moins une image (I).  a step of progressive compression (S2) consisting in encoding the successive fields (tf, bf) of said at least one image (I).
2. Procédé de compression selon la revendication 1, le flux numérique vidéo étant sous le format 4:2:0, caractérisé en ce que, lors de l'étape de déphasage (SI), les plans de chrominance du premier champ (tf) sont décalés verticalement de n quart de pixel vers le bas, n étant un entier positif compris entre 1 et 3, et les plans de chrominance du deuxième champ (bf) sont décalés verticalement de m quart de pixel vers le haut, m étant un entier positif compris entre 1 et 3. 2. The compression method as claimed in claim 1, the digital video stream being in the 4: 2: 0 format, characterized in that, during the phase shift step (SI), the chrominance planes of the first field (tf) are vertically offset by n quarter of a pixel downward, where n is a positive integer between 1 and 3, and the chrominance planes of the second field (bf) are vertically offset by m quarter pixel up, m being an integer positive between 1 and 3.
3. Procédé de compression selon la revendication 1 ou 2, caractérisé en ce qu'il comporte une étape d'émission (S3) d'un message de signalisation (ms) comportant au moins une information relative aux valeurs de déphasage horizontal (dh) et/ou vertical (dv). 3. A method of compression according to claim 1 or 2, characterized in that it comprises a step of transmitting (S3) a signaling message (ms) comprising at least one information relating to horizontal phase shift values (dh). and / or vertical (dv).
4. Procédé de compression selon l'une quelconque des revendications précédentes, caractérisé en ce que, lors de l'étape de compression (S2), les champs successifs (tf, bf) de ladite au moins une image (I) sont encodés selon la norme HEVC. 4. A compression method according to any one of the preceding claims, characterized in that, during the compression step (S2), the successive fields (tf, bf) of said at least one image (I) are encoded according to the HEVC standard.
5. Programme d'ordinateur (PG1) comportant des instructions adaptées pour l'exécution des étapes du procédé selon l'une quelconque des revendications 1 à 4 lorsque ledit programme d'ordinateur (PG1) est exécuté par un ordinateur. A computer program (PG1) having instructions adapted for performing the steps of the method according to any one of claims 1 to 4 when said computer program (PG1) is executed by a computer.
6. Support d'enregistrement (Cil) lisible par un ordinateur sur lequel est enregistré un programme d'ordinateur (PG1) comprenant des instructions pour l'exécution des étapes du procédé selon l'une quelconque des revendications 1 à 4. A computer-readable recording medium (Cil) on which is recorded a computer program (PG1) comprising instructions for carrying out the steps of the method according to any one of claims 1 to 4.
7. Dispositif de compression (100) d'un flux numérique vidéo comprenant au moins une image (I) constituée par l'entrelacement d'au moins un premier et un deuxième champs (tf, bf) comportant chacun au moins un plan de chrominance et un plan de luminance, la position relative des plans de chrominance et de luminance étant différente entre le premier et le deuxième champs (tf, bf), 7. Device for compressing (100) a digital video stream comprising at least one image (I) constituted by the interleaving of at least a first and a second field (tf, bf) each comprising at least one chrominance plane and a luminance plane, the relative position of the chrominance and luminance planes being different between the first and second fields (tf, bf),
caractérisé en ce qu'il comporte : characterized in that it comprises:
- un moyen de déphasage (Ml) configuré pour déphaser horizontalement et/ou verticalement le plan de chrominance, pour chaque champ (tf, bf) de ladite au moins une image (I), selon une valeur de déphasage horizontal (dh) et/ou vertical (dv) déterminée de telle manière que la position relative des plans de chrominance et de luminance soit constante, et  a phase shift means (M1) configured to phase horizontally and / or vertically the chrominance plane, for each field (tf, bf) of said at least one image (I), according to a horizontal phase shift value (dh) and / or vertical (dv) determined in such a way that the relative position of the chrominance and luminance planes is constant, and
- un moyen de compression progressive (M2) configuré pour encoder les champs successifs (tf, bf) de ladite au moins une image (I).  a progressive compression means (M2) configured to encode the successive fields (tf, bf) of said at least one image (I).
8. Dispositif de compression (100) selon la revendication 7, le flux numérique vidéo étant sous le format 4:2:0, caractérisé en ce que le moyen de déphasage (Ml) est configuré de telle manière que les plans de chrominance du premier champ (tf) sont décalés verticalement de n quart de pixel vers le bas, n étant un entier positif compris entre 1 et 3, et les plans de chrominance du deuxième champ (bf) sont décalés verticalement de m quart de pixel vers le haut, m étant un entier positif compris entre 1 et 3. 8. The compression device (100) according to claim 7, the digital video stream being in the 4: 2: 0 format, characterized in that the phase shift means (M1) is configured in such a way that the chrominance planes of the first field (tf) are shifted vertically downwards by n quarter of a pixel, n being a positive integer between 1 and 3, and the chrominance planes of the second field (bf) are shifted vertically by m quarter of a pixel upwards, m being a positive integer between 1 and 3.
9. Dispositif de compression (100) selon la revendication 7 ou 8, caractérisé en ce qu'il comporte un moyen d'émission (M3) configuré pour émettre un message de signalisation (ms) comportant au moins une information relative aux valeurs de déphasage horizontal (dh) et/ou vertical (dv). 9. A compression device (100) according to claim 7 or 8, characterized in that it comprises a transmission means (M3) configured to transmit a signaling message (ms) comprising at least one information relating to the phase shift values. horizontal (dh) and / or vertical (dv).
10. Dispositif de compression (100) selon la revendication 7 à 9, caractérisé en ce que le moyen de compression progressive (M2) est configuré pour encoder les champs successifs (tf, bf) de ladite au moins une image (I) selon la norme HEVC. 10. A compression device (100) according to claim 7 to 9, characterized in that the progressive compression means (M2) is configured to encode the successive fields (tf, bf) of said at least one image (I) according to the HEVC standard.
11. Procédé de décompression d'un flux numérique vidéo comprenant au moins une image compressée (Γ) selon l'une quelconque des revendications 1 à 4, 11. A method of decompressing a digital video stream comprising at least one compressed image (Γ) according to any one of claims 1 to 4,
caractérisé en ce qu'il comporte les étapes suivantes : characterized in that it comprises the following steps:
- une étape de décompression progressive (S4) consistant à décoder ladite au moins une image compressée (Γ), et  a step of progressive decompression (S4) of decoding said at least one compressed image (Γ), and
- une étape de déphasage inverse (S5) au cours de laquelle, pour chaque champ a step of inverse phase shift (S5) during which, for each field
(tf, bf) de ladite au moins une image décompressée (I"), le plan de chrominance est déphasé horizontalement et/ou verticalement selon une valeur de déphasage horizontal (dhi) et/ou vertical (dvi) inverse déterminée, ladite valeur de déphasage horizontal (dhi) et/ou vertical (dvi) inverse étant fonction de la valeur de déphasage horizontal (dh) et/ou vertical (dv). (tf, bf) of said at least one decompressed image (I "), the chrominance plane is phase-shifted horizontally and / or vertically according to a determined horizontal (dhi) and / or vertical (dvi) phase-shift value, said value of horizontal phase shift (dhi) and / or vertical (dvi) inverse depending on the horizontal phase shift (dh) and / or vertical (dv).
12. Procédé de décompression selon la revendication 11, le flux numérique vidéo étant sous le format 4:2:0, caractérisé en ce que, lors de l'étape de déphasage inverse (S5), les plans de chrominance du premier champ sont décalés verticalement de n quart de pixel vers le haut, n étant un entier positif compris entre 1 et 3, et les plans de chrominance du deuxième champ sont décalés verticalement de m quart de pixel vers le bas, m étant un entier positif compris entre 1 et 3. 12. The decompression method as claimed in claim 11, the digital video stream being in the 4: 2: 0 format, characterized in that, during the inverse phase shift step (S5), the chrominance planes of the first field are shifted. vertically upwards of n quarter pixel, where n is a positive integer between 1 and 3, and the chrominance planes of the second field are vertically offset by m quarter pixel down, m being a positive integer between 1 and 3 3.
13. Procédé de décompression selon la revendication 11 ou 12, caractérisé en ce qu'il comporte une étape de réception (S6) consistant à recevoir un message de signalisation13. The method of decompression according to claim 11 or 12, characterized in that it comprises a receiving step (S6) of receiving a signaling message
(ms) comportant au moins une information relatives aux valeurs de déphasage horizontal (dh) et/ou vertical (dv), et en ce qu'il comporte une étape de détermination (S7) consistant à déterminer la valeur de déphasage horizontal (dhi) et/ou vertical (dvi) inverse en fonction de la valeur de déphasage horizontal (dh) et/ou vertical (dv) reçue. (ms) comprising at least one information relating to the phase shift values horizontal (dh) and / or vertical (dv), and in that it comprises a determination step (S7) of determining the horizontal (dhi) and / or vertical (dvi) phase shift value as a function of the value of horizontal phase shift (dh) and / or vertical phase (dv) received.
14. Procédé de décompression selon l'une quelconque des revendications 11 à 13, caractérisé en ce que, lors de l'étape de décompression progressive (S4), les champs (tf, bf) successifs de ladite au moins une image compressée (Γ) sont décodés selon la norme HEVC. 14. A method of decompression according to any one of claims 11 to 13, characterized in that, during the progressive decompression step (S4), the successive fields (tf, bf) of said at least one compressed image (Γ ) are decoded according to the HEVC standard.
15. Programme d'ordinateur (PG2) comportant des instructions adaptées pour l'exécution des étapes du procédé selon l'une quelconque des revendications 11 à 14, lorsque ledit programme d'ordinateur (PG2) est exécuté par un ordinateur. A computer program (PG2) having instructions adapted for performing the steps of the method according to any one of claims 11 to 14 when said computer program (PG2) is executed by a computer.
16. Support d'enregistrement (CI2) lisible par un ordinateur sur lequel est enregistré un programme d'ordinateur (PG2) comprenant des instructions pour l'exécution des étapes du procédé selon l'une quelconque des revendications 11 à 14. 16. Computer-readable recording medium (CI2) on which is recorded a computer program (PG2) comprising instructions for carrying out the steps of the method according to any one of claims 11 to 14.
17. Dispositif de décompression (200) d'un flux numérique vidéo comprenant au moins une image compressée (Γ) selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'il comporte : 17. Device for decompression (200) of a digital video stream comprising at least one compressed image (Γ) according to any one of claims 1 to 4, characterized in that it comprises:
- un moyen de décompression progressive (M4) configuré pour décoder ladite au moins une image compressée (Γ), et  a progressive decompression means (M4) configured to decode said at least one compressed image (Γ), and
- un moyen de déphasage inverse (M5) configuré pour déphaser horizontalement et/ou verticalement le plan de chrominance, pour chaque champ (tf, bf) de ladite au moins une image décompressée (I"), selon une valeur de déphasage horizontal (dhi) et/ou vertical (dvi) inverse déterminée, ladite valeur de déphasage horizontal (dhi) et/ou vertical (dvi) inverse étant fonction de la valeur de déphasage horizontal (dh) et/ou vertical (dv).  - inverse phase shift means (M5) configured to phase horizontally and / or vertically the chrominance plane, for each field (tf, bf) of said at least one decompressed image (I "), according to a horizontal phase shift value (dhi ) and / or vertical (dvi) determined inverse, said value of horizontal phase shift (dhi) and / or vertical (dvi) inverse being a function of the horizontal phase shift (dh) and / or vertical (dv).
18. Dispositif de décompression (200) selon la revendication 17, le flux numérique vidéo étant sous le format 4:2:0, caractérisé en ce que le moyen de déphasage inverse (M5) est configuré de telle manière que, pour chaque champ (tf, bf) de ladite au moins une image décompressée (I"), les plans de chrominance du premier champ (tf) sont décalés verticalement de n quart de pixel vers le bas, n étant un entier positif compris entre 1 et 3, et les plans de chrominance du deuxième champ (bf) sont décalés verticalement de m quart de pixel vers le haut, m étant un entier positif compris entre 1 et 3. 18. A decompression device (200) according to claim 17, the digital video stream being in the 4: 2: 0 format, characterized in that the inverse phase shift means (M5) is configured such that, for each field (tf, bf) of said at least one decompressed image (I "), the chrominance planes of the first field (tf) are vertically offset by n quarter of a pixel towards the bottom, n being a positive integer between 1 and 3, and the chrominance planes of the second field (bf) are shifted vertically upwards by m quarter pixel, m being a positive integer between 1 and 3.
19. Dispositif de décompression (200) selon la revendication 17 ou 18, caractérisé en ce qu'il comporte un moyen de réception (M6) configuré pour recevoir un message de signalisation (ms) comportant au moins une information relative aux valeurs de déphasage horizontal (dh) et/ou vertical (dv), et en ce qu'il comporte un moyen de détermination (M7) configuré pour déterminer la valeurs de déphasage horizontal (dhi) et/ou vertical (dvi) inverse en fonction de la valeur de déphasage horizontal (dh) et/ou vertical (dv) reçue. 19. Pressure relief device (200) according to claim 17 or 18, characterized in that it comprises a receiving means (M6) configured to receive a signaling message (ms) comprising at least one information relating to the horizontal phase shift values. (dh) and / or vertical (dv), and in that it comprises a determination means (M7) configured to determine the horizontal (dhi) and / or vertical (dvi) phase shift values as a function of the value of horizontal phase shift (dh) and / or vertical phase (dv) received.
20. Dispositif de décompression (200) selon l'une quelconque des revendications 17 à 19, caractérisé en ce que le moyen de décompression progressive (M4) est configuré de telle manière que les champs successifs de ladite au moins une image compressée (F) sont décodés selon la norme HEVC. 20. A decompression device (200) according to any one of claims 17 to 19, characterized in that the progressive decompression means (M4) is configured such that the successive fields of said at least one compressed image (F) are decoded according to the HEVC standard.
EP13723843.2A 2012-04-23 2013-04-22 Progressive compression/decompression of a digital video stream comprising at least one interleaved image Ceased EP2842324A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1253717A FR2989856B1 (en) 2012-04-23 2012-04-23 PROGRESSIVE COMPRESSION / DECOMPRESSION OF VIDEO DIGITAL STREAM COMPRISING AT LEAST ONE INTERLACED IMAGE
PCT/FR2013/050882 WO2013160597A1 (en) 2012-04-23 2013-04-22 Progressive compression/decompression of a digital video stream comprising at least one interleaved image

Publications (1)

Publication Number Publication Date
EP2842324A1 true EP2842324A1 (en) 2015-03-04

Family

ID=48468621

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13723843.2A Ceased EP2842324A1 (en) 2012-04-23 2013-04-22 Progressive compression/decompression of a digital video stream comprising at least one interleaved image

Country Status (4)

Country Link
US (1) US20150131714A1 (en)
EP (1) EP2842324A1 (en)
FR (1) FR2989856B1 (en)
WO (1) WO2013160597A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170113713A (en) * 2013-12-13 2017-10-12 브이아이디 스케일, 인크. Color gamut scalable video coding device and method for the phase alignment of luma and chroma using interpolation

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3797209B2 (en) * 2001-11-30 2006-07-12 ソニー株式会社 Image information encoding method and apparatus, image information decoding method and apparatus, and program
US7136417B2 (en) * 2002-07-15 2006-11-14 Scientific-Atlanta, Inc. Chroma conversion optimization
US7956930B2 (en) * 2006-01-06 2011-06-07 Microsoft Corporation Resampling and picture resizing operations for multi-resolution video coding and decoding
US8054886B2 (en) * 2007-02-21 2011-11-08 Microsoft Corporation Signaling and use of chroma sample positioning information
JP5035154B2 (en) * 2008-03-07 2012-09-26 富士通株式会社 Video signal processing apparatus and video signal processing method
KR101557163B1 (en) * 2008-12-23 2015-10-05 삼성전자주식회사 Apparatus and method for converting image in an image processing system

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
"Advanced video coding for generic audiovisual services Recommendation", INTERNET CITATION, 1 March 2009 (2009-03-01), pages 1 - 670, XP008146205, Retrieved from the Internet <URL:http://www.itu.int/rec/T-REC-H.264> [retrieved on 20111207] *
ANONYMOUS: "High Efficiency Video Coding", 27 March 2012 (2012-03-27), XP055738297, Retrieved from the Internet <URL:https://en.wikipedia.org/w/index.php?title=High_Efficiency_Video_Coding&oldid=484228467> [retrieved on 20201009] *
See also references of WO2013160597A1 *

Also Published As

Publication number Publication date
FR2989856A1 (en) 2013-10-25
US20150131714A1 (en) 2015-05-14
WO2013160597A1 (en) 2013-10-31
FR2989856B1 (en) 2014-11-28

Similar Documents

Publication Publication Date Title
TWI663880B (en) Chroma prediction method and apparatus
EP3209021B1 (en) Recording medium storing coded image data
EP3061246B1 (en) Method for encoding and decoding images, device for encoding and decoding images and corresponding computer programs
FR2903556A1 (en) Digital image encoding method for e.g. mobile phone, involves associating information, representative of bit rate and distortion corresponding to target definition comprised between lower and upper definition layers, with coding result
EP4009633A1 (en) Method and recording medium storing coded image data
EP2380352B1 (en) Method for segmentation-based image coding
WO2019211541A2 (en) Method and device for multi-view video decoding and method and device for image processing
FR3084552A1 (en) METHOD FOR FORMING A SEQUENCE OF OUTPUT IMAGES FROM A SEQUENCE OF INPUT IMAGES, METHOD FOR RECONSTRUCTING A SEQUENCE OF INPUT IMAGES FROM A SEQUENCE OF OUTPUT IMAGES, DEVICES, SERVER EQUIPMENT, CUSTOMER EQUIPMENT AND RELATED COMPUTER PROGRAMS
EP2443835A1 (en) Encoding motion vectors using competition between predictors
WO2017037421A1 (en) Image compression
EP2842324A1 (en) Progressive compression/decompression of a digital video stream comprising at least one interleaved image
FR2894739A1 (en) ENCODING METHOD, DECODING METHOD, ENCODING DEVICE, AND VIDEO DATA DECODING DEVICE
FR2944936A1 (en) METHODS OF ENCODING AND DECODING AN IMAGE DATA BLOCK, CODING AND DECODING DEVICES IMPLEMENTING SAID METHODS
EP4140136A1 (en) Methods and devices for coding and decoding a multi-view video sequence
WO2017129880A1 (en) Method for encoding and decoding data, device for encoding and decoding data, and corresponding computer programs
WO2005057934A2 (en) Methods and apparatus for spatial scalable compression scehme
WO2020157413A1 (en) Method and device for coding and decoding data corresponding to a video sequence
US20200077096A1 (en) Compression of segmented video
EP2914005B1 (en) Video stream generator
FR2990097A1 (en) SPATIALLY SCALABLE CODING AND DECODING METHODS AND CORRESPONDING DEVICES
FR2957744A1 (en) METHOD FOR PROCESSING A VIDEO SEQUENCE AND ASSOCIATED DEVICE
FR3124671A1 (en) Methods of decoding and encoding an image, devices and associated signal
FR3046711A1 (en) COMPRESSION AND DECOMPRESSION OF VIDEO DATA
SE542242C2 (en) Compression of segmented video
FR2891966A1 (en) DEVICES AND METHODS FOR SCALING AND DECODING IMAGE DATA STREAMS, SIGNAL, COMPUTER PROGRAM AND QUALITY ADAPTATION MODULE OF CORRESPONDING IMAGES

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20141022

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20170901

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

REG Reference to a national code

Ref country code: DE

Ref legal event code: R003

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 20210405