WO2010058895A2 - Appareil et procédé de codage/décodage d'un signal vidéo - Google Patents

Appareil et procédé de codage/décodage d'un signal vidéo Download PDF

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Publication number
WO2010058895A2
WO2010058895A2 PCT/KR2009/004576 KR2009004576W WO2010058895A2 WO 2010058895 A2 WO2010058895 A2 WO 2010058895A2 KR 2009004576 W KR2009004576 W KR 2009004576W WO 2010058895 A2 WO2010058895 A2 WO 2010058895A2
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WIPO (PCT)
Prior art keywords
image
template
filter coefficient
unit
motion
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PCT/KR2009/004576
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English (en)
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WO2010058895A3 (fr
Inventor
Il-Hong Shin
Jung-Won Kang
Jeong-Ju Yoo
Jin-Woo Hong
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Electronics And Telecommunications Research Institute
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Priority to US13/130,905 priority Critical patent/US20110228854A1/en
Publication of WO2010058895A2 publication Critical patent/WO2010058895A2/fr
Publication of WO2010058895A3 publication Critical patent/WO2010058895A3/fr

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    • 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
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • H04N19/51—Motion estimation or motion compensation
    • H04N19/573—Motion compensation with multiple frame prediction using two or more reference frames in a given prediction direction
    • 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
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/105—Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
    • 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
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • H04N19/51—Motion estimation or motion compensation
    • 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
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding

Definitions

  • the present invention relates to an apparatus and method for encoding and decoding a video signal, and more particularly, to an apparatus and method for encoding and decoding a video signal that may estimate a motion using a template and may perform an adaptive motion compensation using the template, when decoding or encoding a video signal.
  • H.264 indicates a video compression standard that may provide a significantly high compression rate in comparison to MPEG-4 or H.263+ corresponding to a previous video compression standard.
  • H.264 is also referred to as H.264/advanced video coding (AVC).
  • AVC advanced video coding
  • paid or free services are being provided using H.264/AVC.
  • the free services may include, for example, a digital multimedia broadcasting (DMB) service.
  • the paid services may include communication provider services, for example, June of SKT and Fimm of KTF, and a satellite DMB service.
  • various types of H.264/AVC codec based services may be provided to users.
  • H.264 may provide video data of a high quality corresponding to a DVD level at a speed less than 1 Mbps. Accordingly, in the case of a high-speed Internet access through a radio, a satellite, or an asymmetric digital subscriber line (ADSL), H.264 may provide perfect motion picture video data of 30 frames per second (fps).
  • a current MPEG-2 based broadcasting system is also changed to H.264/AVC-based broadcasting system
  • a broadcasting service with a further enhanced high definition, for example, about twice greater than MPEG-2, using a bandwidth 19.39 Mbps that is currently used by a current high definition broadcasting service.
  • the number of channels may increase by about twice greater than the current number of channels.
  • a block including 16 x 16 pixels indicates a single macro block.
  • the macro block may be divided into various sizes of blocks.
  • a macro block mode may be determined using an intra prediction in a pixel area, various types of block sizes, a multi-reference screen, and a ratio-distortion optimization scheme. Through this, in comparison to an existing motion picture compression standard, it is possible to save bits of about 50 % with respect to the same screen quality.
  • JVT Joint Video Team
  • KTA manufacturing key technology area
  • a filter coefficient for 1/2 or 1/4 pixel motion compensation is fixed.
  • a non-separable adaptive interpolation filtering scheme is currently applied.
  • the non-separable adaptive interpolation filtering scheme may obtain an adaptive filter coefficient according to a pixel 1, 1/2, or 1/4 of a motion vector that is selected in a current image and a motion-compensated image generated after estimating a motion.
  • the non-separable adaptive interpolation filtering scheme may transmit the adaptive filter coefficient to a decoding unit.
  • the decoding unit may perform a motion compensation calculation and filtering according to the filter coefficient and then generate a reference image frame.
  • a transmission may be performed by assuming a 6 x 6 two-dimensional (2D) filter with respect to a single frame screen.
  • the above scheme generally considers the entire single frame as a target. Therefore, when the above scheme is applied to a significantly variable image, the efficiency may be small.
  • An aspect of the present invention provides an apparatus and method for encoding and decoding a video signal.
  • Another aspect of the present invention also provides an apparatus and method for encoding and decoding a video signal that may estimate a motion using a template and may adaptively compensate for the motion using the template, when decoding or encoding a video signal.
  • Another aspect of the present invention also provides an apparatus and method for encoding and decoding a video signal that may estimate a motion using a template, calculate a motion compensation filter coefficient using the template, filter a predicted image using the filter coefficient, and perform an adaptive motion compensation, when encoding or decoding a video signal.
  • an apparatus for encoding a video signal including: a reference image storage unit to store a reference image; a template motion estimation unit to estimate a motion between an input image and the reference image using a template, and to generate motion estimation information; an adaptive motion compensation unit to generate a predicted image using the motion estimation information and the reference image, to calculate a filter coefficient with respect to the predicted image using the template, and to filter the predicted image using the filter coefficient; a transformation and quantization unit to perform integer-transformation and quantization for a differential image that is a difference between the input image and the filtered predicted image; and an entropy encoding unit to entropy encode the quantized differential image and to output an image stream.
  • an apparatus for decoding a video signal including: an entropy decoding unit to entropy decode an input image stream; an inverse-transformation and inverse-quantization unit to perform inverse-quantization and inverse-transformation for the decoded input image stream and to recover a differential image; a de-blocking filter to de-blocking filter an image where a predicted image and the differential image are added, and to generate an output image; a reference image storage unit to store the output image as a reference image for the predicted image; a template motion estimation unit to estimate a motion between recent reference images using a template, and to generate motion estimation information; and an adaptive motion compensation unit to generate a subsequent predicted image using the motion estimation information and the reference image, to calculate a filter coefficient, and to filter the subsequent predicted image using the filter coefficient.
  • a method of encoding a video signal including: verifying a template and estimating a motion of the template using an input image to be encoded and a reference image to generate motion estimation information, when the input image is received; generating a predicted image using the motion estimation information and the reference image; calculating a filter coefficient with respect to the predicted image using the template; filtering the predicted image using the filter coefficient; calculating a difference between the input image and the filtered predicted image to generate a differential image; performing integer-transformation and quantization for the differential image; and entropy encoding the quantized differential image to output an image stream.
  • a method of decoding a video signal including: entropy decoding an input image stream, when the input image stream is received; performing inverse-quantization and inverse-transformation for the decoded input image stream to recover a differential image; de-blocking filtering an image where a predicted image and the differential image are added, to generate an output image; storing the output image as a reference image; verifying a template and estimating a motion of the template using recent reference images to generate motion estimation information; generating a subsequent predicted image using the motion estimation information and the reference image; calculating a filter coefficient with respect to the subsequent predicted image using the template; and filtering the subsequent predicted image using the filter coefficient.
  • an apparatus and method for encoding and decoding a video signal may estimate a motion using a template, calculate a motion compensation filter coefficient using the template, perform filtering using the filter coefficient, and perform an adaptive motion compensation, when encoding or decoding a video signal. Since the motion is estimated using the template, there is no need to transmit a motion vector. Also, the adaptive motion compensation may be performed using the calculated filter coefficient.
  • FIG. 1 is a block diagram illustrating a configuration of an encoding apparatus according to an embodiment of the present invention
  • FIG. 2 is a diagram illustrating a configuration of a template with respect to a current macro block in an encoding and decoding apparatus according to an embodiment of the present invention
  • FIG. 3 is a block diagram illustrating a configuration of an adaptive motion compensation unit in an encoding and decoding apparatus according to an embodiment of the present invention
  • FIG. 4 is a block diagram illustrating a configuration of a decoding apparatus according to an embodiment of the present invention.
  • FIG. 5 is a flowchart illustrating a method of encoding an image in an encoding apparatus according to an embodiment of the present invention.
  • FIG. 6 is a flowchart illustrating a method of decoding an image stream in a decoding apparatus according to an embodiment of the present invention.
  • an apparatus and method for encoding and decoding a video signal may estimate a motion using a template, calculate a motion compensation filter coefficient using the template, perform filtering using the filter coefficient, and perform an adaptive motion compensation, when encoding or decoding a video signal.
  • FIG. 1 is a block diagram illustrating a configuration of an encoding apparatus according to an embodiment of the present invention.
  • the encoding apparatus may include an encoding control unit 110, a transformation and quantization unit 120, an entropy encoding unit 130, an inverse-transformation and inverse-quantization unit 140, a de-blocking filter 150, a reference image storage unit 160, a template motion estimation unit 170, an adaptive motion compensation unit 180, and an intra prediction unit 190.
  • a prediction process may be performed for the input image by the intra prediction unit 190 via the encoding control unit 110.
  • a predicted image signal may be transformed and be quantized by the transformation and quantization unit 120 and be output via the entropy encoding unit 130.
  • the image signal may be stored in the reference image storage unit 160 via the inverse-transformation and inverse-quantization unit 140 and the de-blocking unit 150, and be used for a prediction process of a subsequent frame.
  • the template motion estimation unit 170 may verify a template, estimate a motion between the input image and a reference image stored in the reference image storage unit 160, using the template, and provide motion estimation information using the template to the adaptive motion compensation unit 180.
  • the motion estimation information using the template denotes information associated with the estimated motion of the image by searching for the reference image in a most similar region to a template region that is pre-set in the input image.
  • the template will be described with reference to FIG. 2.
  • FIG. 2 is a diagram illustrating a configuration of a template with respect to a current macro block 200 in an encoding and decoding apparatus according to an embodiment of the present invention.
  • the encoding and decoding apparatus may include a left macro block 212, an upper-left macro block 214, an upper macro block 216, and an upper-right macro block 218 based on the current macro block 200.
  • the adaptive motion compensation unit 180 may generate a predicted image using motion estimation information and a reference image stored in the reference image storage unit 160, calculate a filter coefficient with respect to the predicated image using a template, and filter the predicted image using the filter coefficient.
  • the adaptive motion compensation unit 180 will be described in detail with reference to FIG. 3.
  • FIG. 3 is a block diagram illustrating a configuration of the adaptive motion compensation unit 180 in an encoding and decoding apparatus according to an embodiment of the present invention.
  • the adaptive motion compensation unit 180 may include a motion compensation unit 310, a motion compensation filter coefficient calculation unit 320, and a filtering unit 330.
  • the motion compensation unit 310 may generate a predicted image using motion estimation information and a reference image stored in the reference image storage unit 160 of FIG. 1, and may provide the predicted mage to the motion compensation filter coefficient calculation unit 320.
  • the motion compensation filter coefficient calculation unit 320 may calculate a filter coefficient with respect to the predicted image, using a template based on a current macro block.
  • the calculation scheme may include, for example, a least square estimation scheme as given by the following Equation 1:
  • B indicates a current macro block as a matrix
  • H indicates a convolution kernel of a filter as the matrix
  • T i denotes a macro block of a reference image corresponding to a macro block of an input image.
  • the motion compensation filter coefficient may be calculated by obtaining H that may minimize the above Equation 1.
  • the filtering unit 330 may filter the predicted image using the calculated motion compensation filter coefficient.
  • the transformation and quantization unit 120 may receive a differential image that is a difference between the input image and the filtered predicted image, perform an integer-transformation and quantization for the differential image, and provide the quantized differential image to the entropy encoding unit 130 and the inverse-transformation and inverse-quantization unit 140.
  • the entropy encoding unit 130 may entropy encode the quantized differential image to output an image stream.
  • the inverse-transformation and inverse-quantization unit 140 may recover the differential image by performing inverse-transformation and inverse-quantization for the quantized differential image.
  • the reference image storage unit 160 may store the reference image that is generated by adding the differential image and the input image.
  • FIG. 4 is a block diagram illustrating a configuration of a decoding apparatus according to an embodiment of the present invention.
  • the decoding apparatus may include an entropy decoding unit 410, an inverse-transformation and inverse-quantization unit 420, a de-blocking filter 430, a reference image storage unit 440, a template motion estimation unit 450, and an adaptive motion compensation unit 460.
  • the entropy decoding unit 410 may entropy decode an input image stream.
  • the inverse-transformation and inverse-quantization unit 420 may perform inverse-quantization and inverse-transformation for the decoded input image stream to recover a differential image.
  • the de-blocking filter 430 denotes a filter that may smooth a boundary error of a block occurring in block-based coding.
  • the de-blocking unit 430 may de-blocking filter an image where a predicted image and the differential image are added and may generate an output image.
  • the reference image storage unit 440 may store the output image as a reference image for a subsequent predicted image.
  • the template motion estimation unit 450 may verify a template, estimate a motion between recent reference images stored in the reference image storage unit 440, using the template, and provide motion estimation information using the template to the adaptive motion compensation unit 460.
  • the adaptive motion compensation unit 460 may generate the predicted image using motion estimation information and a reference image stored in the reference image storage unit 440, calculate a filter coefficient with respect to the predicted image using the template, and filter the predicted image using the filter coefficient.
  • a detailed configuration of the adaptive motion compensation unit 460 will be the same as the configuration of FIG. 3 and thus further detailed description related thereto will be omitted here.
  • FIG. 5 is a flowchart illustrating a method of encoding an image in an encoding apparatus according to an embodiment of the present invention.
  • the encoding apparatus may verify a template and estimate a motion of the template using the input image and a reference image in operation 502.
  • the encoding apparatus may generate a predicted image using motion estimation information using the template and the reference image.
  • the encoding apparatus may calculate a filter coefficient with respect to the predicted image using the template.
  • the encoding apparatus may filter the predicted image using the filter coefficient.
  • the encoding apparatus may calculate a difference between a current input image and the filtered predicted image to generate a differential image.
  • the encoding apparatus may perform integer-transformation and quantization for the differential image.
  • the encoding apparatus may entropy encode the quantized differential image to output an image stream.
  • the encoding apparatus may perform inverse-transformation and inverse-quantization for the quantized differential image to recover the differential image in operation 516.
  • the encoding apparatus may generate a reference image for a subsequent motion prediction and compensation by adding the differential image and the current input image and may store the generated reference image.
  • FIG. 6 is a flowchart illustrating a method of decoding an image stream in a decoding apparatus according to an embodiment of the present invention.
  • the decoding apparatus may entropy decode the input image stream in operation 602.
  • the decoding apparatus may perform inverse-quantization and inverse-transformation for the decoded input image stream to recover a differential image.
  • the decoding apparatus may de-blocking filter an image where a predicted image and the differential image are added, to generate an output image and may output the output image.
  • the decoding apparatus may store the output image as a reference image.
  • the decoding apparatus may verify a template and estimate a motion using the template based on recent reference images.
  • the decoding apparatus may generate a predicted image for a subsequent decoding process using the motion estimation information using the template and the reference image.
  • the decoding apparatus may calculate a filtering coefficient with respect to the predicted image using the template.
  • the decoding apparatus may filter the predicted image using the filter coefficient.
  • the exemplary embodiments of the present invention include computer-readable media including program instructions to implement various operations embodied by a computer.
  • the media may also include, alone or in combination with the program instructions, data files, data structures, tables, and the like.
  • the described hardware devices may be configured to act as one or more software modules in order to perform the operations of the above-described embodiments of the present invention, or vice versa.

Abstract

La présente invention concerne un appareil et un procédé de codage et de décodage d'un signal vidéo. Un appareil de codage de signal vidéo peut comprendre : une unité de stockage d'images de référence destinée à stocker une image de référence; une unité d'estimation de mouvement modèle destinée à estimer un mouvement entre une image d'entrée et l'image de référence à l'aide du modèle et à générer une information d'estimation de mouvement; une unité de compensation de mouvement adaptative permettant de générer une image prédite à l'aide de l'information d'estimation de mouvement et de l'image de référence, afin de calculer un coefficient de filtre à l'égard de l'image prédite utilisant le modèle, et afin de filtrer l'image prédite à l'aide du coefficient de filtre; une unité de quantification et de transformation permettant d'effectuer une transformation et une quantification de nombres entiers pour une image différentielle qui est une différence entre l'image d'entrée et l'image prédite filtrée; une unité de codage entropique permettant d'effectuer un codage entropique de l'image différentielle quantifiée et de délivrer un flux d'image.
PCT/KR2009/004576 2008-11-24 2009-08-17 Appareil et procédé de codage/décodage d'un signal vidéo WO2010058895A2 (fr)

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