WO2012128211A1 - Dispositif de codage d'images, dispositif de décodage d'images, programme et données codées - Google Patents

Dispositif de codage d'images, dispositif de décodage d'images, programme et données codées Download PDF

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Publication number
WO2012128211A1
WO2012128211A1 PCT/JP2012/056875 JP2012056875W WO2012128211A1 WO 2012128211 A1 WO2012128211 A1 WO 2012128211A1 JP 2012056875 W JP2012056875 W JP 2012056875W WO 2012128211 A1 WO2012128211 A1 WO 2012128211A1
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block
prediction
prediction mode
image
encoding
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PCT/JP2012/056875
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English (en)
Japanese (ja)
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純生 佐藤
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シャープ株式会社
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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
    • H04N19/10—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
    • H04N19/11—Selection of coding mode or of prediction mode among a plurality of spatial predictive coding modes
    • 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
    • H04N19/597—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding specially adapted for multi-view video sequence encoding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2213/00—Details of stereoscopic systems
    • H04N2213/003—Aspects relating to the "2D+depth" image format

Definitions

  • the present invention relates to an image encoding device, an image decoding device, a program, and encoded data.
  • This application claims priority based on Japanese Patent Application No. 2011-060980 filed in Japan on March 18, 2011, the contents of which are incorporated herein by reference.
  • a texture image that is a general two-dimensional image that represents the subject space with the color of each subject and the background, and an image that represents the subject space with the distance from the viewpoint to each subject and the background.
  • There is a method of recording in association with two types of image data hereinafter referred to as “distance image”).
  • a distance image is an image that expresses a distance value (depth value) from a viewpoint to a corresponding point in a subject space for each pixel.
  • This distance image can be acquired, for example, by a distance measuring device such as a depth camera installed in the vicinity of the camera that records the texture image.
  • a distance image can be acquired by analyzing a plurality of texture images obtained by photographing with a multi-viewpoint camera, and many analysis methods have been proposed.
  • distance values are expressed in 256 levels (8-bit luminance values) in the Moving Picture Experts Group (MPEG), which is a working group of the International Organization for Standardization / International Electrotechnical Commission (ISO / IEC).
  • MPEG Moving Picture Experts Group
  • ISO / IEC International Electrotechnical Commission
  • the standard MPEG-C part3 is defined, and a standard distance image is an 8-bit grayscale image.
  • a subject located in front is expressed as white and a subject located in the back is expressed in black.
  • a single pixel value tends to appear in a wider area than the texture image. For example, even if a person wearing a fancy pattern is drawn on the texture image, the distance value of the clothes portion is almost constant in the distance image.
  • the distance from the viewpoint of each pixel constituting the subject image drawn in the texture image is known from the distance image, so that the subject has the maximum depth. It can be restored as a three-dimensional shape expressed in 256 stages. Furthermore, by projecting the 3D shape onto the 2D plane geometrically, the original texture image is converted into a texture image in the subject space when the subject is photographed from another angle within a certain range from the original angle. It is possible to convert. That is, since a 3D shape can be restored when viewed from an arbitrary angle within a certain range by a set of texture images and distance images, a free viewpoint image of 3D shapes can be obtained by using multiple sets of texture images and distance images. Can be expressed with a small amount of data.
  • H. As in the case of H.264, a technique for compressing and encoding video by efficiently eliminating temporal or spatial redundancy in the video is known (for example, Non-Patent Document 1).
  • a technique for compressing and encoding video by efficiently eliminating temporal or spatial redundancy in the video is known (for example, Non-Patent Document 1).
  • the redundancy that each video has Can be eliminated, and the data amount of each video transmitted to the decoding device can be further reduced.
  • In-screen predictive encoding is a group of pixels included in an encoded block around an encoding target block when one image to be encoded is divided into square blocks and encoded in, for example, raster scan order. To predict the encoding target block in advance. By performing orthogonal transform on the difference signal obtained by subtracting the prediction block from the encoding target block, the energy of the frequency spectrum after the orthogonal conversion is concentrated in the low-order region compared to the case where the encoding target block is directly orthogonally converted. Therefore, information can be efficiently compressed.
  • This intra prediction encoding can be performed on the luminance signal in units of 4 ⁇ 4 pixel sub-blocks or 16 ⁇ 16 pixel macroblocks.
  • FIG. 19 and 20 are diagrams schematically showing nine types of prediction modes for sub-blocks. Prediction is performed for the 4 ⁇ 4 pixel encoding target sub-block B1 shown in FIG. 19 using the surrounding pixels A to M.
  • FIG. 20 shows the direction in which these pixels are used. For example, in the case of mode 1, since the copying direction is the horizontal direction from left to right, the pixels I, J, K, and L are directed to the right. A block in which copying is repeated becomes a prediction block.
  • Mode 2 is called a DC mode, in which a prediction block is created not by copying a pixel group in a specified direction but by an average value of eight pixels A to D and I to L.
  • modes 3 to 8 as shown in FIG. 20, a block in which copying is repeated in the direction of the arrow becomes a prediction block.
  • FIG. 21 and FIG. 22 are diagrams that similarly represent the four types of prediction modes for macroblocks.
  • the encoding target macroblock is predicted using the surrounding pixels 00 to 0F and 10 to 1F.
  • the Plane mode a prediction block is obtained by interpolating between pixel groups so that they are smoothly connected.
  • the four types of prediction modes for color difference signals are the prediction modes having the same contents except for the number of surrounding pixel groups.
  • the prediction mode of the prediction mode of the encoding target block is set as the prediction value of the prediction mode of the encoding target block among the prediction modes of the blocks adjacent to the left and above the encoding target block.
  • the compression rate is further improved by omitting the encoding of the prediction mode number.
  • the group of the same depth value is generally much larger than the group of the same depth value of the texture image.
  • the distance image it is rare that the distance depth value changes abruptly in units of pixels other than the contour portion of the subject. That is, the probability that adjacent blocks have the same depth value is very high. From these features, the correlation between blocks over a wide range is high, and in particular, there is a high probability that the same depth value is continuous. Furthermore, since the contour of the subject is continuous as long as it does not overlap with other subjects, the correlation between the prediction directions in the screen is high between the blocks along one contour line. In addition, distance images tend to have a simpler screen structure than texture images, so not only sub-blocks but also the correlation between blocks in large units such as macroblocks can be expected to be very high. .
  • the above-described intra-screen prediction method includes a mode that is not so effective for the distance image, such as DC prediction and Plane prediction. Waste occurs. This is because, as described above, the distance image has a high probability that the same depth value continues in a block over a wide range, but in the DC prediction and the Plane prediction, an intermediate value of the actual depth value is created. This is because it is not suitable for accurate prediction in a distance image.
  • the correlation is high with respect to the prediction direction with the adjacent block, since the bit cannot be omitted unless the correlation is the same, the correlation is not fully utilized.
  • the macroblock since there are only four types of macroblocks, and there are only two types other than the DC mode and the Plane mode, the macroblock is not suitable for a simple image such as a distance image. There is a problem.
  • the present invention has been made in view of such circumstances, and is supplied from an image encoding device capable of reducing the amount of code of encoded data of a distance image as compared with the conventional image encoding device.
  • An object of the present invention is to provide a decoding device that decodes a distance image from encoded data.
  • a selection unit that selects a prediction mode to be applied to each block of a distance image from prediction modes, and a plurality of depth values in adjacent encoded blocks
  • a first determination unit that determines whether or not to include a block that is determined to include a plurality of depth values by the first determination unit, and has a prediction mode corresponding to a direction toward the encoding target block
  • a second determination unit that determines whether or not the prediction unit has a prediction value that is the same as the prediction mode of the block determined to be possessed by the second determination unit;
  • an encoding unit that encodes and transmits the encoding target block using the prediction value of the prediction mode.
  • the plurality of adjacent encoded blocks are adjacent to the top and the left, and if the predicted value cannot be obtained from any of them, the block is diagonally left It is good also as a block which adjoins the upper and diagonally upper right.
  • the prediction mode may consist only of prediction modes corresponding to eight directions.
  • the prediction mode corresponding to the intermediate direction of each predicted direction is set as the predicted value. Also good.
  • the selected one mode when the selected one mode is encoded, the selected one mode is determined by encoding the difference between the predicted value and the predicted direction. You may make it encode.
  • the encoding target block may be any of 4 ⁇ 4 pixels, 8 ⁇ 8 pixels, 16 ⁇ 16 pixels, or a combination thereof.
  • the second aspect of the present invention is the first determination for determining whether or not a plurality of adjacent decoded blocks include a plurality of depth values in each block of the distance image. And a second determination unit that determines whether or not the block determined to include a plurality of depth values by the first determination unit has a prediction mode corresponding to a direction toward the block, The prediction unit which uses the same prediction mode as the prediction mode of the block determined by the second determination unit as the prediction value of the prediction mode of the block, and the received encoding using the prediction value And a decoding unit that decodes a prediction mode of the block.
  • the computer of the image coding apparatus selects the prediction mode to be applied to each block of the distance image from the prediction modes, and the adjacent coded
  • a first determination unit that determines whether or not a block includes a plurality of depth values, and a direction in which a block that is determined to include a plurality of depth values by the first determination unit is directed to the encoding target block
  • a second determination unit that determines whether or not it has a prediction mode corresponding to the same, and a prediction mode of the block that is the same as the prediction mode of the block determined to have by the second determination unit
  • This is a program for functioning as an encoding unit that encodes and transmits the block to be encoded, using a prediction unit as a prediction value of the image and a prediction value of the prediction mode.
  • the computer of the image decoding apparatus determines whether a block includes a plurality of depth values for a plurality of adjacent decoded blocks for each block of a distance image.
  • a first determination unit that determines whether or not a block determined to include a plurality of depth values has a prediction mode corresponding to a direction toward the block.
  • a second determination unit a prediction unit that uses the same prediction mode of the block determined to be held by the second determination unit as a prediction value of the prediction mode of the block, and the prediction value
  • the fifth aspect of the present invention is encoded data of a distance image, and one mode is selected from prediction modes composed of only a plurality of prediction directions for each block of the image. Then, for a plurality of adjacent encoded blocks, it is determined whether or not the block includes a plurality of depth values, and the block determined to include a plurality of depth values corresponds to the direction toward the block. It is determined whether or not it has a prediction mode, and the same prediction mode as that of the block determined to have is set as the prediction value of the prediction mode of the block, and the prediction mode is encoded using the prediction value. Encoded data.
  • an encoding device capable of reducing the code amount of encoded data of a distance image and a decoding device that decodes a distance image from encoded data supplied from the encoding device are realized. The effect that it can be obtained.
  • FIG. 1 is a block diagram showing the configuration of the embodiment.
  • reference numeral 1 is a distance image D1 input
  • the input distance image is divided into blocks each having a predetermined number of pixels, encoded for each block, and encoded block data is transmitted via a transmission path.
  • Code 2 receives the encoded block data transmitted from the image encoding device via the transmission path, decodes the received encoded block data, restores the distance image, and outputs the restored distance image D2.
  • the image decoding apparatus receives the encoded block data transmitted from the image encoding device via the transmission path, decodes the received encoded block data, restores the distance image, and outputs the restored distance image D2.
  • the peripheral pixel group used for the intra prediction of the luminance signal sub-block is H.264. Like the H.264 standard, as shown in FIG. 2, there are 13 pixel groups A to M.
  • the peripheral pixel groups used for intra-screen prediction of the color difference signal block are 25 pixel groups A to Y as shown in FIG.
  • the peripheral pixel groups used for intra prediction of the macro block of the luminance signal are 49 pixel groups of 00 to 2F, 10 to 1F, and 30, as shown in FIG.
  • the prediction mode is prediction for eight directions of modes 0 to 7.
  • 6 to 13 are examples of the types of pixel copy formats. 6 to 13, the 16 ⁇ 16 pixel block located at the lower right is the encoding target block B, and the other blocks are the encoded adjacent blocks. 6 to 13, each grid in each block represents a pixel, and a line with an arrow represents a copy destination of the pixel.
  • the encoding target block B is created by copying the pixel in the bottom row of the encoded block adjacent thereto.
  • the encoding target block B all the pixel groups located in the n-th column from the left copy the n-th pixel from the left in the bottom row of the adjacent block above.
  • FIG. 14 shows one of the arrows in FIG. In this case, as shown in FIG. 15, the pixel shown in black is copied as the ninth pixel from the left in the bottom row of the adjacent block.
  • a prediction mode encoding method in the image encoding device 1 shown in FIG. 1 will be described.
  • H.264 is used.
  • prediction mode prediction is performed from adjacent blocks.
  • the prediction process is H.264. It is different from that of H.264 standard. The prediction processing operation will be described with reference to FIG.
  • the prediction mode of a block including a contour among encoded blocks adjacent to the upper and left sides of the encoding target block B is because the contour is often continuous from the block including the contour, and the direction changes along the contour, so that the amount of change from the adjacent block is often not large. Whether or not the contour is included is determined depending on whether the adjacent block includes a plurality of depth values. That is, when the adjacent block includes an outline, it always includes a plurality of depth values. Therefore, the adjacent block consisting of only a single depth value is not used for prediction mode prediction.
  • step S1 it is determined whether there is an encoded block including a plurality of depth values among the encoded blocks adjacent to the upper and left sides of the encoding target block B (step S1). As a result of this determination, if there is an encoded block including a plurality of depth values, it is determined whether or not the contour of a block that may include the contour in the block extends in the direction of the encoding target block B. Determine (step S2). Specifically, the block adjacent to the left is determined to exist when the prediction mode is any one of mode 1, mode 3, mode 4, mode 5, and mode 7. A block adjacent to the upper side is determined to exist when the prediction mode is any one of mode 0, mode 2, mode 3, mode 4, mode 5, and mode 6.
  • Step S3 the prediction value of the prediction mode is set to “none”, and the prediction mode number shown in FIG. 5 is encoded as it is (step S4).
  • the contour of the block that may include the contour in the block is encoded. It is determined whether or not it extends in the direction of the target block B (step S5). It is determined that a block adjacent on the upper left is present when the prediction mode is mode 3. It is determined that a block adjacent to the upper right is present when the prediction mode is 2 or mode 6.
  • step S6 if there is a corresponding block, whether or not the determined block is a block of both of the two blocks (upper and left, or upper left and upper right). Is determined (step S6).
  • step S7 the middle direction between the two prediction mode numbers is used as a reference (step S7).
  • the middle is not fixed in one direction, the smaller mode number is adopted.
  • step S8 the direction of the corresponding prediction mode is used as a reference.
  • the direction is set to 0, the next lower number is set to 1 and the larger number is set to 2, and then the reference direction is used as an axis. Assign a number to the outside. If there is no more number on the outside of either one, the numbers are sequentially assigned to the outside on the opposite side (see FIG. 17). Then, for example, an exponent Golomb codeword is assigned to each number as shown in FIG. In this method, when the prediction direction predicted from the adjacent block is almost the same as the prediction direction of the encoding target block B, the codeword length is shortened, so that the efficiency of information compression can be expected.
  • 4-bit fixed-length codewords b0, b1, b2, and b3 are prepared, and whether or not the prediction direction predicted from the adjacent block and the prediction direction of the encoding target block B are the same in b0. If these flags are different, the prediction mode number shown in FIG. 5 may be encoded using the 3 bits b1, b2, and b3 as they are.
  • H. In the H.264 standard 3 bit fixed-length codewords b0, b1, and b2 are prepared as in the prediction mode of the macro block for the luminance signal and the block for the color difference signal, and the 3 bits are used for all the blocks in FIG. The number of the prediction mode shown may be encoded as it is.
  • step S6 and S7 in FIG. 16 are omitted, and step S8 is substituted for them, and the process is either step S4 or step S8.
  • the processing operation of the image decoding device 2 shown in FIG. 1 will be described.
  • decoding is performed in block units in the order of encoding.
  • the prediction value was calculated by referring to the pixel group included in the encoded block.
  • the prediction value was calculated in the same manner with reference to the pixel group included in the decoded block. calculate. Since the encoded block on the encoding side and the block when the block is decoded on the decoding side are the same, the same predicted value as that on the encoding side is obtained on the decoding side.
  • the prediction mode can be restored using the prediction value in the image decoding apparatus 2.
  • the method described above can be applied to each of the sub-macroblock and macroblock for the luminance signal and the block for the color difference signal.
  • efficient intra prediction encoding can be performed on the distance image having the above-described features, and more efficient information compression can be performed.
  • the program for realizing the functions of the image encoding device and the image decoding device 2 in FIG. 1 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed. By doing so, the image encoding process and the image decoding process may be performed.
  • the “computer system” includes an OS and hardware such as peripheral devices.
  • the “computer system” includes a WWW system having a homepage providing environment (or display environment).
  • the “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM or a CD-ROM, and a hard disk incorporated in a computer system.
  • the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.
  • RAM volatile memory
  • the program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium.
  • the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
  • the program may be for realizing a part of the functions described above. Furthermore, what can implement

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Abstract

L'invention concerne un dispositif de codage d'images comprenant les éléments suivants : une unité de sélection dont le rôle est de sélectionner un mode de prévision à appliquer à chaque bloc d'une image de distance ; une première unité de détermination qui, pour chaque bloc adjacent déjà codé, se charge de déterminer si ledit bloc déjà codé contient ou non une pluralité de valeurs de profondeur ; une seconde unité de détermination qui, pour chaque bloc adjacent que la première unité de détermination a identifié comme contenant une pluralité de valeurs de profondeur, va déterminer si le mode de prévision pour ledit bloc correspond ou non au sens dans lequel se trouve un bloc-cible destiné à être codé ; une unité de prévision qui règle les valeurs prédites pour le bloc-cible sur des valeurs qui sont égales aux valeurs prédites pour les blocs dont les modes de prévision ont été déterminés par la seconde unité de détermination comme correspondant au sens dans lequel se trouve le bloc-cible ; et une unité de codage qui fait intervenir lesdites valeurs prédites pour coder le bloc-cible et qui transmet le résultat.
PCT/JP2012/056875 2011-03-18 2012-03-16 Dispositif de codage d'images, dispositif de décodage d'images, programme et données codées WO2012128211A1 (fr)

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JP2011060980A JP2014112749A (ja) 2011-03-18 2011-03-18 画像符号化装置および画像復号装置
JP2011-060980 2011-03-18

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008193530A (ja) * 2007-02-06 2008-08-21 Canon Inc 画像記録装置、画像記録方法、及びプログラム
WO2009089032A2 (fr) * 2008-01-10 2009-07-16 Thomson Licensing Procédés et appareil pour la compensation d'éclairage d'une vidéo intra-prédite
JP2009528587A (ja) * 2006-02-27 2009-08-06 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 出力画像のレンダリング
JP2010056701A (ja) * 2008-08-27 2010-03-11 Nippon Telegr & Teleph Corp <Ntt> 画面内予測符号化方法，画面内予測復号方法，これらの装置，およびそれらのプログラム並びにプログラムを記録した記録媒体

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009528587A (ja) * 2006-02-27 2009-08-06 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 出力画像のレンダリング
JP2008193530A (ja) * 2007-02-06 2008-08-21 Canon Inc 画像記録装置、画像記録方法、及びプログラム
WO2009089032A2 (fr) * 2008-01-10 2009-07-16 Thomson Licensing Procédés et appareil pour la compensation d'éclairage d'une vidéo intra-prédite
JP2010056701A (ja) * 2008-08-27 2010-03-11 Nippon Telegr & Teleph Corp <Ntt> 画面内予測符号化方法，画面内予測復号方法，これらの装置，およびそれらのプログラム並びにプログラムを記録した記録媒体

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