KR20120138430A - Apparatus and method of encoding and decoding for hierarchicalintra prediction - Google Patents

Apparatus and method of encoding and decoding for hierarchicalintra prediction Download PDF

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KR20120138430A
KR20120138430A KR1020110057904A KR20110057904A KR20120138430A KR 20120138430 A KR20120138430 A KR 20120138430A KR 1020110057904 A KR1020110057904 A KR 1020110057904A KR 20110057904 A KR20110057904 A KR 20110057904A KR 20120138430 A KR20120138430 A KR 20120138430A
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South Korea
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prediction mode
intra prediction
group
decoding
mode
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KR1020110057904A
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Korean (ko)
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심동규
남정학
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광운대학교 산학협력단
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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
    • H04N19/105—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
    • H04N19/124—Quantisation
    • 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
    • H04N19/13—Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
    • 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
    • H04N19/30—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability

Abstract

The present invention relates to a method and apparatus for hierarchically encoding an intra prediction mode in an image encoding / decoding apparatus. A method and apparatus for encoding a hierarchical intra prediction mode divides a given prediction mode into a predetermined group, and performs entropy decoding for the group and the actual prediction mode with an adaptive number of bits according to the mode of the neighboring block.

Description

Apparatus and Method of encoding and decoding for hierarchicalintra prediction}

The present invention relates to an image encoding / decoding apparatus and method, and more particularly, to an image encoding / decoding apparatus and method for hierarchically encoding an intra prediction mode.

Next-generation high efficiency video coding (HEVC), which is currently being standardized with H.264 / AVC, includes an intra picture coding method. In H.264 / AVC, there are 4x4, 8x8, and 16x16 block size prediction methods for luminance images, and 9, 9, and 4 prediction modes are used according to the block size. The next generation of high-efficiency video compression standards also use variable prediction modes depending on the block size. In H.264 / AVC and next-generation video compression standards, the prediction of the current intra prediction mode is performed by using the most probable mode (MPM) when the intra prediction mode is encoded. If the highest probability prediction mode and the current intra prediction mode are the same, only one bit of flag is transmitted.If the highest probability prediction mode and the current intra prediction mode are different, in addition to the one bit flag, the actual intra prediction for the current block is performed. Send the mode. At this time, the actual intra prediction mode is represented by fixed bits according to the number of modes. For example, in-picture prediction mode for a 4x4 block of H.264 / AVC using nine modes is one bit flag sent if it matches the highest probability prediction mode, and if it is different from the highest probability prediction mode. One bit of flag and three bits of actual intra prediction mode information are transmitted. In the next-generation video compression standard using 35 modes, in-picture prediction mode transmits one bit of the flag if it matches the highest probability prediction mode, one bit of the flag and five bits if it differs from the highest probability prediction mode. Six bits of actual intra prediction mode information are transmitted.

However, if the intra prediction mode does not match the highest probability prediction mode, a high bit amount is required for the actual intra prediction mode because fixed bits are used. In particular, since the number of intra prediction modes is greatly increased in the next generation video encoding compression, the transmission of the actual intra prediction modes using fixed bits causes a decrease in performance. Accordingly, there is a need for an efficient encoding technique for encoding an intra prediction mode.

An object of the present invention is to provide a method and apparatus for hierarchically encoding an intra picture mode by grouping a mode of a neighboring block and a given intra picture prediction mode.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

In accordance with another aspect of the present invention, an image encoding apparatus includes an entropy decoder, an inverse quantization and inverse transform decoder, an intra prediction mode derivation unit, an intra prediction decoding unit, an inter prediction prediction decoder, and a reconstructed image storage. Contains wealth.

The hierarchical intra picture prediction encoding method and apparatus according to an embodiment of the present invention provide an efficient intra picture mode compression method in encoding and decoding an intra picture prediction mode. Through efficient in-screen mode transmission, the overall video compression performance can be improved.

1 is related to an image decoding method and apparatus having a hierarchical intra prediction mode.
FIG. 2 relates to a method and an apparatus for deriving an intra prediction mode in the image decoding apparatus of FIG. 1.
3 is a diagram illustrating a decoding method and apparatus for the highest probability prediction mode prediction step of FIG. 2.
4 is a diagram illustrating a decoding method and apparatus for intra prediction picture decoding of a current block of FIG. 3.
5 illustrates a direction of an intra prediction mode and a group of an intra prediction mode.
6 describes a direction of an intra prediction mode and a group of an intra prediction mode.
7 illustrates a decoding process of FIG. 6.

Hereinafter, a hierarchical intra prediction mode encoding method and apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings.

1 illustrates a method and an apparatus for decoding an image having a hierarchical intra prediction mode according to a first embodiment of the present invention. Referring to FIG. 1, an image decoding method and apparatus having a hierarchical intra prediction mode include an entropy decoder 100, an inverse quantization and inverse transform decoder 110, an intra prediction mode derivation unit 120, and an intra prediction prediction decoding. The unit 130 includes an inter prediction predictor 140 and a reconstructed image storage 150.

The entropy decoder 100 decodes the bitstream that is input. The inverse quantization and inverse transform encoder 110 performs inverse quantization and inverse transform encoding on the decoded transform coding coefficients. According to the video compression technology, various inverse quantization methods and inverse transform encoding methods can be used. The intra prediction mode derivation unit 120 obtains the intra prediction mode in a hierarchical structure proposed by the present invention. The intra prediction decoder 130 decodes a block encoded by intra prediction using the intra prediction mode obtained by the intra prediction mode derivation unit. The inter prediction decoder 140 performs decoding on a block encoded by inter prediction based on information such as a motion vector, a reference image index, and a difference signal obtained by an entropy decoder.

2 is a diagram illustrating a method and an apparatus for deriving an intra prediction mode in the image decoding apparatus of FIG. 1 according to a first embodiment of the present invention. Referring to FIG. 2, a decoding method and apparatus for deriving a hierarchical intra prediction mode include performing a most probable mode (MPM) prediction step 200, a group prediction step 210, and a mode derivation step 220. Include.

The highest probability prediction mode prediction step 200 identifies the intra prediction mode of the current block as the intra prediction mode of the neighboring block. The neighboring block may be selectively used among blocks adjacent to the left side of the current block or blocks adjacent to the upper side. Information on whether the highest probability prediction mode and the intra prediction mode of the current block are the same or different may be transmitted using a flag bit of one bit. When the highest probability prediction mode and the intra prediction mode of the current block are the same, the intra prediction mode of the current block is derived as the highest probability prediction mode. When a plurality of highest probability prediction modes are used, an additional flag is used to derive the current intra prediction mode. If the highest probability prediction mode and the intra prediction mode of the current block are different, the group prediction for the intra prediction mode of the current block is additionally performed. In the group prediction step 210, information about whether the current intra prediction mode is the same as or different from the group to which the intra prediction mode of the neighboring block belongs. The number of groups for the intra prediction mode may be adaptively changed according to the number of groups for the prediction mode in the entire screen, and the number of modes belonging to a group may also be adaptively changed. If there are multiple groups of modes, it may be transmitted to which group the current prediction mode belongs to using an additional flag. When the intra prediction mode group of the neighboring block is different from the intra prediction mode group of the current block, group information about the current block may be transmitted. In the mode derivation step 220, a mode is derived by using intra mode information on the current block. The intra prediction mode of the received current block is transmitted with an adaptive bit length according to the number of modes belonging to the current group.

FIG. 3A illustrates a decoding method and apparatus for predicting the highest probability prediction mode of FIG. 2 in an image decoding apparatus according to a first embodiment of the present invention. In the highest probability prediction mode prediction step, the highest probability prediction mode flag is decoded (300), and it is determined whether the intra prediction mode and the highest probability prediction mode of the current block are the same according to the flag value (310). If the intra prediction mode and the highest probability prediction mode of the current block are different, the intra prediction mode for the current block is decoded (320). If the intra prediction mode and the highest probability prediction mode of the current block are the same, the intra prediction mode of the current block is derived using the neighboring block. If the intra prediction mode and the highest probability prediction mode of the current block are different, the decoded signal is decoded. An intra prediction mode is derived 330 using the intra prediction mode.

3B is a diagram illustrating a decoding method and apparatus for predicting the highest probability prediction mode of FIG. 2 in an image decoding apparatus according to a second embodiment of the present invention. In the highest probability prediction mode prediction step, the highest probability prediction mode flag is decoded (300), and it is determined whether the intra prediction mode and the highest probability prediction mode of the current block are the same according to the flag value (310). If the intra prediction mode and the highest probability prediction mode of the current block are different, the intra prediction mode for the current block is encoded (320). When the intra prediction mode and the highest probability prediction mode of the current block are the same, a flag for the highest probability prediction mode direction may be additionally transmitted 340. If the intra prediction mode and the highest probability prediction mode of the current block are the same, the intra prediction mode of the current block is derived according to the intra prediction mode and the highest prediction mode direction flag of the neighboring block. If the highest probability prediction mode is different, the intra prediction mode is derived using the decoded intra prediction mode (330).

FIG. 4A illustrates a decoding method and apparatus for intra prediction picture decoding of a current block of FIG. 3A in an image decoding apparatus according to a first embodiment of the present invention. In intra prediction mode decoding of the current block, the group flag is decoded 400, and according to the flag value, it is determined whether the group to which the intra prediction mode of the current block belongs is the same as the group to which the mode of the neighboring block belongs. If the group belonging to the intra prediction mode of the current block is different from the group of the neighboring block, the index of the group to which the current block belongs is decoded (420). The index of a group may be transmitted with an adaptive number of bits according to the number of remaining groups. If the group of the current block is the same as the group of neighboring blocks, the index for the intra prediction mode of the current block in the group is decoded (430). The intra prediction mode of the current block may be transmitted with an adaptive number of bits according to the number of modes belonging to the current group. The intra prediction mode of the current block is decoded using the decoded group flag or group index and the index within the decoded group.

4B is a diagram illustrating a decoding method and apparatus for intra prediction picture decoding of a current block of FIG. 3A in an image decoding apparatus according to a first embodiment of the present invention. In intra prediction mode decoding of the current block, the group flag is decoded 400, and according to the flag value, it is determined whether the group to which the intra prediction mode of the current block belongs is the same as the group to which the mode of the neighboring block belongs. If the group belonging to the intra prediction mode of the current block is different from the group of the neighboring block, the index of the group to which the current block belongs is decoded (420). The index of a group may be transmitted with an adaptive number of bits according to the number of remaining groups. If the group of the current block and the neighboring block is the same, a flag is decoded as to whether the group to which the intra prediction mode of the current block belongs is the same as the left block or the upper block (450). The index for the intra prediction mode of the current block in the group is decoded (430). The intra prediction mode of the current block may be transmitted with an adaptive number of bits according to the number of modes belonging to the current group. The intra prediction mode of the current block is decoded using the decoded group flag or group index and the decoded group index.

5 is a diagram illustrating a direction of an intra prediction mode and a group of an intra prediction mode according to a first embodiment of the present invention. The current block 510 should be encoded and decoded using the brightness values of the neighboring block 500 which have already been restored. The intra prediction mode of the current block may have a variable number according to the size of the current block. The number of groups for the intra prediction mode of the current block may be divided into N variable according to the number of intra prediction modes.

6 illustrates a direction of an intra prediction mode and a group of an intra prediction mode according to a second embodiment of the present invention. Referring to FIG. 6, the current block 600 to be encoded and decoded is encoded and decoded by using brightness values of neighboring blocks that are already reconstructed, and may have 33 intra prediction directions. In-plane prediction and in-plane prediction may be additionally included. For the above embodiment, the intra prediction mode may be configured into nine groups, and the type of the included mode and the number of groups may be variably changed. The prediction in the DC picture and the prediction mode in the plane picture may be included in Group 1, Group 5, or Group 9. In this embodiment, three bits may be decoded for the group index, and two bits may be decoded for the index for the mode in the group.

7 illustrates a decoding process of FIG. 6 according to a first embodiment of the present invention. According to the decoding process of FIG. 7, it is determined whether the intra prediction mode for the current block is the same as the highest probability prediction mode (700). If the intra prediction mode of the current block is the same as the highest probability mode, it is determined whether the mode matches the mode of the left block or the mode of the upper block (701). When the intra prediction mode of the current block is the same as the highest probability mode, the intra prediction mode of the current block may be derived by 2-bit decoding. If the intra prediction mode of the current block is different from the highest probability mode, it is determined whether the group to which the intra prediction mode of the left neighboring block belongs to the group to which the intra prediction mode of the upper neighboring block belongs is the same. When the group to which the intra prediction mode of the left neighboring block belongs and the group to which the intra prediction mode of the upper neighboring block belongs are the same, it is determined whether the intra prediction mode of the current block belongs to the group of the neighboring block (703). If the intra prediction mode of the current block belongs to a group of neighboring blocks, it is determined whether the mode corresponding to the small mode among the modes belonging to the group matches (704). When the neighboring blocks have the same group and the intra prediction mode of the current block belongs to the group, the intra prediction mode can be derived by decoding of 3 bits. If the intra prediction mode of the current block is different from the group of the neighboring block, the index for the group is decoded, and the index for the mode belonging to the group is decoded. When the neighboring blocks have the same group, but the intra prediction mode of the current block is different from the group of the neighboring blocks, it is possible to derive the intra prediction mode by decoding 7 bits. If the group to which the intra prediction mode of the left neighboring block belongs and the group to which the intra prediction mode of the upper neighboring block belongs are different, it is determined whether the intra prediction mode of the current block belongs to the group of neighboring blocks (705). If the intra prediction mode of the current block belongs to the group of neighboring blocks, it is determined whether the group belongs to the group of the left block or the group of the upper block (706). If the intra prediction mode of the current block is the same as the intra prediction mode of the left block, it is determined whether the same mode is one of the modes belonging to the group (707). According to an embodiment, it may be determined whether the mode of the group is the same as the mode having the intermediate value of the mode number. In the case of one particular mode, an intra prediction mode may be derived through decoding of 4 bits. If it is different from one particular mode, the intra prediction mode may be derived through 5-bit decoding. If the intra prediction mode of the current block is the same as the intra prediction mode of the upper block, it is determined whether the same mode is one of the modes belonging to the group (708). According to an embodiment, it may be determined whether the mode of the group is the same as the mode having the intermediate value of the mode number. In the case of one particular mode, an intra prediction mode may be derived through decoding of 4 bits. If it is different from one particular mode, the intra prediction mode may be derived through 5-bit decoding. If the intra prediction mode of the current block does not belong to the group of neighboring blocks, the index for the group is decoded, and the index for the mode belonging to the group is decoded. When the group of neighboring blocks is different and the intra prediction mode of the current block is different from the group of the neighboring block, it is possible to derive the intra prediction mode by decoding 7 bits.

None

Claims (14)

In the apparatus and method for decoding an image,
An entropy decoding unit for decoding the input bitstream, an inverse quantization and inverse transform decoding unit for the decoded difference coefficients, an intra prediction mode deriving unit for decoding the intra prediction mode in a hierarchical structure, and an image reconstruction by intra prediction And an intra prediction predictor, an inter prediction predictor for reconstructing an image by inter prediction, and a reconstructed image storage for storing the reconstructed image. The apparatus and method of claim 1, wherein the entropy decoder comprises an intra prediction mode derivator. The image decoding apparatus of claim 1, wherein the intra prediction decoder comprises an intra prediction mode derivation unit. The method of claim 1, wherein the intra prediction mode derivation unit
An image decoding apparatus and method comprising a prediction step, a group prediction step, a mode derivation step of the highest probability prediction mode 5. The method of claim 4, wherein the predicting step of the highest probability prediction mode is
An image decoding apparatus and method using an intra prediction mode of a neighboring block as the highest probability prediction mode 5. The method of claim 4, wherein the predicting step of the highest probability prediction mode is
A video decoding apparatus and method for decoding a flag for determining whether a highest probability prediction mode and a prediction mode of a current block are the same The method of claim 4, wherein the predicting step of the highest probability prediction mode is
An apparatus and method for decoding an image comprising deriving an intra prediction mode of a current block as a highest probability prediction mode by using a highest probability prediction mode flag The method of claim 4, wherein the group prediction step
Image decoding apparatus and method characterized in that the classification into a variable group according to the block size for encoding the intra prediction mode The method of claim 4, wherein the group prediction step
An apparatus and method for decoding an image comprising decoding a flag for determining whether an intra prediction group of a neighboring block is equal to an intra prediction group of the current block The method of claim 4, wherein the group prediction step
An apparatus and method for decoding an image comprising decoding a flag for determining in which direction an intra prediction group of a neighboring block, such as a current block, is equal to a group The method of claim 4, wherein the group prediction step
And a method of decoding an image according to the group prediction flag The method of claim 4, wherein the mode derivation step is
An image decoding apparatus and method for decoding a flag for determining whether an intra prediction mode of a current block in a group is the same as a specific mode in a group The method of claim 4, wherein the mode derivation step is
An image decoding apparatus and method for decoding an index for an intra prediction mode of a current block in a group The method of claim 4, wherein the mode derivation step is
An apparatus and method for decoding an image characterized by decoding an adaptive number of bits for an index into an intra prediction mode of a current block according to the number of modes existing in a group

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220272368A1 (en) * 2017-12-07 2022-08-25 Electronics And Telecommunications Research Institute Method and apparatus for encoding and decoding using selective information sharing between channels

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220272368A1 (en) * 2017-12-07 2022-08-25 Electronics And Telecommunications Research Institute Method and apparatus for encoding and decoding using selective information sharing between channels
US11902553B2 (en) * 2017-12-07 2024-02-13 Electronics And Telecommunications Research Institute Method and apparatus for encoding and decoding using selective information sharing between channels

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