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CN113259674A - Method and apparatus for image or video encoding and decoding - Google Patents

Method and apparatus for image or video encoding and decoding Download PDF

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Publication number
CN113259674A
CN113259674A CN202010089125.1A CN202010089125A CN113259674A CN 113259674 A CN113259674 A CN 113259674A CN 202010089125 A CN202010089125 A CN 202010089125A CN 113259674 A CN113259674 A CN 113259674A
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coding block
mpm
intra
prediction mode
current
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CN202010089125.1A
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CN113259674B (en
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欧阳晓
朴银姬
周川
吕卓逸
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Beijing Samsung Telecommunications Technology Research Co Ltd
Samsung Electronics Co Ltd
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Beijing Samsung Telecommunications Technology Research Co Ltd
Samsung Electronics Co Ltd
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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
    • H04N19/169—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
    • H04N19/10—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
    • H04N19/159—Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction

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  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

Methods and apparatus for image/video coding are provided. The method for encoding includes: selecting a most probable mode MPM of intra-frame prediction according to the relative relation of the width and the height of a current coding block; when the intra-frame prediction mode of the current coding block is the same as one of the selected MPMs, writing the identifier of the intra-frame prediction mode, which is the same as the MPM, into the code stream, and marking the MPM; and transmitting the code stream. The method for decoding includes: receiving a code stream; selecting a most probable mode MPM of intra-frame prediction according to the relative relation of the width and the height of a current coding block; and when the intra-frame prediction mode information analyzed from the code stream indicates that the intra-frame prediction mode of the current coding block is the same as one of the selected MPMs, taking the same MPM as the intra-frame prediction mode of the current coding block.

Description

Method and apparatus for image or video encoding and decoding
Technical Field
The present invention relates to the field of image/video coding and decoding, and more particularly, to intra prediction in coding and decoding.
Background
In the conventional video or image encoding and decoding method, an image is usually divided into a plurality of image blocks, and then each image block is encoded or decoded. For each image block, the encoding step can be divided into prediction, transformation, quantization and entropy encoding, wherein the prediction is to predict the current image block to be encoded by using the reconstructed pixel values (these pixels are referred to as reference pixels) of the image block that has been encoded before to derive a predicted value, and then encode the difference between the actual value and the predicted value of the current image block into the code stream. During decoding, the decoder also needs to predict the current image block to be decoded by using the reconstructed pixel values (these pixels are referred to as reference pixels) of the image block that has been decoded before to derive a prediction value, and then add the difference value decoded from the code stream to the prediction value to obtain the reconstructed value of the decoded image block. In order to ensure the consistency of encoding and decoding, encoding and decoding codes must use the same reference pixels and the same prediction method when performing prediction. There are many specific prediction methods, and the encoder selects a current image block and then writes information about the selected prediction method into the code stream to tell the decoder, so that the decoder can predict the current decoded block using the same prediction method.
Disclosure of Invention
Technical problem
There is a need for improved techniques for intra prediction in image/video coding.
Solution scheme
There is provided a method for encoding, comprising: selecting a most probable mode MPM of intra-frame prediction according to the relative relation of the width and the height of a current coding block; when the intra-frame prediction mode of the current coding block is the same as one of the selected MPMs, writing the identifier of the intra-frame prediction mode, which is the same as the MPM, into the code stream, and marking the MPM; and transmitting the code stream.
There is provided an apparatus for encoding, comprising: a memory having stored therein a computer program, and a processor that, when running the computer program, performs the following operations: selecting a most probable mode MPM of intra-frame prediction according to the relative relation of the width and the height of a current coding block; when the intra-frame prediction mode of the current coding block is the same as one of the selected MPMs, writing the identifier of the intra-frame prediction mode, which is the same as the MPM, into the code stream, and marking the MPM; and transmitting the code stream.
There is provided an apparatus for encoding, comprising: the selecting unit is configured to select the MPM of the intra-frame prediction according to the width-height relative relation of the current coding block; a writing unit configured to write an identifier of the intra prediction mode being the same as the MPM in the code stream and mark the same MPM when the intra prediction mode of the current coding block is the same as one of the selected MPMs; and a transmitting unit configured to transmit the code stream.
The method for selecting the MPM of the intra-frame prediction according to the width-height relative relation of the current coding block comprises the following steps: when the aspect ratio of the current coding block is larger than a first threshold value, selecting at least one coding block from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the at least one coding block as MPM; or when the aspect ratio of the current coding block is larger than a second threshold value, selecting at least one coding block from the coding blocks on the left of the current coding block, and taking the intra-frame prediction mode of the at least one coding block as the MPM.
Selecting at least one coding block from coding blocks above a current coding block, wherein taking an intra prediction mode of the at least one coding block as MPM comprises the following steps: when the number N of the selected MPMs is 1, selecting 1 coding block from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the selected coding block as the MPM; or when the number N of the selected MPMs is more than or equal to 2, selecting N coding blocks at equal intervals by taking W/(N-1) as an interval from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the N coding blocks as the MPM, wherein W is the width of the current coding block.
Selecting at least one coding block from coding blocks on the left of a current coding block, wherein the MPM of the intra-frame prediction mode of the at least one coding block comprises the following steps: when the number N of the selected MPMs is 1, selecting 1 coding block from the coding block on the left of the current coding block, and taking the intra-frame prediction mode of the selected coding block as the MPM; or when the number N of the selected MPMs is more than or equal to 2, selecting N coding blocks at equal intervals by taking H/(N-1) as an interval from the coding blocks at the left of the current coding block, and taking the intra-frame prediction mode of the N coding blocks as the MPM, wherein H is the height of the current coding block.
A computer readable storage medium is provided for storing non-transitory computer readable instructions which, when executed by a computer, cause the computer to perform the method as previously described.
There is provided a method for decoding, comprising: receiving a code stream; selecting a most probable mode MPM of intra-frame prediction according to the relative relation of the width and the height of a current coding block; and when the intra-frame prediction mode information analyzed from the code stream indicates that the intra-frame prediction mode of the current coding block is the same as one of the selected MPMs, taking the same MPM as the intra-frame prediction mode of the current coding block.
There is provided an apparatus for decoding, comprising: a memory having stored therein a computer program, and a processor that, when running the computer program, performs the following operations: receiving a code stream; selecting a most probable mode MPM of intra-frame prediction according to the relative relation of the width and the height of a current coding block; and when the intra-frame prediction mode information analyzed from the code stream indicates that the intra-frame prediction mode of the current coding block is the same as one of the selected MPMs, taking the same MPM as the intra-frame prediction mode of the current coding block.
There is provided an apparatus for decoding, comprising: a receiving unit configured to receive a code stream; an analysis unit configured to analyze intra prediction mode information from the code stream; and a derivation unit configured to select a most probable mode MPM for intra prediction according to a height-width relative relationship of the current encoding block, and when the intra prediction mode information indicates that the intra prediction mode of the current encoding block is the same as one of the selected MPMs, take the same MPM as the intra prediction mode of the current encoding block.
The method for selecting the MPM of the intra-frame prediction according to the width-height relative relation of the current coding block comprises the following steps: when the aspect ratio of the current coding block is larger than a first threshold value, selecting at least one coding block from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the at least one coding block as MPM; or when the aspect ratio of the current coding block is larger than a second threshold value, selecting at least one coding block from the coding blocks on the left of the current coding block, and taking the intra-frame prediction mode of the at least one coding block as the MPM.
Selecting at least one coding block from coding blocks above a current coding block, wherein taking an intra prediction mode of the at least one coding block as MPM comprises the following steps: when the number N of the selected MPMs is 1, selecting 1 coding block from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the selected coding block as the MPM; or when the number N of the selected MPMs is more than or equal to 2, selecting N coding blocks at equal intervals by taking W/(N-1) as an interval from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the N coding blocks as the MPM, wherein W is the width of the current coding block.
Selecting at least one coding block from coding blocks on the left of a current coding block, wherein the MPM of the intra-frame prediction mode of the at least one coding block comprises the following steps: when the number N of the selected MPMs is 1, selecting 1 coding block from the coding block on the left of the current coding block, and taking the intra-frame prediction mode of the selected coding block as the MPM; or when the number N of the selected MPMs is more than or equal to 2, selecting N coding blocks at equal intervals by taking H/(N-1) as an interval from the coding blocks at the left of the current coding block, and taking the intra-frame prediction mode of the N coding blocks as the MPM, wherein H is the height of the current coding block.
A computer readable storage medium is provided for storing non-transitory computer readable instructions which, when executed by a computer, cause the computer to perform the method as previously described.
Advantageous effects
The present invention provides improved techniques for intra prediction in image/video coding. Other aspects, advantages and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention.
Drawings
Fig. 1 is a diagram illustrating an existing intra prediction mode and two MPMs.
Fig. 2 shows a flow chart of a method for image and/or video coding according to the invention.
Fig. 3 is a diagram illustrating a selection manner of an MPM when an aspect ratio of a current coding block is greater than a first threshold according to an embodiment of the present invention.
Fig. 4 is a diagram illustrating a selection manner of an MPM when an aspect ratio of a current coding block is greater than a second threshold according to an embodiment of the present invention.
Fig. 5 shows a block diagram of an apparatus for encoding according to the present invention.
Fig. 6 shows a flow chart of a method for image and/or video decoding according to the invention.
Fig. 7 shows an apparatus for image and/or video decoding according to the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The terms and words used in the following description are not intended to be limited to the literal meanings, but are merely used to enable a clear and consistent understanding of the invention. Accordingly, one skilled in the art would understand that: the following description of exemplary embodiments of the present invention is provided for the purpose of illustration only and not for the purpose of limiting the invention as defined by the claims and their equivalents.
It should be understood that: the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.
With the development of image and/or video coding and decoding technology, the prediction directions in the intra prediction technology are correspondingly increased, from the maximum 9 intra prediction modes in h.264, to 35 intra prediction modes in HEVC, and to 67 intra prediction modes in VVC at the present stage. With the increase of intra-frame prediction modes, researchers have found that the intra-frame prediction Mode of a current coding block has high similarity to the intra-frame prediction modes of neighboring blocks, and a Most Probable Mode (MPM) technique should be developed to remove redundancy between the intra-frame prediction modes of neighboring blocks. As shown in FIG. 1, the intra prediction mode of the current block is horizontal mode, and the intra prediction modes (i.e., MPMs) of two adjacent blocks of the current block are horizontal mode and horizontal up mode, so that the encoder only needs to tell the decoder that the intra prediction mode of the current block is consistent with the intra prediction mode of the left block, and does not need to spend a large number of bits to encode the intra prediction mode of the current block.
Fig. 1 is a diagram illustrating an existing intra prediction mode and two MPMs. With the development of image and/or video coding and decoding technology, especially after various partitioning methods with different sizes are adopted in the new generation coding technology, a coding block may have a non-square size, and when the aspect ratio of the coding block is relatively large, as shown in fig. 1, two MPMs may be the same, for which case, a more accurate MPM needs to be obtained to remove redundancy between intra prediction modes.
In order to make the MPMs selected under the condition of different partition sizes of the coding block as different as possible so as to achieve the effect of removing redundancy among intra-frame prediction modes, the invention improves the MPM selection method. When the aspect ratio of the current coding block is larger than a first threshold (for example, the first threshold is larger than or equal to 1), the encoder and/or the decoder selects at least one coding block from the coding blocks above the current coding block, and the intra-frame prediction mode of the at least one coding block is used as the MPM; when the aspect ratio of the current coding block is larger than a second threshold (for example, the second threshold is larger than or equal to 1), the encoder and/or the decoder selects at least one coding block from the coding blocks on the left side of the current coding block, and takes the intra prediction mode of the at least one coding block as the MPM. Therefore, for coding blocks with different sizes, more MPMs can be selected as much as possible to remove redundancy among the intra-frame prediction modes, and finally, the performance of image and/or video coding and decoding is improved.
Fig. 2 shows a flow chart of a method for image and/or video coding according to the invention. The method comprises the following steps: selecting MPMs for intra-frame prediction according to the relative relation of width and height of the current coding block (S201); when the intra-frame prediction mode of the current coding block is the same as one of the selected MPMs, writing the same identifier of the intra-frame prediction mode and the MPM in the code stream, and marking the same MPM (S202); and transmitting the codestream (S203).
According to the embodiment of the present invention, the selecting the MPM for intra prediction according to the aspect-to-height relative relationship of the current coding block in S201 includes: when the aspect ratio of the current coding block is larger than a first threshold (for example, the first threshold is larger than or equal to 1), selecting at least one coding block from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the at least one coding block as MPM; or when the aspect ratio of the current coding block is larger than a second threshold (for example, the second threshold is larger than or equal to 1), selecting at least one coding block from the coding blocks on the left of the current coding block, and taking the intra-frame prediction mode of the at least one coding block as the MPM. In this way, for coding blocks with different width-height relative relations, as many MPMs as possible can be selected for the coding blocks to remove redundancy between intra-prediction modes, and finally improve the performance of image and/or video coding and decoding.
Fig. 3 is a diagram illustrating a selection manner of an MPM when an aspect ratio of a current coding block is greater than a first threshold according to an embodiment of the present invention. Fig. 4 is a diagram illustrating a selection manner of an MPM when an aspect ratio of a current coding block is greater than a second threshold according to an embodiment of the present invention.
According to the embodiment of the invention, selecting at least one coding block from coding blocks above a current coding block, and taking an intra prediction mode of the at least one coding block as MPM comprises the following steps: when the number N of the selected MPMs is 1, selecting 1 coding block from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the selected coding block as the MPM; or when the number N of the selected MPMs is more than or equal to 2, selecting N coding blocks at equal intervals by taking W/(N-1) as an interval from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the N coding blocks as the MPM, wherein W is the width of the current coding block. For example, when N is 3, 3 MPMs are equidistantly selected from the top of the current coding block at an interval of W/(3-1) ═ W/2, as shown in fig. 3.
According to the embodiment of the invention, selecting at least one coding block from the coding blocks on the left of the current coding block, and taking the intra-frame prediction mode of the at least one coding block as the MPM comprises the following steps: when the number N of the selected MPMs is 1, selecting 1 coding block from the coding block on the left of the current coding block, and taking the intra-frame prediction mode of the selected coding block as the MPM; or when the number N of the selected MPMs is more than or equal to 2, selecting N coding blocks at equal intervals by taking H/(N-1) as an interval from the coding blocks at the left of the current coding block, and taking the intra-frame prediction mode of the N coding blocks as the MPM, wherein H is the height of the current coding block. For example, when N is 3, 3 MPMs are equidistantly selected from the left of the current coding block at intervals of H/(3-1) ═ H/2, as shown in fig. 4.
According to the embodiment of the invention, when the intra-frame prediction mode of the current coding block is different from the selected MPM, the intra-frame prediction mode of the current coding block is written in the code stream. For example, the intra prediction mode of the current coding block is written in the code stream according to the used method.
According to the embodiment of the invention, the intra-frame prediction mode of the current coding block is the intra-frame prediction mode with the lowest corresponding rate-distortion cost. For example, the encoder traverses all intra-frame prediction modes of a current coding block to obtain corresponding prediction pixel values, performs operations such as transformation and quantization on the current coding block according to the prediction pixel values, calculates rate-distortion cost corresponding to each intra-frame prediction mode, and finally selects the intra-frame prediction mode with the lowest rate-distortion cost according to the rate-distortion cost of each intra-frame prediction mode.
Fig. 5 shows a block diagram of an apparatus for encoding according to the present invention. The means 501 for encoding comprises: a memory 502 in which a computer program is stored, and a processor 503 which, when running the computer program, performs the following operations: selecting a most probable mode MPM of intra-frame prediction according to the relative relation of the width and the height of a current coding block; when the intra-frame prediction mode of the current coding block is the same as one of the selected MPMs, writing the identifier of the intra-frame prediction mode, which is the same as the MPM, into the code stream, and marking the MPM; and transmitting the code stream.
According to the embodiment of the invention, the selecting the MPM of the intra-frame prediction according to the width-height relative relation of the current coding block comprises the following steps: when the aspect ratio of the current coding block is larger than a first threshold (for example, the first threshold is larger than or equal to 1), selecting at least one coding block from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the at least one coding block as MPM; or when the aspect ratio of the current coding block is larger than a second threshold (for example, the second threshold is larger than or equal to 1), selecting at least one coding block from the coding blocks on the left of the current coding block, and taking the intra-frame prediction mode of the at least one coding block as the MPM.
According to the embodiment of the invention, selecting at least one coding block from coding blocks above a current coding block, and taking an intra prediction mode of the at least one coding block as MPM comprises the following steps: when the number N of the selected MPMs is 1, selecting 1 coding block from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the selected coding block as the MPM; or when the number N of the selected MPMs is more than or equal to 2, selecting N coding blocks at equal intervals by taking W/(N-1) as an interval from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the N coding blocks as the MPM, wherein W is the width of the current coding block.
According to the embodiment of the invention, selecting at least one coding block from the coding blocks on the left of the current coding block, and taking the intra-frame prediction mode of the at least one coding block as the MPM comprises the following steps: when the number N of the selected MPMs is 1, selecting 1 coding block from the coding block on the left of the current coding block, and taking the intra-frame prediction mode of the selected coding block as the MPM; or when the number N of the selected MPMs is more than or equal to 2, selecting N coding blocks at equal intervals by taking H/(N-1) as an interval from the coding blocks at the left of the current coding block, and taking the intra-frame prediction mode of the N coding blocks as the MPM, wherein H is the height of the current coding block.
The invention also provides a device for encoding. The apparatus for encoding includes: the selecting unit is configured to select the MPM of the intra-frame prediction according to the width-height relative relation of the current coding block; a writing unit configured to write an identifier of the intra prediction mode being the same as the MPM in the code stream and mark the same MPM when the intra prediction mode of the current coding block is the same as one of the selected MPMs; and a transmitting unit configured to transmit the code stream.
According to the embodiment of the invention, the selecting the MPM of the intra-frame prediction according to the width-height relative relation of the current coding block comprises the following steps: when the aspect ratio of the current coding block is larger than a first threshold (for example, the first threshold is larger than or equal to 1), selecting at least one coding block from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the at least one coding block as MPM; or when the aspect ratio of the current coding block is larger than a second threshold (for example, the second threshold is larger than or equal to 1), selecting at least one coding block from the coding blocks on the left of the current coding block, and taking the intra-frame prediction mode of the at least one coding block as the MPM.
According to the embodiment of the invention, selecting at least one coding block from coding blocks above a current coding block, and taking an intra prediction mode of the at least one coding block as MPM comprises the following steps: when the number N of the selected MPMs is 1, selecting 1 coding block from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the selected coding block as the MPM; or when the number N of the selected MPMs is more than or equal to 2, selecting N coding blocks at equal intervals by taking W/(N-1) as an interval from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the N coding blocks as the MPM, wherein W is the width of the current coding block.
According to the embodiment of the invention, selecting at least one coding block from the coding blocks on the left of the current coding block, and taking the intra-frame prediction mode of the at least one coding block as the MPM comprises the following steps: when the number N of the selected MPMs is 1, selecting 1 coding block from the coding block on the left of the current coding block, and taking the intra-frame prediction mode of the selected coding block as the MPM; or when the number N of the selected MPMs is more than or equal to 2, selecting N coding blocks at equal intervals by taking H/(N-1) as an interval from the coding blocks at the left of the current coding block, and taking the intra-frame prediction mode of the N coding blocks as the MPM, wherein H is the height of the current coding block.
Fig. 6 shows a flow chart of a method for image and/or video decoding according to the invention. The method comprises the following steps: receiving a code stream (S601); selecting MPMs for intra-frame prediction according to the relative relation of width and height of the current coding block (S602); and when the intra prediction mode information parsed from the code stream indicates that the intra prediction mode of the current coding block is the same as one of the selected MPMs, taking the same MPM as the intra prediction mode of the current coding block (S603).
According to the embodiment of the invention, the selecting the MPM of the intra-frame prediction according to the width-height relative relation of the current coding block comprises the following steps: when the aspect ratio of the current coding block is larger than a first threshold (for example, the first threshold is larger than or equal to 1), selecting at least one coding block from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the at least one coding block as MPM; or when the aspect ratio of the current coding block is larger than a second threshold (for example, the second threshold is larger than or equal to 1), selecting at least one coding block from the coding blocks on the left of the current coding block, and taking the intra-frame prediction mode of the at least one coding block as the MPM.
According to the embodiment of the invention, selecting at least one coding block from coding blocks above a current coding block, and taking an intra prediction mode of the at least one coding block as MPM comprises the following steps: when the number N of the selected MPMs is 1, selecting 1 coding block from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the selected coding block as the MPM; or when the number N of the selected MPMs is more than or equal to 2, selecting N coding blocks at equal intervals by taking W/(N-1) as an interval from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the N coding blocks as the MPM, wherein W is the width of the current coding block. For example, when N is 3, 3 MPMs are equidistantly selected from the top of the current coding block at an interval of W/(3-1) ═ W/2, as shown in fig. 3.
According to the embodiment of the invention, selecting at least one coding block from the coding blocks on the left of the current coding block, and taking the intra-frame prediction mode of the at least one coding block as the MPM comprises the following steps: when the number N of the selected MPMs is 1, selecting 1 coding block from the coding block on the left of the current coding block, and taking the intra-frame prediction mode of the selected coding block as the MPM; or when the number N of the selected MPMs is more than or equal to 2, selecting N coding blocks at equal intervals by taking H/(N-1) as an interval from the coding blocks at the left of the current coding block, and taking the intra-frame prediction mode of the N coding blocks as the MPM, wherein H is the height of the current coding block. For example, when N is 3, 3 MPMs are equidistantly selected from the left of the current coding block at intervals of H/(3-1) ═ H/2, as shown in fig. 4.
According to an embodiment of the invention, the method further comprises: when the parsed intra prediction mode information does not indicate that the intra prediction mode of the current encoding block is the same as one of the selected MPMs, the intra prediction mode of the current encoding block is derived from the intra prediction mode information. For example, the intra prediction mode is analyzed in a used method.
According to an embodiment of the invention, the method further comprises: and predicting the predicted value of the current coding block according to the intra-frame prediction mode of the current coding block. And reconstructing the image according to the prediction value to obtain a final decoded image.
Fig. 7 shows an apparatus for decoding according to the present invention. The apparatus for decoding 701 includes: a memory 702 in which a computer program is stored, and a processor 703 which, when running the computer program, performs the following operations: receiving a code stream; selecting a most probable mode MPM of intra-frame prediction according to the relative relation of the width and the height of a current coding block; and when the intra-frame prediction mode information analyzed from the code stream indicates that the intra-frame prediction mode of the current coding block is the same as one of the selected MPMs, taking the same MPM as the intra-frame prediction mode of the current coding block.
According to the embodiment of the invention, the selecting the MPM of the intra-frame prediction according to the width-height relative relation of the current coding block comprises the following steps: when the aspect ratio of the current coding block is larger than a first threshold (for example, the first threshold is larger than or equal to 1), selecting at least one coding block from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the at least one coding block as MPM; or when the aspect ratio of the current coding block is larger than a second threshold (for example, the second threshold is larger than or equal to 1), selecting at least one coding block from the coding blocks on the left of the current coding block, and taking the intra-frame prediction mode of the at least one coding block as the MPM.
According to the embodiment of the invention, selecting at least one coding block from coding blocks above a current coding block, and taking an intra prediction mode of the at least one coding block as MPM comprises the following steps: when the number N of the selected MPMs is 1, selecting 1 coding block from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the selected coding block as the MPM; or when the number N of the selected MPMs is more than or equal to 2, selecting N coding blocks at equal intervals by taking W/(N-1) as an interval from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the N coding blocks as the MPM, wherein W is the width of the current coding block. For example, when N is 3, 3 MPMs are equidistantly selected from the top of the current coding block at an interval of W/(3-1) ═ W/2, as shown in fig. 3.
According to the embodiment of the invention, selecting at least one coding block from the coding blocks on the left of the current coding block, and taking the intra-frame prediction mode of the at least one coding block as the MPM comprises the following steps: when the number N of the selected MPMs is 1, selecting 1 coding block from the coding block on the left of the current coding block, and taking the intra-frame prediction mode of the selected coding block as the MPM; or when the number N of the selected MPMs is more than or equal to 2, selecting N coding blocks at equal intervals by taking H/(N-1) as an interval from the coding blocks at the left of the current coding block, and taking the intra-frame prediction mode of the N coding blocks as the MPM, wherein H is the height of the current coding block. For example, when N is 3, 3 MPMs are equidistantly selected from the left of the current coding block at intervals of H/(3-1) ═ H/2, as shown in fig. 4.
The present invention also provides an apparatus for decoding, comprising: a receiving unit configured to receive a code stream; an analysis unit configured to analyze intra prediction mode information from the code stream; and a derivation unit configured to select a most probable mode MPM for intra prediction according to a height-width relative relationship of the current encoding block, and when the intra prediction mode information indicates that the intra prediction mode of the current encoding block is the same as one of the selected MPMs, take the same MPM as the intra prediction mode of the current encoding block.
According to the embodiment of the invention, the selecting the MPM of the intra-frame prediction according to the width-height relative relation of the current coding block comprises the following steps: when the aspect ratio of the current coding block is larger than a first threshold (for example, the first threshold is larger than or equal to 1), selecting at least one coding block from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the at least one coding block as MPM; or when the aspect ratio of the current coding block is larger than a second threshold (for example, the second threshold is larger than or equal to 1), selecting at least one coding block from the coding blocks on the left of the current coding block, and taking the intra-frame prediction mode of the at least one coding block as the MPM.
According to the embodiment of the invention, selecting at least one coding block from coding blocks above a current coding block, and taking an intra prediction mode of the at least one coding block as MPM comprises the following steps: when the number N of the selected MPMs is 1, selecting 1 coding block from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the selected coding block as the MPM; or when the number N of the selected MPMs is more than or equal to 2, selecting N coding blocks at equal intervals by taking W/(N-1) as an interval from the coding blocks above the current coding block, and taking the intra-frame prediction mode of the N coding blocks as the MPM, wherein W is the width of the current coding block.
According to the embodiment of the invention, selecting at least one coding block from the coding blocks on the left of the current coding block, and taking the intra-frame prediction mode of the at least one coding block as the MPM comprises the following steps: when the number N of the selected MPMs is 1, selecting 1 coding block from the coding block on the left of the current coding block, and taking the intra-frame prediction mode of the selected coding block as the MPM; or when the number N of the selected MPMs is more than or equal to 2, selecting N coding blocks at equal intervals by taking H/(N-1) as an interval from the coding blocks at the left of the current coding block, and taking the intra-frame prediction mode of the N coding blocks as the MPM, wherein H is the height of the current coding block.
The present invention also provides a computer readable storage medium for storing non-transitory computer readable instructions which, when executed by a computer, cause the computer to perform a method as described above.
The example embodiments described herein are not meant to be limiting. The aspects of the present disclosure, as generally described herein, and illustrated in the figures, can be arranged, substituted, combined, separated, and designed in a wide variety of different configurations, all of which are contemplated herein. Furthermore, the features shown in each figure may be used in combination with each other, unless the context indicates otherwise. Thus, the drawings are to be generally regarded as forming a part of one or more general embodiments, but it is to be understood that not all illustrated features are required for each embodiment.
While the invention has been shown and described with reference to certain embodiments thereof, it will be understood by those skilled in the art that various changes and modifications in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (20)

1.一种用于编码的方法，包括：1. A method for encoding, comprising: 根据当前编码块的宽高相对关系选取帧内预测的最可能模式MPM；Select the most probable mode MPM of intra-frame prediction according to the relative relationship between the width and height of the current coding block; 当当前编码块的帧内预测模式与所选取的MPM中的一个相同时，在码流中写入帧内预测模式与MPM相同的标识，并标记该相同的MPM；以及When the intra-frame prediction mode of the current coding block is the same as one of the selected MPMs, write the same identification of the intra-frame prediction mode as the MPM in the code stream, and mark the same MPM; and 发送该码流。send the stream. 2.如权利要求1所述的方法，其中根据当前编码块的宽高相对关系选取帧内预测的MPM包括：2. The method according to claim 1, wherein selecting the MPM of intra-frame prediction according to the relative relationship of the current coding block in terms of width and height comprises: 当当前编码块的宽高比大于第一阈值时，从当前编码块上方的编码块中选取至少一个编码块，以该至少一个编码块的帧内预测模式作为MPM；或者When the aspect ratio of the current coding block is greater than the first threshold, select at least one coding block from the coding blocks above the current coding block, and use the intra prediction mode of the at least one coding block as the MPM; or 当当前编码块的高宽比大于第二阈值时，从当前编码块左方的编码块中选取至少一个编码块，以该至少一个编码块的帧内预测模式作为MPM。When the aspect ratio of the current coding block is greater than the second threshold, at least one coding block is selected from the coding blocks to the left of the current coding block, and the intra prediction mode of the at least one coding block is used as the MPM. 3.如权利要求2所述的方法，其中从当前编码块上方的编码块选取至少一个编码块，以该至少一个编码块的帧内预测模式作为MPM包括：3. The method of claim 2, wherein selecting at least one coding block from a coding block above the current coding block, and using the intra prediction mode of the at least one coding block as the MPM comprises: 当选取的MPM的数量N＝1时，从当前编码块上方的编码块选取1个编码块，以所选取的编码块的帧内预测模式作为MPM；或者When the number of selected MPMs is N=1, select 1 coding block from the coding block above the current coding block, and use the intra prediction mode of the selected coding block as the MPM; or 当选取的MPM的数量N≥2时，从当前编码块上方的编码块中以W/(N-1)为间隔等距离地选取N个编码块，以该N个编码块的帧内预测模式作为MPM，其中W是当前编码块的宽。When the number of selected MPMs is N ≥ 2, N coding blocks are selected equidistantly from the coding blocks above the current coding block at intervals of W/(N-1), and the intra prediction modes of the N coding blocks are used. As MPM, where W is the width of the current coding block. 4.如权利要求2所述的方法，其中从当前编码块左方的编码块中选取至少一个编码块，以该至少一个编码块的帧内预测模式作为MPM包括：4. The method of claim 2, wherein selecting at least one coding block from the coding blocks to the left of the current coding block, and using the intra prediction mode of the at least one coding block as the MPM comprises: 当选取的MPM的数量N＝1时，从当前编码块左方的编码块选取1个编码块，以所选取的编码块的帧内预测模式作为MPM；或者When the number of selected MPMs is N=1, select 1 coding block from the coding block to the left of the current coding block, and use the intra prediction mode of the selected coding block as the MPM; or 当选取的MPM的数量N≥2时，从当前编码块左方的编码块中以H/(N-1)为间隔等距离地选取N个编码块，以该N个编码块的帧内预测模式作为MPM，其中H是当前编码块的高。When the number of selected MPMs is N≥2, select N coding blocks equidistantly from the coding blocks to the left of the current coding block at H/(N-1) intervals, and use the intra-frame prediction of the N coding blocks Mode as MPM, where H is the high of the current coded block. 5.一种用于编码的装置，包括：5. An apparatus for encoding, comprising: 存储器，其中存储有计算机程序，以及memory, in which the computer program is stored, and 处理器，其在运行所述计算机程序时，执行下面的操作：The processor, when running the computer program, performs the following operations: 根据当前编码块的宽高相对关系选取帧内预测的最可能模式MPM；Select the most probable mode MPM of intra-frame prediction according to the relative relationship between the width and height of the current coding block; 当当前编码块的帧内预测模式与所选取的MPM中的一个相同时，在码流中写入帧内预测模式与MPM相同的标识，并标记该相同的MPM；以及When the intra-frame prediction mode of the current coding block is the same as one of the selected MPMs, write the same identification of the intra-frame prediction mode as the MPM in the code stream, and mark the same MPM; and 发送该码流。send the stream. 6.如权利要求5所述的装置，其中根据当前编码块的宽高相对关系选取帧内预测的MPM包括：6. The apparatus of claim 5 , wherein selecting the MPM of intra-frame prediction according to the relative relationship of the current coding block in terms of width and height comprises: 当当前编码块的宽高比大于第一阈值时，从当前编码块上方的编码块中选取至少一个编码块，以该至少一个编码块的帧内预测模式作为MPM；或者When the aspect ratio of the current coding block is greater than the first threshold, select at least one coding block from the coding blocks above the current coding block, and use the intra prediction mode of the at least one coding block as the MPM; or 当当前编码块的高宽比大于第二阈值时，从当前编码块左方的编码块中选取至少一个编码块，以该至少一个编码块的帧内预测模式作为MPM。When the aspect ratio of the current coding block is greater than the second threshold, at least one coding block is selected from the coding blocks to the left of the current coding block, and the intra prediction mode of the at least one coding block is used as the MPM. 7.如权利要求6所述的方法，其中从当前编码块上方的编码块中选取至少一个编码块，以该至少一个编码块的帧内预测模式作为MPM包括：7. The method of claim 6, wherein selecting at least one coding block from coding blocks above the current coding block, and using the intra prediction mode of the at least one coding block as the MPM comprises: 当选取的MPM的数量N＝1时，从当前编码块上方的编码块选取1个编码块，以所选取的编码块的帧内预测模式作为MPM；或者When the number of selected MPMs is N=1, select 1 coding block from the coding block above the current coding block, and use the intra prediction mode of the selected coding block as the MPM; or 当选取的MPM的数量N≥2时，从当前编码块上方的编码块中以W/(N-1)为间隔等距离地选取N个编码块，以该N个编码块的帧内预测模式作为MPM，其中W是当前编码块的宽。When the number of selected MPMs is N ≥ 2, N coding blocks are selected equidistantly from the coding blocks above the current coding block at intervals of W/(N-1), and the intra prediction modes of the N coding blocks are used. As MPM, where W is the width of the current coding block. 8.如权利要求6所述的方法，其中从当前编码块左方的编码块中选取至少一个编码块，以该至少一个编码块的帧内预测模式作为MPM包括：8. The method of claim 6, wherein selecting at least one coding block from the coding blocks to the left of the current coding block, and using the intra prediction mode of the at least one coding block as the MPM comprises: 当选取的MPM的数量N＝1时，从当前编码块左方的编码块选取1个编码块，以所选取的编码块的帧内预测模式作为MPM；或者When the number of selected MPMs is N=1, select 1 coding block from the coding block to the left of the current coding block, and use the intra prediction mode of the selected coding block as the MPM; or 当选取的MPM的数量N≥2时，从当前编码块左方的编码块中以H/(N-1)为间隔等距离地选取N个编码块，以该N个编码块的帧内预测模式作为MPM，其中H是当前编码块的高。When the number of selected MPMs is N≥2, select N coding blocks equidistantly from the coding blocks to the left of the current coding block at H/(N-1) intervals, and use the intra-frame prediction of the N coding blocks Mode as MPM, where H is the high of the current coded block. 9.一种用于编码的装置，包括：9. An apparatus for encoding, comprising: 选取单元，被配置为根据当前编码块的宽高相对关系选取帧内预测的最可能模式MPM；a selection unit, configured to select the most probable mode MPM of intra-frame prediction according to the relative relationship between the width and height of the current coding block; 写入单元，被配置为当当前编码块的帧内预测模式与所选取的MPM中的一个相同时，在码流中写入帧内预测模式与MPM相同的标识，并标记该相同的MPM；以及The writing unit is configured to write the same identification of the intra-frame prediction mode as the MPM in the code stream when the intra-frame prediction mode of the current coding block is the same as one of the selected MPMs, and mark the same MPM; as well as 发送单元，被配置为发送该码流。A sending unit, configured to send the code stream. 10.一种计算机可读存储介质，用于存储非暂时性计算机可读指令，当所述非暂时性计算机可读指令由计算机执行时，使得所述计算机执行如权利要求1-4之一所述的方法。10. A computer-readable storage medium for storing non-transitory computer-readable instructions which, when executed by a computer, cause the computer to perform the functions of one of claims 1-4. method described. 11.一种用于解码的方法，包括：11. A method for decoding, comprising: 接收码流；receive stream; 根据当前编码块的宽高相对关系选取帧内预测的最可能模式MPM；以及selecting the most probable mode MPM for intra-frame prediction according to the relative relationship between the width and height of the current coding block; and 当从码流中解析的帧内预测模式信息指示当前编码块的帧内预测模式与所选取的MPM中的一个相同时，将该相同的MPM作为当前编码块的帧内预测模式。When the intra prediction mode information parsed from the code stream indicates that the intra prediction mode of the current coding block is the same as one of the selected MPMs, the same MPM is used as the intra prediction mode of the current coding block. 12.如权利要求11所述的方法，其中根据当前编码块的宽高相对关系选取帧内预测的MPM包括：12. The method of claim 11 , wherein selecting the MPM for intra-frame prediction according to the relative relationship of the current coding block in terms of width and height comprises: 当当前编码块的宽高比大于第一阈值时，从当前编码块上方的编码块中选取至少一个编码块，以该至少一个编码块的帧内预测模式作为MPM；或者When the aspect ratio of the current coding block is greater than the first threshold, select at least one coding block from the coding blocks above the current coding block, and use the intra prediction mode of the at least one coding block as the MPM; or 当当前编码块的高宽比大于第二阈值时，从当前编码块左方的编码块中选取至少一个编码块，以该至少一个编码块的帧内预测模式作为MPM。When the aspect ratio of the current coding block is greater than the second threshold, at least one coding block is selected from the coding blocks to the left of the current coding block, and the intra prediction mode of the at least one coding block is used as the MPM. 13.如权利要求12所述的方法，其中从当前编码块上方的编码块选取至少一个编码块，以该至少一个编码块的帧内预测模式作为MPM包括：13. The method of claim 12, wherein selecting at least one coding block from a coding block above the current coding block, and using the intra prediction mode of the at least one coding block as the MPM comprises: 当选取的MPM的数量N＝1时，从当前编码块上方的编码块选取1个编码块，以所选取的编码块的帧内预测模式作为MPM；或者When the number of selected MPMs is N=1, select 1 coding block from the coding block above the current coding block, and use the intra prediction mode of the selected coding block as the MPM; or 当选取的MPM的数量N≥2时，从当前编码块上方的编码块中以W/(N-1)为间隔等距离地选取N个编码块，以该N个编码块的帧内预测模式作为MPM，其中W是当前编码块的宽。When the number of selected MPMs is N ≥ 2, N coding blocks are selected equidistantly from the coding blocks above the current coding block at intervals of W/(N-1), and the intra prediction modes of the N coding blocks are used. As MPM, where W is the width of the current coding block. 14.如权利要求12所述的方法，其中从当前编码块左方的编码块中选取至少一个编码块，以该至少一个编码块的帧内预测模式作为MPM包括：14. The method of claim 12, wherein selecting at least one coding block from the coding blocks to the left of the current coding block, and using the intra prediction mode of the at least one coding block as the MPM comprises: 当选取的MPM的数量N＝1时，从当前编码块左方的编码块选取1个编码块，以所选取的编码块的帧内预测模式作为MPM；或者When the number of selected MPMs is N=1, select 1 coding block from the coding block to the left of the current coding block, and use the intra prediction mode of the selected coding block as the MPM; or 当选取的MPM的数量N≥2时，从当前编码块左方的编码块中以H/(N-1)为间隔等距离地选取N个编码块，以该N个编码块的帧内预测模式作为MPM，其中H是当前编码块的高。When the number of selected MPMs is N≥2, select N coding blocks equidistantly from the coding blocks to the left of the current coding block at H/(N-1) intervals, and use the intra-frame prediction of the N coding blocks Mode as MPM, where H is the high of the current coded block. 15.一种用于解码的装置，包括：15. An apparatus for decoding, comprising: 存储器，其中存储有计算机程序，以及memory, in which the computer program is stored, and 处理器，其在运行所述计算机程序时，执行下面的操作：The processor, when running the computer program, performs the following operations: 接收码流；receive stream; 根据当前编码块的宽高相对关系选取帧内预测的最可能模式MPM；以及selecting the most probable mode MPM for intra-frame prediction according to the relative relationship between the width and height of the current coding block; and 当从码流中解析的帧内预测模式信息指示当前编码块的帧内预测模式与所选取的MPM中的一个相同时，将该相同的MPM作为当前编码块的帧内预测模式。When the intra prediction mode information parsed from the code stream indicates that the intra prediction mode of the current coding block is the same as one of the selected MPMs, the same MPM is used as the intra prediction mode of the current coding block. 16.如权利要求15所述的装置，其中根据当前编码块的宽高相对关系选取帧内预测的MPM包括：16. The apparatus of claim 15 , wherein selecting the MPM for intra-frame prediction according to the relative relationship between the width and height of the current coding block comprises: 当当前编码块的宽高比大于第一阈值时，从当前编码块上方的编码块中选取至少一个编码块，以该至少一个编码块的帧内预测模式作为MPM；或者When the aspect ratio of the current coding block is greater than the first threshold, select at least one coding block from the coding blocks above the current coding block, and use the intra prediction mode of the at least one coding block as the MPM; or 当当前编码块的高宽比大于第二阈值时，从当前编码块左方的编码块中选取至少一个编码块，以该至少一个编码块的帧内预测模式作为MPM。When the aspect ratio of the current coding block is greater than the second threshold, at least one coding block is selected from the coding blocks to the left of the current coding block, and the intra prediction mode of the at least one coding block is used as the MPM. 17.如权利要求16所述的方法，其中从当前编码块上方的编码块选取至少一个编码块，以该至少一个编码块的帧内预测模式作为MPM包括：17. The method of claim 16, wherein selecting at least one coding block from a coding block above the current coding block, and using the intra prediction mode of the at least one coding block as the MPM comprises: 当选取的MPM的数量N＝1时，从当前编码块上方的编码块选取1个编码块，以所选取的编码块的帧内预测模式作为MPM；或者When the number of selected MPMs is N=1, select 1 coding block from the coding block above the current coding block, and use the intra prediction mode of the selected coding block as the MPM; or 当选取的MPM的数量N≥2时，从当前编码块上方的编码块中以W/(N-1)为间隔等距离地选取N个编码块，以该N个编码块的帧内预测模式作为MPM，其中W是当前编码块的宽。When the number of selected MPMs is N ≥ 2, N coding blocks are selected equidistantly from the coding blocks above the current coding block at intervals of W/(N-1), and the intra prediction modes of the N coding blocks are used. As MPM, where W is the width of the current coding block. 18.如权利要求16所述的方法，其中从当前编码块左方的编码块中选取至少一个编码块，以该至少一个编码块的帧内预测模式作为MPM包括：18. The method of claim 16, wherein selecting at least one coding block from the coding blocks to the left of the current coding block, and using the intra prediction mode of the at least one coding block as the MPM comprises: 当选取的MPM的数量N＝1时，从当前编码块左方的编码块选取1个编码块，以所选取的编码块的帧内预测模式作为MPM；或者When the number of selected MPMs is N=1, select 1 coding block from the coding block to the left of the current coding block, and use the intra prediction mode of the selected coding block as the MPM; or 当选取的MPM的数量N≥2时，从当前编码块左方的编码块中以H/(N-1)为间隔等距离地选取N个编码块，以该N个编码块的帧内预测模式作为MPM，其中H是当前编码块的高。When the number of selected MPMs is N≥2, select N coding blocks equidistantly from the coding blocks to the left of the current coding block at H/(N-1) intervals, and use the intra-frame prediction of the N coding blocks Mode as MPM, where H is the high of the current coded block. 19.一种用于解码的装置，包括：19. An apparatus for decoding, comprising: 接收单元，被配置为接收码流；a receiving unit, configured to receive the code stream; 解析单元，被配置为从码流中解析帧内预测模式信息；和a parsing unit configured to parse intra prediction mode information from the code stream; and 导出单元，被配置为根据当前编码块的宽高相对关系选取帧内预测的最可能模式MPM，以及当帧内预测模式信息指示当前编码块的帧内预测模式与所选取的MPM中的一个相同时，将该相同的MPM作为当前编码块的帧内预测模式。The deriving unit is configured to select the most probable mode MPM of intra-frame prediction according to the relative relationship between the width and height of the current coding block, and when the intra-frame prediction mode information indicates that the intra-frame prediction mode of the current coding block is the same as one of the selected MPMs; At the same time, the same MPM is used as the intra prediction mode of the current coding block. 20.一种计算机可读存储介质，用于存储非暂时性计算机可读指令，当所述非暂时性计算机可读指令由计算机执行时，使得所述计算机执行如权利要求11-14之一所述的方法。20. A computer-readable storage medium for storing non-transitory computer-readable instructions which, when executed by a computer, cause the computer to perform the functions of one of claims 11-14. method described.
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