KR101237411B1 - Prediction unit syntax system and the method for video codec - Google Patents

Prediction unit syntax system and the method for video codec Download PDF

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KR101237411B1
KR101237411B1 KR20110031265A KR20110031265A KR101237411B1 KR 101237411 B1 KR101237411 B1 KR 101237411B1 KR 20110031265 A KR20110031265 A KR 20110031265A KR 20110031265 A KR20110031265 A KR 20110031265A KR 101237411 B1 KR101237411 B1 KR 101237411B1
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prediction unit
prediction
notifying
mode
bit
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KR20120113518A (en
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김재곤
최해철
이상용
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한국항공대학교산학협력단
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Abstract

The present invention relates to the syntax structure of the next-generation video compression technology (HEVC) being standardized by H.264 / AVC, which is a video compression standard, and the JCT-VC, and is a prediction unit syntax system of a video codec according to the present invention. The prediction unit classification method using the division notification unit allocates an unsigned integer 1 bit to the syntax element, notifying whether the current prediction unit is divided, or not, using the prediction mode notification unit, depending on whether or not the syntax element is divided. Assigning an unsigned integer 2 bits or an integer 1 bit to an integer, and notifying the prediction mode, and using the prediction unit notification unit, investigating the probability distribution for each prediction unit, and calculating an unsigned integer 2 bits or an unsigned integer exponential Golem code. Assigning, notifying the prediction unit.

Description

Prediction unit syntax system and method for classifying video codec using prediction unit syntax system of video codec

The present invention provides a syntax structure of H.264 / AVC, a video compression standard, and High Efficiency Video Coding (HEVC), which is being standardized by Joint Collaborative Team on Video Coding (JCT-VC). In more detail, the prediction unit syntax system of the video codec capable of efficiently expressing the block size of the prediction unit and further providing a video codec with improved performance by providing the partition information and the prediction mode in the prediction unit syntax. And a method of classifying prediction units using the same.

In general, a video encoding method compresses a video signal through four prediction modes: a skip mode, a direct mode, an inter prediction mode, and an intra prediction mode. Recently, video encoding standards have various block sizes (block width and length length). ).

Therefore, the normal decoding can be performed only by storing information on which block size and prediction mode is compressed in the bitstream.

Currently, when the CU is 2N × 2N size in the HEV standardized in JCT-VC, the direct mode supports only 2N × 2N prediction units, and the inter prediction mode is 2N × 2N, 2N × N, N × 2N, N Four prediction units of × N are allowed.

In addition, the intra-picture mode allows encoding of 2N × 2N and N × N prediction units.

FIG. 6 is a diagram illustrating a syntax structure for classifying a conventional prediction unit. First, an unsigned integer 2 bit is allocated using a pred-mode syntax element of a direct mode, an inter-screen mode, and an intra-screen mode (S101). Next, in step S102, an unsigned integer exponential golem code is allocated to the inter_partition_idc syntax element in order to distinguish four prediction units of the inter prediction mode.

Next, in order to distinguish two prediction units of the intra prediction mode, an unsigned integer 1 bit is allocated to the intra_split_flag syntax element (S103).

That is, in the conventional prediction unit syntax, prediction modes are classified first, and then prediction units are distinguished. In this case, a large number of bits is allocated according to an occurrence probability in encoding an unsigned integer exponential golem code to distinguish the prediction units. Occurs.

The present invention has been proposed to solve the above conventional problems,

An object of a prediction unit syntax system of a video codec according to the present invention is to provide a syntax structure capable of efficiently representing a block size of a prediction unit.

Another object is to notify whether or not the current prediction unit is divided, including a division notification unit.

Another object is to notify the prediction mode according to whether or not including a prediction mode notification unit.

Still another object is to notify a prediction unit according to whether or not to be divided and a prediction mode, including a prediction unit notification unit.

The purpose of the prediction unit classification method using the prediction unit syntax system of the video codec according to the present invention is to efficiently determine the number of bits representing the block size of the prediction unit by using whether to divide or not, the prediction mode, and the syntax for notifying the prediction unit. To allocate.

Another object is to notify the prediction mode according to whether or not to split, including notifying the prediction mode.

Another purpose is to represent each non-divided prediction mode with 3 bits in total.

Another purpose is to represent the divided intra picture mode in total of 2 bits.

Another object is that the divided inter-screen mode allocates bits by determining unsigned integer 2-bits or unsigned exponential golem codes by probability distribution investigation.

Another object of the prediction unit classification method using the prediction unit syntax system of the video codec according to the present invention is to minimize the number of bits for distinguishing prediction units by first and second notification of whether to split based on the current prediction unit. .

Another object is to represent each prediction unit that is not split in the primary notification of division or not, including notifying the prediction mode, in total of 3 bits.

Still another object is to express the inter-screen mode and the intra-screen mode in total of 3 bits when split in the primary notification of division or not and split in the secondary notification whether or not.

Still another object is to express the inter-screen mode with a total of 3 bits when split in the primary notification of division or not, and divided in the secondary notification whether or not to divide.

The prediction unit syntax system of the video codec according to the present invention is connected to the division notification unit that notifies whether the current prediction unit is divided or not when the parsing of the prediction unit bitstream, and the division notification unit, and notifies the prediction mode of the prediction unit. And a prediction unit notification unit connected to the prediction mode notification unit and the prediction mode notification unit to notify the prediction unit of the prediction mode.

In the prediction unit classification method using the prediction unit syntax system of the video codec according to the present invention, by using a division notification unit, an unsigned integer 1 bit is allocated to a syntax element to notify whether a current prediction unit is divided or not, a prediction mode. By using a notification unit, assigning an unsigned integer 2 bits or an integer 1 bit to a syntax element according to whether to split, and notifying the prediction mode, and using the prediction unit notification unit, investigating the probability distribution for each prediction unit, And assigning an integer 2-bit or an unsigned integer exponential golem code to notify the prediction unit.

According to another aspect of the present invention, a prediction unit classification method using a prediction unit syntax system of a video codec uses a division notification unit to allocate an unsigned integer 1 bit to a syntax element and to firstly notify whether a current prediction unit is divided. A step of allocating an unsigned integer 2 bits to a syntax element in accordance with the primary partitioning notification by using the prediction mode notification unit, and notifying the primary prediction mode, and an unsigned integer in the syntax element using the partitioning notification unit. 2nd step of notifying whether the current prediction unit is divided by allocating 1 bit, and using the prediction mode notification unit, assigning an unsigned integer 1 bit to the syntax element according to the 2nd division whether or not the second prediction mode is obtained. The step of notifying and using the prediction unit notification unit, examines the probability distribution for each prediction unit, allocates an unsigned integer 1 bit, and notifies the prediction unit. Characterized in that it comprises a step.

As described above, the prediction unit syntax system of the video codec according to the present invention provides a syntax structure capable of efficiently representing the block size of the prediction unit, thereby improving the performance of the video codec.

In addition, by including the division notification unit, it is possible to notify whether or not the current prediction unit is divided.

In addition, by including the prediction mode notification unit, it is possible to notify the prediction mode according to whether or not the division.

In addition, by including the prediction unit notification unit, it is possible to notify the prediction unit according to whether or not the division and the prediction mode.

In the prediction unit classification method using the prediction unit syntax system of the video codec according to the present invention, the number of bits representing the block size of the prediction unit may be efficiently allocated by using whether to divide or not, the prediction mode, and the syntax for notifying the prediction unit. It can be effective.

In addition, by including the step of notifying the prediction mode, there is an effect that can be notified whether the prediction mode according to whether or not divided.

In addition, each prediction mode that is not divided has an effect that can be represented by a total of 3 bits.

In addition, there is an effect that the divided intra picture mode can be represented by a total of 2 bits.

In addition, the partitioned inter-screen mode has the effect of assigning bits by determining unsigned integer 2-bit or unsigned exponential golem code by probability distribution investigation.

According to another aspect of the present invention, a method of classifying prediction units using a prediction unit syntax system of a video codec may minimize the number of bits for classifying prediction units by first and second notifying whether a partition is performed according to a current prediction unit. There is.

In addition, by including the step of notifying the prediction mode, there is an effect that can be represented by a total of 3 bits for each prediction unit that is not divided in the primary notification whether or not to split.

In addition, when splitting is performed by the primary notification whether or not to be divided and divided by the secondary notification whether or not to divide, the inter-screen mode and the intra-screen mode can be expressed by a total of 3 bits.

In addition, when splitting is performed by the primary notification of division or not, and divided by the secondary notification whether or not the division is performed, there is an effect that the inter-screen mode can be expressed by a total of 3 bits.

1 is a block diagram of a prediction unit syntax system of a video codec according to the present invention;
2 is a first embodiment of a prediction unit classification method using a prediction unit syntax system of a video codec according to the present invention;
3 is a second embodiment of a prediction unit classification method using a prediction unit syntax system of a video codec according to the present invention;
4 is a third embodiment of a prediction unit classification method using a prediction unit syntax system of a video codec according to the present invention;
5 is a comparison table of the number of bits generated in the prediction unit classification method and the conventional prediction unit classification method using the prediction unit syntax system of the video codec according to the present invention.
6 is a conceptual diagram of a prediction unit classification method of a conventional video codec.

Hereinafter, a detailed description for implementing the prediction unit syntax system of the video codec and the prediction unit classification method using the same according to the present invention will be described.

1 is a diagram illustrating a configuration of a prediction unit syntax system of a video codec according to the present invention, and includes a segmentation notification unit 10, a prediction mode notification unit 20, and a prediction unit notification unit 30.

The parsing or notifying unit 10 notifies whether or not the current prediction unit is split when parsing the prediction unit bitstream. In an embodiment of the present invention, the split_flag syntax element allocates 1 bit of an unsigned integer to split or not. To notify.

The prediction mode notification unit 20 is connected to the division notification unit 10 and informs the prediction mode of the prediction unit, and according to an embodiment of the present invention, an unsigned integer in the pred_mode0 syntax element depends on whether the prediction mode is divided or not. Two bits or one integer bit are allocated to notify the prediction mode.

The prediction unit notification unit 30 is connected to the prediction mode notification unit 20 and informs the prediction unit of the prediction mode. In an embodiment of the present invention, the probability distribution for each prediction unit in the inter prediction mode is provided. Investigation is made to determine and assign an unsigned integer 2-bit or unsigned integer exponential golem code to the inter_partition-idc syntax element.

As described above, applying the prediction unit syntax system of the video codec according to the present invention provides a syntax structure capable of efficiently expressing the block size of the prediction unit, thereby having the effect of improving the performance of the video codec. It becomes possible.

2 is a diagram illustrating a first embodiment of a prediction unit classification method using a prediction unit syntax system of a video codec according to an embodiment of the present invention. First, a split_flag syntax element is coded using the division notification unit 10. A step of notifying whether the current prediction unit is divided is allocated by allocating an integer 1 bit that is not present (S201).

Next, by using the prediction mode notification unit 20, an unsigned integer 2 bits or an integer 1 bit is allocated to a syntax element according to whether to divide or not, and the prediction mode is notified. (S202, S204).

When step S202 is not divided in step S201, an unsigned integer 2 bits are allocated to the pred_mode0 syntax, and are divided into a direct mode, an inter screen mode, and an intra screen mode.

In the first embodiment according to the present invention, the direct mode, inter screen mode, and intra picture mode have a 2N × 2N prediction unit, and have 1 bit and a prediction mode for notifying whether to divide. It is characterized by a total of 3 bits, including 2 bits for notification.

Further, in step S204, when divided in step S201, an unsigned integer 1 bit is allocated to the pred_mode1 syntax, thereby being divided into an inter screen mode and an intra screen mode.

In this case, the intra-screen mode in the case of division has N × N prediction units and is represented by a total of 2 bits, including 1 bit for notifying whether to be divided or 1 bit for notifying the prediction mode.

Next, using the prediction unit notification unit 30, investigating the probability distribution for each prediction unit in the inter-screen mode, allocating an unsigned integer 2-bit or an unsigned integer exponential golem code, and notifying the prediction unit (S203)

The step S203 is for informing whether the prediction unit of the inter-screen mode is 2N × N, N × 2N, or N × N, and assigns an unsigned integer 2-bit or an unsigned integer exponential Golem code to the inter_partition_idc syntax. .

In the embodiment of the present invention, when assigning an unsigned integer exponential golem code, a 2N × N prediction unit includes a total of 1 bit for notifying whether to divide, 1 bit for notifying the prediction mode, and 1 bit for an integer exponential Golem code. It is represented by 3 bits.

The prediction unit of Nx2N is represented by a total of 5 bits, including 1 bit for notifying whether the partition is divided, 1 bit for notifying the prediction mode, and 3 bits for the integer exponential Golem code.

In addition, the N × N prediction unit is represented by a total of 5 bits, including 1 bit for notifying whether the partition is divided, 1 bit for notifying the prediction mode, and 3 bits for the integer exponential Golem code.

When 2 bits of unsigned integers are allocated, all of the prediction units of 2N × N, N × 2N, and N × N have 1 bit indicating whether the N × N prediction unit is split, 1 bit indicating the prediction mode, and 1 bit indicating the prediction mode, and an integer exponent. It is represented by a total of 4 bits, including 2 bits of Gollum code.

FIG. 3 is a diagram illustrating a second embodiment of a method of classifying prediction units using a prediction unit syntax system of a video codec according to the present invention. The difference from the first embodiment is in an intra-picture mode prediction unit. In the case of 2N × 2N, if the probability is greater than that of N × N, the step of allocating the unsigned integer 1 bit to the Mode_partition syntax element is performed using the division notification unit 10 (S301). )

In step S301, when not partitioned, an unsigned integer 2 bits is allocated to a syntax element, and thus divided into a direct mode and an inter-screen mode of a 2N × 2N prediction unit, and an intra-picture mode of an N × N prediction unit.

In addition, when divided, an unsigned integer 1 bit is assigned to a syntax element, thereby being divided into an inter-screen mode excluding the 2N × 2N prediction unit and an intra-picture mode of the 2N × 2N prediction unit.

4 is a diagram illustrating a third embodiment of a method of classifying prediction units using a prediction unit syntax system of a video codec according to the present invention, wherein the split_flag0 syntax element is unsigned by using the division notification unit 10. A step of first notifying whether the current prediction unit is divided by allocating an integer 1 bit is performed (S401).

Next, when the prediction mode notification unit 20 does not divide according to the primary partitioning notification, by assigning an unsigned integer 2 bits to the pred_mode0 syntax element, the primary prediction mode is notified. (S402)

If not divided in step S402, the direct mode, inter-screen mode and intra-screen mode of the 2N × 2N prediction unit, divided into the direct mode, inter-screen mode and the intra-screen mode of the 2N × 2N prediction unit, whether or not divided It is represented by a total of 3 bits, including 1 bit for notifying and 2 bits for notifying the prediction mode.

Next, by using the split notification unit 10, an unsigned integer 1 bit is allocated to the split_flag1 syntax element, and second notification of whether the current prediction unit is split is performed (S403).

Next, by using the prediction unit notification unit 30, an unsigned integer 1 bit is allocated to the inter_partition_ide syntax element according to the notification of the secondary partitioning in step S403, and the prediction unit is notified. S404)

In the embodiment of the present invention, the step 404 is divided in the step of notifying whether the primary division is performed (S401), and in the step of notifying the division of the second prediction unit (S403) in the second division, the code is not divided. By assigning 1 bit without an integer, the screen is divided into inter prediction modes of 2N × N and N × 2N prediction units, and the inter prediction modes of 2N × N and N × 2N prediction units are 1-bit prediction mode. It is represented by a total of 3 bits, including 1 bit for notifying and 1 bit for notifying the prediction unit.

In addition, when split in step S403, an unsigned integer 1 bit is allocated to the pred_mode1 syntax element to notify the second prediction mode (S405).

In the embodiment of the present invention, step S405 is divided in step S401, and in step S403, an unsigned integer 1 bit is allocated to distinguish between an inter-screen mode and an intra-screen mode of N × N prediction units. The inter-screen mode and the intra-screen mode of the N × N prediction unit are represented by a total of three bits, including one bit for notifying whether to divide or not, one bit for notifying the prediction mode, and one bit for notifying the prediction unit.

5 is a comparison table of the number of generated bits in the prediction unit classification method and the conventional prediction unit classification method using the prediction unit syntax system of the video codec according to the present invention, which can be distinguished with fewer bits than the conventional prediction unit classification method. When the prediction unit classification method according to the present invention is applied, the video encoder and the decoder can be further improved, and the present invention can be applied to all application fields in which the conventional video codec is used. You can enjoy the effect.

Although the embodiments of the present invention have been described above, the technical idea of the present invention is not limited to the above embodiments, and a prediction unit syntax system of various video codecs and a prediction unit classification method using the same in a range that does not depart from the technical idea of the present invention. Can be implemented.

10: segmentation notification unit 20: prediction mode notification unit
30: prediction unit notification unit 50: syntax system

Claims (14)

  1. A segmentation notifying unit which notifies whether a current prediction unit is divided when parsing the prediction unit bitstream;
    A prediction mode notification unit connected to the division whether or not to notify a prediction mode of a prediction unit;
    A prediction unit syntax system connected to the prediction mode notification unit, the prediction unit notification unit notifying a prediction unit of a prediction mode.
  2. The method of claim 1,
    The division notification unit,
    A prediction unit syntax system of a video codec, characterized by notifying whether or not to divide by assigning an unsigned integer 1 bit to a syntax element.
  3. The method of claim 1,
    The prediction mode notification unit,
    A prediction unit syntax system of a video codec, wherein a prediction mode is notified by allocating an unsigned integer 2 bits or an integer 1 bit to a syntax element according to whether to split.
  4. The method of claim 1,
    The prediction unit notification unit,
    A prediction unit syntax system of a video codec, characterized by examining a probability distribution for each prediction unit in an inter prediction mode, and determining and assigning an unsigned integer 2-bit or an unsigned integer exponential Golem code.
  5. Notifying whether the current prediction unit is divided by allocating an unsigned integer 1 bit to the syntax element by using the division notification unit;
    Using a prediction mode notification unit, allocating an unsigned integer 2 bits or an integer 1 bit to a syntax element according to whether to divide, and notifying the prediction mode; and
    Predicting the prediction unit by using a prediction unit notification unit to investigate a probability distribution for each prediction unit, allocating an unsigned integer 2-bit or an unsigned integer exponential golem code, and notifying the prediction unit Method of classifying prediction unit using syntax system.
  6. The method of claim 5,
    The notifying of the prediction mode may include:
    If not partitioned, 2 bits of unsigned integers are allocated to the syntax elements, and classified into direct mode, inter-screen mode, and intra-screen mode of 2N × 2N prediction unit.
    When divided, the prediction unit classification using the prediction unit syntax system of the video codec, which allocates one bit of an unsigned integer to a syntax element and divides it into an inter-screen mode and an intra-screen mode except the 2N × 2N prediction unit. Way.
  7. The method of claim 5,
    The notifying of the prediction mode may include:
    If not partitioned, two bits of unsigned integers are assigned to the syntax elements, and are divided into a direct mode and an inter-screen mode of a 2N × 2N prediction unit, and an intra-picture mode of an N × N prediction unit.
    When partitioned, the prediction unit syntax of the video codec is divided into an inter-screen mode excluding the 2N × 2N prediction unit and an intra-picture mode of 2N × 2N prediction unit by allocating an unsigned integer 1 bit to the syntax element. Method of classifying prediction unit using system.
  8. 8. The method according to claim 6 or 7,
    Undivided direct mode, inter-screen mode and in-screen mode are
    A prediction unit classification method using a prediction unit syntax system of a video codec, comprising 1 bit for notifying whether to be divided and 2 bits for notifying a prediction mode.
  9. 8. The method according to claim 6 or 7,
    The intra prediction mode of the divided 2N × 2N or N × N prediction unit is represented by a total of 2 bits, including 1 bit for notifying whether to be divided and 1 bit for notifying a prediction mode. Method of classifying prediction unit using syntax system.
  10. 8. The method according to claim 6 or 7,
    The notifying of the prediction unit may include:
    In split screen mode,
    Includes prediction units of 2N × N, N × 2N, and N × N,
    When assigning an unsigned integer exponential Golem code,
    The prediction unit of 2N × N is expressed as a total of 3 bits, including 1 bit for notifying whether to divide, 1 bit for notifying the prediction mode, and 1 bit for an integer exponential Golem code.
    The prediction unit of N × 2N is represented by a total of 5 bits, including 1 bit for notifying whether to divide, 1 bit for notifying the prediction mode, and 3 bits of an integer exponential Golem code.
    The prediction unit of N × N is represented by a total of 5 bits, including 1 bit for notifying whether to divide, 1 bit for notifying the prediction mode, and 3 bits of integer exponential Golem code.
    When allocating 2 bits of unsigned integer,
    The prediction units of 2xN, Nx2N, and NxN all have a total of 4, including 1 bit for notifying whether to divide, 1 bit for notifying the prediction mode, and 2 bits of integer exponential Gollum code. A prediction unit classification method using a prediction unit syntax system of a video codec, characterized in that it is expressed in bits.
  11. Firstly notifying whether the current prediction unit is divided by allocating an unsigned integer 1 bit to the syntax element by using the division notification unit;
    Notifying the primary prediction mode by allocating an unsigned integer 2 bits to the syntax element according to the primary partitioning notification using the prediction mode notification unit;
    Secondly notifying whether the current prediction unit is divided by allocating an unsigned integer 1 bit to the syntax element by using the division notification unit;
    Notifying the prediction unit by allocating an unsigned integer 1 bit to the syntax element according to the second division notification using the prediction unit notification unit; and
    And using the prediction mode notification unit, notifying the secondary prediction mode by allocating an unsigned integer 1 bit to the syntax element in accordance with the secondary partition presence notification, using the prediction unit syntax system of the video codec Predictive unit classification method.
  12. The method of claim 11,
    Notifying the first prediction mode
    In the first step of notifying whether the current prediction unit is divided, if not divided, two unsigned integers are allocated and divided into a direct mode, an inter-screen mode, and an intra-screen mode of a 2N × 2N prediction unit.
    The video codec of the video codec of claim 2, wherein the direct mode, the inter-screen mode, and the intra-screen mode of the 2N × 2N prediction unit are represented by a total of 3 bits, including 1 bit for notifying whether to be divided and 2 bits for notifying a prediction mode. Method of classifying prediction unit using prediction unit syntax system.
  13. The method of claim 11,
    The notifying of the prediction mode may include:
    In the step of notifying whether the primary partition is divided, in the step of notifying whether the current prediction unit is divided or not, in the step of notifying the partition, an unsigned integer 1 bit is allocated to predict 2N × N and N × 2N. It is divided into unit screen mode.
    The inter-screen mode of the 2N × N and N × 2N prediction units is represented by a total of 3 bits, including 1 bit for notifying whether to divide, 1 bit for notifying the prediction mode, and 1 bit for notifying the prediction unit. A prediction unit classification method using a prediction unit syntax system of a video codec.
  14. The method of claim 11,
    Notifying the second prediction mode may include:
    In the step of notifying whether or not the primary division is divided, and in the step of notifying whether or not the primary division is performed, an unsigned integer 1 bit is allocated to the inter-screen mode and the intra-screen mode of the N × N prediction unit. Distinguish,
    The inter-screen mode and the intra-screen mode of the N × N prediction unit are represented by a total of 3 bits, including 1 bit for notifying whether to divide, 1 bit for notifying the prediction mode, and 1 bit for notifying the prediction unit. A prediction unit classification method using a prediction unit syntax system of a video codec.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100072347A (en) * 2007-10-12 2010-06-30 콸콤 인코포레이티드 Layered encoded bitstream structure
KR20110025444A (en) * 2009-09-04 2011-03-10 삼성전자주식회사 Method and apparatus for generating bitstream based on syntax element

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100072347A (en) * 2007-10-12 2010-06-30 콸콤 인코포레이티드 Layered encoded bitstream structure
KR20110025444A (en) * 2009-09-04 2011-03-10 삼성전자주식회사 Method and apparatus for generating bitstream based on syntax element

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