JPWO2020190835A5 - - Google Patents
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- JPWO2020190835A5 JPWO2020190835A5 JP2021540213A JP2021540213A JPWO2020190835A5 JP WO2020190835 A5 JPWO2020190835 A5 JP WO2020190835A5 JP 2021540213 A JP2021540213 A JP 2021540213A JP 2021540213 A JP2021540213 A JP 2021540213A JP WO2020190835 A5 JPWO2020190835 A5 JP WO2020190835A5
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- 230000011664 signaling Effects 0.000 claims 6
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Description
幾つかの実施形態では、CUが暗黙的に複数のSTUに区分されている場合、MTSおよび/または変換スキップはシグナリングされない。 In some embodiments, MTS and/or translation skips are not signaled when a CU is implicitly partitioned into multiple STUs .
Claims (13)
前記デコーダの処理回路システムを介して、符号化された動画ビットストリームから変換ブロックシグナリング情報を取得するステップと、
前記デコーダの前記処理回路システムを介して、前記変換ブロックシグナリング情報に基づいて変換類型を特定するステップと、
前記デコーダの前記処理回路システムを介して、前記変換類型と、複数のサブ変換ユニットのうちの1つのサブ変換ユニットの隣接するサブ変換ユニットとに基づいて、前記複数のサブ変換ユニットのうちの前記1つのサブ変換ユニットの低周波数係数を特定するステップであって、前記複数のサブ変換ユニットは、現在の符号化ブロックユニット(CU)から区分されてなるステップと、
前記デコーダの前記処理回路システムを介して、複数のサブ変換ユニットの低周波数係数に基づいて、前記現在の符号化ブロックユニット(CU)を復号化するステップであって、前記低周波数係数は、前記複数のサブ変換ユニットのうちの前記1つのサブ変換ユニットの低周波数係数を含むステップと、を含む
ことを特徴とするデコーダにおける動画復号化方法。 A video decoding method for use in a decoder,
obtaining transform block signaling information from an encoded video bitstream via a processing circuitry system of the decoder;
identifying, via the processing circuitry of the decoder, a transform type based on the transform block signaling information;
Via the processing circuit system of the decoder, the one of the plurality of sub-transform units based on the transform type and an adjacent sub-transform unit of one sub-transform unit of the plurality of sub-transform units. identifying low frequency coefficients of one sub-transform unit, the plurality of sub-transform units partitioned from a current coded block unit (CU);
decoding, via the processing circuitry system of the decoder, the current coded block unit (CU) based on low frequency coefficients of a plurality of sub-transform units, the low frequency coefficients comprising: , including low frequency coefficients of said one sub-transform unit of said plurality of sub-transform units.
ことを特徴とする請求項1に記載の方法。 The step of identifying the low-frequency coefficients includes low-frequency coefficients of at least one of an upper adjacent sub-transform unit and a left adjacent sub-transform unit of one sub-transform unit among the plurality of sub-transform units. determining signed values of low-frequency coefficients of at least said one sub-transform unit of said plurality of sub-transform units based on an average value of signed values of described method.
前記変換類型が離散コサイン変換2(DCT-2)であることを示す第1の高レベル構文要素と、
前記変換類型がDCT-2または変換スキップであることを示す第2の高レベル構文要素と、
前記変換類型が離散コサイン変換8(DCT-8)と離散サイン変換7(DST-7)に基づく多重変換選択(MTS)であることを示す第3の高レベル構文要素と、
のうちの1つであることを特徴とする請求項1に記載の方法。 The transform block signaling information comprises:
a first high-level syntax element indicating that the transform type is a discrete cosine transform-2 (DCT-2);
a second high-level syntax element indicating that the transform type is DCT-2 or transform skip;
a third high-level syntax element indicating that the transform type is Multiple Transform Selection (MTS) based on Discrete Cosine Transform 8 (DCT-8) and Discrete Sine Transform 7 (DST-7);
2. The method of claim 1, wherein one of:
ことを特徴とする請求項1に記載の方法。 Multiple transform selection (MTS) and/or transform skip are included in the transform block signaling information if the multiple sub-transform units are partitioned from the current coding block unit (CU) by implicit transform partitioning. not
2. The method of claim 1, wherein:
前記複数のサブ変換ユニットのうちの1つのサブ変換ユニットの隣接するサブ変換ユニットの変換係数に基づいて、前記複数のサブ変換ユニットのうちの前記1つのサブ変換ユニットの低周波数係数の絶対値を特定するステップを含む
ことを特徴とする請求項1~3の何れか1項に記載の方法。 The step of identifying the low frequency coefficients comprises:
absolute values of low frequency coefficients of the one sub transform unit of the plurality of sub transform units based on transform coefficients of adjacent sub transform units of the one sub transform unit of the plurality of sub transform units; A method according to any one of claims 1 to 3, characterized in that it comprises the step of identifying
をさらに含む
ことを特徴とする請求項5に記載の方法。 Based on an average value of absolute values of low-frequency coefficients of at least one of the upper adjacent sub-transform unit and the left adjacent sub-transform unit of one sub-transform unit among the plurality of sub-transform units, 6. The method of claim 5, further comprising identifying absolute values of low frequency coefficients of the one sub-transform unit of a plurality of sub-transform units.
ことを特徴とする請求項5に記載の方法。 transforming the one sub transform unit of the plurality of sub transform units and a sub transform unit adjacent to the one sub transform unit of the plurality of sub transform units based on different transform types; 6. The method of claim 5, scaling absolute values of low frequency coefficients of the neighboring sub-transform units in response to .
ことを特徴とする請求項5に記載の方法。 6. The method of claim 5, partitioning the plurality of sub-transform units from the current coded block unit based on at least one of an intra sub-partitioning mode and an implicit transform partition.
複数の変換係数を得るように前記複数のサブ変換ユニットの低周波数係数を二次変換するステップであって、前記複数の変換係数のそれぞれは、前記複数のサブ変換ユニットのそれぞれに対応する低周波数係数に基づいて得られたものであるステップをさらに含み、
前記の復号化するステップは、前記複数の変換係数に基づいて前記現在の符号化ブロックユニットを復号化するステップをさらに含む
ことを特徴とする請求項1~7の何れか1項に記載の方法。 After identifying the low frequency coefficients of the one sub-transform unit of the plurality of sub-transform units, the following steps:
secondarily transforming the low frequency coefficients of the plurality of sub-transform units to obtain a plurality of transform coefficients, each of the plurality of transform coefficients being a low frequency corresponding to each of the plurality of sub-transform units. is obtained based on the coefficient,
A method according to any preceding claim, wherein said decoding step further comprises decoding said current coded block unit based on said plurality of transform coefficients. .
ことを特徴とする請求項9に記載の方法。 wherein the secondary transform is one of non-square Hadamard transform, square Hadamard transform, DCT-2, DST-7, DCT-8, Karhunen-Loeve transform (KLT) and non-separable KLT. 10. The method of claim 9, wherein
ことを特徴とする請求項9に記載の方法。 10. The method of claim 9, performing the secondary transform in response to the plurality of sub-transform units in the current coded block unit (CU) sharing the same transform type.
コンピュータに
符号化された動画ビットストリームから変換ブロックシグナリング情報を取得するステップと、
前記変換ブロックシグナリング情報に基づいて変換類型を特定するステップと、
前記変換類型と、複数のサブ変換ユニットのうちの1つのサブ変換ユニットのSTUとに基づいて、前記複数のサブ変換ユニットのうちの前記1つのサブ変換ユニットの低周波数係数を特定するステップであって、前記複数のサブ変換ユニットは、現在の符号化ブロックユニット(CU)から区分されてなるステップと、
前記複数のサブ変換ユニットの低周波数係数に基づいて、前記現在の符号化ブロックユニットを復号化するステップであって、前記低周波数係数は、前記複数のサブ変換ユニットのうちの前記1つのサブ変換ユニットの低周波数係数を含むステップと、を実行させ、
前記低周波数係数を特定するステップは、前記複数のサブ変換ユニットのうちの1つのサブ変換ユニットの上側の隣接するサブ変換ユニットおよび左側の隣接するサブ変換ユニットのうちの少なくとも一方の低周波数係数の符号付き値の平均値に基づいて、少なくとも前記複数のサブ変換ユニットのうちの前記1つのサブ変換ユニットの低周波数係数の符号付き値を特定するステップを特定する
ことを特徴とするコンピュータプログラム。 A computer program stored on a non-transitory computer-readable medium,
obtaining transform block signaling information from a computer encoded video bitstream;
identifying a transform type based on the transform block signaling information;
identifying low frequency coefficients of the one sub transform unit of the plurality of sub transform units based on the transform type and the STU of the one sub transform unit of the plurality of sub transform units; wherein the plurality of sub-transform units are partitioned from a current coded block unit (CU);
decoding the current coded block unit based on low-frequency coefficients of the plurality of sub-transform units, wherein the low-frequency coefficients are derived from the one of the plurality of sub-transform units; including the low frequency coefficients of the sub-transform unit;
The step of identifying the low-frequency coefficients includes low-frequency coefficients of at least one of an upper adjacent sub-transform unit and a left adjacent sub-transform unit of one sub-transform unit among the plurality of sub-transform units. identifying signed values for low-frequency coefficients of at least one of the plurality of sub-transform units based on an average signed value of .
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US62/819,568 | 2019-03-16 | ||
US16/819,085 US11025937B2 (en) | 2019-03-16 | 2020-03-14 | Method and apparatus for video coding |
US16/819,085 | 2020-03-14 | ||
PCT/US2020/022897 WO2020190835A1 (en) | 2019-03-16 | 2020-03-16 | Method and apparatus for video coding |
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US6282322B1 (en) * | 1998-12-03 | 2001-08-28 | Philips Electronics North America Corp. | System and method for compressing and decompressing images |
KR101108681B1 (en) * | 2005-01-19 | 2012-01-25 | 삼성전자주식회사 | Frequency transform coefficient prediction method and apparatus in video codec, and video encoder and decoder therewith |
JP4502203B2 (en) | 2005-03-17 | 2010-07-14 | ルネサスエレクトロニクス株式会社 | Image encoding apparatus and image decoding apparatus |
US9635368B2 (en) * | 2009-06-07 | 2017-04-25 | Lg Electronics Inc. | Method and apparatus for decoding a video signal |
US20110090952A1 (en) * | 2009-10-21 | 2011-04-21 | Cohen Robert A | Directional Transforms for Video and Image Coding |
KR101483179B1 (en) | 2010-10-06 | 2015-01-19 | 에스케이 텔레콤주식회사 | Frequency Transform Block Coding Method and Apparatus and Image Encoding/Decoding Method and Apparatus Using Same |
US10499059B2 (en) | 2011-03-08 | 2019-12-03 | Velos Media, Llc | Coding of transform coefficients for video coding |
US9253481B2 (en) * | 2012-01-13 | 2016-02-02 | Qualcomm Incorporated | Determining contexts for coding transform coefficient data in video coding |
US10306229B2 (en) * | 2015-01-26 | 2019-05-28 | Qualcomm Incorporated | Enhanced multiple transforms for prediction residual |
US10491922B2 (en) * | 2015-09-29 | 2019-11-26 | Qualcomm Incorporated | Non-separable secondary transform for video coding |
WO2017057953A1 (en) | 2015-09-30 | 2017-04-06 | 엘지전자 주식회사 | Method and device for coding residual signal in video coding system |
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US10972733B2 (en) * | 2016-07-15 | 2021-04-06 | Qualcomm Incorporated | Look-up table for enhanced multiple transform |
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