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公开(公告)号:AU2018204551B2
公开(公告)日:2020-03-19
申请号:AU2018204551
申请日:2018-06-22
Applicant: APPLE INC
Inventor: TOURAPIS ALEXANDROS
IPC: H04N19/186 , H04N19/44 , H04N19/463 , H04N19/70 , H04N19/82 , H04N19/86
Abstract: Offset values, such as Sample Adaptive Offset (SAO) values in video coding standards such as the High Efficiency Video Coding standard (HEVC), may be improved by performing calculations and operations that improve the preciseness of these values without materially affecting the signal overhead needed to transmit the more precise values. Such calculations and operations may include applying a quantization factor to a video sample and at least some of its neighbors, comparing the quantized values, and classifying the video sample as a minimum, maximum, or one of various types of edges based on the comparison. Other sample range, offset mode, and/or offset precision parameters may be calculated and transmitted with metadata to improve the precision of offset values.
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公开(公告)号:RU2709797C1
公开(公告)日:2019-12-20
申请号:RU2019118483
申请日:2019-06-14
Applicant: APPLE INC
Inventor: TOURAPIS ALEXANDROS , COTE GUY
IPC: H04N19/124 , H04N19/186
Abstract: Изобретениеотноситсяк кодированию/декодированиювидеосигналов. Техническийрезультат - расширениеарсеналатехническихсредствквантованияцветностидлясигнализациидополнительныхзначенийсдвигапараметраквантования (QP) цветности. Предложенспособсигнализациидополнительныхзначенийсдвига QP цветности, которыеявляютсяконкретнымидлягруппквантования, причемкаждаягруппаквантованияявнозадаетсвойсобственныйнаборзначенийсдвига QP цветности. Альтернативно, задаюттаблицувозможныхнаборовзначенийсдвига QP цветностив областизаголовкаизображения, икаждаягруппаквантованияиспользуетиндексдлявыборазаписиизтаблицы, дляопределениясвоегособственногонаборазначенийсдвига QP цветности. Конкретныезначениясдвига QP цветностигруппыквантованиязатемиспользуютдляопределениязначений QP цветностидляблоковв пределахгруппыквантования, дополнительнок значениямсдвига QP цветности, ужезаданнымдляболеевысокихуровнейиерархиикодированиявидеосигналов. 17 з.п. ф-лы, 22 ил.
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公开(公告)号:AU2016200770A1
公开(公告)日:2016-02-25
申请号:AU2016200770
申请日:2016-02-05
Applicant: APPLE INC
Inventor: TOURAPIS ALEXANDROS , COTE GUY
IPC: H04N19/124
Abstract: A method of signaling additional chroma QP offset values that are specific to quantization groups is provided, in which each quantization group explicitly specifies its own set of chroma QP offset values. Alternatively, a table of possible sets of chroma QP offset values is specified in the header area of the picture, and each quantization group uses an index to select an entry from the table for determining its own set of chroma QP offset values. The quantization group specific chroma QP offset values are then used to determine the chroma QP values for blocks within the quantization group in addition to chroma QP offset values already specified for higher levels of the video coding hierarchy.
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公开(公告)号:AU2023202567B2
公开(公告)日:2023-11-16
申请号:AU2023202567
申请日:2023-04-27
Applicant: APPLE INC
Inventor: TOURAPIS ALEXANDROS , COTE GUY
IPC: H04N19/124
Abstract: A method of signaling additional chroma QP offset values that are specific to quantization groups is provided, in which each quantization group explicitly specifies its own set of chroma QP offset values. Alternatively, a table of possible sets of chroma QP offset values is specified in the header area of the picture, and each quantization group uses an index to select an entry from the table for determining its own set of chroma QP offset values. The quantization group specific chroma QP offset values are then used to determine the chroma QP values for blocks within the quantization group in addition to chroma QP offset values already specified for higher levels of the video coding hierarchy.
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公开(公告)号:AU2023202567A1
公开(公告)日:2023-05-18
申请号:AU2023202567
申请日:2023-04-27
Applicant: APPLE INC
Inventor: TOURAPIS ALEXANDROS , COTE GUY
IPC: H04N19/124
Abstract: A method of signaling additional chroma QP offset values that are specific to quantization groups is provided, in which each quantization group explicitly specifies its own set of chroma QP offset values. Alternatively, a table of possible sets of chroma QP offset values is specified in the header area of the picture, and each quantization group uses an index to select an entry from the table for determining its own set of chroma QP offset values. The quantization group specific chroma QP offset values are then used to determine the chroma QP values for blocks within the quantization group in addition to chroma QP offset values already specified for higher levels of the video coding hierarchy.
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公开(公告)号:AU2021201660A1
公开(公告)日:2021-04-08
申请号:AU2021201660
申请日:2021-03-16
Applicant: APPLE INC
Inventor: TOURAPIS ALEXANDROS
IPC: H04N19/122 , H04N19/186 , H04N19/196 , H04N19/46
Abstract: A method for video encoding comprising: generating residual image data for a current image area by integrating a predicted image data with source image data, wherein the current image area is a transform unit (TU); performing a selected color transform on the residual image data to produce transformed residual image data; encoding the transformed residual image data into an encoded bitstream including an indication of the selected color transform in a TU syntax element within the encoded bitstream.
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公开(公告)号:AU2019253875B2
公开(公告)日:2020-12-17
申请号:AU2019253875
申请日:2019-10-24
Applicant: APPLE INC
Inventor: TOURAPIS ALEXANDROS
IPC: H04N19/122 , H04N19/186 , H04N19/196 , H04N19/46
Abstract: A method for video encoding comprising: generating residual image data for a current image area by integrating a predicted image data with source image data, wherein the current image area is a transform unit (TU); performing a selected color transform on the residual image data to produce transformed residual image data; encoding the transformed residual image data into an encoded bitstream including an indication of the selected color transform in a TU syntax element within the encoded bitstream.
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公开(公告)号:DE112018005250T5
公开(公告)日:2020-06-18
申请号:DE112018005250
申请日:2018-09-18
Applicant: APPLE INC
Inventor: MAMMOU KHALED , ROBINET FABRICE A , TOURAPIS ALEXANDROS , SU YEPING
Abstract: Ein System umfasst einen Codierer, der konfiguriert ist, um Attributinformationen und/oder räumliche Informationen für eine Punktwolke zu komprimieren, und/oder einen Decoder, der konfiguriert ist, komprimierte Attribut- und/oder räumliche Informationen für die Punktwolke zu dekomprimieren. Um die Attribute und/oder die räumlichen Informationen zu komprimieren, ist der Codierer konfiguriert, um eine Punktwolke in eine bildbasierte Darstellung umzuwandeln. Außerdem ist der Decoder konfiguriert, um eine dekomprimierte Punktwolke basierend auf einem Bild auf der Grundlage der Darstellung einer Punktewolke zu erzeugen.
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公开(公告)号:DE112018004878T5
公开(公告)日:2020-06-18
申请号:DE112018004878
申请日:2018-09-05
Applicant: APPLE INC
Inventor: MAMMOU KHALED , ROBINET FABRICE A , GREMASCHI ANDREA , TOURAPIS ALEXANDROS
IPC: G06T17/00 , H04N19/132 , H04N19/33 , H04N19/426
Abstract: Ein System umfasst einen Codierer, der ausgelegt ist, um eine Punktwolke zu komprimieren, die eine Vielzahl von Punkten umfasst, wobei jeder Punkt räumliche Informationen für den Punkt umfasst. Der Codierer ist so ausgelegt, dass er die Punkte unterabtastet und Unterteilungsstellen für die unterabgetasteten Punkte bestimmt. Der Codierer ist auch ausgelegt, um für die jeweilige Unterteilungsstelle zu bestimmen, ob ein Punkt aufgenommen, nicht aufgenommen oder relativ zu der Unterteilungsstelle versetzt werden soll. Der Codierer codiert die räumlichen Informationen für die unterabgetasteten Punkte und codiert die Aufnahme-/Versetzungsinformationen des Unterteilungsstellenpunktes, um eine komprimierte Punktwolke zu erzeugen. Ein Decodierer erzeugt eine ursprüngliche oder nahezu Replik einer ursprünglichen Punktwolke basierend auf räumlichen Informationen und den in der komprimierten Punktwolke enthaltenen Aufnahme-/Versetzungsinformationen der Unterteilungsstelle.
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公开(公告)号:AU2020202363A1
公开(公告)日:2020-04-30
申请号:AU2020202363
申请日:2020-04-03
Applicant: APPLE INC
Inventor: TOURAPIS ALEXANDROS , COTE GUY
IPC: H04N19/124
Abstract: A method of signaling additional chroma QP offset values that are specific to quantization groups is provided, in which each quantization group explicitly specifies its own set of chroma QP offset values. Alternatively, a table of possible sets of chroma QP offset values is specified in the header area of the picture, and each quantization group uses an index to select an entry from the table for determining its own set of chroma QP offset values. The quantization group specific chroma QP offset values are then used to determine the chroma QP values for blocks within the quantization group in addition to chroma QP offset values already specified for higher levels of the video coding hierarchy.
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