公开(公告)号：US11769275B2

公开(公告)日：2023-09-26

申请号：US16755635

申请日：2018-10-11

Applicant: InterDigital VC Holdings, Inc.

Inventor： Sebastien Lasserre ,  Saurabh Puri ,  Kangying Cai ,  Julien Ricard ,  Celine Guede

IPC: G06T9/00 ,  G06F17/16 ,  G06T3/00

CPC classification number: G06T9/00 ,  G06F17/16 ,  G06T3/0006

Abstract: This method for inter-predictive encoding of a time-varying 3D point cloud including a series of successive frames divided in 3D blocks into at least one bitstream comprises encoding (20) 3D motion information including a geometric transformation comprising rotation information representative of a rotation transformation and translation information representative of a translation transformation, wherein the translation information comprises a vector ΔT representing an estimation error of the translation transformation.

公开(公告)号：US11490104B2

公开(公告)日：2022-11-01

申请号：US16311414

申请日：2017-06-27

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Sebastien Lasserre ,  Pierre Andrivon ,  Philippe Bordes

IPC: H04N19/129 ,  H04N19/64 ,  H04N19/46 ,  G06F17/18

Abstract: Significance flags in advanced video compression systems are coded using contexts adaptive to the last N significance flags coded taken in a scanning order. One embodiment uses the last N significance flags in scanning order as a predictor to determine which of a plurality of sets of significance flag contexts to use for coding subsequent significance flags. A second embodiment uses the last N significance flags in scanning order as a predictor in order to modulate the probability value associated with significance flag contexts that are used to code significance flags for future coding.

公开(公告)号：US11348260B2

公开(公告)日：2022-05-31

申请号：US16624639

申请日：2018-06-18

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Kangying Cai ,  Sebastien Lasserre

IPC: G06T7/50 ,  G06T7/10 ,  G06T9/00 ,  G06T11/00 ,  G06T17/20

Abstract: This method for encoding a 3D point cloud comprises: —segmenting the point cloud into first patches (2); —determining inverse projection parameters of the patches (4); —projecting the first patches to planes using the inverse projection parameters (10); —encoding the planes (12); —determining sparse points in the point cloud not belonging to any patch (HC, 18); and—encoding the sparse points using an octree-decomposition (20).

公开(公告)号：US10666990B2

公开(公告)日：2020-05-26

申请号：US15546646

申请日：2016-01-28

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Sebastien Lasserre ,  Fabrice Leleannec ,  David Touze

IPC: G06K9/00 ,  H04N19/98 ,  H04N19/186 ,  H04N19/85 ,  H04N19/117

Abstract: A method is disclosed that comprises mapping a high-dynamic range luminance picture to a standard-dynamic range luminance picture based on a backlight value Bac associated with the high-dynamic range luminance picture.

公开(公告)号：US10574987B2

公开(公告)日：2020-02-25

申请号：US15106242

申请日：2014-12-15

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Sebastien Lasserre ,  Fabrice Le Leannec ,  David Touze

IPC: H04N19/124 ,  H04N19/154 ,  H04N19/164 ,  H04N19/176 ,  H04N19/186 ,  H04N19/36 ,  H04N19/33

Abstract: The present disclosure generally relates to a method and device for encoding an image block, characterized in that it comprises: obtaining (101) a low-spatial-frequency version (Llƒ) of a luminance component of the image block, said the obtained luminance component of the image block; obtaining a quantized luminance component (Llƒ,Q) of the image block by quantizing (102) the obtained luminance component (Llƒ) of the image block; obtaining (103) a differential luminance component (Lr) by calculating the difference between the luminance component (L) of the image block and either the quantized luminance component (Llƒ,Q) of the image block or a decoded version (Llƒ,Q) of the encoded quantized luminance component of the image block; encoding (104) the quantized luminance component (Llƒ,Q of the image block using at least one frequency coefficient of a set of frequency coefficients which is usually obtained from a block-based spatial-to-frequency transform for encoding the luminance component of the image block; and encoding (105) the differential luminance component (Lr) using the remaining frequency coefficients of said set of frequency coefficients.

公开(公告)号：US10360666B2

公开(公告)日：2019-07-23

申请号：US15666747

申请日：2016-01-26

Applicant: InterDigital VC Holdings, Inc.

Inventor： Sebastien Lasserre ,  Fabrice Leleannec ,  Philippe Bordes

IPC: G06T5/00 ,  G06T5/40

Abstract: An input HDR image may be represented using an SDR image and a modulation value. For the SDR image to be viewable and representative of the HDR image, we propose a mid-tone optimization technique to calculate the modulation value. In particular, we use two conditions when deriving the modulation value: (1) the blacks are not clipped down to zero too aggressively; and (2) the number of codewords in the SDR image used to represent the mid-tone range of the HDR image is maximized. The modulation value can further be clipped to avoid over-shooting in both very dark images and very bright images. Temporal stabilization can also be used to smooth temporal variations of the luminosity in the SDR video. After the modulation value is determined, the SDR image can be obtained based on the HDR image and the modulation value.

公开(公告)号：US11830210B2

公开(公告)日：2023-11-28

申请号：US16753787

申请日：2018-10-03

Applicant: InterDigital VC Holdings, Inc.

Inventor： Sebastien Lasserre ,  Julien Ricard ,  Remi Jullian

IPC: G06T15/20 ,  G06T17/00 ,  G06T7/529

CPC classification number: G06T7/529 ,  G06T15/205 ,  G06T17/00 ,  G06T2207/10028

Abstract: A method and device for generating points of a 3D scene from a depth image. To reach that aim, depth information associated with a current pixel is compared with depth information associated with pixels spatially adjacent to the current pixel in the depth image. When the difference of depth between the current pixel and an adjacent pixel is greater than a first value and less than a second value, at least an additional point of said 3D scene is generated, in addition to a current point associated with the current pixel of the depth image, the number of additional points depending on the depth difference.

公开(公告)号：US11647213B2

公开(公告)日：2023-05-09

申请号：US17700284

申请日：2022-03-21

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Sebastien Lasserre ,  Fabrice Leleannec ,  Yannick Olivier

IPC: H04N19/44 ,  H04N19/30 ,  H04N19/136 ,  H04N19/186 ,  H04N19/126 ,  H04N19/98

CPC classification number: H04N19/44 ,  H04N19/126 ,  H04N19/136 ,  H04N19/186 ,  H04N19/30 ,  H04N19/98

Abstract: The present disclosure generally relates to a device and a method of decoding a color picture from a bitstream. It comprises:



obtaining an expanded range luminance as a first component by applying a nonlinear dynamic expansion function to a luminance component obtained from the bitstream, wherein said nonlinear dynamic expansion function is determined depending on an inverse of a dynamic reduction function that has been applied to an original luminance component obtained when encoding the color picture;
obtaining a second component by calculating a square root of a difference between a value determined by the first component and another value computed as a linear combination of a multiplication product of two chrominance components and square values of the two chrominance components obtained from the bitstream, and
obtaining at least one color component of the color picture to be decoded at least from said second component and said two chrominance components by determining said at least one color component as a linear combination of the second component and the two chrominance components.

公开(公告)号：US10964066B2

公开(公告)日：2021-03-30

申请号：US16153719

申请日：2018-10-06

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Sebastien Lasserre ,  Julien Ricard ,  Yannick Olivier

IPC: G06T9/00 ,  G06T17/00 ,  G06T15/04 ,  G06T15/08 ,  G06T7/50

Abstract: A colored three-dimensional point cloud is encoded in at least two depth and texture images. The proposed method and device use inverse project pixels of the first image and inverse project pixels to the second image. When the inverse projecting of a first pixel of the first image and the inverse projecting of a second pixel of the second image refer to a common generated point, that is two 3D points closer to each other than the imprecision due to the encoding and compression of the images, the color value of the pixel of first and second pixels having the lowest local depth variance is attributed to the common generated point.

公开(公告)号：US10757427B2

公开(公告)日：2020-08-25

申请号：US15735174

申请日：2016-06-07

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Fabrice Leleannec ,  Sebastien Lasserre ,  Yannick Olivier ,  David Touze ,  Patrick Lopez

IPC: G06K9/00 ,  H04N19/186 ,  H04N19/40 ,  H04N19/593 ,  H04N19/44

Abstract: The present disclosure generally relates to a method and device for obtaining three color difference components from three components C1, C2 and C3 representing colors picture data in an input color space, a first of said color difference components being defined from the component C1, a second of said color difference components being defined from the first color difference component and the component C2, and a third of said color difference components being defined from the first color difference component and the component C3. The method is characterized in that it further comprises: —obtaining a first component by applying a process to the component C1; —obtaining said first color difference component by applying the inverse process to the first component.