Abstract: Methods and apparatuses for encoding or decoding 3D objects are provided. The 3D object having attribute values represented at a first bit-depth, modified attribute values are obtained for at least one subset of the attribute values, the modified attribute values being represented at a second bit-depth that is smaller than the first bit-depth, and metadata associated to the at least one subset of the attribute values are obtained, the metadata comprising an information representative of a modification applied to the attribute values of the at least one subset to obtain the modified attribute values at the second bit-depth. The modified attribute values and the metadata are encoded.

Abstract: At least one embodiment relates to a method comprising obtaining an occupancy information indicating if blocks of a 2D regular grid defined over a projection plane are associated with depth information of an orthogonal projection of at least one point of a point cloud onto said projection plane; embedding said occupancy information in an image storing said depth information; and encoding said image.

Abstract: At least one embodiment relates to a method comprising encoding a projection mode associated with an image region of a first depth image, said projection mode indicating if said image region stores either the minimum or the maximum depth value of at least one orthogonally projected 3D point of the point cloud along a same projection direction; and encoding said depth minimum and maximum depth values as a function of said projection mode.

Abstract: At least one embodiment relates to signaling at least one texture patch representing a texture value of at least one in-between 3D sample, a texture patch being a set of 2D samples representing texture values of orthogonally projected 3D samples of a point cloud along projection lines onto a projection plane, and said at least one in-between 3D sample being a 3D sample of the point cloud having a depth value greater than a nearer 3D sample of the point cloud and lower than a farther 3D sample of the point cloud, said at least one in-between 3D sample and said nearer and farther 3D samples being projected along the same projection line.

Abstract: At least one embodiment relates to a method for smoothing (filtering) the geometry of a point cloud frame by performing an analysis and filtering of said geometry point cloud in a 2D space, without reconstruction of 3D samples in a 3D space, and by using a flexible filtering operator that, in addition to moving existing points, can also remove points or add new ones.

Abstract: At least one embodiment relates to the transfer, between two processing units or memories, of a three-channels texture image and at least two image-structured data used for reconstructing the geometry of the point cloud. Such transfer comprises copying the three channels of the three-channels texture image into the three channels of a four-channels image, and storing, in the fourth channel of the four-channels image, a combined information obtained by combining altogether the at least two image-structured data. The four-channel image is then transferred.

Abstract: At least a method and an apparatus are presented for efficiently encoding or decoding video. For example, a 2-D patch of the point cloud is obtained by projecting 3-D points of the point cloud onto a projection plane, the patch having a plurality of pixels. The patch is divided into a plurality of smaller blocks. The number of pixels is determined within each of the plurality of smaller blocks. An updated occupancy map is obtained based on the determined number of pixels within each of the plurality of smaller blocks. A reconstructed point cloud is obtained based on the updated occupancy map, wherein the reconstructed point cloud is a less dense representation of the point cloud.

Abstract: The present embodiments relate to a method and device. The method comprises obtaining at least one first point from at least one point of a point cloud by projecting said point of the point cloud onto a projection plane and obtaining at least one other point of the point cloud determined according to said at least one first point; determining and encoding at least one interpolation coding mode for said at least one first point based on at least one reconstructed point obtained from said at least one first point and at least one interpolation point defined by said at least one interpolation coding mode to approximate said at least one other point of the point cloud; and signaling said at least interpolation coding mode as values of image data.

Abstract: Described are methods and devices for adding at least one 3D sample to a point cloud frame and for assigning a color-coding mode to said at least one 3D sample, said color-coding mode indicating if color information associated with said at least one 3D sample is explicitly encoded in a bitstream or if said color information is implicit.

Abstract: A method and apparatus of encoding/decoding attributes of points of a pint cloud are provided. The encoding method subdivides a bounding box bounding the points to be encoded, encodes data representative of attributes of a point by referring to a subdivision to which said point belongs to; and encode data representative of a number of points comprised in each subdivision.

Abstract: A system and method is provided for generating a tone mapping function to reduce dynamic range of a first image to produce a second image. A luma signal and a plurality of chroma components are determined and a gamut color correction is then performed. An adaptive function is generated by comparing the luma signal and at least one chroma component of the first and second image.

Abstract: At least one embodiment relates to provides a method of encoding/decoding attribute of orthogonally projected 3D samples and in-between 3D samples in which an information indicates whether at least one first attribute patch of 2D samples obtained by encoding the attribute of said at least one orthogonally projected 3D samples according to a first attribute coding mode, and at least one second attribute patch of 2D samples of an image obtained by encoding the attribute of at least one in-between 3D sample, are stored in separate images.

Abstract: A method and apparatus of encoding/decoding attributes of points of a pint cloud are provided. The encoding method subdivides a bounding box bounding the points to be encoded, encodes data representative of attributes of a point by referring to a subdivision to which said point belongs to; and encode data representative of a number of points comprised in each subdivision.

Abstract: At least one embodiment relates to a method for adding at least one 3D sample to a point cloud frame and for assigning a color-coding mode to said at least one 3D sample, said color-coding mode indicating if color information associated with said at least one 3D sample is explicitly encoded in a bitstream or if said color information is implicit.

Abstract: At least one embodiment relates to provides a method of encoding/decoding attribute of orthogonally projected 3D samples and in-between 3D samples in which an information indicates whether at least one first attribute patch of 2D samples obtained by encoding the attribute of said at least one orthogonally projected 3D samples according to a first attribute coding mode, and at least one second attribute patch of 2D samples of an image obtained by encoding the attribute of at least one in-between 3D sample, are stored in separate images.

Abstract: At least one embodiment relates to a method comprising encoding a projection mode associated with an image region of a first depth image, said projection mode indicating if said image region stores either the minimum or the maximum depth value of at least one orthogonally projected 3D point of the point cloud along a same projection direction; and encoding said depth minimum and maximum depth values as a function of said projection mode.

Abstract: A method, an apparatus for encoding at least one component of at least one attribute of an animated 3D object and a method and an apparatus for decoding at least one component of at least one attribute of an animated 3D object are disclosed. The at least one component of the at least one attribute of the animated 3D object is encoded by reframing values of the attributes into a first subset and a second subset, wherein the first subset of values comprises values of the at least one component being in a range of values, and the second subset of values comprising values of the at least one component being outside the range of values, and encoding the first subset and the second subset of values.

Abstract: At least one embodiment relates to a method comprising encoding a projection mode associated with an image region of a first depth image, said projection mode indicating if said image region stores either the minimum or the maximum depth value of at least one orthogonally projected 3D point of the point cloud along a same projection direction; and encoding said depth minimum and maximum depth values as a function of said projection mode.

Abstract: The present embodiments relate to a method and device. The method comprises obtaining at least one first point from at least one point of a point cloud by projecting said point of the point cloud onto a projection plane and obtaining at least one other point of the point cloud determined according to said at least one first point; determining and encoding at least one interpolation coding mode for said at least one first point based on at least one reconstructed point obtained from said at least one first point and at least one interpolation point defined by said at least one interpolation coding mode to approximate said at least one other point of the point cloud; and signaling said at least interpolation coding mode as values of image data.

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