Abstract: Apparatuses and methods for encoding or decoding picture information that involve determining a scaling factor to scale a chroma prediction residual associated with chroma information included in the picture information; scaling the chroma prediction residual based on the scaling factor to provide a scaled chroma prediction residual; and encoding or decoding at least a portion of the picture information based on the scaled chroma prediction residual.

Abstract: Encoding or decoding picture information can involve determining a first scaling factor varying with a first granularity to scale a chroma prediction residual associated with chroma information included in the picture information; determining a second scaling factor varying with a second granularity finer than the first granularity; scaling the chroma prediction residual based on a combination of the first scaling factor and the second scaling factor to provide a scaled chroma prediction residual with the second granularity; and encoding or decoding at least a portion of the picture information based on the scaled chroma prediction residual.

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.

Abstract: Encoding or decoding picture information can involve determining a first scaling factor varying with a first granularity to scale a chroma prediction residual associated with chroma information included in the picture information; determining a second scaling factor varying with a second granularity finer than the first granularity; scaling the chroma prediction residual based on a combination of the first scaling factor and the second scaling factor to provide a scaled chroma prediction residual with the second granularity; and encoding or decoding at least a portion of the picture information based on the scaled chroma prediction residual.

Abstract: The present principles relate to a method and device for encoding the geometry of a point cloud representing a 3D object. The method comprises: a) obtaining (210) at least one candidate octree-based structure (Ok) with a maximum depth level (?k) from the points of said point cloud, each candidate octree-based structure (Ok) approximating the geometry of the point cloud by points associated with leaf cubes, each leaf cube being associated with a leaf node of said candidate octree-based structure (Ok); b) obtaining (230) a coding cost (Ck) for said at least one candidate octree-based structure (Ok) with a maximum depth level (?k); c) encoding (250) an optimal octree-based structure (Oopt) with a maximum depth level (?opt) obtained by optimizing (240) said coding cost obtained for said at least one candidate octree-based structure (Ok); and d) encoding (260) a depth information data (DIDopt) representative of the maximum depth level (?opt) of said optimal octree-based structure (Oopt).