Abstract: Disclosed is a method, implemented by a calculation unit, for estimating a depth map from a digital hologram representing a scene, the method including: reconstructing, using the digital hologram, of n images of the scene, each associated with a depth of the scene and including multiple pixels, each image being defined by a same window; for each image, forming thumbnails composed of contiguous pixels and associated with two-dimensional regions of the window; applying an operator to each thumbnail of each image associated with a depth to provide a metric per thumbnail and by depth; determining a depth associated with each region two-dimensional based at least on the metrics relating to the thumbnails associated with the two-dimensional region concerned; determining the depth of a pixel of the depth map by selecting the depth having a maximum repetition number in the two-dimensional regions including the pixel concerned.

Abstract: Disclosed is a method for encoding data corresponding to a video sequence, into a spatial resolution scalable binary flow, including a base layer and enhancement layer. The method includes, for a frame of the sequence: obtaining, from the frame, a first frame, partitioning the first frame into blocks, each block having a given size, and encoding a block of the first frame to generate the base layer; obtaining, from the frame, a second frame; partitioning the second frame into blocks by inferring the initial size of a block from the size of a corresponding block in the first frame, the block of the second frame having an initial spatial resolution; determining a spatial encoding resolution associated with the block from a set of predetermined spatial resolutions; and coding data representative of the at block, based on the determined spatial encoding resolution, to generate an enhancement layer.

Abstract: A method for digitally generating a hologram plane from a three-dimensional scene, cut into a plurality of planes parallel to the hologram plane. The method includes for a current plane: counting a number of points of the non-zero amplitude scene; choosing a first or second technique for propagating a light wave emitted by the current plane as a function of a number of points of non-zero amplitude included in the current plane and with a preset threshold value, the first, point-based technique calculating the propagation of a sum of light waves emitted by point sources constituted by the points of the scene portion of a non-zero amplitude of the current plane on a following plane, and the second, field-based technique, globally calculating a light wave emitted by the scene portion situated in the current plane on a given plane; and processing the current plane according to the chosen propagation technique.

Abstract: A method for digitally generating a hologram plane from a three-dimensional scene, cut into a plurality of planes parallel to the hologram plane. The method includes for a current plane: counting a number of points of the non-zero amplitude scene; choosing a first or second technique for propagating a light wave emitted by the current plane as a function of a number of points of non-zero amplitude included in the current plane and with a preset threshold value, the first, point-based technique calculating the propagation of a sum of light waves emitted by point sources constituted by the points of the scene portion of a non-zero amplitude of the current plane on a following plane, and the second, field-based technique, globally calculating a light wave emitted by the scene portion situated in the current plane on a given plane; and processing the current plane according to the chosen propagation technique.

Abstract: The invention relates to a method for modeling a scene from a plurality of maps representative of depth, each map representative of depth being associated with a view of the said scene according to a particular viewpoint, To optimize the fidelity and precision of the scene modeling, the method comprises the following steps: generating, for each map representative of depth, a surface representative of the said depth map in world space; estimating a volume bounding all surfaces generated, the said bounding volume being discretised into a plurality of voxels; associating attributes representative of transparency with the said voxels of the bounding volume; and generating a resulting surface according to the attributes representative of transparency associated with the said voxels. The invention also relates to a device for processing the data representative of the corresponding depth.

Abstract: A method for generating a motion field between a current frame and a reference frame belonging to a video sequence from an input set of motion fields is disclosed. An motion field is associated to an ordered pair of frames comprises for a group of pixels belonging to a first frame of the ordered pair of frames, a motion vector computed from a location of the pixel in the first frame to an endpoint in a second frame of the ordered pair of frames. The method comprises determining a plurality of motion paths from a current frame to a reference frame wherein a motion path comprises a random sequence of N ordered pairs of frames associated to the input set of motion fields; N is an integer.

Abstract: A method for texturing a mesh associated with a surface representative of a scene captured in a plurality of images, wherein at least a mesh element of the mesh is at least partially visible from at least two first images of the plurality of images. As to reduce the amount of texture information associated with multi-views data representative of the scene, the method comprises for each first image (110 to 140), association of a first texture information with the mesh element, projection of the first texture information in the at least two first images, for each first texture information, estimation of an error information according to a comparison result between the projected first texture information and the texture information of said at least two first images, and selection of one of the at least two first texture information according to the error information.