Abstract: Predicting a component of a current pixel belonging to a current sub-aperture image in a matrix of sub-aperture images captured by a sensor of a type I plenoptic camera can involve, first, determining a location on the sensor based on: a distance from an exit pupil of a main lens of the camera to a micro-lens array of the camera; a focal length of the main lens; a focal length of the micro-lenses of the micro-lens array; and a set of parameters of a model of the camera allowing for a derivation of a two-plane parameterization describing the field of rays corresponding to the pixels of the sensor; and, second, predicting the component based on one reference pixel belonging to a reference sub-aperture image in the matrix and located on the sensor in a neighborhood of the location.

Abstract: METHOD AND A DEVICE FOR RECONSTRUCTINGA POINT CLOUD REPRESENTATIVE OF A SCENE USING LIGHT-FIELD DATA The present invention relates to the reconstruction of point cloud representing a scene. Point cloud data take up large amounts of storage space which makes storage cumbersome and processing less efficient. To this end, it is proposed a method for encoding a signal representative of a scene comprising parameters representing the rays of light sensed by the different pixels of the sensor are mapped on the sensor. A second set of encoded parameters are used to reconstruct the light-field content from the parameters representing the rays of light sensed by the different pixels of the sensor, a third set of parameters representing the depth an intersection of said ray of light represented by said first set of parameters with at least an object of said scene and a fourth set of parameters representing color data are used to reconstruct the point cloud on the receiver side.

Abstract: The invention relates to layered depth data. In multi-view images, there is a large amount of redundancy between images. Layered Depth Video format is a well-known formatting solution for formatting multi-view images which reduces the amount of redundant information between images. In LDV, a reference central image is selected and information brought by other images of the multi-view images that are mainly regions occluded in the central image are provided. However, LDV format contains a single horizontal occlusion layer, and thus fails rendering viewpoints that uncover multiple layers dis-occlusions. The invention uses light filed content which offers disparities in every directions and enables a change in viewpoint in a plurality of directions distinct from the viewing direction of the considered image enabling to render viewpoints that may uncover multiple layer dis-occlusions which may occurs with complex scenes viewed with wide inter-axial distance.

Abstract: There are several types of plenoptic devices having their proprietary file format. At present there is no standard supporting the acquisition and transmission of multi-dimensional information for an exhaustive over-view of the different parameters upon which a light-field depends. As such acquired light-field data for different cameras have a diversity of formats. The notion of pixel beam, which represents a volume occupied by a set of rays of light in an object space of an optical system of a camera is thus introduced. The method according to the invention enables to provide data representative of a collection of pixel beams describing a first optical system that is agnostic since these data are obtained by imaging the collection of pixel beams through a second optical system. Such data representative of a collection of pixel beams enable the generation of parameterized output images from which post-processing.

Abstract: The disclosure pertains a method for determining a rendered tridimensional content intended to a viewer. The method includes inputting a reference content comprising at least a reference view, inputting at least one information related to the viewer's eyes orientation relatively to a reference axis of a display device, and determining a rendered view as a function of the reference view, and the information related to the viewer's eyes orientation relatively to the reference axis of the display device.

Abstract: There are several types of plenoptic devices having their proprietary file format. At present there is no standard supporting the acquisition and transmission of multidimensional information for an exhaustive over-view of the different parameters upon which a light-field depends. As such acquired light-field data for different cameras have a diversity of formats. The notion of pixel beam, which represents a volume occupied by a set of rays of light in an object space of an optical system of a camera is thus introduced. The method according to the invention enables to provide data representative of a collection of pixel beams describing a first optical system that is agnostic since these data are obtained by imaging the collection of pixel beams through a second optical system. Such data representative of a collection of pixel beams enable the generation of parametrized output images from which post-processing.

Abstract: The disclosure relates to a method for obtaining a modified multi-view content from an original multi-view content, said method being characterized in that it comprises: determining (20), from a disparity-related map, a separation line separating adjacent first and second image regions, comprising at least one line portion each separating adjacent first and second image portions belonging respectively to the first image region and the second image region and such that a disparity-related value difference between the first and the second image portion is higher than a disparity-related value difference between the first and the second portion is higher than a disparity-related value difference threshold; obtaining (40) a modified multi-view content by blurring a visual discomfort area that is an area of the second image region, which extends from the separation line over a given distance.

Abstract: A method and an apparatus for adapting a number of views delivered by an auto-stereoscopic display device are presented. The method is executed by an electronic device, and it comprises: determining a number of views based on a list of number of views supported by the auto-stereoscopic display device and at least an information indicative of a computing power of a device needed to deliver content for each view; obtaining a correspondence map between sub-pixels of the auto-stereoscopic display device and the number of views; and providing content to the sub-pixels of the auto-stereoscopic display device according to the correspondence map.

Abstract: A device is intended to process three-dimensional content for a server. The three-dimensional content comprises at least two image sequences obtained from different angles, wherein a three-dimensional rendering is associated to a level of disparity between said at least two image sequences. This processing device is configured to generate from a content at least two different content versions corresponding to different levels of disparity adapted to different transmission bit rates, wherein the disparity level decreases with said transmission bit rate. A server comprising the processing device, a three-dimensional content-obtaining device, and a content receiver comprising three-dimensional content-obtaining device are further disclosed.

Abstract: The invention concerns a method and a device for correcting distortion errors in a 3D content viewed by an observer on a screen. The method comprises the step of determining a rendered roundness factor (rrf) of a pinhole model projected cylinder, estimating a rendered roundness factor table depending on the defined distance of the observer to the screen and the disparity values of objects of the image, determining for the observer a disparity transform function (TD) as a function of the estimated rendered roundness factor table and modifying the object disparity values using the disparity transform so that a perceived roundness factor of one is provided.

Abstract: A method, a device and a signal enabling automatic washouts in HAV contents. Washout related information is added to a signal representing a HAV content so that a HAV rendering device may adapt the washout to its physical limitations defined by the device capabilities as well as the user preferences. Different types of washouts are proposed. The HAV content signal comprises a first information representative of a haptic washout effect and an optional second information representative of the parameters required for the haptic washout effect. The method comprises performing a first haptic effect, computing the haptic washout effect according to device capabilities, user preferences, type of washout obtained from washout flags and optional washout parameters, and performing the haptic washout effect.

Abstract: In a particular implementation, a user environment space for haptic feedback and interactivity (HapSpace) is proposed. In one embodiment, the HapSpace is a virtual space attached to the user and is defined by the maximum distance that the user's body can reach. The HapSpace may move as the user moves. Haptic objects and haptic devices, and the associated haptic properties, may also be defined within the HapSpace. New descriptors, such as those enable precise locations and link between the user and haptic objects/devices are defined for describing the HapSpace.

Abstract: The present disclosure relates to methods and apparatus for encoding and decoding pixel lists of an image. The pixels of an image are clustered according to at least one relationship. Clusters are stored as pixel lists. An integer matrix of the same size as the image is generated. A pixel of the image at the first index belongs to one list. The next pixel in the list has a second index. An integer is calculated according to the two indices and is stored at the first index in the matrix. The matrix may be compressed according to a lossless compression method. At decoding, a pixel with a first index in the image is associated with a pixel list. A second index is calculated according to the integer at the first index in the matrix and the pixel at the second index in the image is added to the list.

Abstract: The invention consists in a method of and a device for adapting 3D content to an observer wearing prescription glasses. The method comprises the step of—providing information about prescription glasses of the observer;—calculating a value representative of the optical deviation created by the glasses from the provided information, for a given direction;—estimating a depth adjustment value as a function of the calculated value and—modifying the depth of the 3D content according to the estimated depth adjustment value.

Abstract: A method for obtaining a multi-view image to be displayed on an auto-stereoscopic display is provided. The auto-stereoscopic display is configured to display multi-view images with n views forming n?1 successive stereoscopic pairs of views. The method for obtaining a multi-view image to be displayed includes obtaining, within a current multi-view image displayed on the auto-stereoscopic display, a current stereoscopic pair of views associated with a location of an observer in front of the auto-stereoscopic display and obtaining the multi-view image to be displayed, from n views being determined responsive to the current stereoscopic pair of views, and defining a set of n?1 successive stereoscopic pairs of views in which the current stereoscopic pair of views occupies a substantially central position.

Abstract: The present disclosure relates to the transmission of sets of data and metadata and more particularly to the transmission of light-field contents. Light-field data take up large amounts of storage space which makes storage cumbersome and processing less efficient. In addition, light-field acquisition devices are extremely heterogeneous and each camera has its own proprietary file format. Since acquired light-field data from different cameras have a diversity of formats a complex processing is induced on the receiver side. To this end, it is proposed a method for encoding a signal representative of a light-field content in which the parameters representing the rays of light sensed by the different pixels of the sensor are mapped on the sensor. A second set of encoded parameters are used to reconstruct the light-field content from the parameters representing the rays of light sensed by the different pixels of the sensor.

Abstract: The invention relates to a reproduction device (21), with a device (20) acting as a source of digital services. It also relates to a method of synchronizing two parts of a digital service in a system including a source device according to the invention and at least one reproduction device according to the invention. According to the invention, the reproduction device (21) includes means for receiving the data forming at least a part of a digital service originating from a digital service source device (20), means for processing (210) at least some of the data received, means (211) for reproducing an output of at least a part of the digital service, the time for processing and reproducing the data introducing a delay in the output of the reproduced data. This device also includes communication means (213) for informing the source device of the delay introduced.

Abstract: The disclosure pertains a method for determining a rendered tridimensional content intended to a viewer. The method includes inputting a reference content comprising at least a reference view, inputting at least one information related to the viewer's eyes orientation relatively to a reference axis of a display device, and determining a rendered view as a function of the reference view, and the information related to the viewer's eyes orientation relatively to the reference axis of the display device.

Abstract: The present disclosure is directed to a method and a device for dealiasing borders in a 3D interpolated view, the interpolated view comprising at least foreground pixels with foreground video in formation and background pixels with background video information.

Abstract: The invention relates to a reproduction device (21), with a device (20) acting as a source of digital services. It also relates to a method of synchronizing two parts of a digital service in a system including a source device according to the invention and at least one reproduction device according to the invention. According to the invention, the reproduction device (21) includes means for receiving the data forming at least a part of a digital service originating from a digital service source device (20), means for processing (210) at least some of the data received, means (211) for reproducing an output of at least a part of the digital service, the time for processing and reproducing the data introducing a delay in the output of the reproduced data. This device also includes communication means (213) for informing the source device of the delay introduced.