Abstract: Method and apparatus for estimating the depth of focused plenoptic data are suggested. The method includes: estimating the inherent shift of in-focus pixels of the focused plenoptic data; calculating a level of homogeneity of the pixels of the focused plenoptic data; determining the pixels of the focused plenoptic data which either have disparities equal to the inherent shift or belong to homogeneous areas, as a function of the level of homogeneity of the pixels of the focused plenoptic data; and estimating the depth of the focused plenoptic data by a disparity estimation without considering the determined pixels. According to the disclosure, the pixels of the focused plenoptic data which either have a disparity equal to the inherent shift or belong to a homogeneous area will not be considered for the estimation of the depth, which can reduce computational costs and at the same time increase accuracy of estimations for in-focus parts of the scene.

Abstract: Method and device adapted for the processing of lightfield data representative of a scene, said lightfield data comprising a plurality of elements, 4-dimensional coordinates being associated with each element. Following operations are performed: associating a ray with each element, the ray being obtained from the 4-dimensional coordinates associated with each element; determining a depth information for each element; determining an origin of each ray in the scene according to the depth information; grouping rays having a same origin in the scene to form a plurality of groups; processing the lightfield data according to the plurality of groups.

Abstract: A plenoptic camera comprising a camera lens, a lenslet array comprising a plurality of microlenses and a photosensor array. In order to determine reference pixels of sub-images, the camera lens comprises a light emitting device arranged in the aperture stop plane of the camera lens, the light emitting device lighting the photosensor array.

Abstract: A plenoptic camera has a moveable micro-lens array in optical registration with an image sensor. A first prime mover displaces the micro-lens array synchronized with a frame rate for the camera to obtain multi-resolution of a scene. A second prime mover displaces the image sensor to increase color sampling.

Abstract: A method of performing depth estimation, the method comprising: estimating, at a higher spatial resolution of images, a global disparity map based on disparity between corresponding pixels of a stereo disparity map obtained from images forming a stereo image set associated with a passive depth estimation technique and an active depth map associated with an active depth estimation technique, wherein the disparity is estimated within a restricted range determined based on a disparity previously estimated between a stereo disparity map and an active depth map corresponding to a lower spatial resolution of the said images and map.

Abstract: The present invention generally relates to COLOR transfer between two images. COLOR transfer is a known technic consisting in modifying the COLORs of a source image by applying the COLOR palette of an example image without changing the source image structure. A lot of COLOR transfer method are known which consist in transferring COLORs between two images, however, those methods do not preserve the quality of the bokeh in areas of an images that are not in focus at a given depth. This results in a navigation in the depth dimension that is not smooth. It is proposed to modify the COLORs of a focal stack of a scene according to a COLOR palette by propagating the COLORs of the pixels in focus in different layers of the reCOLORed focal stack to the layers of the reCOLORed focal stack located behind the layer wherein a considered pixel is in focus.

Abstract: The present invention generally relates to an apparatus and a method for computing an estimate position of a micro-image produced by a micro-lens of an array of micro-lenses of an optical acquisition system in order to calibrate said optical acquisition system. Existing solutions for estimating the position of the micro-image are not designed to be fast and are resource consuming. It is proposed to estimate the position of the micro-image by extracting the parameters D,?,x0,0,y0,0 defining this position from an image in the Fourier domain. The four parameters D,?,x0,0,y0,0 characterizing the position of the micro-image relatively to a pixel grid of a sensor of a plenoptic camera are estimated by knowing the accurate position of peaks of a Dirac comb in the image in the Fourier domain.

Abstract: A method and an apparatus for data retrieval in a lightfield database are described. An acquiring unit of the apparatus acquires a sample data. An operation unit determines a plurality of two-dimensional (2D) images from each 4D lightfield data of the lightfield database, and match the sample data with the determined 2D images according to geometrical parameters of the sample data and geometrical parameters of the 2D images. One of the 2D images is selected as a target image based on the matching result, and the 4D lightfield from which the target image is determined is retrieved.

Abstract: A method for obtaining a refocused image from 4D raw light field data for a given focus plane value g is described. The method is executed by an electronic device and is remarkable in that it comprises determining at least one pixel value, for at least one color component, of the refocused image at coordinates (k, l)?N2. The at least one projected pixel value with coordinates comprised in a neighborhood of said coordinates (k, l), for the at least one color component is determined, weighted and updated.

Abstract: A method and an apparatus for displaying light field video data are described. A receiving unit of the apparatus receives light field video data including a plurality of light field video sequences. Each light field video frames of of the light field video sequences has multiple selectable viewpoints. A light field video frame is provided by an operation unit and displayed on a display device with a first viewpoint. An input unit receives an input indicating a viewpoint different from the first viewpoint. The displayed light field video frame is then displayed with the indicated viewpoint. In one embodiment, two light field video frames of two light field video sequences are displayed respectively in main and side windows on the display device.

Abstract: A plenoptic camera comprising a camera lens, a lenslet array comprising a plurality of microlenses and a photosensor array. In order to determine reference pixels of sub-images, the camera lens comprises a light emitting device arranged in the aperture stop plane of the camera lens, the light emitting device lighting the photosensor array.

Abstract: Method and apparatus for estimating the depth of focused plenoptic data are suggested. The method includes: estimating the inherent shift of in-focus pixels of the focused plenoptic data; calculating a level of homogeneity of the pixels of the focused plenoptic data; determining the pixels of the focused plenoptic data which either have disparities equal to the inherent shift or belong to homogeneous areas, as a function of the level of homogeneity of the pixels of the focused plenoptic data; and estimating the depth of the focused plenoptic data by a disparity estimation without considering the determined pixels. According to the disclosure, the pixels of the focused plenoptic data which either have a disparity equal to the inherent shift or belong to a homogeneous area will not be considered for the estimation of the depth, which can reduce computational costs and at the same time increase accuracy of estimations for in-focus parts of the scene.

Abstract: A method and apparatus for controlling example-based image manipulation are disclosed where selection of example imagery and workpiece imagery is done with a pointing device and an act of motion thereof. For increasing the efficiency of controlling, selection of an image characteristic to be transferred is derived from an interaction sensed on a second input device during a time interval of the act of motion of the pointing device.

Abstract: The invention relates to a method for sorting a group of images of a database, the images of said group being called example images and being associated to a same scene. According to the invention, said method comprising determining and assigning a score to each example image and sorting the group of images according to the assigned scores, the method wherein determining a score to each example image comprises: obtaining an information representing at least a color distribution of at least one part of the source image; and for each example image: obtaining a value representing a spatial correspondence between the example image and the source image representing at least a part of the scene; and determining a score for the example image from said value and said information.

Abstract: The invention is related to a method of determining a disparity information associated with at least a block of pixel of a first view of a scene, a matrix of views comprising the first view and a plurality of second views of the scene. The first and second views are obtained by demultiplexing a raw image of the scene acquired with a plenoptic camera but are not demosaiced. The method comprises comparing a first color pattern associated with the first block of the first view with at least one second color pattern associated with at least one second block of at least one of the second views belonging to the row or the column comprising the first view in the matrix; selecting at least one second block if the associated second color pattern corresponds at least partially to the first color pattern; and determining the disparity information associated with the first block by using the selected at least one second block and the first block.

Abstract: A method of performing depth estimation, the method comprising: estimating, at a higher spatial resolution of images, a global disparity map based on disparity between corresponding pixels of a stereo disparity map obtained from images forming a stereo image set associated with a passive depth estimation technique and an active depth map associated with an active depth estimation technique, wherein the disparity is estimated within a restricted range determined based on a disparity previously estimated between a stereo disparity map and an active depth map corresponding to a lower spatial resolution of the said images and map.