Interdigital Ce Patent Holdings

Interdigital Vc Holdings, Inc.

Wei Hu

Mozhdeh Seifi

Erik Reinhard

Sebastien Lasserre

Kangying Cai

This method comprises: &#x2014;accessing () a point cloud (PC) comprising a plurality of points defined by attributes, said attributes including a spatial position of a point in a 3D space and at least one feature of the point;&#x2014;segmenting () the point cloud into one or more clusters (C) of points on the basis of the attributes of the points; and for at least one cluster (C):&#x2014;constructing () a similarity graph having a plurality of vertices and at least one edge, the similarity graph representing a similarity among neighboring points of the cluster (C) in terms of the attributes, the plurality of vertices including vertices Pand Pcorresponding to points of the cluster (C);&#x2014;assigning one or more weights wto one or more edges connecting vertices Pand Pof the graph;&#x2014;computing () a transform using the one or more assigned weights, said transform being characterized by coefficients; and&#x2014;quantizing () and encoding () the transform coefficients.

Methods and devices for encoding and reconstructing a point cloud

A method of obtaining one or more HDR images representative of a scene is described. To reach that aim, the method includes obtaining several LDR images representative of the scene. The method further includes identifying one or more first pixels having a pixel value that is greater than a first determined value (i.e. corresponding to underexposed pixels) or having a pixel value that is less than a second determined value (i.e. corresponding to overexposed pixels). The method further includes determining one second pixel, in one or more other LDR images, that corresponds to the first pixel. In a block of pixels centered on the second pixel, weighting values are determined that are representative of similarity between the second pixel and the other pixels of the block. A HDR image is finally obtained by determining and assigning a new pixel value to the first pixel. The new value is calculated based on weighting values and pixel values associated with pixels of a block of pixels centered on the first pixel.

Method and device for obtaining a HDR image by graph signal processing

The present disclosure concerns a method for calibrating a plenoptic camera. The plenoptic camera includes a lenslet array placed between a main lens and a photosensor, the lenslet array having a plurality of lenslets. The method is remarkable in that it includes obtaining a white image W and a model that describes light scene occlusion induced by the main lens and each lenslet. For a given pixel of the photosensor, where the model is represented by a set of parameters, obtaining a first subset of parameters values from the set of parameters in the model and obtaining a second subset of parameters value from the set of parameters in the model by performing a maximum likelihood estimation method based on the model, the white image and the first subset of parameters values, and where a union of the first and the second subsets of parameters corresponds to the set of parameters.

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Rennes, France

Wei Hu