Abstract: An encoder (400), a decoder (450), and methods (230, 30) for partitioning a picture from a sequence of video pictures into a layout having a plurality of flexible tiles or segments is disclosed. Each tile or segment (T) comprises a single rectangular or square region. The encoder generates (22) a partition structure and encodes (28) the tiles according to the partition structure. The encoder also generates a bitstream (12) comprising a plurality of coded picture segments and information indicating the partition structure used to partition the picture into the plurality of flexible tiles or segments, and sends (29) the bitstream to the decoder. Upon receipt, the decoder uses the coded picture segments and information in the bitstream to decode (38) the plurality of coded picture segments.

Abstract: Method for decoding a picture, comprising: decoding information that the picture is partitioned into more than one segment based on one or more syntax elements in a bitstream; decoding information that the spatial segmentation is uniform based on the one or more syntax elements; determining a segment unit size based on the one or more syntax elements or based on a predefined segment unit size; decoding a first value indicating a segment width from one or more code words in the bitstream; decoding a second value indicating a segment height from the one or more code words; deriving segment column widths based on a picture width in number of segment units and the first value; deriving segment row heights based on a picture height in number of segment units and the second value; deriving a spatial location for a current block based on the derived segment column widths and the derived segment heights; and decoding the current block based on the derived spatial location.

Abstract: There are provided mechanisms for processing encoded image data. The method comprises receiving an encoded bitstream comprising parameter set information. The parameter set information may comprise a syntax indicator, a first coded portion comprising first coded sample information for a picture and a second coded portion comprising second coded sample information for the picture. The method further comprises, responsive to a first value of the syntax indicator, decoding the first coded sample information using a picture header syntax element from a picture header of the encoded bitstream. The method further comprises, responsive to the first value of the syntax indicator, decoding the second coded sample information using the picture header syntax element from the picture header of the encoded bitstream.

Abstract: A method for decoding a picture from a bitstream, includes decoding a first part of the bitstream to form an address mapping that maps a segment group index value to a segment group address; and decoding a second part of the bitstream. The second part of the bitstream includes code words representing the plurality of segment groups. Decoding the second part of the bitstream includes decoding a first segment group. Decoding the first segment group includes: 1) decoding a first segment group index value for the first segment group; 2) determining a first segment group address for the first segment group; 3) determining a first spatial location for the first segment group; and 4) decoding at least one sample value for the first segment group and assigning the at least one sample value to a location in the decoded picture given by the first spatial location.

Abstract: In one embodiment of the disclosure, it is proposed diffraction grating structure comprising several grating lines. The diffraction grating structure is associated with a propagation layer, and the diffraction grating structure is made of a material that has a refractive index being equal to n2 (?). The diffraction grating structure is remarkable in that it comprises 1/T grating lines per ?m, with T=(n2 (?)+1)/?, where ? is a wavelength defined from an incident electromagnetic wave.

Abstract: The present disclosure relates to an image sensor (21) comprising an array of pixels, wherein a set of pixels of the array comprises pixels with different height levels arranged according to their height level and relative position to an optical axis (22) of the image sensor, wherein each pixel of the set can take one height level i among N different height levels, N?2, where i=1 is the smallest height level and i=N is the highest height level. According to the disclosure, for a pixel of the set having a first height level equal to n, 2?n?N, and an adjacent pixel of the set having a second height level equal to m, lower than the first height level, in at least one of horizontal, vertical, or diagonal scanning direction, from a point at which the optical axis (22) intersects the image sensor (21) to at least one rim of the image sensor, the second height level m is equal to n?1.

Abstract: An encoder and a decoder are provided for encoding, and decoding pictures, respectively. The encoder defines a structure for a picture segment by dividing the picture into multiple picture segment groups and assigning a unique group ID to each group. Each picture segment group is further divided into one or more picture segments or “tiles,” with each picture segment being assigned the ID of its picture segment group. The encoder then encodes the picture segments of the picture segment groups into a bit stream, and sends the bit stream to the decoder. Upon receiving the bit stream, the decoder extracts each picture segment group as a single entity and decodes the picture segments in each picture segment group in a predetermined order.

Abstract: In one embodiment of the disclosure, it is proposed a diffraction grating for diffracting light comprising a substrate and a plurality of grating unit cells positioned on the substrate surface. The grating unit cells form a periodic array of grating unit cells which are parallel to each other on said substrate surface or are along a same axis. The diffraction grating is associated with a three-dimensional Cartesian coordinates system defined by axis x, y and z, wherein the z-axis being normal to said diffraction grating.

Abstract: The disclosure relates to an image sensor comprising pixels for acquiring color information from incoming visible light, wherein said image sensor comprising at least two pixels being partially covered by a color splitter structure comprising a first part and a second part, each of said first and second parts being adjacent to a dielectric part, each of said dielectric part having a first refractive index n1 (said first part having a second refractive index n2, and said second part having a third refractive index n3, wherein n1<n3<n2, and wherein according to a cross section, the first part of said color splitter structure has a first width W1, a height H and the second part of said color splitter structure has a second width W2, and the same height H, and wherein said color splitter structure has a first, a second and a third edges at the interfaces between parts having different refractive indexes, each edge generating beams or nanojets, and wherein said height H is close to a value Formul (I), where

Abstract: The present disclosure concerns an image sensor comprising a set of pixels, wherein each pixel of the set comprises a first and a second element, the first element comprising a photodiode module unit, and the second element being an element for filtering color and focusing incident light into said first element. The image sensor further comprises at least two consecutive pixels from the set of pixels, for which first elements are put side by side, and wherein the image sensor comprises a gap between second elements of said at least two consecutive pixels.

Abstract: A plenoptic imaging device (2) comprising a micro-lens array (MLA) placed between a main lens (L) and an image sensor (IS) is provided. The plenoptic imaging device (2) further comprises a color filter element (CFE) arranged in an aperture stop plane of the main lens (L), said color filter element (CFE) comprising at least two different color filters.

Abstract: The present disclosure concerns an image sensor comprising at least one sensing unit, said at least one sensing unit comprising means for converting light into a readable electric signal. The image sensor is remarkable in that said at least one sensing unit comprises light guiding means for guiding light in direction to said means for converting light into a readable electric signal, said light guiding means comprising: at least one layer of a dielectric material, having a first refractive index with a surface having at least one abrupt change of level forming a step, and an element having a second refractive index lower than said first refractive index, which is in contact with said step.

Abstract: A device for shielding at least one sub-wavelength-scale object from an electromagnetic wave, which is incident on said device, comprises at least one layer of a dielectric material, a surface of which having at least one abrupt change of level forming a step. At least a lower and lateral part of the surface with respect to the step is in contact with a medium having a refractive index lower than that of the dielectric material. The at least one sub-wavelength-scale object is located within the device in a quiet zone where an electromagnetic field intensity is below a threshold, the quiet zone extending above said surface, in the vicinity of the step, in a direction of incidence of said electromagnetic wave.

Abstract: The disclosure relates to method for storing and transmitting sparse matrices in compact way. When storing and manipulating sparse matrices on a device, it is beneficial and often necessary to use specialized algorithms and data structures that take advantage of the sparse structure of the matrix. The trade-off is that accessing the individual elements becomes more complex and additional structures are needed to be able to recover the original matrix unambiguously. The method according to an embodiment includes storing indexes enabling the position in the matrix of non-null elements to be determined in an ordered way, so as to limit the amount of information to be encoded, and thus reduce the amount of data to be transmitted. The encoded information is sufficient for enabling the reconstruction of the matrix on a receiver.