Thomson Licensing

Interdigital Vc Holdings, Inc.

Thomson Licensing S.a.

Interdigital Ce Patent Holdings

Interdigital Madison Patent Holdings, Sas

Thomson Licensing Dtv

Jonathan Kervec

Didier Doyen

Hassane Guermoud

Tania Pouli

Cedric Thebault

Emmanuel Jolly

Laurent Cauvin

Laurent Blondé

Thierry Borel

Laurent Blonde

Jurgen Stauder

Julien Thollot

Patrick Morvan

Angelo Mazzante

Carlos Correa

Sébastien Weitbruch

Bertrand Chupeau

Pascal Bourdon

Herbert Hoelzemann

Philippe Robert

Sylvain Thiebaud

Khaled Sarayeddine

Louis Chevallier

Jean-Ronan Vigouroux

Pascal Benoit

Jürgen Stauder

Luis Montalvo

Corinne Poree

Mekides Abebe

Chaker Larabi

Herert Hoelzemann

Hasan Sheik Faridul

Virginie Hallier

Nicolas Menard

Lyline Lim

Emmanuel Joly

Mekides Assefa Abebe

Tania Foteini Pouli

A lower dynamic range visual content () of a virtual reality or VR scene represented in a curved shape form is adapted to a higher dynamic range display of the virtual reality scene. At least two planar key views () of the VR scene area obtained at least two parameter values () respectively associated with those planar key views are obtained, corresponding to at least one parameter adapted to expand a dynamic range of a visual content, and a higher dynamic range visual content () corresponding to the lower dynamic range visual content in at least part of the VR scene extending beyond the planar key views is determined, based on the parameter values. Applications to Inverse Tone Mapping.

Device and method for dynamic range expansion in a virtual reality scene

The present principles relate to a method and device for gamut mapping from a first color gamut towards a second color gamut. The method comprises obtaining a preserved key color (prsv_color) and a hue alignment angle (&#x2296;) of the key color (color) for each key color (color) of at least 3 key colors to define a preserved gamut and a rotated gamut; and performing a hue mapping of a current color (color) from the first color gamut towards the second color gamut wherein in case the current color (color) is in a preserved gamut defined by the preserved key color (prsv_color), the hue mapped current color is unchanged, and in case the current color is out of the preserved gamut, the hue mapped current color is calculated from the hue alignment angle (&#x2296;) of two adjacent key colors of the current color (rotated gamut) and from the preserved area.

Method and device for color gamut mapping

Device comprising: By the modulation of chrominance which is added to the modulation of luminance for the backlighting elements of the rear panel, the device according to the invention makes it possible to display the images with even more contrast and better quality. A specific control mode makes it possible to avoid the colour 'interferences'.

Device for displaying images comprising two modulation stages

According to the invention, the saturation thresholds (th; th; th) used for this detection depend on color coordinates (r, g, b) representing an illuminant (ILL) of the image.

Method for detection of saturated pixels in an image

The present disclosure involves expanding the dynamic range of low dynamic range images and concerns obtaining a first expansion exponent map for an image, and determining, for each pixel of the image, an expanded luminance value by performing an exponentiation with an expansion exponent value determined from the first expansion exponent map on a luminance value of the pixel, and can include calculating, for the pixel of the image, an expansion correcting value by using a modulating function that takes as input a value representative of the luminance of the pixel and is an increasing function whose increase is higher for higher input values, and subtracting the expansion correcting value from the expansion exponent value of the first expansion exponent map.

Inverse tone mapping method and corresponding device

For the processing of an image with a tone-mapping function, it is known to select a tone-mapping function among a reference collection of reference tone-mapping functions and to apply the selected tone-mapping function to colors of this image. When applying this method to images of a video content, it is proposed to add, after such a selection for an image, a step of validation of this selection for the next images of video content. Advantage: prevent too frequent changes of tone-mapping function inside a video content, lower temporal instabilities and visual discomfort during visualization.

Tone-mapping of colors of a video content

A lower dynamic range visual content () of a virtual reality or VR scene represented in a curved shape form is adapted to a higher dynamic range display of the virtual reality scene. At least two views planar key views () of the VR scene area obtained, at least two parameter values () respectively associated with those planar key views are obtained, corresponding to at least one parameter adapted to expand a dynamic range of a visual content, and a higher dynamic range visual content () corresponding to the lower dynamic range visual content in at least part of the VR scene extending beyond the planar key views is determined, based on the parameter values. Applications to Inverse Tone Mapping.

The present principles relate to a method and device for gamut mapping from a first color gamut towards a second color gamut. The method comprises obtaining a preserved key color (prsv_color) and a hue alignment angle (&#x3b8;) of the key color (color) for each key color (color) of at least 3 key colors to define a preserved gamut and a rotated gamut; and performing a hue mapping of a current color (color) from the first color gamut towards the second color gamut wherein in case the current color (color) is in a preserved gamut defined by the preserved key color (prsv_color), the hue mapped current color is unchanged, and in case the current color is out of the preserved gamut, the hue mapped current color is calculated from the hue alignment angle (&#x3b8;) of two adjacent key colors of the current color (rotated gamut) and from the preserved area.

A method for inverse tone mapping is provided. The method comprising obtaining a digital image in a color space wherein the luminance is separate from the chrominance, determining a base luminance of pixels in the digital image, determining a detail enhancement map, determining a pixel expansion exponent map, determining an edge map of the image, inverse tone mapping luminance of image based on edge map, pixel expansion map and base luminance, and providing an expanded dynamic range image based on the inverse tone mapped luminance.

Method and apparatus for inverse tone mapping

The disclosure relates generally to the field of high dynamic range (HDR) imaging and addresses the way of expanding the dynamic range of low dynamic range images. A method having the steps of obtaining expansion exponent map data for each one of a plurality of clusters of reference images, obtaining, for each cluster, one feature, called visual feature, representative of the luminance of reference images of the cluster, obtaining a visual feature for the image, comparing the visual feature of the image with the visual features of the clusters according to a distance criterion, selecting the cluster, the visual feature of which is the closest to the visual feature of the image, and applying an expansion exponent map defined by the expansion exponent map data of the selected cluster to the image is described.

An image processing method is described. The method includes obtaining low dynamic range expansion exponents E(p), obtaining target expansion exponents E(p) as a weighted sum of the high dynamic range expansion exponents E(p) and of the low dynamic range expansion exponents E(p), applying obtained target expansion exponent E(p) to low dynamic range luminance values Yof a low dynamic range version of the image, resulting in target luminance values Y, and building a tone-adapted version of said image based on said target luminance values Y.

Method for tone adapting an image to a target peak luminance Lof a target display device

Inverse tone mapping based on luminance zones is provided. A digital image can be obtained and luminance values of pixels of the digital image can be determined. One or more values of luminance zone boundaries can be determined. A zone expansion exponent map based on the luminance values and the one or more luminance zone boundaries can be determined. The one or more luminance zone boundaries divide the zone expansion exponent map into a plurality of luminance zones. The luminance values of the image can be inverse tone mapped based on the zone expansion exponent map. An expanded dynamic range image can be provided based on the inverse tone mapped luminance values.

Inverse tone mapping based on luminance zones

Method of mapping source colors of an image into a target color gamut of a target color device in two mapping steps

A method for evaluating color differences of pixels is provided. The method comprises obtaining color information of a first pixel in a color opponent space obtaining color information of a second pixel in the color opponent space, defining a half-line in the color opponent space based on the color information of the first pixel, and determining distance between color information of the second pixel and half-line in the color opponent space.

Color distance determination

A method for converting a standard dynamic range (SDR) sequence into a high dynamic range (HDR) sequence is described. The method includes determining (S) successive shots in the SDR sequence by cut detection, detecting (S) if the SDR sequence comprises a sub-sequence of at least two successive short shots having a duration lower than D, said subsequence comprising at least one bright shot having a luminance and a size greater than Land SZrespectively, and mapping (S) the luminance range of bright shots of the detected subsequence from the low dynamic range to a first high dynamic range and mapping the other shots of the SDR sequence from the standard dynamic range to a second high dynamic range in order to generate the HDR sequence, the first high dynamic range having a maximal value Llower than that of the second high dynamic range L.

Method and device for inverse tone mapping

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Paimpont, France

Jonathan Kervec