Interdigital Vc Holdings, Inc.

Thomson Licensing

Interdigital Ce Patent Holdings, Sas

Angelo Mazzante

Cedric Thebault

Jurgen Stauder

Marie-Jean Colaitis

Jonathan Kervec

Patrick Morvan

Jürgen Stauder

Henk Heijnen

Gilles Gallou

Philippe Mace

Luc Roux

A device applies a pre-function w=P(x) to an input signal x to obtain a first result w and applies a LUT to the first result w, wherein the LUT represents a main function ƒ(w) defined for a second grid of values Gw such that the pre-function P(x) is piecewise defined on a first grid Gx of signal values, where Gw=P(Gx). The device can further obtain the pre-function P(x), piecewise defined on the first grid Gx of the signal x and calculate the LUT with the second grid Gw=P(Gx). The piecewise pre-function P(x) can be obtained from a second pre-function Q(x) by applying Q(x) to signal values x to calculate the second grid Gw=Q(Gx) and defining the pre-function P(x) piecewise on the first grid Gx by linear interpolation of the values of the second grid Gw such that P(Gx)=Q(Gx).

Device and method for applying a look-up table

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

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, in a plane of constant hue, obtaining a target lightness for a color on the boundary of first gamut with maximum chroma, called first cusp color; and lightness mapping of the color from the first color gamut towards the second color gamut wherein the lightness mapped color is calculated from a parabolic function applied to the color, the parabolic function mapping the first cusp color to a color having the target lightness. According to a particular characteristic, a preserved chroma is also obtained; and in case the chroma of the color is lower than or equal to the preserved chroma, the lightness mapped color is the color, and in case the chroma of the color is higher than the preserved chroma, the lightness mapped color is calculated from the parabolic function applied to the color.

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.

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, in a plane of constant hue, mapping the chroma of the color from the first color gamut towards the second color gamut at constant lightness. The chroma mapping further comprises obtaining a target color on the second color gamut boundary wherein the lightness of the target color is greater than or equal to the lightness of a color of maximum chroma of the first color gamut and wherein the lightness of the target color is lower than the lightness of a color of maximum chroma of the second color gamut. In case where the lightness of the color is greater than the lightness of the target color, the chroma mapping comprises mapping at constant lightness the chroma of a color on the first color gamut boundary by a decreasing function of chroma applied to lightness, wherein the respective outputs of the decreasing function applied to the lightness of the target color and to the lightness of the white are the chroma of the target color and the chroma of the white.

Source colors are mapped within a mapping segment starting at a preserved gamut boundary color (P) and ending at a target gamut boundary color (I) of the chromaticity plane, corresponding, in a linear 3D color space, to an intersection of the target color gamut (TCG) with a plane of constant luminance and with a mapping plane (MKO) comprising said source color (M), a black point (K) and a white point (O).

Method of mapping source colors of an image in a chromaticity plane

The present invention concerns a data requesting device enabling flexible obtaining of data, notably AV (Audio/Video) data, with possibly limited required resources in terms of processing, memory and storing, included from a remote server through a WAN. The requesting device of the invention may notably allow to pause and retrieve a movie being played from such a server.

Data requesting and transmitting devices and processes

After a first start-up, a first appliance performs a self-learning step for generating usage parameters. These parameters are elaborated on subsequent start-ups. When these parameters are optimized, the first appliance transmits them to another appliance which requests them. This second appliance uses the parameters of the first as optimized parameters. In this way, the second appliance limits the duration of the self-learning step and the use of non-optimal parameters. According to a refinement, the optimal parameters are centralized on a server which transmits them to a plurality of second appliances using a transmission network. The present invention also relates to an appliance and a server implementing the method.

Method of downloading usage parameters into an apparatus, and apparatus for implementing the invention

It relates notably to a data requesting device from a data server, comprising means for sending requests of determined data to the server, means for receiving streamed data from that server and for providing said data to processing means, and means for producing pause control signals, intended for pausing data streaming, and for triggering their sending to the server. The requesting device comprises means for generating normal state signals, intended to the server for testifying normal operation at the requesting device, and for triggering periodic transmission of those signals to the server.

Growing community of inventors

Cesson-Sevigne, France

Angelo Mazzante