Thomson Licensing

Interdigital Vc Holdings, Inc.

Interdigital Ce Patent Holdings

Interdigital Ce Patent Holdings, Sas

Interdigital Madison Patent Holdings, Sas

Patrick Morvan

Jurgen Stauder

Didier Doyen

Laurent Blonde

Rainer Zwing

Franck Abelard

Philippe Leyendecker

Sébastien Desert

Corinne Poree

Jonathan Kervec

Julien Thollot

Pascal Bourdon

Edouard Francois

Philippe Bordes

Pierre Andrivon

Sylvain Thiebaud

Jean-Ronan Vigouroux

Christophe Chevance

Erik Reinhard

Bongsun Lee

Jürgen Stauder

Marie-Jean Colaitis

Jean-Jacques Sacre

Laurent Blondé

Angelo Mazzante

Frederic Lefebvre

Frédéric Lefebvre

Joaquin Zepeda Salvatierra

Philippe Rio

Abhijit Sarkar

Maurice Fritsch

Marine Le Breton

Laurent BlondÉ

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

A method for generating a fourth color transform is disclosed, wherein said fourth color transform transforms an original picture into a target color graded version of said original picture. The method comprises obtaining a first color transform wherein said first (reference) color transform transforms said original picture into a first color graded version of said original picture; obtaining a second (reference) color transform wherein said second color transform transforms said original picture to a second color graded version of said original picture; obtaining a third (exemplary) color transform wherein said third color transform transforms said original picture to said target color graded version of said original picture; obtaining at least one interpolating parameter wherein the fourth color transform is close to or representative of the third color transform (exemplary) and the fourth color transform is obtained by applying a parametric function determined by the at least one interpolating parameter to the first color transform and second color transform. In a variant, the at least one interpolating parameter is obtained by minimizing an error between the third color transform and the fourth color transform.

Color grading interpolation methods and devices

The present principles are directed to a parameterized OETF/EOTF for processing images and video. The present principles provide a method for encoding a picture, comprising: applying a parameterized transfer function to a luminance (L) signal of the picture to determine a resulting V(L) transformed signal; encoding the resulting V(L); wherein the parameterized transfer function is adjusted based on a plurality of parameters to model one of a plurality of transfer functions. The present principles also provide for a method for decoding a digital picture, the method comprising: receiving the digital picture; applying a parameterized transfer function to the digital picture to determine a luminance (L) signal of the digital picture, the parameterized transfer function being based on a plurality of parameters; wherein the parameterized transfer function is adjusted based on a plurality of parameters to model one of a plurality of transfer functions.

Methods, systems and apparatus for electro-optical and opto-electrical conversion of images and video

Said method comprises a first cusp-oriented lightness-mapping step and a second lightness-mapping step in which a source color (N) is mapped into a mapped color (N&#x2033;) having the same hue (H&#x2033;=H) and the same chroma (C&#x2033;=C) as the source color, where the second mapping step is defined such as to bring more colors in a target color gamut and more colors closer to the boundary of this target gamut.

Lightness mapping in two steps

The invention relates to a reproduction device (), with a device () acting as a source of digital services. It also relates to a method of synchronizing two parts of a digital service in a system including a source device according to the invention and at least one reproduction device according to the invention. According to the invention, the reproduction device () includes means for receiving the data forming at least a part of a digital service originating from a digital service source device (), means for processing () at least some of the data received, means () for reproducing an output of at least a part of the digital service, the time for processing and reproducing the data introducing a delay in the output of the reproduced data. This device also includes communication means () for informing the source device of the delay introduced.

Device and method for synchronizing different parts of a digital service

The method comprises the generation of a deteriorated image associated with a first bit rate and of a deteriorated color transform associated with a second bit rate, an evaluation of a first distortion by comparison of the image with a first test image obtained by the application of the color transform to the deteriorated image, and of a second distortion by comparison of the image with a second test image obtained by the application of the deteriorated color transform to the image, and the determination of a final conjoint bit rate associated with a best trade-off between a conjoint bit rate (R=R1+R2) and a global distortion (dE=dE1+DE2). The optimized deteriorated image and the optimized deteriorated color transform are then embedded based on this conjoint bit rate.

Method of embedding of an image with a color transform

In one implementation, the method includes applying color gamut mapping directly to incoming RGB color coordinates resulting in mapped source coordinates R&#x2033;G&#x2033;B&#x2033;. The source coordinates are then transformed into target coordinates R'G&#x2032;B&#x2032;. According to another implementation, incoming source coordinates RGB are transformed into target coordinates R&#x2033;G&#x2033;B&#x2033; and the color gamut mapping is applied directly to the target coordinates R&#x2033;G&#x2033;B&#x2033; resulting in mapped target coordinates R&#x2032;G&#x2032;B&#x2032;.

Method of mapping source colors from a source color gamut into a target color gamut

Color calibration of an image capture device in a way that is adaptive to the scene to be captured

According to this method, successive iterations are launched according to the following steps:&#x2014;1) the reproduction color device is set according to settings,&#x2014;2) reference input colors are calibrated putting calibrated input colors,&#x2014;4) reproduction quality rating value are calculated,&#x2014;5) a reproduction quality criterion is applied to decide or not to go for another iteration with different settings. This method allows the optimization of the settings according to color preferences.

Method for adjusting the settings of a reproduction color device

In order to preserve the discontinuities of an actual gamut surface and/or the discontinuities of its curvature, notably through a smoothing operation, in this method, when at least a vertex of any elementary polygon, the network of which represents an actual gamut boundary, belongs either to a line or a point of discontinuity of this actual gamut boundary, either to a line or a point of discontinuity of curvature of said actual gamut boundary, or both, metadata related to this belongings are added to the definition of the elementary polygons.

Method of creating a gamut boundary descriptor preserving the discontinuities of an actual gamut surface

To describe the actual color gamut, a hierarchical structure is proposed which comprises, from bottom to top: Such a Gamut Boundary Information may be notably used for gamut mapping operations. Among advantages of the invention, are flexibility and adaptation to available memory and bandwidth capabilities.

Method for describing an actual color gamut of a color device or of a color content

The present invention relates to a method of displaying a color video image in a sequential color display panel. The video frame is divided into a plurality of consecutive time segments each assigned to a given color component, and the video level of the pixels of the image is displayed by modulating the display time of the corresponding cells. The invention aims to propose a display method that reduces the blurring effect without causing color break-up. According to the invention, at least one reference time segment is defined in said plurality of time segments, and the image is displayed giving priority to lighting the cells during the reference time segment and the time segments closest to the reference time segment.

Video image display method and display panel using it

The invention relates to a reproduction device, with a device acting as a source of digital services. It also relates to a method of synchronizing two parts of a digital service in a system including a source device according to the invention and at least one reproduction device according to the invention. According to the invention, the reproduction device includes means for receiving the data forming at least a part of a digital service originating from a digital service source device, means for processing at least some of the data received, means for reproducing an output of at least a part of the digital service, the time for processing and reproducing the data introducing a delay in the output of the reproduced data. This device also includes communication means for informing the source device of the delay introduced.

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Laille, France

Patrick Morvan