Abstract: A device applies a pre-function to an input signal to obtain an intermediate signal, wherein the pre-function has a linear section part of the input range. The device then applies a LUT including LUT entries that define a linear section and that delimit the range of the intermediate signal that corresponds to the part of the input range, resulting in an output signal that can be linearly processed through the pre-function and the LUT. The device can process a signal with positive and negative values, where one of these lies in the part of the input range that results in linear processing.

Abstract: A method for estimating tone mapping parameters is disclosed. A first tone mapping parameter representative of a white level offset is obtained (S500) for a standard dynamic range current picture. Then, the obtained first tone mapping parameter is compared (S502) with a corresponding first tone mapping parameter obtained for a previous picture. Finally, second tone mapping parameters are updated (S504, S506) for the standard dynamic range current picture responsive to the comparing, wherein the second tone mapping parameters comprise pairs of values representative of a tone mapping output fine tuning function.

Abstract: A method comprising: converting input picture data in a first color space into first picture data in a second color space, the input picture data and the first picture data being in a first color gamut and corresponding to a first non-linear domain; converting the first picture data in a linear domain to obtain second picture data in the second color space; converting the second picture data into a second color gamut while remaining in the linear domain to obtain third picture data in the second color space; converting the third picture data to fourth picture data in the second color space corresponding to a second non-linear domain; and, converting the fourth picture data into output picture data in the first color space; applying a quantization to the output picture data to obtained quantized picture data; wherein the method further comprises: modifying a component of a sample of the quantized picture data in function of comparisons of components of a corresponding sample of the second picture data with val

Abstract: Methods, devices and video data for encoding, transmitting and decoding a video content item that is rendered and displayed with the same perceived color per any viewer, a content creator included, on any display. The colors wanted by the content creator are encoded in video data in association with master display information corresponding to the display used by the content creator and with master observer information corresponding to the vision characteristics of the content creator. Reciprocally, at decoder side, user display information and user observer information are collected. The rendered video on the user display is color adapted by using both the master information and the user information.

Abstract: A method comprising emulating (401) an implementation of a post-processing process of an SL-HDRx system before applying a pre-processing process of the SL-HDRx system using input color components of a current sample of a current picture up to a computation of at least one intermediate chroma component; determining (402, 404) that a value of the at least one intermediate chroma component is higher than a maximum chroma component value depending on a calculation precision set in the implementation of the post-processing process; applying (403, 405) a correction process on the input color components to obtain corrected color components for the current sample respecting at least a clipping prevention condition responsive to the value of the at least one intermediate chroma component is higher than the maximum chroma component value.

Abstract: 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 ƒw(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).

Abstract: Methods, devices and video data for encoding, transmitting and decoding a video content item that is rendered and displayed with the same perceived color per any viewer, a content creator included, on any display. The colors wanted by the content creator are encoded in video data in association with master display information corresponding to the display used by the content creator and with master observer information corresponding to the vision characteristics of the content creator. Reciprocally, at decoder side, user display information and user observer information are collected. The rendered video on the user display is color adapted by using both the master information and the user information.

Abstract: Systems, methods, and instrumentalities are disclosed for adapting media (e.g., video) processing operations and/or parameters based on one or more viewing conditions in a media environment (e.g., to achieve power saving). Such viewing conditions may include a distance between a display device and a viewer, a viewpoint or viewing direction of the viewer towards the display device, and/or an ambient light level in the media environment. Aspects of the medical processing that may be adapted based on the viewing conditions may be associated with deblocking, sample adaptive offset (SAO) filtering, adaptive loop filtering (ALF), cross component adaptive loop filtering (CCALF), motion compensation, post-inter prediction processing, bi-prediction, residual scaling, luma mapping, chroma residual scaling (LMCS), geometric block partitioning, HDR signal reconstruction, etc.

Abstract: According to an embodiment, a direction pointed by a controlling device with a first orientation may be obtained from a first image of a user handing the controlling device with the first orientation. For example, an initial indication of an initial pointed position may be displayed on a display device based on the direction. For example, angular information may be obtained. The angular information may be representative of a difference between the first orientation and a second orientation of the controlling device pointing to the pointed position. For example, an indication of a pointed position may be determined (e.g., for display) based on the initial pointed position and on the received angular information.

Abstract: A device applies a pre-function to an input signal to obtain an intermediate signal, wherein the pre-function has a linear section part of the input range. The device then applies a LUT including LUT entries that define a linear section and that delimit the range of the intermediate signal that corresponds to the part of the input range, resulting in an output signal that can be linearly processed through the pre-function and the LUT. The device can process a signal with positive and negative values, where one of these lies in the part of the input range that results in linear processing.

Abstract: 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 ƒw(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).

Abstract: 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.

Abstract: 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.

Abstract: A method for color processing in view of displaying a video image on a display device is described. The method includes retrieving a spectral power distribution associated with at least one group of light elements of the display device, the group of light elements displaying a color component of the video image to be displayed; computing, in a range of the spectral power distribution, called range of noxiousness, a noxiousness value representative of the noxiousness of the light emitted by the group of light elements of the display device; and comparing the noxiousness value to a bound value of noxiousness. If the noxiousness value is greater than the bound value, the content of the image is modified or the display control parameters of the display device are modified such that the noxiousness value becomes less than the bound value.

Abstract: 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.

Abstract: 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?) having the same hue (H?=H) and the same chroma (C?=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.

Abstract: 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.

Abstract: According to this method, the mapping color LUT has input colors that sample not only a source color gamut (included in an input encoding color space in which inputs colors of this LUT are encoded) but also a portion of the input encoding color space which is not included in the source color gamut. Preferably, this color LUT further includes output colors located outside the target color gamut. Accuracy of the mapping is improved, notably for source colors located near the boundary of the source color gamut.

Abstract: The invention relates to a reproduction device (21), with a device (20) 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 (21) includes means for receiving the data forming at least a part of a digital service originating from a digital service source device (20), means for processing (210) at least some of the data received, means (211) 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 (213) for informing the source device of the delay introduced.

Abstract: 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?) having the same hue (H?=H) and the same chroma (C?=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. An advantage of this method is to allow notably a colorist a broader range of chroma variations in a third step of mapping.