Abstract: The disclosure relates to a method for encoding a sequence of frames with a first dynamic range. The method includes obtaining, for at least one frame with a first dynamic range of said sequence, at least one frame with a second dynamic range and at least one illumination map, the first dynamic range being higher than said second dynamic range, embedding the at least one illumination map within the at least one frame with a second dynamic range. This is done by obtaining, for at least one block of the at least one frame with a second dynamic range, selection parameters for selecting at least one bit of at least one information element obtained from the at least one block, and modifying at least one selected least significant bit, to carry data representing at least a part of the at least one illumination map.

Abstract: A method for color mapping a video signal into a mapped video signal responsive to at least one color mapping function is disclosed. To this aim, at least one black point offset is determined responsive to a color encoding system of the video signal and to a color encoding system of the mapped video signal. The at least one black point offset and the at least one color mapping function are then applied on the video signal to obtain the mapped video signal.

Abstract: Color mapping information can be used to transform one color to another color. The present embodiments provide a solution for representing the color mapping information using a successive application of multiple color mapping functions. Parameters for the multiple color mapping functions can be encoded into a bitstream. In one embodiment, color mapping functions are consecutively applied on their own domains of definition only. In another embodiment, the first color mapping (CRI1) is applied on its domain of definition only, but the second color mapping is applied only on samples that have been previously color mapped by CRI1 and which are also inside the domain of definition of the second color mapping function. At the decode side, the multiple color mapping functions can be reconstructed and successively applied to a decoded picture to generate another 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: To preserve backward compatibility with a non-HDR device or service, an HDR picture may be represented using a modulation value and an SDR picture representative of the HDR picture. The modulation value and the SDR picture can then be encoded into the bitstream. At the receiving side, the modulation value and the SDR picture can be decoded. Based on the modulation value, the SDR picture can be mapped to a decoded HDR picture. For a non-HDR device or service, the modulation value information may be discarded and only the SDR picture is decoded. In particular, the modulation value may be implicitly signaled, using quad-tree representation information, intra coding information, inter partition mode information or motion vector residual information.

Abstract: The present disclosure generally relates to a method and device of converting a high-dynamic-range (HDR) version of a picture to a standard-dynamic-range (SDR) version of this picture. The method is characterized in that it converts the high-dynamic-range version to the standard-dynamic-range version of the picture according to: a first indicator (I1) that indicates the presence of color mapping parameters; a second indicator (I2) that indicates whether a device is configured to convert the high-dynamic-range version to the standard-dynamic-range version of the picture by taking into account said color mapping parameters; and a third indicator (I3) that indicates whether converting without taking into account said color mapping parameters is inhibited.

Abstract: The present disclosure relates to a method and device for processing a picture comprising estimating a color mapping between a first color-graded version of picture whose values are represented in a first color volume and a second color-graded version of said picture whose values are represented in a second color volume.

Abstract: The present disclosure relates to methods, apparatus or systems for generating, transmitting and decoding a backward compatible immersive video stream. The stream is carrying data representative of an immersive video, composed of a frame organized according to a layout having a first area encoded according to a rectangle mapping, a second area encoded according to a mapping transitory from the rectangular mapping to an immersive mapping and a third area encoded according to the immersive mapping. In order to be backward compatible, the stream further includes first information representative of the size and the location of the first area within the video frame, and second information having at least the type of the selected layout, the field of view of first part, of the size of the second area within the video frame and a reference direction.

Abstract: The present disclosure relates to a method and device for processing a sequence of pictures comprising estimating a color mapping between a first color-graded version of said sequence of pictures whose values are represented in a first color volume and a second color-graded version of said sequence of pictures whose values are represented in a second color volume.

Abstract: A method of color mapping a video signal represented in a first color volume from color mapping data to be applied on a video signal represented in a second color volume is disclosed. The method comprises:—color mapping (14) said video signal represented in a first color volume from said first color volume into said second color volume in the case where said first and second color volumes are different; and—color mapping (16) said color mapped video signal based on said color mapping data.

Abstract: A method and device for processing a picture comprises estimating a color mapping between a first and a second color-graded version of the picture by estimating a color mapping function that maps the color values of the first color-graded version of the picture onto the color values of the second color-graded version of the picture.

Abstract: A method for encoding an interlaced video comprising a sequence of alternating TOP and BOT fields is disclosed. The method for encoding comprises: producing a sequence of frames, each frame being determined from at least two consecutive fields, each field forming a rectangular region of the frame, encoding each frame of the sequence to produce an encoded video of the sequence of frames.

Abstract: The present disclosure generally relates to a method and device for decoding an HDR picture from a bitstream representing a LDR picture and an illumination picture. The method comprising: obtaining a decoded version of the HDR picture by multiplying the sample values of a decoded version of the LDR picture by the sample values of the decoded version of the illumination picture; and obtaining a color value expressed in an output color space for each sample value of the decoded version of the HDR picture, the method is characterized in that it further comprises: obtaining a color value expressed in the output color space for each sample value of a decoded version of the LDR picture just before multiplying said color values by the sample values of the decoded version of the illumination picture.

Abstract: A method and a device are described for modifying a video frame for encoding or decoding wherein values of pixels of the video frame are represented an increased bit depth. The described method comprises using processing means for executing the step of offsetting the pixel values of increased bit depth with offsets, the offsets depending on a spatial neighbourhood of the pixel to-be-offset. Such local adaptive offsetting of pixel values de-emphasizes high frequencies in the transform domain artificially emphasized by the bit depth increase.

Abstract: The present disclosure generally relates to a bitstream relative to a video signal characterized in that it carries an information data which identifies an electro-optical-transfer-function intended to be applied on the video signal before rendering the video signal on a video display. The disclosure further relates to a method for generating such a bitstream and a method for obtaining an electro-optical-transfer-function intended to be applied on a video signal before rendering the video signal on a video display.

Abstract: The present disclosure generally relates to a method and device for encoding a frame. The method includes the steps of determining a backlight frame from the frame, calculating a residual frame responsive to the frame and the backlight frame, and predictive-encoding of the residual frame using a predictor of the residual frame calculated from an imposed frame (IMF), where the imposed frame is a low-dynamic version of the frame to be encoded. The disclosure relates also a method and device for decoding at least one bitstream representing a frame.

Abstract: The present invention relates to a method for encoding a color transform. The method includes encoding first parameters representative of video signal characteristics of color output decoded pictures remapped by said at least one color transform; and encoding second parameters representative of said the at least on color transform.

Abstract: The present disclosure relates to a method and device for processing a picture comprising estimating a color mapping between a first and a second color-graded version of said picture by estimating a color mapping function that maps the color values of said first color-graded version of said picture onto the color values of the second color-graded version of said picture, said color mapping function comprising at least two color transforms, the color values of the first color-graded version of the picture being represented in a first color volume and the color values of the second color-graded version of said picture being represented in a second color volume.

Abstract: A Video encoding method is disclosed that comprises: —receiving a video comprising a sequence of images comprising base layer images and enhancement layer images; —temporally filtering each base layer image into a temporally filtered image; —encoding the base layer images in order to produce base layer encoded video data and reconstructed base layer image; —encoding the enhancement layer images in order to produce enhancement layer encoded video data; —determining at least one parameter of a parametric filter for each reconstructed base layer image, such that applying the parametric filter with the parameter(s) to a version of the reconstructed base layer image produces a corrected base layer image which is closer to the temporally filtered image than the version of the reconstructed base layer image; —providing the base layer encoded video, the enhancement layer encoded video and the parameters.

Abstract: A method for encoding a LUT defined as a lattice of vertices is disclosed. At least one value is of each vertex of the lattice. The method comprises for a current vertex: predicting the at least one value of said current vertex from another value which is for example obtained from reconstructed values of neighboring vertices; and encoding in a bitstream at least one residue computed between the at least one value of the current vertex and its prediction in a bitstream.