Abstract: A display management processor receives an input image with enhanced dynamic range to be displayed on a target display which has a different dynamic range than a reference display. The input image is first transformed into a perceptually-quantized (PQ) color space. A non-linear mapping function generates a tone-mapped intensity image in response to the characteristics of the source and target display and a measure of the intensity of the PQ image. After a detail-preservation step which may generate a filtered tone-mapped intensity image, an image-adaptive intensity and saturation adjustment step generates an intensity adjustment factor and a saturation adjustment factor as functions of the measure of intensity and saturation of the PQ image, which together with the filtered tone-mapped intensity image are used to generate the output image. Examples of the functions to compute the intensity and saturation adjustment factors are provided.

Abstract: In one embodiment, a dual modulator display systems and methods for rendering target image data upon the dual modulator display system are disclosed where the display system receives target image data, possible HDR image data and first calculates display control signals and then calculates backlight control signals from the display control signals. This order of calculating display signals and then backlight control signals later as a function of the display systems may tend to reduce clipping artifacts. In other embodiments, it is possible to split the input target HDR image data into a base layer and a detail layer, wherein the base layer is the low spatial resolution image data that may be utilized as for backlight illumination data. The detail layer is higher spatial resolution image data that may be utilized for display control data.

Abstract: Methods and systems for generating and applying scene-stable metadata for a video data stream are disclosed herein. A video data stream is divided or partitioned into scenes and a first set of metadata may be generated for a given scene of video data. The first set of metadata may be any known metadata as a desired function of video content (e.g., luminance). The first set of metadata may be generated on a frame-by-frame basis. In one example, scene-stable metadata may be generated that may be different from the first set of metadata for the scene. The scene-stable metadata may be generated by monitoring a desired feature with the scene and may be used to keep the desired feature within an acceptable range of values. This may help to avoid noticeable and possibly objectionably visual artifacts upon rendering the video data.

Abstract: Video data with both ultra-high definition (UHD) resolution and high or enhanced dynamic range (EDR) data are coded in a backward-compatible layered stream which allows legacy decoders to extract an HD standard dynamic range (SDR) signal. In response to a base layer HD SDR signal, a predicted signal is generated using separate luma and chroma prediction models. In the luma predictor, luma pixel values of the predicted signal are computed based only on luma pixel values of the base layer, while in the chroma predictor, chroma pixel values of the predicted signal are computed based on both the luma and the chroma pixel values of the base layer. A residual signal is computed based on the input UHD EDR signal and the predicted signal. The base layer and the residual signal are coded separately to form a coded bitstream. A compatible dual-layer decoder is also presented.

Abstract: Methods to reduce chroma-related artifacts during video coding of high dynamic range images are presented. Given an input signal in a color space comprising a luma component and two chromaticity components, a processor determines the original white point chromaticity coordinates (Du, Dv) of a white point in the color space of the input signal. The input signal is translated using a chromaticity translation function to a second signal in a translated color space comprising two translated chromaticity components, wherein the chromaticity translation function shifts the original white point chromaticity coordinates to a predetermined second set of coordinates in the translated chromaticity color space. The second signal is encoded to generate a coded bit stream.

Abstract: A display management unit configured to provide a modified video signal for display on a target display over an electronic distribution network. The unit may access information regarding the target display and at least one input. The unit comprises a database interface configured to retrieve display characteristics corresponding to the information regarding the target display from a characteristics database, and a mapping unit configured to map at least one of tone and color values from the at least one input to corresponding mapped values based at least in part on the retrieved display characteristics to produce the modified video signal.

Abstract: A method and system for merging graphics and high dynamic range video data is disclosed. In a video receiver, if needed, video and graphics are translated first into the IPT-PQ color space. A display management process uses metadata to map the input video data and the graphics from their own color volume space into a target blending color volume space by taking into consideration the color volume space of the target display.

Abstract: Image data is adjusted for display on a target display. Maximum safe expansions for one or more attributes of the image data are compared to maximum available expansions for the attributes. An amount of expansion is selected that does not exceed either of the maximum safe expansion and the maximum available expansion. Artifacts caused by over expansion may be reduced or avoided.

Abstract: Systems and methods are disclosed for dynamically adjusting the backlight of a display during video playback or for generating filtered video metadata. Given an input video stream and associated metadata values of minimum, average, or maximum luminance values of the video frames in the video stream, values of a function of the frame min, mid, or max luminance values are filtered using a temporal filter to generate a filtered output value for each frame. At least one filtering coefficient of the temporal filter is adapted based on a logistic function controlled by slope and sensitivity values. The instantaneous dynamic range of a target display is determined based on the filtered metadata values and the minimum and maximum brightness values of the display.

Abstract: Video data with enhanced dynamic range (EDR) are color graded for a first and a second reference display with different dynamic range characteristics to generate a first color-graded output, a second color graded output, and associated first and second sets of metadata. The first color-graded output and the two sets of metadata are transmitted from an encoder to a decoder to be displayed on a target display which may be different than the second reference display. At the receiver, a decoder interpolates between the first and second set of metadata to generate a third set of metadata which drives the display management process for displaying the received video data onto the target display. The second set of metadata of metadata may be represented as delta metadata values from the first set of metadata values.

Abstract: A handheld imaging device has a data receiver that is configured to receive reference encoded image data. The data includes reference code values, which are encoded by an external coding system. The reference code values represent reference gray levels, which are being selected using a reference grayscale display function that is based on perceptual non-linearity of human vision adapted at different light levels to spatial frequencies. The imaging device also has a data converter that is configured to access a code mapping between the reference code values and device-specific code values of the imaging device. The device-specific code values are configured to produce gray levels that are specific to the imaging device. Based on the code mapping, the data converter is configured to transcode the reference encoded image data into device-specific image data, which is encoded with the device-specific code values.

Abstract: A handheld imaging device has a data receiver that is configured to receive reference encoded image data. The data includes reference code values, which are encoded by an external coding system. The reference code values represent reference gray levels, which are being selected using a reference grayscale display function that is based on perceptual non-linearity of human vision adapted at different light levels to spatial frequencies. The imaging device also has a data converter that is configured to access a code mapping between the reference code values and device-specific code values of the imaging device. The device-specific code values are configured to produce gray levels that are specific to the imaging device. Based on the code mapping, the data converter is configured to transcode the reference encoded image data into device-specific image data, which is encoded with the device-specific code values.

Abstract: Method and apparatus are provided for determining and adjusting drive values for a display comprising light source modulation layer such as a backlight array of LED and a display modulation layer such as an LCD panel. Image regions for which any of the display modulation layer drive values are above a predetermined threshold maximum value or below a predetermined threshold minimum value are flagged. The light source modulation layer control values determined for a subsequent frame of image data may be adjusted based on the flagged image regions. The adjustments to the light source modulation layer control values may reduce artifacts in the displayed image and increase the efficiency of the display.

Abstract: Video data with both ultra-high definition (UHD) resolution and high or enhanced dynamic range (EDR) data are coded in a backward-compatible layered stream which allows legacy decoders to extract an HD standard dynamic range (SDR) signal. In response to a base layer HD SDR signal, a predicted signal is generated using separate luma and chroma prediction models. In the luma predictor, luma pixel values of the predicted signal are computed based only on luma pixel values of the base layer, while in the chroma predictor, chroma pixel values of the predicted signal are computed based on both the luma and the chroma pixel values of the base layer. A residual signal is computed based on the input UHD EDR signal and the predicted signal. The base layer and the residual signal are coded separately to form a coded bitstream. A compatible dual-layer decoder is also presented.

Abstract: A method for color grading input video data for display on a target display comprises obtaining target display metadata indicative of a capability of the target display, obtaining input video data metadata indicative of image characteristics of the input video data, automatically determining initial values for parameters of a parameterized sigmoidal transfer function, at least one of the initial values based at least in part on at least one of the target display metadata and the input video data metadata and mapping the input video data to color-graded video data according to the parameterized transfer function specified using the initial values.

Abstract: A handheld imaging device has a data receiver that is configured to receive reference encoded image data. The data includes reference code values, which are encoded by an external coding system. The reference code values represent reference gray levels, which are being selected using a reference grayscale display function that is based on perceptual non-linearity of human vision adapted at different light levels to spatial frequencies. The imaging device also has a data converter that is configured to access a code mapping between the reference code values and device-specific code values of the imaging device. The device-specific code values are configured to produce gray levels that are specific to the imaging device. Based on the code mapping, the data converter is configured to transcode the reference encoded image data into device-specific image data, which is encoded with the device-specific code values.

Abstract: An emulator yields modified image data that predicts the appearance of image content on a target display. The emulator generates modified image data based in part on the image content. The emulator may perform a transformation in which one or more parameters representative of features such as black level and/or white level of the target display are functions of image statistics for the image content.

Abstract: A display management unit configured to provide a modified video signal for display on a target display over an electronic distribution network. The unit may access information regarding the target display and at least one input. The unit comprises a database interface configured to retrieve display characteristics corresponding to the information regarding the target display from a characteristics database, and a mapping unit configured to map at least one of tone and color values from the at least one input to corresponding mapped values based at least in part on the retrieved display characteristics to produce the modified video signal.

Abstract: Image data is adjusted for display on a target display. Maximum safe expansions for one or more attributes of the image data are compared to maximum available expansions for the attributes. An amount of expansion is selected that does not exceed either of the maximum safe expansion and the maximum available expansion. Artifacts caused by over expansion may be reduced or avoided.

Abstract: Image data may be color graded, distributed and viewed on target displays. Mappings that preserve mid-range points and mid-range contrast may be applied to view the image data for color grading and to prepare the image data for display on a target display. The image data may be expanded to exploit the dynamic range of the target display without affecting mid-tone values.