Chromatic Calibration of an HDR display using 3D octree forests

Number: 9997134
Published: 2018-06-12
Filed: 2015-02-02
Assignee: DISNEY ENTERPRISES, INC.
Inventors: Smolic; Aljosa; Stefanoski; Nikolce; Aydin; Tunc Ozan; Liu; Jing; Grundhofer; Anselm
CPC: G09G5/026; G09G5/06
Verdict: Low Hardware
Source: Google Patents · FreePatentsOnline

The keeper's note

HDR display chromatic calibration.

Abstract

Methods and systems for calibrating devices reproducing high dimensional data, such as calibrating High Dynamic Range (HDR) displays that reproduce chromatic data. Methods include mapping input data into calibrated data using calibration information retrieved from spatial data structures that encode a calibration function. The calibration function may be represented by any multidimensional scattered data interpolation methods such as Thin-Plate Splines. To efficiently represent and access the calibration information in runtime, the calibration function is recursively sampled based on guidance dataset. In an embodiment, an HDR display may be adaptively calibrated using a dynamic color guidance dataset and dynamic spatial data structures.

Background

FIELD OF INVENTION(1) Embodiments of the present invention relate to methods and systems for calibrating devices reproducing high dimensional data, such as calibrating High Dynamic Range (HDR) displays that reproduce chromatic data.BACKGROUND OF INVENTION(2) Various devices are designed to translate high dimensional data from one medium to another with the goal of reproducing the same measurable information. For example, imaging devices, such as displays, are designed with the goal of producing chromatic radiances (i.e. color pixels) with spectral composition identical to those provided at their input. In practice, imaging devices introduce distortions; identical reproduction of color is not feasible. To remedy this, known calibration methods are employed where input color pixel values are altered so that when provided to the imaging device input, the device reproduces output color pixel values that are perceptually identical to the corresponding input color pixel values.(3) HDR displays or HDR projectors are examples of devices where chromatic calibration is required. HDR content, captured by HDR cameras, features contrast range and richness of color that closely resemble the human viewer perception of the real world. In contrast to the common Standard Dynamic Range (SDR) displays, HDR displays are capable of producing images with extremely bright regions alongside notably dark regions; a striking contrast that is enabled by recent innovations in local dimming technologies.

Claims

1. A computer-implemented calibration method for calibrating a High Dynamic Range (HDR) device having a HDR device input and a HDR device output, comprising: receiving input chromatic data, wherein the input chromatic data exists in a first color gamut; mapping the input chromatic data into calibrated chromatic data using calibration information retrieved from a database, wherein the database includes octree data structures that represent a spatial sampling of a calibration function and wherein the calibrated chromatic data exists in a second color gamut; providing the calibrated chromatic data to the HDR device input; and generating, at the HDR device output, a measurable output based on the calibrated chromatic data. 9. A calibration system for calibrating a High Dynamic Range (HDR) device having a HDR device input and a HDR device output, comprising: input chromatic data, wherein the input chromatic data exists in a first color gamut; a database containing octree data structures, wherein the octree data structures represent a spatial sampling of a calibration function; a calibration component configured to map the input chromatic data into calibrated chromatic data using calibration information retrieved from the database, wherein the calibrated chromatic data exist in a second color gamut; and the HDR device configured to receive the calibrated chromatic data, at the HDR device input, and generate, at the HDR device output, a measurable output based on the calibrated chromatic data. 17. A non-transitory computer-readable storage medium storing a set of instructions that is executable by a processor, the set of instructions, when executed by the processor, causing the processor to perform operations comprising: receiving input chromatic data, wherein the input chromatic data exists in a first color gamut; mapping the input chromatic data into calibrated chromatic data using calibration information retrieved from a database, wherein the database includes octree data structures that encode a calibration function and wherein the calibrated chromatic data exists in a second color gamut; providing the calibrated chromatic data to a HDR device input; and generating, at a HDR device output, a measurable output based on the calibrated chromatic data.