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Perceptually Optimal Reproduction of Color Images considering Device Limits

考虑设备限制的彩色图像的感知最佳再现

基本信息

批准号：
83740676
负责人：
Dr. Philipp Urban
金额：
--
依托单位：
Fraunhofer-Institut für Graphische Datenverarbeitung (IGD)
依托单位国家：
德国
项目类别：
Independent Junior Research Groups
财政年份：
2008
资助国家：
德国
起止时间：
2007-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/83740676?language=en
关键词：
Perceptually Optimal Reproduction Color Images

项目摘要

In the proposed project the perceptually optimal reproduction of multispectral, high dynamic range images shall be investigated considering output-device limits (printers, displays and projectors). Of special interest are the limited metameric and spectral gamut as well as the low dynamic range of these devices. Previous approaches focused only on one single device limit (gamut mapping, spectral gamut mapping and HDR tone mapping). To allow for various appearance phenomena of the human visual system, however, a unified approach is necessary. For this purpose existing image appearance models shall be modified in order to map the image into a perceptually uniform appearance correlate space. One basic goal of this project is the development of an image difference measure within this space based on human spatial and color vision. For a multispectral image a sequence of coupled variational problems subject to device limits can be constructed by means of this image difference measure. The solution is an operator, which transforms the image into the device limits with minimal perceptual disagreement to the original. New numerical methods shall be developed to solve these variational problems. Particular importance shall be attached to their numerical complexity, convergence speed and robustness in order to handle also high resolution multispectral images in reasonable time. A prototypical multispectral reproduction system shall be designed and realized to show the feasibility of this approach, its applicability in terms of computational performance and to validate its optimality by means of psychophysical comparison experiments with existing methods.

在拟议的项目中，应考虑输出设备（打印机、显示器和投影仪）的限制，研究多光谱、高动态范围图像的感知最佳再现。特别令人感兴趣的是这些设备的有限同色异谱和光谱范围以及低动态范围。以前的方法仅关注一个设备限制（色域映射、光谱色域映射和 HDR 色调映射）。然而，为了考虑人类视觉系统的各种外观现象，需要一种统一的方法。为此，应修改现有的图像外观模型，以便将图像映射到感知上均匀的外观相关空间。该项目的一个基本目标是开发一种基于人类空间和色觉的空间内图像差异测量方法。对于多光谱图像，可以通过该图像差异测量来构造受设备限制的一系列耦合变分问题。解决方案是一个运算符，它将图像转换为设备限制，与原始图像的感知差异最小。应开发新的数值方法来解决这些变分问题。应特别重视其数值复杂性、收敛速度和鲁棒性，以便在合理的时间内处理高分辨率多光谱图像。应设计和实现原型多光谱再现系统，以展示该方法的可行性、计算性能的适用性，并通过与现有方法的心理物理学比较实验来验证其最优性。