基于LCOS数码冲印的颜色管理系统研究
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摘要
数码相机的普及极大地刺激了数码冲印市场的发展,但目前国内数码冲印技术仍远远落后于世界先进水平。LCOS微显示技术的引入,为我国数码冲印的发展提供了契机。通过技术分析和市场调查,发现颜色管理系统将是决定LCOS数码冲印成败的关键,同时也是我国数码冲印能否突破Kodak、Frontier等垄断的关键。为此,本论文结合系统的硬件特性,对以下方面进行了创新性研究:
色域匹配:在实现CRT和相纸色度预测的基础上,从匹配方向和匹配方式两个角度对传统的色域匹配算法进行了改进。匹配方向方面,提出了加权视觉色差公式,并设计了实用的三维搜索匹配模型。匹配方式方面,通过对图像内容的分析,在裁剪和线性压缩两种匹配方式间寻求最佳平衡点,构建虚拟色域并实现了非线性压缩匹配。
Gamma校正:根据冲印系统特性和LCOS的光电特性,运用数学反馈的方法建立了LCOS的Gamma校正流程。其主要环节包括密度校正、曝光量校正、均匀性校正、印前预校色等。在实际应用中,该流程有效地校正了LCOS反射光强的不一致性,并对均匀性和冲印环境所造成的色偏进行了补偿。
颜色空间转化:对曝光系统颜色空间转化的三维查表(3D LUT)和人工神经网络(ANN)方法进行了研究。目前颜色空间转化的3D LUT大多由IT8、ColorSync等软件生成,因此本论文从建表的角度对曝光系统色域进行了四面体划分。在ANN方法研究中,提出了自适应优化与进化规划的混合算法,有效地改善了大样本情况下网络的收敛性能。
软件系统:软件系统为实际冲印提供了操作平台,对图像的再现质量有着最直接的影响。其模块主要包括配置模块、硬件控制模块、图像浏览模块、图像处理模块等,除却算法以外,这一块是本论文工作最大所在,但限于篇幅,本论文只对关键点进行简要介绍。
The market of digital photofinishing is greatly stimulated by the popularization of digital camera. However, the domestic technology is far lower than the overseas. A good chance is provided for the domestic digital photofinishing with the application of LCOS technology. Based on the technology analysis and market investigation, color management system(CMS) will be the key to decide the future of LCOS digital photofinishing, and it is also the key to decide whether domestic digital photofinishing can break foreign monopolization. Considering the characteristic of hardware, the following innovations will be made in this dissertation.Gamut Mapping: Based on the colorimetric prediction of CRT's gamut and printing paper's gamut, the traditional gamut mapping algorithm(GMA) is improved from two aspects, mapping direction and mapping method. For mapping direction, the weighted formula of visual color difference is proposed and the three-dimensional mapping model is designed. For mapping method, the balance is made between the clipping method and compression method, which generates a virtual gamut region, and the non-linear compression is performed.Gamma Adjustment: Based on the characteristic of digital photofinishing and the photoelectric characteristic of LCOS, Gamma adjustment flow is designed with the mathematical feedback method. The main parts include density adjustment, exposure adjustment, pre-printing adjustment and uniformity correction. In the application, the difference of LCOS characteristic, the imaging uniformity and the color error caused by developing environment are adjusts effectively.Color Space Conversion: The color space conversion with three-dimensional lookup table(3D LUT) method and artificial neural network(ANN) method is studied. The tools like IT8, ColorSync and so on generate most of current
color-management-systems, so the tetrahedral dividing of gamut is discussed from building table. For ANN method, the combination algorithm of dynamic self-adapting and evolution programming is proposed, and the convergence of network is improved effectively.Software System: Software provides operation system for the digital photofinishing and it directly influences the reproduction quality. The main modules include configuration module, hardware controlling module, image browsing module, image processing module and so on. The software system is very complicated and only the key parts will be introduced briefly in the dissertation.The application of the discussed model is still at beginning stage. It can be predicted that the development of LCOS digital photofinishing industry even the whole digital photofinishing industry should be speeded up with its farther application.
色域匹配:在实现CRT和相纸色度预测的基础上,从匹配方向和匹配方式两个角度对传统的色域匹配算法进行了改进。匹配方向方面,提出了加权视觉色差公式,并设计了实用的三维搜索匹配模型。匹配方式方面,通过对图像内容的分析,在裁剪和线性压缩两种匹配方式间寻求最佳平衡点,构建虚拟色域并实现了非线性压缩匹配。
Gamma校正:根据冲印系统特性和LCOS的光电特性,运用数学反馈的方法建立了LCOS的Gamma校正流程。其主要环节包括密度校正、曝光量校正、均匀性校正、印前预校色等。在实际应用中,该流程有效地校正了LCOS反射光强的不一致性,并对均匀性和冲印环境所造成的色偏进行了补偿。
颜色空间转化:对曝光系统颜色空间转化的三维查表(3D LUT)和人工神经网络(ANN)方法进行了研究。目前颜色空间转化的3D LUT大多由IT8、ColorSync等软件生成,因此本论文从建表的角度对曝光系统色域进行了四面体划分。在ANN方法研究中,提出了自适应优化与进化规划的混合算法,有效地改善了大样本情况下网络的收敛性能。
软件系统:软件系统为实际冲印提供了操作平台,对图像的再现质量有着最直接的影响。其模块主要包括配置模块、硬件控制模块、图像浏览模块、图像处理模块等,除却算法以外,这一块是本论文工作最大所在,但限于篇幅,本论文只对关键点进行简要介绍。
The market of digital photofinishing is greatly stimulated by the popularization of digital camera. However, the domestic technology is far lower than the overseas. A good chance is provided for the domestic digital photofinishing with the application of LCOS technology. Based on the technology analysis and market investigation, color management system(CMS) will be the key to decide the future of LCOS digital photofinishing, and it is also the key to decide whether domestic digital photofinishing can break foreign monopolization. Considering the characteristic of hardware, the following innovations will be made in this dissertation.Gamut Mapping: Based on the colorimetric prediction of CRT's gamut and printing paper's gamut, the traditional gamut mapping algorithm(GMA) is improved from two aspects, mapping direction and mapping method. For mapping direction, the weighted formula of visual color difference is proposed and the three-dimensional mapping model is designed. For mapping method, the balance is made between the clipping method and compression method, which generates a virtual gamut region, and the non-linear compression is performed.Gamma Adjustment: Based on the characteristic of digital photofinishing and the photoelectric characteristic of LCOS, Gamma adjustment flow is designed with the mathematical feedback method. The main parts include density adjustment, exposure adjustment, pre-printing adjustment and uniformity correction. In the application, the difference of LCOS characteristic, the imaging uniformity and the color error caused by developing environment are adjusts effectively.Color Space Conversion: The color space conversion with three-dimensional lookup table(3D LUT) method and artificial neural network(ANN) method is studied. The tools like IT8, ColorSync and so on generate most of current
color-management-systems, so the tetrahedral dividing of gamut is discussed from building table. For ANN method, the combination algorithm of dynamic self-adapting and evolution programming is proposed, and the convergence of network is improved effectively.Software System: Software provides operation system for the digital photofinishing and it directly influences the reproduction quality. The main modules include configuration module, hardware controlling module, image browsing module, image processing module and so on. The software system is very complicated and only the key parts will be introduced briefly in the dissertation.The application of the discussed model is still at beginning stage. It can be predicted that the development of LCOS digital photofinishing industry even the whole digital photofinishing industry should be speeded up with its farther application.
引文
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