共查询到19条相似文献,搜索用时 859 毫秒
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针对在交通路口采集的闯红灯的彩色图像中的色饱和现象,讨论了图像中高光区域的定位、边缘色彩的确定以及色彩校正等问题。使用基于符号的GMM模型的EM算法进行最大似然估计,获得分类结果,使用区域深度快速标记算法标记深度,提出色彩校正模型,最后给出实验结果及讨论。 相似文献
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针对CIELAB空间色调非恒常影响色域匹配及色差计算准确度问题,研究了色调恒常校正方法,建立了一种新的校正空间tLAB,并用其替代CIELAB空间实施色彩管理.首先,以孟塞尔空间为标准,分析了CIELAB空间的色调非恒常性.然后,利用孟塞尔新标数据对CIELAB空间实施色调校正,构建了色调恒常的颜色空间tLAB;借助三维查找表(3D-LUT)描述CIELAB和tLAB之间的非线性关系,提出了不增加时空代价的色彩管理工程实现方案.最后,给出了利用tLAB空间进行色域匹配的结果,以及新的色差评价指标体系.实验表明,利用tLAB空间进行色域匹配的效果明显优于传统方法,且用其替代CIELAB空间实施色彩管理具有很好的实时性和普适性. 相似文献
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优派日前发布的全球首款26寸全高清广色域液晶显示器VX2640w,色域值比目前主流液晶显示器72%的色域值提升30%。VX2640w具有4000:1的超高动态对比度,400nits高亮度,画面表现更亮丽饱和,色彩更鲜明。其内建的sRGB色彩校正技术,可将显示色彩真实还原,充分解决专业用户最头痛的色彩问题, 相似文献
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监控摄像机拍摄的影像或多或少的都会存在一些色差,经过处理后,可以一定程度上还原其真实的颜色,从而为划定侦查方向提供依据,为诉讼提供证据。本文建议使用iSeetest软件检测监控摄像机的色还原能力,除提高摄像机的硬件设施外,通过灰度世界算法对拍摄出的影像进行色差校正,该技术根据色彩恒常性和色彩适应理论对每一个像素点进行补偿,使其显现正常的颜色。本文从拍摄ColorChecker标准色卡入手,成功检测出实验监控摄像机的色还原能力,然后对拍摄的图片进行处理,在灰度世界算法、灰度世界改进算法、暗通道优先算法中增加预处理环节,提升了色彩校正效果。 相似文献
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针对普通显示液晶系统在色彩表现方面的不足,在现有色域扩展技术的基础上,设计了一种以白和宝石蓝两种颜色发光二极管作为背光源的宽色域液晶显示系统。本文通过分析普通显示系统的色域,以色域覆盖率最大化为准则,选择主波长为501nm的宝石蓝发光二极管作为扩展背光源,扩展普通显示系统未能显示的青绿色区域。从理论上分析该系统的色域范围,并且详细介绍了系统背光源阵列、数据转发等功能模块的电路实现。实验结果表明:本文所设计的宽色域液晶显示系统的色域扩展了青绿色区域且色域覆盖率可达到45.65%。相比与其他多原色显示系统,本文设计的宽色域液晶显示系统不仅简化了硬件设计的复杂度,而且能够重现更多青绿色区域的颜色。 相似文献
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Ron Kimmel Doron Shaked Michael Elad Irwin Sobel 《IEEE transactions on image processing》2005,14(6):796-803
Gamut mapping deals with the need to adjust a color image to fit into the constrained color gamut of a given rendering medium. A typical use for this tool is the reproduction of a color image prior to its printing, such that it exploits best the given printer/medium color gamut, namely the colors the printer can produce on the given medium. Most of the classical gamut mapping methods involve a pixel-by-pixel mapping and ignore the spatial color configuration. Recently proposed spatial-dependent approaches for gamut mapping are either based on heuristic assumptions or involve a high computational cost. In this paper, we present a new variational approach for space-dependent gamut mapping. Our treatment starts with the presentation of a new measure for the problem, closely related to a recent measure proposed for Retinex. We also link our method to recent measures that attempt to couple spectral and spatial perceptual measures. It is shown that the gamut mapping problem leads to a quadratic programming formulation, guaranteed to have a unique solution if the gamut of the target device is convex. An efficient numerical solution is proposed with promising results. 相似文献
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Raja Bala Gaurav Sharma Vishal Monga Jean-Pierre Van de Capelle 《IEEE transactions on image processing》2005,14(8):1172-1186
Color device calibration is traditionally performed using one-dimensional (1-D) per-channel tone-response corrections (TRCs). While 1-D TRCs are attractive in view of their low implementation complexity and efficient real-time processing of color images, their use severely restricts the degree of control that can be exercised along various device axes. A typical example is that per separation (or per-channel), TRCs in a printer can be used to either ensure gray balance along the C = M = Y axis or to provide a linear response in delta-E units along each of the individual (C, M, and Y) axis, but not both. This paper proposes a novel two-dimensional color correction architecture that enables much greater control over the device color gamut with a modest increase in implementation cost. Results show significant improvement in calibration accuracy and stability when compared to traditional 1-D calibration. Superior cost quality tradeoffs (over 1-D methods) are also achieved for emulation of one color device on another. 相似文献
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为了更全面地评价显示器的色重显性能,用准积分法构建了人类视觉可感知三维色域.该算法用CIE标准色度观察者观察、混配等能单色辐射测得的CIE 1931 XYZ色度系统光谱三刺激值,按某一波长间隔求累加和,来近似实现未知函数表达式的多重积分运算.构建的色域囊括了人眼能识别的全部颜色,是宽色域、高动态范围显示设备的目标色域.还用三棱锥体积求和算法计算出该色域体积,验证了算法的可行性.进而由实测的LCD电视显示器数据,用同样方法计算其三维色域,并与视觉可感知三维色域进行定量比较.这些工作表明,本算法可为定量评价显示器的三维色域提供理论依据和可行算法,用这种方法给出的显示设备三维色域覆盖率可克服通常在二维色度图计算色域覆盖率的局限性. 相似文献