共查询到19条相似文献,搜索用时 484 毫秒
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针对显示器图像颜色复现问题,提出了一种基于图像质量评价和图像分割-融合策略的色域映射算法。详细分析了各类色域映射算法的特点并选取4种算法作为基本色域映射算法。提出了一种色域映射图像质量评价算法,并选用SLIC超像素算法对源图像分割。使用基本色域映射算法对源图像进行映射处理,并计算每个分块内各映射图像与源图像的相似度。根据每个图像分块的相似度,对基本色域映射图像进行选择综合处理并融合成最终图像。最后以LED显示屏和LCD显示器为例,对本文提出的算法和其他基本色域映射算法进行主观评价对比实验。实验结果证明本文算法在图像颜色保真效果上要明显优于其他算法,但是在计算速度上仍有待优化。 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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数字电视显示器的宽色域技术是显示领域的发展方向.近年来,宽色域显示器件和显示方式有长足进步,以发光二极管为背光源的液晶显示器等已商品化.采用三维色域测量方法,可以比传统测量方法更加准确地衡量产品的色域.提出了利用显示器宽色域色块校准方法,解决三维色域测量的准确性问题. 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
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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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为了拓宽LCD的色域,提出了在背光系统中添加基于TiO2-Ag-TiO2-Ag-Glass膜层结构的滤波器来优化背光源光谱。所提出的滤波器在可见光范围内可以仅通过红、绿和蓝3种颜色的光,而反射其他颜色的光。利用TechWiz 1D软件模拟了滤波器对于LCD色域的影响。当所提出的滤波器分别与黄色荧光粉(pc-WLED)、新红粉(KSF-LED)以及量子点(QD)背光源相结合时,LCD的色域分别从72%提升至102.6%NTSC,从92.3%提升至113.8%NTSC,从104.3%提升至119.9%NTSC。当入射光的角度从0°增加到40°时,3种背光源的色域变化都很小。模拟结果表明基于金属-电介质-金属(MDM)膜层结构的滤波器拥有小的角度依赖性,因此对实现宽色域LCD,是一种非常有效的方法。但其光利用率很低,3种背光源的光效率分别为26.5%、35.4%以及40.7%。 相似文献
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Most of the color image enhancement algorithms are implemented in two stages: gray scale image enhancement, which finds the target intensity, and then gamut mapping of the original color coordinates to the target. Therefore, hue preserving gamut mapping is an essential and crucial step, which influences colorfulness. In conventional color mapping methods, color saturation is reduced after intensity modification, which deteriorates subjective image quality. In this paper, a new color enhancement algorithm resulting in high color saturation is proposed. The proposed method employs multiplicative and additive color mapping to improve color saturation without clipping of a color component for increased target intensity as well as decreased cases. This new scheme is fast and effective, therefore, it can be employed to real time applications such as video signal processing. 相似文献