一种基于图像色貌模型和分层模型的色调映射算法
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肖进胜(1975-),男,湖北武汉人,博士,副教授, 硕士生导师,主要研究领域为视频图像处理.

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国家自然科学基金(91120002,61201442)资助项目 (1.武汉大学 电子信息学院,湖北 武汉 430072; 2.中国工商银行 软件开发中心杭州研发支持部,浙江 杭州 310000)


A tone mapping algorithm based on image color appearance model and hierarchical model
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    摘要:

    针对目前高动态范围(HDR,high dynamic range) 图像色调映射算法存在效率低、效果欠佳的问题,提出了一 种基于色貌模型和分层模型的色调映射算法。首先,通过将高斯核离散化的方法加快双边滤 波;其次,在RGB 空间阶调压缩解决偏色问题;最后,对Stevens效应下的细节层增强效果进行调 整并对色彩饱和度增强,使映射 后的图像细节丰富,更加逼真。对比经典算法,不同场景的大量实验结果显示,主观质量和客 观指标均有所提高,与原始算法相比,本算法计算效 率提高了6倍以上,图像的熵平均提高0.046,清晰度平均提高0.159,边缘保持度平均提高 1.811。在主观效果上,减 少了偏色和光晕等现象,同时细节表现更清晰,色彩更丰富自然,分析表明,本文提出的色调 映射算法在高效、高视觉质量显示方面具有明显的优势,可用于高级图像编辑、显示设备开 发领域。

    Abstract:

    In view of that the present high dynamic range (HDR) image′s tone mapp ing algorithms are in low efficiency and poor effect,a tone mapping algorithm based on color appearance m odel and hierarchical model is proposed in this paper.Firstly,the bilateral filter is speeded up by using dis crete Gaussian kernel.Secondly,to solve the color cast problem,the tone compression is processed in RG B color spa ce instead of HPE color space. Finally,the detail layer′s effect is adjusted in the Stevens effect.In ad diti on,the color saturation is enhanced for presenting more details and more real appearance in the image after t one mapping.Com pared with classical algorithms,plenty of experimental results show that the algorithm proposed in t his paper performs best in terms of visual quality and objective indicators.Compared with the original algorithm ,it improves the efficiency by more than 6times,the image entropy by an average of 0.046,the image definitio n by an average of 0.159and the edge keeping degree by an average of 1.811.Subjectively,it reduces the color cas t and halos.The details appear more clearly and the color is more rich and natural as well.The analysis indicates t hat the tone mapping algorithm proposed in this paper has obvious advantages in high efficiency and high visual quality display.It can be used for advanced image editing and display equipment development.

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肖进胜,李佩,易本顺,白佳乐,贾茜.一种基于图像色貌模型和分层模型的色调映射算法[J].光电子激光,2013,(4):812~819

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  • 收稿日期:2012-08-29
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