【摘要】 颜色传递在图像处理领域一直备受关注,传统的颜色传递方法往往存在细节保持能力不足、层次感欠缺和视觉效果不佳等问题。针对上述问题,本文提出了一种结合图像签名和最优传输的局部颜色传递新方法。首先,引入基于图像签名的显著区域检测方法,得到参考图像和内容图像的前景区域和背景区域,然后在对应区域进行颜色传递以提高结果图像的层次感。其次,在传统线性颜色传递模型的基础上,结合最优传输理论提出了一种保持内容图像亮度的颜色传递策略,以较好地提升结果图像的质量。最后,为了更好地评估颜色传递效果,结合色度差和结构相似度设计了一种新的颜色传递客观评价指标。实验结果表明,相比于传统的颜色传递方法,文中所提方法得到的结果图像能够较好地保持内容图像的细节信息和层次感,并且具有更佳的视觉效果(新方法综合效果较传统方法提升了约30%)。另外,相对于传统的颜色传递评价指标而言,文中所提客观评价指标更加忠实于用户的主观评价结果。实验分析表明,与传统颜色传递方法相比,文中所提方法得到的结果图像在细节保持、层次感保持以及视觉效果上均有更佳表现,而且文中所提客观评价指标更为贴近主观评价结果。更多还原

【Abstract】 Color transfer has always attracted much attention in the field of image processing,but the traditional color transfer methods often have problems such as insufficient detail retention,lack of layering,and poor visual effects.To solve the above problems,this paper proposes a new method of local color transfer combining image signature and optimal transmission.Firstly,a salient region detection method based on image signature is introduced to obtain the foreground region and background region of the reference image and the content image,and then color transfer is performed in the corresponding region to improve the layering of the result image.Secondly,on the basis of the traditional linear color transfer model,combined with the optimal transmission theory,a color transfer strategy that maintains the brightness of the content image is proposed to improve the quality of the resulting image well.Finally,in order to evaluate the effect of color transfer more accurately,a new objective evaluation index of color transfer is designed in combination with chromaticity difference and structural similarity.The experimental results show that compared with the traditional color transfer method,the result image obtained by the method proposed in this paper preferably maintains the detailed information and layering of the content image,and has a more admirable visual effect(the comprehensive effect of the new method is about 30% higher than that of the traditional method).In addition,compared with the traditional color transfer evaluation index,the objective evaluation index mentioned in the article is more faithful to the users subjective evaluation result.Experimental analysis shows that compared with the traditional color transfer method,the result image obtained by the method in this paper has more outstanding performance in detail preservation,layering preservation and visual effects,and the objective evaluation index mentioned in the paper is closer to the result of subjective evaluation.更多还原