基于细节再现的高动态范围图像分层映射算法

Detail-preserving hierarchical tone-mapping algorithm for high dynamic range images

针对当前映射算法中亮度的映射函数非适性而引起对比度过度压缩的问题,以及映射时亮度变化改变图像细节可见性的问题,提出了一种基于细节再现的高动态范围(HDR)图像分层映射算法。该算法采用视觉响应曲线作为基础层的映射函数,根据图像局部适应性亮度动态地映射亮度;同时,在Stevens效应的思想基础上依据映射前后亮度变化获得补偿系数,拉伸或压缩细节层。测试结果表明:该映射算法所得图像能正确再现更多的可见细节。

Due to problems of over-compression by a non-adaptive mapping function,and changes of perceived contrasts for luminance shift during mapping,a hierarchical tone-mapping algorithm for detail-preserving was proposed.In this algorithm,the luminance-response curve adapting to each local luminance in High Dynamic Range （HDR） images,as a mapping function,was used to map luminances of the base layer.Then,compensation coefficients of the detail layer,for stretching or compressing details,were computed according to values of luminance shift based on Stevens＇ effect.The experimental results show that the proposed algorithm has good performance on preserving perceived details.