自适应分区的色调映射算法  

Tone mapping algorithm based on adaptive regionalization

作　　者：罗雪梅[1] 曾平[1,2] 郑海红[1] 谢琨[1] 

机构地区：[1]西安电子科技大学计算机学院,陕西西安710071 [2]西安石油大学计算机学院,陕西西安710065

出　　处：《华中科技大学学报（自然科学版）》2012年第11期93-96,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家部委基金资助项目(513160702);国家自然科学基金资助项目(J0500100306;61173025);国家部委预研基金资助项目(9140A16050109DZ01)

摘　　要：针对HDR图像色调再生提出了一种自适应分区映射算法.首先将HDR图像的色度和亮度信息分离,根据直方图特征对亮度进行自适应分区,并构造分段线性色调调整函数,将显示亮度范围分别分配给不同的亮度分区,以增加再现图像的感知对比度;然后通过双边滤波技术提取图像细节进行补偿,保证了再现图像细节可见;最后将彩色和非彩色信息合成,并对亮度压缩带来的彩度损失进行色彩校正.实验表明:新算法在动态范围压缩、细节保持和颜色表现上均优于传统算法.A tone mapping algorithm based on adaptive regionalization was presented for high dynamic range （HDR） image reproduction. Firstly, the chrominance and luminance of the HDR image were separated, the luminance was regionalized adaptively according to the histogram characteristic, and a piecewise linear tone scale function was constructed to allocate the range of display luminance for dif ferent regions, which raised perceptual contrast of the image. Then the details of the image was ex- tracted through bilateral filtering technology, which maintained details of the original image. Finally, the chromatic and achromatic image was fused, and the lose of chromaticity resulted from luminance compressing was corrected. Experiments show that the proposed algorithm gains advantages over the traditional ones in dynamic range compressing, details maintaining, and the performance of color.

关 键 词：高动态范围图像 色调映射 自适应分区 细节补偿 色彩校正 

分 类 号：TP334.4[自动化与计算机技术—计算机系统结构]