基于非局部均值的多尺度色调映射

针对高动态范围图像在传统输出设备上的显示问题，给出一个基于非局部均值滤波的多尺度色调映射算法。该算法使用非局部均值滤波对高动态范围图像进行粗化，将图像分解为一个包含大尺度变化的基本层和多个具有小尺度特征的细节层，对基本层和细节层分别进行调整，进行色彩还原。实验结果表明，与双边滤波等算法相比，该算法在较好还原真实场景的同时，不仅避免了光晕现象，也保留更丰富的细节信息。

Multi-scale tone mapping using non-local means filter

To display a high dynamic range image in traditional output devices, a multi-scale tone mapping approach using non-local means filter is presented. The proposed approach produces a series of coarsening images. The original image is decomposed into a base layer, containing larger scale variations in intensity, and some detail layers capturing the smaller scale details. The base layer and detail layer are dealt with different strategies respectively and followed by a restoration of color information. The experimental results demonstrate the performance of the proposed method. Compared with some related approaches, this algorithm can not only avoid halo artifacts, but also preserve more details efficiently while reproducing color information in visual point of view.