Abstract
Tone mapping methods aim to display a high dynamic range (HDR) image on a common 8-bit liquid crystal display by compressing its dynamic range. Both color rendering and contrast are two important issues in the development of tone mapping methods. In this paper, we propose a variational method to generate low dynamic range (LDR) images by using localized Gamma correction for HDR images to deal with color rendering and contrast issues. Our idea is to employ a weight map that controls localized Gamma correction in each pixel, and the weights are determined by minimizing the differences between the contrast of the original HRD image and that of the LDR image at nearby pixels. By imposing the regularization of the weight map, the total variational term for the weights is incorporated in the objective function for Gamma correction process. Numerical results based on widely-used HDR images are reported to illustrate the effectiveness of the proposed method and the visibility of the details in tone mapped images compared with the other testing methods.
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