Pseudo-Multiple-Exposure-based Tone Fusion and Visual-Salience-based Tone Mapping for High Dynamic Range Images: A Review

Abstract

This paper presents an introduction to novel saliency-aware weighting and edge-aware weighting for HDR images. These techniques are incorporated into an existing guided image filter to form a perceptually guided image filter. The saliencyaware weighting and the new filter are applied to design a new local tone-mapping algorithm for HDR images such that both extreme light and shadow regions can be reproduced on conventional low dynamic range displays. The VisualSalience-Based Tone Mapping (VSBTM) filter preserves sharp edges in the base layer better than the existing guided filter. Halo artifacts are thus significantly reduced in the tonemapped image. Moreover, the visual quality of the tonemapped image, especially attention-salient regions, is improved by the saliency-aware weighting. Pseudo-MultipleExposure-Based Tone Fusion (PMEBTF) gives a regionbased enhancement on the pseudo-exposures to boost details in the most distinct region. Thereby the region-enhanced pseudo-exposures are fused into an HDR image. The fused image thus enhances details in the bright region of the dark image and the dark region of the bright image.