Abstract
High Dynamic Range (HDR) imaging has been deployed in many multimedia devices recently. Various tone mapping operators (TMOs) have been developed which transform HDR radiance to the display devices. The objective of this study is to develop reference images for subjective evaluation of TMOs and full reference image quality metrics. For this purpose two psychophysical experiments were conducted. In the first experiment, high quality reference images were obtained containing the right features of colourfulness, sharpness and contrast. The reference images were used to evaluate the TMOs in subjective and objective assessments. In the second experiment, five popular TMOs were evaluated subjectively. It was found that Reinhard’s photographic tone reproduction based local TMO performed best among the five TMOs. Three full reference image quality metrics SSIM, CIELAB (2:1) and S-CIELAB were used to evaluate structural similarity and colour image quality of those TMOs. Their results showed that the three metrics agreed well with the visual results.
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