10 February 2009 Exploring eye movements for tone mapped images
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In the real world we can find large intensity ranges: the ratio from the brightest to the darkest part of the scene can be of the order of 10000 to 1. Since most of our electronic displays have a limited range of around 100 to 1, the last 20 years has seen much work done to develop different algorithms that compress the actual dynamic range of an image to that available in the display device. These algorithms, known as tone mappers, attempt to preserve as much of the images characteristics as possible [1]. An increasing amount of research has also been done to try to evaluate the 'best' tone mapper. Approaches have included pair wise comparisons of tone mapped images [2], comparison with real scenes [3] or using images displayed on a High Dynamic Range (HDR) monitor [4]. None of these approaches are entirely satisfactory and all suffer from potential confounding factors due to participant's interpretation of instructions and biases. There is evidence that the spatial and chronological path of fixations made by observers' when viewing an image (i.e. the scanpath) is repeated to some extent when the same image is again presented to the observer (e.g. [5]). In this paper we are the first to investigate the potential of using eye movement recordings, particularly scanpaths, as a discriminatory tool. We propose that if a tone-mapped image gives rise to scanpaths that are different from those obtained when viewing the original image this might be an indication of a poor quality tone mapper since it is eliciting eye movements that are different from those observed when viewing the original image.
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Marina Bloj, Marina Bloj, Glen Harding, Glen Harding, Alan Chalmers, Alan Chalmers, } "Exploring eye movements for tone mapped images", Proc. SPIE 7240, Human Vision and Electronic Imaging XIV, 72400O (10 February 2009); doi: 10.1117/12.810497; https://doi.org/10.1117/12.810497

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