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A. Chalmers, J.P. Lewis, P. Hillman, C. Tait, T. Rhee, "Sky Browser: Search for HDR Sky Maps", Proc. of Pacific Graphics 2014, Seoul Korea, Oct, 2014.

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In a visual effects studio for movie production, sky maps play an important role for acting as a sky backdrop to a scene. The backdrop to a scene is often represented using a high-resolution sky map. This motivates the need for a large collection of sky maps to match various moods and lighting conditions. A comprehensive collection of images is not useful however, without a method of searching for desired images within that database. In this paper we define a feature space that supports an interactive search function for HDR sky maps, allowing users to find ideal images based on its appearance. The set of features are automatically extracted from the sky maps in an offline pre-processing step, and are queried in real time for progressive browsing. The system uses unsupervised learning techniques, discarding the need for labelling a large set of existing sky maps.


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A. Chalmers, J. Choi, T. Rhee, "Perceptually Optimised Illumination for Seamless Composites", Proc. of Pacific Graphics 2014, Seoul Korea, Oct, 2014.

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Composition with a photograph: the synthetic objects (blue ball, green block, bunny, and teapot) are illuminated by a radiance map (RM). From left: photograph, rendering with 5024x2512 HDR RM, and two examples of rendering with 320x160 LDR RM having expanded dynamic range using inverse tone mapping. The 2nd and 3rd images are visually equivalent, despite the large difference in RM resolution and dynamic range.


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A. Chalmers, J. Choi and T. Rhee, “Perceptually Based Radiance Map for Realistic Composition”, Proc. of 28th International Conference on Image and Vision Computing New Zealand (IVCNZ 2013), Wellington, NZ, Nov, 2013.


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The blue billiard ball and green block are synthetic objects, the rest of the scene is a photograph of real objects. This shows an optimised solution while maintaining realism. 

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