Abstract
This paper presents a novel method to synthesise a high dynamic range (HDR) spherical radiance map (RM) from a single low dynamic range (LDR) legacy photograph of an outdoor scene. The synthesised HDR RM is then used for real-time image based lighting (IBL) to render 3D virtual objects with plausible illumination matching with the background outdoor scene. Seam Carving (SC) is utilised to extend the legacy photograph to a panoramic image having a wider field of view for both backdrop and RM. Since SC is a content-aware image resizing technique, it effectively preserves important details such as shape and location of the sun in the outdoor scene and minimises distortion while expanding. The boundary of the 360-degree panoramic image used as RM is refined to minimise the seam. The extended LDR RM is then converted into a HDR RM using our novel inverse tone mapping (ITM) that provides fine tuning to simulate sunlight fall-off for sunny outdoor scenes. The synthesised HDR RM provides believable real-world lighting for IBL. With the combination of extended backdrop and real-time IBL, our pipeline can provide a potential solution for augmented reality (AR) rendering via head mounted displays (HMDs), only from a single legacy photograph.
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