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Estimation of few light sources from environment maps for fast realistic rendering

In recent times, images of real world are being widely used for seamless integration of virtual objects into real world scenes. Images of real world, commonly know as environment maps, acts as source of natural lighting i.e. are used as representation of distant illumination at a point. In Image Based Lighting (IBL) technique each pixel of a high dynamic range image (HDRI) is used as a source of real world illumination. Although the method produces realistic rendering results but requires high computation time. One way to fasten rendering process is to use few light sources instead of thousands of light sources in HDRI (environment map). In this paper we present a method to estimate few light samples from environment map that closely mimics the actual natural lighting of a real world. The estimated light parameters could be used in interactive and augmented reality applications, where computation time is a vital factor.